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Furusawa T, Cavero R, Liu Y, Li H, Xu X, Andresson T, Reinhold W, White O, Boufraqech M, Meyer TJ, Hartmann O, Diefenbacher ME, Pommier Y, Weyemi U. Metabolism-focused CRISPR screen unveils mitochondrial pyruvate carrier 1 as a critical driver for PARP inhibitor resistance in lung cancer. Mol Carcinog 2024; 63:1024-1037. [PMID: 38411275 PMCID: PMC11096028 DOI: 10.1002/mc.23705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 02/02/2024] [Accepted: 02/03/2024] [Indexed: 02/28/2024]
Abstract
Homologous recombination (HR) and poly ADP-ribosylation are partially redundant pathways for the repair of DNA damage in normal and cancer cells. In cell lines that are deficient in HR, inhibition of poly (ADP-ribose) polymerase (poly (ADP-ribose) polymerase [PARP]1/2) is a proven target with several PARP inhibitors (PARPis) currently in clinical use. Resistance to PARPi often develops, usually involving genetic alterations in DNA repair signaling cascades, but also metabolic rewiring particularly in HR-proficient cells. We surmised that alterations in metabolic pathways by cancer drugs such as Olaparib might be involved in the development of resistance to drug therapy. To test this hypothesis, we conducted a metabolism-focused clustered regularly interspaced short palindromic repeats knockout screen to identify genes that undergo alterations during the treatment of tumor cells with PARPis. Of about 3000 genes in the screen, our data revealed that mitochondrial pyruvate carrier 1 (MPC1) is an essential factor in desensitizing nonsmall cell lung cancer (NSCLC) lung cancer lines to PARP inhibition. In contrast to NSCLC lung cancer cells, triple-negative breast cancer cells do not exhibit such desensitization following MPC1 loss and reprogram the tricarboxylic acid cycle and oxidative phosphorylation pathways to overcome PARPi treatment. Our findings unveil a previously unknown synergistic response between MPC1 loss and PARP inhibition in lung cancer cells.
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Affiliation(s)
- Takashi Furusawa
- Developmental Therapeutics Branch, NCI Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States
| | - Renzo Cavero
- Developmental Therapeutics Branch, NCI Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States
| | - Yue Liu
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, USA
| | - Haojian Li
- Developmental Therapeutics Branch, NCI Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, USA
| | - Xia Xu
- Protein Characterization Laboratory, Frederick National Laboratory for Cancer Research, Cancer Research Technology Program, Leidos Biomedical Research Inc., Frederick, Maryland, USA
| | - Thorkell Andresson
- Protein Characterization Laboratory, Frederick National Laboratory for Cancer Research, Cancer Research Technology Program, Leidos Biomedical Research Inc., Frederick, Maryland, USA
| | - William Reinhold
- Developmental Therapeutics Branch, NCI Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States
| | - Olivia White
- Surgical Oncology Program, NCI Center for Cancer Research, NCI, NIH., Bethesda, Maryland, United States
| | - Myriem Boufraqech
- Surgical Oncology Program, NCI Center for Cancer Research, NCI, NIH., Bethesda, Maryland, United States
| | - Thomas J. Meyer
- CCR Collaborative Bioinformatics Resource (CCBR), Leidos Biomedical Research Inc., Frederick, Maryland, USA
| | - Oliver Hartmann
- Institute of Lung Health and Immunity, Helmholtz Center, Munich, Germany
- German Center for Lung Research, DZL, Giessen, Germany
- Helmholtz Center Munich, Munich, Germany
| | - Markus E. Diefenbacher
- Institute of Lung Health and Immunity, Helmholtz Center, Munich, Germany
- German Center for Lung Research, DZL, Giessen, Germany
- Helmholtz Center Munich, Munich, Germany
| | - Yves Pommier
- Developmental Therapeutics Branch, NCI Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States
| | - Urbain Weyemi
- Developmental Therapeutics Branch, NCI Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States
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Song Y, Ren S, Chen X, Li X, Chen L, Zhao S, Zhang Y, Shen X, Chen Y. Inhibition of MFN1 restores tamoxifen-induced apoptosis in resistant cells by disrupting aberrant mitochondrial fusion dynamics. Cancer Lett 2024; 590:216847. [PMID: 38583647 DOI: 10.1016/j.canlet.2024.216847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 03/18/2024] [Accepted: 03/31/2024] [Indexed: 04/09/2024]
Abstract
Tamoxifen (TAM) resistance presents a major clinical obstacle in the management of estrogen-sensitive breast cancer, highlighting the need to understand the underlying mechanisms and potential therapeutic approaches. We showed that dysregulated mitochondrial dynamics were involved in TAM resistance by protecting against mitochondrial apoptosis. The dysregulated mitochondrial dynamics were associated with increased mitochondrial fusion and decreased fission, thus preventing the release of mitochondrial cytochrome c to the cytoplasm following TAM treatment. Dynamin-related GTPase protein mitofusin 1 (MFN1), which promotes fusion, was upregulated in TAM-resistant cells, and high MFN1 expression indicated a poor prognosis in TAM-treated patients. Mitochondrial translocation of MFN1 and interaction between MFN1 and mitofusin 2 (MFN2) were enhanced to promote mitochondrial outer membrane fusion. The interaction of MFN1 and cristae-shaping protein optic atrophy 1 (OPA1) and OPA1 oligomerization were reduced due to augmented OPA1 proteolytic cleavage, and their apoptosis-promoting function was reduced due to cristae remodeling. Furthermore, the interaction of MFN1 and BAK were increased, which restrained BAK activation following TAM treatment. Knockdown or pharmacological inhibition of MFN1 blocked mitochondrial fusion, restored BAK oligomerization and cytochrome c release, and amplified activation of caspase-3/9, thus sensitizing resistant cells to apoptosis and facilitating the therapeutic effects of TAM both in vivo and in vitro. Conversely, overexpression of MFN1 alleviated TAM-induced mitochondrial apoptosis and promoted TAM resistance in sensitive cells. These results revealed that dysregulated mitochondrial dynamics contributes to the development of TAM resistance, suggesting that targeting MFN1-mediated mitochondrial fusion is a promising strategy to circumvent TAM resistance.
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Affiliation(s)
- Yuxuan Song
- The State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The High Efficacy Application of Natural Medicinal Resources Engineering Center of Guizhou Province, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The Key Laboratory of Optimal Utilization of Natural Medicine Resources, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; Key Laboratory of Novel Anti-Cancer Drug Targets Discovery and Application, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China
| | - Shuang Ren
- The State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The High Efficacy Application of Natural Medicinal Resources Engineering Center of Guizhou Province, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The Key Laboratory of Optimal Utilization of Natural Medicine Resources, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; Key Laboratory of Novel Anti-Cancer Drug Targets Discovery and Application, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China
| | - Xingmei Chen
- The State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The High Efficacy Application of Natural Medicinal Resources Engineering Center of Guizhou Province, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The Key Laboratory of Optimal Utilization of Natural Medicine Resources, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; Key Laboratory of Novel Anti-Cancer Drug Targets Discovery and Application, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China
| | - Xuhong Li
- The State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The High Efficacy Application of Natural Medicinal Resources Engineering Center of Guizhou Province, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The Key Laboratory of Optimal Utilization of Natural Medicine Resources, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China
| | - Lin Chen
- The State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The High Efficacy Application of Natural Medicinal Resources Engineering Center of Guizhou Province, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The Key Laboratory of Optimal Utilization of Natural Medicine Resources, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China
| | - Shijie Zhao
- The State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The High Efficacy Application of Natural Medicinal Resources Engineering Center of Guizhou Province, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The Key Laboratory of Optimal Utilization of Natural Medicine Resources, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China
| | - Yue Zhang
- The State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The High Efficacy Application of Natural Medicinal Resources Engineering Center of Guizhou Province, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The Key Laboratory of Optimal Utilization of Natural Medicine Resources, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China.
| | - Xiangchun Shen
- The State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The High Efficacy Application of Natural Medicinal Resources Engineering Center of Guizhou Province, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The Key Laboratory of Optimal Utilization of Natural Medicine Resources, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China.
| | - Yan Chen
- The State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The High Efficacy Application of Natural Medicinal Resources Engineering Center of Guizhou Province, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; The Key Laboratory of Optimal Utilization of Natural Medicine Resources, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China; Key Laboratory of Novel Anti-Cancer Drug Targets Discovery and Application, School of Pharmaceutical Sciences, Guizhou Medical University, No.6 Ankang Avenue, Guian New District, Guizhou 561113, China.
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Jing J, Zhang C, Du S, Tan X, Yue X, Qiao D. Sudden death with cardiac involvement in a neonate with carnitine-acylcarnitine translocase deficiency. Cardiovasc Pathol 2024; 70:107630. [PMID: 38490313 DOI: 10.1016/j.carpath.2024.107630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 02/22/2024] [Accepted: 03/05/2024] [Indexed: 03/17/2024] Open
Abstract
A female neonate born with normal Apgar scores at 38+2 weeks of gestational age unexpectedly passed away within less than 30 hours after birth. The situation mirrored her brother's earlier demise within 24 hours post-delivery, suggesting a possible genetic disorder. Gross examination revealed widespread cyanosis and distinct yellowish changes on the cardiac ventricles. Histopathological examination disclosed lipid accumulation in the liver, heart, and kidneys. Tandem mass spectrometry detected elevated levels of 10 amino acids and 14 carnitines in cardiac blood. Trio-whole genome sequencing (Trio-WGS) identified the SLC25A20 c.199-10T>G mutation associated with carnitine-acylcarnitine translocase disease (CACTD), a type of fatty acid oxidation disorders (FAODs) with a potential for sudden death. Further validation of gene expression confirmed the functional deficiency of SLC25A20, ultimately diagnosing CACTD as the underlying cause of the neonate's demise. This case highlights the importance of prenatal metabolic and genetic screening for prospective parents and emphasizes the need for forensic doctors to integrate metabolomic and genomic investigations into autopsies for suspected inherited metabolic diseases.
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Affiliation(s)
- Jiayu Jing
- School of Forensic Medicine, Southern Medical University, Guangzhou, China
| | - Cui Zhang
- School of Forensic Medicine, Southern Medical University, Guangzhou, China
| | - Sihao Du
- School of Forensic Medicine, Southern Medical University, Guangzhou, China
| | - Xiaohui Tan
- School of Forensic Medicine, Southern Medical University, Guangzhou, China
| | - Xia Yue
- School of Forensic Medicine, Southern Medical University, Guangzhou, China
| | - Dongfang Qiao
- School of Forensic Medicine, Southern Medical University, Guangzhou, China.
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Zhu X, Xu Y, Zhang J, Li X, He J, Jia C, Lyu S, Liu S, Gao Y, Ma K, Ouyang Y, Ren Y, Zhao D. [Newborn screening, clinical features and genetic analysis for Citrin deficiency in Henan province]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2024; 41:461-466. [PMID: 38565513 DOI: 10.3760/cma.j.cn511374-20230301-00103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
OBJECTIVE To explore the prevalence, clinical features, genetic characteristics and prognosis of Citrin deficiency in Henan province of China. METHODS A total of 986 565 neonates screened by tandem mass spectrometry at the Third Affiliated Hospital of Zhengzhou University from January 2013 to December 2021 were retrospectively analyzed. Analysis of SLC25A13 gene variants and parental verification were carried out for neonates suspected for Citrin deficiency by next-generation sequencing. The clinical, biochemical and genetic characteristics of Citrin deficiency patients were integrated to guide the diet treatment and follow up the growth and development. Paired-t test was used to compare the amino acid levels in the peripheral blood samples before and after the treatment. RESULTS Nine cases of Citrin deficiency were diagnosed among the 986 565 neonates. Specific elevation of citrulline was observed in all of the 9 cases. Six variants were detected by genetic sequencing, among which c.852_855delTATG, c.615+5G>A, c.550C>T and IVS16ins3kb were known pathogenic variants, whilst c.1111_1112delAT and c.837T>A were unreported previously. The detection rate for c. 852_855delTATG was the highest (61.6%, 11/18), followed by IVS16ins3kb (16.7%, 3/18). The clinical symptoms of all patients were relieved after the treatment, and the blood amino acid profile and biochemical parameters were significantly improved by gradually falling within the normal range. By June 2022, all patients had shown a good prognosis. CONCLUSION The prevalence of Citrin deficiency among neonates from Henan Province by tandem mass spectrometry is 1/109 618, and the carrier rate for the pathogenic variants of the SLC25A13 gene was 1/166. The c.852_855delTATG may be a hot spot variant among the patients. Discovery of the novel variants has enriched the mutational spectrum of the SLC25A13 gene. Above results have provided a basis for the early diagnosis, treatment, prognosis and genetic counseling for the affected families.
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Affiliation(s)
- Xinyun Zhu
- Department of Neonatal Screening, the Third Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China.
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Wu S, Zhang Y, Xu L, Zhang H, Li Y, Yang L, Zhang Z, Zhang H. Mitochondrial Outer Membrane Translocase MoTom20 Modulates Mitochondrial Morphology and Is Important for Infectious Growth of the Rice Blast Fungus Magnaporthe oryzae. Mol Plant Microbe Interact 2024; 37:407-415. [PMID: 38171376 DOI: 10.1094/mpmi-10-23-0168-r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Mitochondria are highly dynamic organelles that constantly change their morphology to adapt to the cellular environment through fission and fusion, which is critical for a cell to maintain normal cellular functions. Despite the significance of this process in the development and pathogenicity of the rice blast fungus Magnaporthe oryzae, the underlying mechanism remains largely elusive. Here, we identified and characterized a mitochondrial outer membrane translocase, MoTom20, in M. oryzae. Targeted gene deletion revealed that MoTom20 plays an important role in vegetative growth, conidiogenesis, penetration, and infectious growth of M. oryzae. The growth rate, conidial production, appressorium turgor, and pathogenicity are decreased in the ΔMotom20 mutant compared with the wild-type and complemented strains. Further analysis revealed that MoTom20 localizes in mitochondrion and plays a key role in regulating mitochondrial fission and fusion balance, which is critical for infectious growth. Finally, we found that MoTom20 is involved in fatty-acid utilization, and its yeast homolog ScTom20 is able to rescue the defects of ΔMotom20 in mitochondrial morphology and pathogenicity. Overall, our data demonstrate that MoTom20 is a key regulator for mitochondrial morphology maintenance, which is important for infectious growth of the rice blast fungus M. oryzae. [Formula: see text] Copyright © 2024 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Shuang Wu
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China
| | - Ying Zhang
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China
| | - Lele Xu
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China
| | - Haibo Zhang
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China
| | - Yuhe Li
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China
| | - Leiyun Yang
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China
| | - Zhengguang Zhang
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China
| | - Haifeng Zhang
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, China
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Busto JV, Ganesan I, Mathar H, Steiert C, Schneider EF, Straub SP, Ellenrieder L, Song J, Stiller SB, Lübbert P, Chatterjee R, Elsaesser J, Melchionda L, Schug C, den Brave F, Schulte U, Klecker T, Kraft C, Fakler B, Becker T, Wiedemann N. Role of the small protein Mco6 in the mitochondrial sorting and assembly machinery. Cell Rep 2024; 43:113805. [PMID: 38377000 DOI: 10.1016/j.celrep.2024.113805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 12/22/2023] [Accepted: 01/31/2024] [Indexed: 02/22/2024] Open
Abstract
The majority of mitochondrial precursor proteins are imported through the Tom40 β-barrel channel of the translocase of the outer membrane (TOM). The sorting and assembly machinery (SAM) is essential for β-barrel membrane protein insertion into the outer membrane and thus required for the assembly of the TOM complex. Here, we demonstrate that the α-helical outer membrane protein Mco6 co-assembles with the mitochondrial distribution and morphology protein Mdm10 as part of the SAM machinery. MCO6 and MDM10 display a negative genetic interaction, and a mco6-mdm10 yeast double mutant displays reduced levels of the TOM complex. Cells lacking Mco6 affect the levels of Mdm10 and show assembly defects of the TOM complex. Thus, this work uncovers a role of the SAMMco6 complex for the biogenesis of the mitochondrial outer membrane.
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Affiliation(s)
- Jon V Busto
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Iniyan Ganesan
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Hannah Mathar
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Conny Steiert
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Eva F Schneider
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Sebastian P Straub
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany; Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Lars Ellenrieder
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Jiyao Song
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Sebastian B Stiller
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Philipp Lübbert
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Ritwika Chatterjee
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Jana Elsaesser
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany; Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Laura Melchionda
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Christina Schug
- Institute of Cell Biology, University of Bayreuth, Bayreuth, Germany
| | - Fabian den Brave
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Uwe Schulte
- Institute of Physiology, Faculty of Medicine, University of Freiburg, Freiburg, Germany; CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| | - Till Klecker
- Institute of Cell Biology, University of Bayreuth, Bayreuth, Germany
| | - Claudine Kraft
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany; CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| | - Bernd Fakler
- Institute of Physiology, Faculty of Medicine, University of Freiburg, Freiburg, Germany; CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany; Center for Basics in NeuroModulation, Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| | - Thomas Becker
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany.
| | - Nils Wiedemann
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany; CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
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Yu FF, Yu SY, Sun L, Zuo J, Luo KT, Wang M, Fu XL, Zhang F, Huang H, Zhou GY, Wang YJ, Ba Y. T-2 toxin induces mitochondrial dysfunction in chondrocytes via the p53-cyclophilin D pathway. J Hazard Mater 2024; 465:133090. [PMID: 38039814 DOI: 10.1016/j.jhazmat.2023.133090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/14/2023] [Accepted: 11/23/2023] [Indexed: 12/03/2023]
Abstract
Kashin-Beck disease is an endemic joint disease characterized by deep chondrocyte necrosis, and T-2 toxin exposure has been confirmed its etiology. This study investigated mechanism of T-2 toxin inducing mitochondrial dysfunction of chondrocytes through p53-cyclophilin D (CypD) pathway. The p53 signaling pathway was significantly enriched in T-2 toxin response genes from GeneCards. We demonstrated the upregulation of the p53 protein and p53-CypD complex in rat articular cartilage and ATDC5 cells induced by T-2 toxin. Transmission electron microscopy showed the damaged mitochondrial structure of ATDC5 cells induced by T-2 toxin. Furthermore, it can lead to overopening of the mitochondrial permeability transition pore (mPTP), decreased mitochondrial membrane potential, and increased reactive oxygen species generation in ATDC5 cells. Pifithrin-α, the p53 inhibitor, alleviated the increased p53-CypD complex and mitochondrial dysfunction of chondrocytes induced by T-2 toxin, suggesting that p53 played an important role in T-2 toxin-induced mitochondrial dysfunction. Mechanistically, T-2 toxin can activate the p53 protein, which can be transferred to the mitochondrial membrane and form a complex with CypD. The increased binding of p53 and CypD mediated the excessive opening of mPTP, changed mitochondrial membrane permeability, and ultimately induced mitochondrial dysfunction and apoptosis of chondrocytes.
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Affiliation(s)
- Fang-Fang Yu
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Shui-Yuan Yu
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Lei Sun
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Juan Zuo
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Kang-Ting Luo
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Miao Wang
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Xiao-Li Fu
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Feng Zhang
- Institute of Endemic Diseases, School of Public Health of Health Science Center, Xi'an Jiaotong University, Xi'an 710061, China
| | - Hui Huang
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Guo-Yu Zhou
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Yan-Jie Wang
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Yue Ba
- School of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China.
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Mi D, Yanatori I, Zheng H, Kong Y, Hirayama T, Toyokuni S. Association of poly( rC)-binding protein-2 with sideroflexin-3 through TOM20 as an iron entry pathway to mitochondria. Free Radic Res 2024; 58:261-275. [PMID: 38599240 DOI: 10.1080/10715762.2024.2340711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 03/15/2024] [Indexed: 04/12/2024]
Abstract
Iron is essential for all the lives and mitochondria integrate iron into heme and Fe-S clusters for diverse use as cofactors. Here, we screened mitochondrial proteins in KU812 human chronic myelogenous leukemia cells by glutathione S-transferase pulldown assay with PCBP2 to identify mitochondrial receptors for PCBP2, a major cytosolic Fe(II) chaperone. LC-MS analyses identified TOM20, sideroflexin-3 (SFXN3), SFXN1 and TOM70 in the affinity-score sequence. Stimulated emission depletion microscopy and proteinase-K digestion of mitochondria in HeLa cells revealed that TOM20 is located in the outer membrane of mitochondria whereas SFXN3 is located in the inner membrane. Although direct association was not observed between PCBP2 and SFXN3 with co-immunoprecipitation, proximity ligation assay demonstrated proximal localization of PCBP2 with TOM20 and there was a direct binding between TOM20 and SFXN3. Single knockdown either of PCBP2 and SFXN3 in K562 leukemia cells significantly decreased mitochondrial catalytic Fe(II) and mitochondrial maximal respiration. SFXN3 but not MFRN1 knockout (KO) in mouse embryonic fibroblasts decreased FBXL5 and heme oxygenase-1 (HO-1) but increased transferrin uptake and induced ferritin, indicating that mitochondrial iron entry through SFXN3 is distinct. MFRN1 KO revealed more intense mitochondrial Fe(II) deficiency than SFXN3 KO. Insufficient mitochondrial heme synthesis was evident under iron overload both with SFXN3 and MFRN KO, which was partially reversed by HO-1 inhibitor. Conversely, SFXN3 overexpression caused cytosolic iron deficiency with mitochondrial excess Fe(II), which further sensitized HeLa cells to RSL3-induced ferroptosis. In conclusion, we discovered a novel pathway of iron entry into mitochondria from cytosol through PCBP2-TOM20-SFXN3 axis.
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Affiliation(s)
- Danyang Mi
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Izumi Yanatori
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
- Department of Molecular and Cellular Physiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hao Zheng
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yingyi Kong
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Tasuku Hirayama
- Laboratory of Pharmaceutical and Medicinal Chemistry, Gifu Pharmaceutical University, Gifu, Japan
| | - Shinya Toyokuni
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
- Center for Low-temperature Plasma Sciences, Nagoya University, Nagoya, Japan
- Center for Integrated Sciences of Low-temperature Plasma Core Research (iPlasma Core), Tokai National Higher Education and Research System, Nagoya, Japan
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Bilgin H, Bilge S, Binici M, Tekes S. Clinical, biochemical, and genotypical characteristics in urea cycle mitochondrial transporter disorders. Eur Rev Med Pharmacol Sci 2024; 28:1873-1880. [PMID: 38497870 DOI: 10.26355/eurrev_202403_35601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
BACKGROUND This study aimed to evaluate clinical, biochemical, and genotypic findings of patients diagnosed with urea cycle mitochondrial transporter disorders. CASE SERIES In this study, patients followed up with the diagnosis of urea cycle mitochondrial transporter disorders in the pediatric metabolism outpatient clinic of Diyarbakir Children's Hospital were retrospectively examined. Height, weight, head circumference, gender, age at diagnosis, follow-up period, consanguinity history between parents, and treatments of the patients included in the study were evaluated. Eight patients suffering from urea cycle mitochondrial transporter disorders were enrolled in the study. Five patients were found to have biallelic variants of the SLC25A15 gene. Two patients were found to have biallelic variants of the SLC25A13 gene. Two of our patients presented with gait disturbances and were diagnosed with HHH syndrome. One patient presented with liver failure and was diagnosed with HHH syndrome. The other three patients were identified by family screening. Citrin deficiency was detected in two patients with cholestasis and hepatomegaly in the infantile period. Ornithine levels increased in three of our patients with HHH syndrome during the first month of treatment despite a protein-restricted diet and adequate caloric intake. CONCLUSIONS Increasing patients' caloric intake with HHH syndrome improves their ornithine levels. Our patients with citrin deficiency recovered clinically and biochemically before seven months.
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Affiliation(s)
- H Bilgin
- Department of Pediatrics, Division of Metabolism, Diyarbakir Children's Hospital, Diyarbakir, Turkey.
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10
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Shi X, DeCiucis M, Grabinska KA, Kanyo J, Liu A, Lam TT, Shen H. Dual regulation of SLC25A39 by AFG3L2 and iron controls mitochondrial glutathione homeostasis. Mol Cell 2024; 84:802-810.e6. [PMID: 38157846 PMCID: PMC10922821 DOI: 10.1016/j.molcel.2023.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 12/02/2023] [Accepted: 12/08/2023] [Indexed: 01/03/2024]
Abstract
Organelle transporters define metabolic compartmentalization, and how this metabolite transport process can be modulated is poorly explored. Here, we discovered that human SLC25A39, a mitochondrial transporter critical for mitochondrial glutathione uptake, is a short-lived protein under dual regulation at the protein level. Co-immunoprecipitation mass spectrometry and CRISPR knockout (KO) in mammalian cells identified that mitochondrial m-AAA protease AFG3L2 is responsible for degrading SLC25A39 through the matrix loop 1. SLC25A39 senses mitochondrial iron-sulfur cluster using four matrix cysteine residues and inhibits its degradation. SLC25A39 protein regulation is robust in developing and mature neurons. This dual transporter regulation, by protein quality control and metabolic sensing, allows modulating mitochondrial glutathione level in response to iron homeostasis, opening avenues for exploring regulation of metabolic compartmentalization. Neuronal SLC25A39 regulation connects mitochondrial protein quality control, glutathione, and iron homeostasis, which were previously unrelated biochemical features in neurodegeneration.
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Affiliation(s)
- Xiaojian Shi
- Cellular and Molecular Physiology Department, Yale School of Medicine, New Haven, CT, USA; Systems Biology Institute, Yale West Campus, West Haven, CT, USA
| | - Marisa DeCiucis
- Cellular and Molecular Physiology Department, Yale School of Medicine, New Haven, CT, USA; Systems Biology Institute, Yale West Campus, West Haven, CT, USA
| | - Kariona A Grabinska
- Cellular and Molecular Physiology Department, Yale School of Medicine, New Haven, CT, USA; Systems Biology Institute, Yale West Campus, West Haven, CT, USA
| | - Jean Kanyo
- Keck MS & Proteomics Resource, Yale School of Medicine, New Haven, CT, USA
| | - Adam Liu
- Amity High School, Woodbridge, CT, USA
| | - Tukiet T Lam
- Keck MS & Proteomics Resource, Yale School of Medicine, New Haven, CT, USA; Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, USA
| | - Hongying Shen
- Cellular and Molecular Physiology Department, Yale School of Medicine, New Haven, CT, USA; Systems Biology Institute, Yale West Campus, West Haven, CT, USA.
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11
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Inui A, Ko JS, Chongsrisawat V, Sibal A, Hardikar W, Chang MH, Treepongkaruna S, Arai K, Kim KM, Chen HL. Update on the diagnosis and management of neonatal intrahepatic cholestasis caused by citrin deficiency: Expert review on behalf of the Asian Pan-Pacific Society for Pediatric Gastroenterology, Hepatology, and Nutrition. J Pediatr Gastroenterol Nutr 2024; 78:178-187. [PMID: 38374571 DOI: 10.1002/jpn3.12042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 08/31/2023] [Accepted: 09/14/2023] [Indexed: 02/21/2024]
Abstract
Citrin deficiency is an autosomal recessive metabolic liver disease caused by mutations in the SLC25A13 gene. The disease typically presents with cholestasis, elevated liver enzymes, hyperammonemia, hypercitrullinemia, and fatty liver in young infants, resulting in a phenotype known as "neonatal intrahepatic cholestasis caused by citrin deficiency" (NICCD). The diagnosis relies on clinical manifestation, biochemical evidence of hypercitrullinemia, and identifying mutations in the SLC25A13 gene. Several common mutations have been found in patients of East Asian background. The mainstay treatment is nutritional therapy in early infancy utilizing a lactose-free and medium-chain triglyceride formula. This approach leads to the majority of patients recovering liver function by 1 year of age. Some patients may remain asymptomatic or undiagnosed, but a small proportion of cases can progress to cirrhosis and liver failure, necessitating liver transplantation. Recently, advancements in newborn screening methods have improved the age of diagnosis. Early diagnosis and timely management improve patient outcomes. Further studies are needed to elucidate the long-term follow-up of NICCD patients into adolescence and adulthood.
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Affiliation(s)
- Ayano Inui
- Department of Pediatric Hepatology and Gastroenterology, Saiseikai Yokohamshi Tobu Hospital, Yokohama, Japan
| | - Jae Sung Ko
- Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea
| | - Voranush Chongsrisawat
- Department of Pediatrics, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Bangkok, Thailand
| | | | - Winita Hardikar
- Department of Gastroenterology, Royal Children's Hospital, Melbourne, Australia
| | - Mei-Hwei Chang
- Department of Pediatrics, National Taiwan University College of Medicine and Children's Hospital, Taipei, Taiwan
| | - Suporn Treepongkaruna
- Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Katsuhiro Arai
- Division of Gastroenterology, National Center for Child Health and Development, Tokyo, Japan
| | - Kyung Mo Kim
- Department of Pediatrics, Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, Seoul, Korea
| | - Huey-Ling Chen
- Department of Pediatrics, National Taiwan University College of Medicine and Children's Hospital, Taipei, Taiwan
- Department and Graduate Institute of Medical Education and Bioethics, National Taiwan University College of Medicine and Hospital, Taipei, Taiwan
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Haastrup MO, Vikramdeo KS, Anand S, Khan MA, Carter JE, Singh S, Singh AP, Dasgupta S. Mitochondrial Translocase TOMM22 Is Overexpressed in Pancreatic Cancer and Promotes Aggressive Growth by Modulating Mitochondrial Protein Import and Function. Mol Cancer Res 2024; 22:197-208. [PMID: 37878010 DOI: 10.1158/1541-7786.mcr-23-0138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 09/08/2023] [Accepted: 10/23/2023] [Indexed: 10/26/2023]
Abstract
Pancreatic cancer has the worst prognosis among all cancers, underscoring the need for improved management strategies. Dysregulated mitochondrial function is a common feature in several malignancies, including pancreatic cancer. Although mitochondria have their own genome, most mitochondrial proteins are nuclear-encoded and imported by a multi-subunit translocase of the outer mitochondrial membrane (TOMM). TOMM22 is the central receptor of the TOMM complex and plays a role in complex assembly. Pathobiologic roles of TOMM subunits remain largely unexplored. Here we report that TOMM22 protein/mRNA is overexpressed in pancreatic cancer and inversely correlated with disease outcomes. TOMM22 silencing decreased, while its forced overexpression promoted the growth and malignant potential of the pancreatic cancer cells. Increased import of several mitochondrial proteins, including those associated with mitochondrial respiration, was observed upon TOMM22 overexpression which was associated with increased RCI activity, NAD+/NADH ratio, oxygen consumption rate, membrane potential, and ATP production. Inhibition of RCI activity decreased ATP levels and suppressed pancreatic cancer cell growth and malignant behavior confirming that increased TOMM22 expression mediated the phenotypic changes via its modulation of mitochondrial protein import and functions. Altogether, these results suggest that TOMM22 overexpression plays a significant role in pancreatic cancer pathobiology by altering mitochondrial protein import and functions. IMPLICATIONS TOMM22 bears potential for early diagnostic/prognostic biomarker development and therapeutic targeting for better management of patients with pancreatic cancer.
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Affiliation(s)
- Mary Oluwadamilola Haastrup
- Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Kunwar Somesh Vikramdeo
- Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Shashi Anand
- Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Mohammad Aslam Khan
- Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - James Elliot Carter
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama
| | - Seema Singh
- Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, Alabama
| | - Ajay Pratap Singh
- Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, Alabama
| | - Santanu Dasgupta
- Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, Alabama
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13
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Lin J, Lin W, Lin Y, Peng W, Zheng Z. Clinical and genetic analysis of 26 Chinese patients with neonatal intrahepatic cholestasis due to citrin deficiency. Clin Chim Acta 2024; 552:117617. [PMID: 37890575 DOI: 10.1016/j.cca.2023.117617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 10/24/2023] [Accepted: 10/24/2023] [Indexed: 10/29/2023]
Abstract
BACKGROUND Neonatal intrahepatic cholestasis due to citrin deficiency (NICCD) is an autosomal recessive disorder caused by SLC25A13 genetic mutations. We retrospectively analyzed 26 Chinese infants with NICCD (years 2014-2022) in Quanzhou City. METHODS The plasma citrulline (CIT) concentration analyzed by tandem mass spectrometry (MS/MS), biochemical parameters and molecular analysis results are presented. RESULTS Twelve genotypes were discovered. The relationship between the CIT concentration and genotype is uncertain. In total, 8 mutations were detected, with 4 variations, c.851_854delGTAT, c.615 + 5G > A, c.1638_1660dup and IVS16ins3kb, constituting the high-frequency mutations. Specifically, we demonstrated 2 patients with NICCD combined with another inborn errors of metabolism (IEM). Patient No. 22 possessed compound heterozygous mutations of c.615 + 5G > A and c.790G > A in the SLC25A13 gene accompanied by compound heterozygous variations of c.C259T and c.A155G in the PTS gene. Additionally, Patient No. 26 carried c.51C > G and c.760C > T in the SLC22A5 gene as well as c.615 + 5G > A and IVS16ins3kb in the SLC25A13 gene. CONCLUSIONS We report a case of the simultaneous occurrence of primary carnitine deficiency (PCD) and NICCD.
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Affiliation(s)
- Jiansheng Lin
- Neonatal Disease Screening Center, Quanzhou Maternity and Children's Hospital, 700 Fengze street, Quanzhou, Fujian Province 362000, China
| | - Weihua Lin
- Neonatal Disease Screening Center, Quanzhou Maternity and Children's Hospital, 700 Fengze street, Quanzhou, Fujian Province 362000, China
| | - Yiming Lin
- Neonatal Disease Screening Center, Quanzhou Maternity and Children's Hospital, 700 Fengze street, Quanzhou, Fujian Province 362000, China
| | - Weilin Peng
- Neonatal Disease Screening Center, Quanzhou Maternity and Children's Hospital, 700 Fengze street, Quanzhou, Fujian Province 362000, China.
| | - Zhenzhu Zheng
- Neonatal Disease Screening Center, Quanzhou Maternity and Children's Hospital, 700 Fengze street, Quanzhou, Fujian Province 362000, China.
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14
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Moitra A, Tiku V, Rapaport D. Yeast mitochondria can process de novo designed β-barrel proteins. FEBS J 2024; 291:292-307. [PMID: 37723586 DOI: 10.1111/febs.16950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 08/18/2023] [Accepted: 09/04/2023] [Indexed: 09/20/2023]
Abstract
Mitochondrial outer membrane β-barrel proteins are encoded in the nucleus, translated in the cytosol and then targeted to and imported into the respective organelles. Detailed studies have uncovered the mechanisms involved in the import of these proteins and identified the targeting signals and the cytosolic factors that govern their proper biogenesis. Recently, de novo designed eight-stranded β-barrel proteins (Tmb2.3 and Tmb2.17) were shown to fold and assemble into lipid membranes. To better understand the general aspects of the biogenesis of β-barrel proteins, we investigated the fate of these artificial proteins upon their expression in yeast cells. We demonstrate that although these proteins are de novo designed and are not related to bona fide mitochondrial β-barrel proteins, they were targeted to mitochondria and integrated into the organelle outer membrane. We further studied whether this integration requires components of the yeast mitochondrial import machinery like Tom20, Tom70, Tob55/Sam50 and Mas37/Sam37. Whereas it seems that none of the import receptors was required for the biogenesis of the artificial β-barrel proteins, we observed a strong dependency on the TOB/SAM complex. Collectively, our findings demonstrate that the mitochondrial outer membrane is the preferential location in yeast cells for any membrane-embedded β-barrel protein.
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Affiliation(s)
- Anasuya Moitra
- Interfaculty Institute of Biochemistry, University of Tuebingen, Tuebingen, Germany
| | - Vitasta Tiku
- Interfaculty Institute of Biochemistry, University of Tuebingen, Tuebingen, Germany
| | - Doron Rapaport
- Interfaculty Institute of Biochemistry, University of Tuebingen, Tuebingen, Germany
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15
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Jiang M, Peng M, Lu Z, Shao Y, Liu Z, Li X, Lin Y, Liu L, Zhang W, Cai Y. Features of liver injury in 138 Chinese patients with NICCD. J Pediatr Endocrinol Metab 2023; 36:1154-1160. [PMID: 37939726 DOI: 10.1515/jpem-2023-0026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 10/16/2023] [Indexed: 11/10/2023]
Abstract
OBJECTIVES To find biochemical and molecular markers can assist in identifying serious liver damage of neonatal intrahepatic cholestasis caused by citrin deficiency (NICCD) patients. METHODS 138 patients under 13 days to 1.1 year old diagnosed of NICCD in our center from 2004 to 2020. Base on the abnormal liver laboratory tests, we divided 138 patients into three groups: acute liver failure (ALF), liver dysfunction, and non-liver dysfunction groups, then compared their clinical, biochemical and, molecular data. RESULTS 96 % of 138 patients had high levels of citrulline and high ratio of threonine to serine, which is the distinctive feature of plasma amino acid profile for NICCD. A total of 18.1 % of 138 patients had evidence of ALF who presented the most severity hepatic damage, 51.5 % had liver dysfunction, and the remaining 30.4 % presented mild clinical symptoms (non-liver dysfunction). In ALF group, the levels of citrulline, tyrosine, TBIL, ALP, and γ-GT was significantly elevated, and the level of ALB and Fisher ratio was pronounced low. Homozygous mutations of 1,638_1660dup, IVS6+5G.A, or IVS16ins3kb in SLC25A13 gene were only found in ALF and liver dysfunction groups. Supportive treatment including medium-chain triglyceride supplemented diet and fresh frozen plasma could be life-saving and might reverse ALF. CONCLUSIONS High level of citrulline, tyrosine, TBIL, ALP, γ-GT, and ammonia, low level of albumin, and low Fisher ratio were predictors to suggest severe liver damage in NICCD patients who may go on to develop fatal metabolic disorder. Early identification and proper therapy is particularly important for these patients.
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Affiliation(s)
- MinYan Jiang
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
| | - MinZhi Peng
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
| | - ZhiKun Lu
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
| | - YongXian Shao
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
| | - ZongCai Liu
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
| | - XiuZhen Li
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
| | - YunTing Lin
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
| | - Li Liu
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
| | - Wen Zhang
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
| | - YanNa Cai
- Department of Genetics and Endocrinology, Guangzhou Women and Children's Medical Center, Guangzhou, P.R. China
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Dou F, Wu B, Chen J, Liu T, Yu Z, Chen C. Capsaicin inhibits A7r5 cell senescence via the mitochondrial carrier protein Slc25a12. Exp Cell Res 2023; 433:113856. [PMID: 37995921 DOI: 10.1016/j.yexcr.2023.113856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 11/15/2023] [Accepted: 11/16/2023] [Indexed: 11/25/2023]
Abstract
Aging of vascular smooth muscle cells (VSMCs) is the principal factor responsible for the loss of vascular function, and continuous exposure to high glucose is one of the key factors contributing to the aging of VSMCs. This study established a high glucose-induced senescence model of the A7r5 cell line and used transcriptome sequencing to screen the regulatory target genes of high glucose-induced cellular senescence. The study revealed that the expression of the Slc25a12 gene, which belongs to the solute carrier family 25 member 12, was notably reduced following damage caused by high glucose levels. This inhibition was shown to cause mitochondrial malfunction and cellular senescence. The encoded product of the Slc25a12 gene is a mitochondrial carrier protein that binds to calcium and aids in transporting aspartate for glutamate exchange within the inner mitochondrial membrane. Mitochondrial dysfunction compromises the cell's capacity to resist oxidation and repair damage, and is an inherent element in hastening cellular aging. Moreover, our findings validated that the transient receptor potential vanilloid 1 (TRPV1) agonist capsaicin hindered the decrease in Slc25a12 expression, prevented mitochondrial dysfunction, and blocked cellular senescence. Could the regulation of Slc25a12 expression by capsaicin restore cellular mitochondrial function and restrict senescence? In vitro tests have verified that interference with A7r5 Slc25a12 noticeably diminishes capsaicin's effectiveness in repairing mitochondrial function and inhibiting senescence. The findings indicate that capsaicin delays mitochondrial dysfunction and therefore hinders cellular senescence by regulating the mitochondrial membrane protein Slc25a12 in the A7r5 cell line.
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Affiliation(s)
- Fangfang Dou
- Shanghai Geriatric Institute of Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200031, China.
| | - Beiling Wu
- Shanghai Geriatric Institute of Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200031, China.
| | - Jiulin Chen
- Shanghai Geriatric Institute of Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200031, China.
| | - Te Liu
- Shanghai Geriatric Institute of Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200031, China.
| | - Zhihua Yu
- Shanghai Geriatric Institute of Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200031, China.
| | - Chuan Chen
- Shanghai Geriatric Institute of Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200031, China.
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Liu J, Lin S, Guan S, Chen Q, Wang X, He Y, Qi Y, Feng J, Liu Y. Citrin deficiency due to SLC25A13 exon deletion in a Chinese infant: A case report. Medicine (Baltimore) 2023; 102:e36293. [PMID: 38065893 PMCID: PMC10713093 DOI: 10.1097/md.0000000000036293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 11/03/2023] [Indexed: 12/18/2023] Open
Abstract
INTRODUCTION Citrin is a calcium-bound aspartate-glutamate carrier protein encoded by the gene SLC25A13, mutations of which can cause citrin deficiency, an autosomal recessive disorder. The manifestations of citrin deficiency include neonatal intrahepatic choledeposits caused by citrin deficiency (NICCD: OMIM#605814), intermediate growth disorders and dyslipidemia caused by citrin deficiency, and citrullinemia type II (OMIM#603471) in adults. NICCD is a classical metabolic disorder that causes cholestasis in newborns. PATIENT CONCERN AND CLINICAL FINDINGS Here, we present the case of a 2-month-old male patient treated in our hospital on March 20, 2023, due to "postnatal skin xanthochromia and transaminases higher than normal values". Since birth, the child's skin had yellowed all over the body, and his condition did not improve after multiple medical treatments. DIAGNOSIS/INTERVENTION/OUTCOMES The child underwent full exome gene testing at the age of 2 months and 13 days, and the results indicated heterozygous deletion of exon 3 of the SLC25A13 gene, while genetic testing of the parents revealed no gene mutations. The variant was preliminarily judged as being pathogenic according to the ACMG guidelines, and the patient was diagnosed with "citrin deficiency". Skin yellowing eventually subsided, and liver function returned to normal without special treatment. CONCLUSIONS Here, we report a rare case of citrin deficiency caused by a heterozygous deletion of the SLC25A13 gene. This case increases the clinical phenotypic profile of NICCD, suggesting that clinicians must be vigilant regarding such genetic metabolic diseases in the clinic for early diagnosis and treatment. NICCD should always be considered in the differential diagnosis of neonatal cholestasis.
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Affiliation(s)
- Jialing Liu
- Liuhe County Central Hospital, Liuhe Tonghua, Jilin Province, China
| | - Shuangzhu Lin
- The Affiliated Hospital of Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Shihui Guan
- The Affiliated Hospital of Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Qiandui Chen
- Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Xinyao Wang
- Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Yufei He
- Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Yangfan Qi
- Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Jinhua Feng
- The Affiliated Hospital of Changchun University of Chinese Medicine, Changchun, Jilin Province, China
| | - Yushu Liu
- The Affiliated Hospital of Changchun University of Chinese Medicine, Changchun, Jilin Province, China
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Genge MG, Roy Chowdhury S, Dohnálek V, Yunoki K, Hirashima T, Endo T, Doležal P, Mokranjac D. Two domains of Tim50 coordinate translocation of proteins across the two mitochondrial membranes. Life Sci Alliance 2023; 6:e202302122. [PMID: 37748811 PMCID: PMC10520260 DOI: 10.26508/lsa.202302122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 09/13/2023] [Accepted: 09/14/2023] [Indexed: 09/27/2023] Open
Abstract
Hundreds of mitochondrial proteins with N-terminal presequences are translocated across the outer and inner mitochondrial membranes via the TOM and TIM23 complexes, respectively. How translocation of proteins across two mitochondrial membranes is coordinated is largely unknown. Here, we show that the two domains of Tim50 in the intermembrane space, named core and PBD, both have essential roles in this process. Building upon the surprising observation that the two domains of Tim50 can complement each other in trans, we establish that the core domain contains the main presequence-binding site and serves as the main recruitment point to the TIM23 complex. On the other hand, the PBD plays, directly or indirectly, a critical role in cooperation of the TOM and TIM23 complexes and supports the receptor function of Tim50. Thus, the two domains of Tim50 both have essential but distinct roles and together coordinate translocation of proteins across two mitochondrial membranes.
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Affiliation(s)
- Marcel G Genge
- Biocenter-Department of Cell Biology, LMU Munich, Munich, Germany
| | | | - Vít Dohnálek
- Department of Parasitology, Faculty of Science, Charles University, BIOCEV, Vestec, Czech Republic
| | - Kaori Yunoki
- Faculty of Life Sciences and Institute for Protein Dynamics, Kyoto Sangyo University, Kyoto, Japan
| | - Takashi Hirashima
- Faculty of Life Sciences and Institute for Protein Dynamics, Kyoto Sangyo University, Kyoto, Japan
| | - Toshiya Endo
- Faculty of Life Sciences and Institute for Protein Dynamics, Kyoto Sangyo University, Kyoto, Japan
| | - Pavel Doležal
- Department of Parasitology, Faculty of Science, Charles University, BIOCEV, Vestec, Czech Republic
| | - Dejana Mokranjac
- Biocenter-Department of Cell Biology, LMU Munich, Munich, Germany
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19
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Kar D, Manna D, Manjunath LE, Singh A, Som S, Vasu K, Eswarappa SM. Kinetics of Translating Ribosomes Determine the Efficiency of Programmed Stop Codon Readthrough. J Mol Biol 2023; 435:168274. [PMID: 37714299 DOI: 10.1016/j.jmb.2023.168274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 08/15/2023] [Accepted: 09/08/2023] [Indexed: 09/17/2023]
Abstract
During translation, a stop codon on the mRNA signals the ribosomes to terminate the process. In certain mRNAs, the termination fails due to the recoding of the canonical stop codon, and ribosomes continue translation to generate C-terminally extended protein. This process, termed stop codon readthrough (SCR), regulates several cellular functions. SCR is driven by elements/factors that act immediately downstream of the stop codon. Here, we have analysed the process of SCR using a simple mathematical model to investigate how the kinetics of translating ribosomes influences the efficiency of SCR. Surprisingly, the analysis revealed that the rate of translation inversely regulates the efficiency of SCR. We tested this prediction experimentally in mammalian AGO1 and MTCH2 mRNAs. Reduction in translation either globally by harringtonine or locally by rare codons caused an increase in the efficiency of SCR. Thus, our study has revealed a hitherto unknown mode of regulation of SCR.
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Affiliation(s)
- Debaleena Kar
- Department of Biochemistry, Indian Institute of Science, Bengaluru, Karnataka, India. https://twitter.com/debaleenak8
| | - Debraj Manna
- Department of Biochemistry, Indian Institute of Science, Bengaluru, Karnataka, India. https://twitter.com/DebrajManna27
| | - Lekha E Manjunath
- Department of Biochemistry, Indian Institute of Science, Bengaluru, Karnataka, India. https://twitter.com/emlekha
| | - Anumeha Singh
- Department of Biochemistry, Indian Institute of Science, Bengaluru, Karnataka, India. https://twitter.com/Anumehasingh25
| | - Saubhik Som
- Department of Biochemistry, Indian Institute of Science, Bengaluru, Karnataka, India. https://twitter.com/SaubhikSom
| | - Kirtana Vasu
- Department of Biochemistry, Indian Institute of Science, Bengaluru, Karnataka, India
| | - Sandeep M Eswarappa
- Department of Biochemistry, Indian Institute of Science, Bengaluru, Karnataka, India.
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20
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Ge LL, Chen CF, Liu L, Zheng X, Zhang XM, Zhang YD, Mei SY. [Analysis of clinical and genetic variation in neonatal intrahepatic cholestasis caused by citrin deficiency]. Zhonghua Gan Zang Bing Za Zhi 2023; 31:1081-1086. [PMID: 38016774 DOI: 10.3760/cma.j.cn501113-20220624-00345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
Objective: To investigate the clinical phenotype and gene variation conditions in neonatal intrahepatic cholestasis caused by citrin deficiency (NICCD), so as to provide a basis for genetic counseling and clinical diagnosis and treatment of the family. Methods: 11 cases of neonatal intrahepatic cholestasis who visited the Children's Hospital Affiliated to Zhengzhou University between February 2019 and March 2021 were selected as the study subjects. High-throughput sequencing technology was used to detect the gene variation condition in 11 neonatal patients and 100 normal control neonates. The suspicious loci and family members were verified by Sanger sequencing and QPCR technology. Results: All 11 children with NICCD had different degrees of jaundice and liver damage symptoms, combined with coagulation dysfunction and anemia (n = 7), cardiac malformation (n = 2), elevated myocardial enzymes (n = 4), hyperlipidemia (n = 1), hyperkalemia (n = 1), persistent diarrhea (n = 3), developmental delay (n = 1). A total of 10 different types of SLC25A13 gene mutations were detected in 11 cases, including three frameshift mutations, two splicing changes, two missense mutations, one intron insertion, one nonsense mutation, and one heterozygous deletion. After reviewing literature and databases, c.1878delG(p.I627Sfs*73) and exon11 deletion were novel mutations that had not been reported at home or abroad. Conclusion: The clinical features of NICCD are non-specific, and genetic testing aids in the early and accurate diagnosis of the disease, providing an important basis for clinical treatment and genetic counseling for family members. In addition, the detection of novel mutation sites has enriched the SLC25A13 gene variation spectrum.
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Affiliation(s)
- L L Ge
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Children's Hospital Affiliated to Zhengzhou University, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou 450018, China
| | - C F Chen
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Children's Hospital Affiliated to Zhengzhou University, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou 450018, China
| | - L Liu
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Children's Hospital Affiliated to Zhengzhou University, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou 450018, China
| | - X Zheng
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Children's Hospital Affiliated to Zhengzhou University, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou 450018, China
| | - X M Zhang
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Children's Hospital Affiliated to Zhengzhou University, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou 450018, China
| | - Y D Zhang
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Children's Hospital Affiliated to Zhengzhou University, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou 450018, China
| | - S Y Mei
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Children's Hospital Affiliated to Zhengzhou University, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou 450018, China
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21
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Bariş S, Kırık S, Balasar Ö. Importance of targeted next-generation sequencing in pediatric patients with developmental epileptic encephalopathy. Rev Assoc Med Bras (1992) 2023; 69:e20230547. [PMID: 37820178 PMCID: PMC10561910 DOI: 10.1590/1806-9282.20230547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 07/16/2023] [Indexed: 10/13/2023]
Abstract
OBJECTIVE Childhood epilepsy is a common neurological disorder with a prevalence of 300-600 cases per 100,000 people. It is associated with refractory epilepsies, global developmental delay, and epileptic encephalopathies, causing epileptic syndromes characterized by cognitive and behavioral disorders. METHODS In this retrospective cohort study, patients with refractory epilepsy and global developmental delay, defined as epileptic encephalopathy, who applied to the Aydın 7Maternity and Children's Hospital Genetic Diagnosis Center and were followed in the pediatric neurology clinic of our hospital, between July 2018 and July 2021, were included. RESULTS Targeted next-generation sequencing molecular genetics results were reviewed, and 3 ALDH7A1, 1 AARS, 3 CACNA1A, 1 CTNNB1, 1 DCX, 2 DBH, 2 DOCK7, 1 FOLR1, 2 GABRB3, 2 GCH1, 1 VGRIN2B, 1 GUF1, 3 KCNQ2, 2 KCNT1, 1 NECAP1, 1 PCDH19, 1 PNPO, 1 SCN8A, 1 SCN9A, 4 SCN1A, 2 SLC25A22, 1 SLC2A1, 2 SPTAN1, 2 SZT2, 4 TBC1D24, 2 TH, and 1 PCDH19 (X chromosome) mutations were detected in three of the patients using the next-generation sequencing method. CONCLUSION Although the development of gene panels aids in diagnosis, there are still unidentified disorders in this illness category, which is highly variable in genotype and phenotype. Understanding the genetic etiology is vital for genetic counseling and, maybe, the future development of remedies for the etiology.
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Affiliation(s)
- Savaş Bariş
- Aydın Obstetrics and Gynecology Hospital, Genetic Diseases Diagnosis Center – Aydın, Turkiye
| | - Serkan Kırık
- Fırat University, Faculty of Medicine, Pediatric Neurology – Elazığ, Turkiye
| | - Özgür Balasar
- Konya City Hospital, Genetic Diagnosis Center – Konya, Turkiye
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22
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Lenhard S, Gerlich S, Khan A, Rödl S, Bökenkamp JE, Peker E, Zarges C, Faust J, Storchova Z, Räschle M, Riemer J, Herrmann JM. The Orf9b protein of SARS-CoV-2 modulates mitochondrial protein biogenesis. J Cell Biol 2023; 222:e202303002. [PMID: 37682539 PMCID: PMC10491932 DOI: 10.1083/jcb.202303002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 07/06/2023] [Accepted: 08/07/2023] [Indexed: 09/09/2023] Open
Abstract
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) expresses high amounts of the protein Orf9b to target the mitochondrial outer membrane protein Tom70. Tom70 serves as an import receptor for mitochondrial precursors and, independently of this function, is critical for the cellular antiviral response. Previous studies suggested that Orf9b interferes with Tom70-mediated antiviral signaling, but its implication for mitochondrial biogenesis is unknown. In this study, we expressed Orf9b in human HEK293 cells and observed an Orf9b-mediated depletion of mitochondrial proteins, particularly in respiring cells. To exclude that the observed depletion was caused by the antiviral response, we generated a yeast system in which the function of human Tom70 could be recapitulated. Upon expression of Orf9b in these cells, we again observed a specific decline of a subset of mitochondrial proteins and a general reduction of mitochondrial volume. Thus, the SARS-CoV-2 virus is able to modulate the mitochondrial proteome by a direct effect of Orf9b on mitochondrial Tom70-dependent protein import.
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Affiliation(s)
- Svenja Lenhard
- Cell Biology, University of Kaiserslautern, Kaiserslautern, Germany
| | - Sarah Gerlich
- Biochemistry, University of Cologne, Cologne, Germany
- CECAD, University of Cologne, Cologne, Germany
| | - Azkia Khan
- Cell Biology, University of Kaiserslautern, Kaiserslautern, Germany
| | - Saskia Rödl
- Cell Biology, University of Kaiserslautern, Kaiserslautern, Germany
| | - Jan-Eric Bökenkamp
- Molecular Genetics, University of Kaiserslautern, Kaiserslautern, Germany
| | - Esra Peker
- Biochemistry, University of Cologne, Cologne, Germany
- CECAD, University of Cologne, Cologne, Germany
| | - Christine Zarges
- Biochemistry, University of Cologne, Cologne, Germany
- CECAD, University of Cologne, Cologne, Germany
| | - Janina Faust
- Cell Biology, University of Kaiserslautern, Kaiserslautern, Germany
| | - Zuzana Storchova
- Molecular Genetics, University of Kaiserslautern, Kaiserslautern, Germany
| | - Markus Räschle
- Molecular Genetics, University of Kaiserslautern, Kaiserslautern, Germany
| | - Jan Riemer
- Biochemistry, University of Cologne, Cologne, Germany
- CECAD, University of Cologne, Cologne, Germany
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23
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Ramamoorthy K, Sabui S, Manzon KI, Balamurugan AN, Said HM. miR-122-5p is involved in posttranscriptional regulation of the mitochondrial thiamin pyrophosphate transporter ( SLC25A19) in pancreatic acinar cells. Am J Physiol Gastrointest Liver Physiol 2023; 325:G347-G355. [PMID: 37529835 PMCID: PMC10642993 DOI: 10.1152/ajpgi.00106.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 07/19/2023] [Accepted: 07/26/2023] [Indexed: 08/03/2023]
Abstract
Thiamin (vitamin B1) plays a vital role in cellular energy metabolism/ATP production. Pancreatic acinar cells (PACs) obtain thiamin from circulation and convert it to thiamin pyrophosphate (TPP) in the cytoplasm. TPP is then taken up by the mitochondria via a carrier-mediated process that involves the mitochondrial TPP transporter (MTPPT; encoded by the gene SLC25A19). We have previously characterized different aspects of the mitochondrial carrier-mediated TPP uptake process, but nothing is known about its possible regulation at the posttranscriptional level. We address this issue in the current investigations focusing on the role of miRNAs in this regulation. First, we subjected the human (and rat) 3'-untranslated region (3'-UTR) of the SLC25A19 to three in-silico programs, and all have identified putative binding sites for miR-122-5p. Transfecting pmirGLO-hSLC25A19 3'-UTR into rat PAC AR42J resulted in a significant reduction in luciferase activity compared with cells transfected with pmirGLO-empty vector. Mutating as well as truncating the putative miR-122-5p binding sites in the hSLC25A19 3'-UTR led to abrogation of inhibition in luciferase activity in PAC AR42J. Furthermore, transfecting/transducing PAC AR42J and human primary PACs with mimic of miR-122-5p led to a significant inhibition in the level of expression of the MTPPT mRNA and protein as well as in mitochondrial carrier-mediated TPP uptake. Conversely, transfecting PAC AR42J with an inhibitor of miR-122-5p increased MTPPT expression and function. These findings show, for the first time, that expression and function of the MTPPT in PACs are subject to posttranscriptional regulation by miR-122-5p.NEW & NOTEWORTHY This study shows that the expression and function of mitochondrial TPP transporter (MTPPT) are subject to posttranscriptional regulation by miRNA-122-5p in pancreatic acinar cells.
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Affiliation(s)
- Kalidas Ramamoorthy
- Department of Physiology/Biophysics, University of California, Irvine, California, United States
| | - Subrata Sabui
- Department of Physiology/Biophysics, University of California, Irvine, California, United States
- Department of Medical Research, Tibor Rubin Veterans Affairs Medical Center, Long Beach, California, United States
| | - Kameron I Manzon
- Department of Physiology/Biophysics, University of California, Irvine, California, United States
| | - Appakalai N Balamurugan
- Center for Clinical and Translational Research, Abigail Wexner Research Institute, Nationwide Children's Hospital, Columbus, Ohio, United States
- Department of Pediatrics, College of Medicine, The Ohio State University, Columbus, Ohio, United States
| | - Hamid M Said
- Department of Medicine, University of California, Irvine, California, United States
- Department of Physiology/Biophysics, University of California, Irvine, California, United States
- Department of Medical Research, Tibor Rubin Veterans Affairs Medical Center, Long Beach, California, United States
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24
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Jiang H, Xu C, Li W, Zhou L, Fang F. Generation of an induced pluripotent stem cell line (BCHNCi003-A) from a patient with mitochondrial pyruvate carrier deficiency caused by biallelic MPC1 mutations. Stem Cell Res 2023; 72:103206. [PMID: 37769383 DOI: 10.1016/j.scr.2023.103206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 09/11/2023] [Accepted: 09/16/2023] [Indexed: 09/30/2023] Open
Abstract
Mitochondrial pyruvate carrier deficiency (MPYCD) is a rare mitochondrial disease characterized by developmental delay, microcephaly, growth failure, increased serum lactate with a normal lactate/pyruvate ratio. Mutations in the MPC1 gene have been identified to cause MPYCD. Herein, we generated an induced pluripotent stem cell (iPSC) line from the skin fibroblasts of a patient with MPYCD, carrying biallelic mutations, c.208G>A (p.Ala70Thr) and c.290G>A (p.Arg97Gln) in MPC1. These iPSCs showed the expression of pluripotency markers, the ability to differentiate into three germ layers, and MPC1 mutations with normal karyotype.
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Affiliation(s)
- Huafang Jiang
- Department of Pediatrics, Weifang Maternal and Children Health Hospital, China; Department of Neurology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, China
| | - Chaolong Xu
- Department of Neurology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, China
| | - Wenyan Li
- Department of Pediatrics, Weifang Maternal and Children Health Hospital, China
| | - Ling Zhou
- Department of Neurology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, China
| | - Fang Fang
- Department of Neurology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, China.
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25
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Chen CY, Chang MH, Chen HL, Chien YH, Wu JF. The prognosis of citrin deficiency differs between early-identified newborn and later-onset symptomatic infants. Pediatr Res 2023; 94:1151-1157. [PMID: 37029238 DOI: 10.1038/s41390-023-02585-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 02/13/2023] [Accepted: 03/20/2023] [Indexed: 04/09/2023]
Abstract
BACKGROUND The prognosis for patients with citrin deficiency is not always benign. This study examined the differences between patients identified early by newborn screening and patients identified later with cholestasis/hepatitis. MATERIALS AND METHODS This retrospective study included 42 patients with genetically confirmed SLC25A13 mutations who were born between May 1996 and August 2019. Fifteen patients were identified during newborn screening (NBS group) and 27 patients were identified through the onset of cholestasis/hepatitis in infancy (clinical group). RESULTS Overall, 90% of the patients presented with cholestasis, among whom 86% (31/36) recovered at a median age of 174 days. Compared with patients in the clinical group, patients in the NBS group were significantly younger at diagnosis and at cholestasis-free achievement; they also had significantly lower levels of peak direct bilirubin and liver enzymes. At the median follow-up age of 11.8 years, 21% of the patients had dyslipidemia, whereas 36% of the patients had failure to thrive. The overall mortality rate was 2.4%. Variant c.851_854del was the most frequent, constituting 44% of the mutant alleles. CONCLUSION Patients identified early by NBS had a better prognosis, demonstrating the importance of a timely diagnosis of NICCD and the need for careful follow-up. IMPACT Some cases of neonatal intrahepatic cholestasis caused by citrin deficiency (NICCD) are not benign. Compared with patients identified later based on the presence of cholestasis/hepatitis, patients identified early by newborn screening have less severe cholestasis and are cholestasis-free at a significantly younger age. A timely diagnosis is needed, along with follow-up examinations that assess metabolic profile and body weight, to improve the long-term prognosis of NICCD patients.
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Affiliation(s)
- Cheng-Yu Chen
- Department of Pediatrics, National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan
- Department of Pediatrics, National Taiwan University Hospital Hsin-Chu Branch, Hsin-Chu, Taiwan
| | - Mei-Hwei Chang
- Department of Pediatrics, National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan
| | - Huey-Ling Chen
- Department of Pediatrics, National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan
| | - Yin-Hsiu Chien
- Department of Pediatrics, National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan.
- Department of Medical Genetics, National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan.
| | - Jia-Feng Wu
- Department of Pediatrics, National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan.
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26
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Zhang Y, Hu Y, Wang Z, Lin X, Li Z, Ren Y, Zhao J. The translocase of the inner mitochondrial membrane 22-2 is required for mitochondrial membrane function during Arabidopsis seed development. J Exp Bot 2023; 74:4427-4448. [PMID: 37105529 DOI: 10.1093/jxb/erad141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 04/27/2023] [Indexed: 06/19/2023]
Abstract
The carrier translocase (also known as translocase of the inner membrane 22; TIM22 complex) is an important component of the mitochondrial protein import apparatus. However, the biological functions of AtTIM22-2 in Arabidopsis remain poorly defined. Here, we report studies on two tim22-2 mutants that exhibit defects in embryo and endosperm development, leading to seed abortion. AtTIM22-2, which was localized in mitochondria, was widely expressed in embryos and in various seedling organs. Loss of AtTIM22-2 function resulted in irregular mitochondrial cristae, decreased respiratory activity, and a lower membrane potential, together with changes in gene expression and enzyme activity related to reactive oxygen species (ROS) metabolism, leading to increased accumulation of ROS in the embryo. The levels of transcripts encoding mitochondrial protein import components were also altered in the tim22-2 mutants. Furthermore, mass spectrometry, bimolecular fluorescence complementation and co-immunoprecipitation assays revealed that AtTIM22-2 interacted with AtTIM23-2, AtB14.7 (a member of Arabidopsis OEP16 family encoded by At2G42210), and AT5G27395 (mitochondrial inner membrane translocase complex, subunit TIM44-related protein). Taken together, these results demonstrate that AtTIM22-2 is essential for maintaining mitochondrial membrane functions during seed development. These findings lay the foundations for a new model of the composition and functions of the TIM22 complex in higher plants.
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Affiliation(s)
- Yuqin Zhang
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Yuanyuan Hu
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Zhiqin Wang
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Xiaodi Lin
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Zihui Li
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Yafang Ren
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Jie Zhao
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
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27
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Ren H, Xiao CL, Li WR, Liu MZ, Luo JQ. The human glucose and lipid homeostasis-associated genetic polymorphisms do not regulate SLC25A47 gene expression in the liver. Proc Natl Acad Sci U S A 2023; 120:e2307269120. [PMID: 37523565 PMCID: PMC10410707 DOI: 10.1073/pnas.2307269120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023] Open
Affiliation(s)
- Huan Ren
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha410011, China
- Institute of Clinical Pharmacy, Central South University, Changsha410011, China
- Department of Pharmacy, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha410005, China
| | - Chen-Lin Xiao
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha410011, China
- Institute of Clinical Pharmacy, Central South University, Changsha410011, China
| | - Wen-Ru Li
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha410011, China
- Institute of Clinical Pharmacy, Central South University, Changsha410011, China
| | - Mou-Ze Liu
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha410011, China
- Institute of Clinical Pharmacy, Central South University, Changsha410011, China
| | - Jian-Quan Luo
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha410011, China
- Institute of Clinical Pharmacy, Central South University, Changsha410011, China
- National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology (Central South University), Ministry of Education, Changsha, Hunan410011, China
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28
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Liu Q, Fong B, Yoo S, Unruh JR, Guo F, Yu Z, Chen J, Si K, Li R, Zhou C. Nascent mitochondrial proteins initiate the localized condensation of cytosolic protein aggregates on the mitochondrial surface. Proc Natl Acad Sci U S A 2023; 120:e2300475120. [PMID: 37494397 PMCID: PMC10401023 DOI: 10.1073/pnas.2300475120] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 06/21/2023] [Indexed: 07/28/2023] Open
Abstract
Eukaryotes organize cellular contents into membrane-bound organelles and membrane-less condensates, for example, protein aggregates. An unsolved question is why the ubiquitously distributed proteins throughout the cytosol give rise to spatially localized protein aggregates on the organellar surface, like mitochondria. We report that the mitochondrial import receptor Tom70 is involved in the localized condensation of protein aggregates in budding yeast and human cells. This is because misfolded cytosolic proteins do not autonomously aggregate in vivo; instead, they are recruited to the condensation sites initiated by Tom70's substrates (nascent mitochondrial proteins) on the organellar membrane using multivalent hydrophobic interactions. Knocking out Tom70 partially impairs, while overexpressing Tom70 increases the formation and association between cytosolic protein aggregates and mitochondria. In addition, ectopic targeting Tom70 and its substrates to the vacuole surface is able to redirect the localized aggregation from mitochondria to the vacuolar surface. Although other redundant mechanisms may exist, this nascent mitochondrial proteins-based initiation of protein aggregation likely explains the localized condensation of otherwise ubiquitously distributed molecules on the mitochondria. Disrupting the mitochondrial association of aggregates impairs their asymmetric retention during mitosis and reduces the mitochondrial import of misfolded proteins, suggesting a proteostasis role of the organelle-condensate interactions.
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Affiliation(s)
- Qingqing Liu
- Buck Institute for Research on Aging, Novato, CA94945
| | - Benjamin Fong
- Buck Institute for Research on Aging, Novato, CA94945
| | - Seungmin Yoo
- Buck Institute for Research on Aging, Novato, CA94945
| | - Jay R. Unruh
- Stowers Institute for Medical Research, Kansas City, MO64110
| | - Fengli Guo
- Stowers Institute for Medical Research, Kansas City, MO64110
| | - Zulin Yu
- Stowers Institute for Medical Research, Kansas City, MO64110
| | - Jingjing Chen
- Stowers Institute for Medical Research, Kansas City, MO64110
| | - Kausik Si
- Stowers Institute for Medical Research, Kansas City, MO64110
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS66160
| | - Rong Li
- Department of Cell Biology, Center for Cell Dynamics, Johns Hopkins University School of Medicine, Baltimore, MD21205
- Department of Chemical and Biomolecular Engineering, Whiting School of Engineering, Johns Hopkins University, Baltimore, MD21218
- Mechanobiology Institute and Department of Biological Science, National University of Singapore, Singapore117411, Singapore
| | - Chuankai Zhou
- Buck Institute for Research on Aging, Novato, CA94945
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Safran A, Proskorovski-Ohayon R, Eskin-Schwartz M, Yogev Y, Drabkin M, Eremenko E, Aharoni S, Freund O, Jean MM, Agam N, Hadar N, Loewenthal N, Staretz-Chacham O, Birk OS. Hyperinsulinism/hyperammonemia syndrome caused by biallelic SLC25A36 mutation. J Inherit Metab Dis 2023; 46:744-755. [PMID: 36695547 DOI: 10.1002/jimd.12594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 01/06/2023] [Accepted: 01/19/2023] [Indexed: 01/26/2023]
Abstract
Hyperinsulinism/hyperammonemia (HI/HA) syndrome has been known to be caused by dominant gain-of-function mutations in GLUD1, encoding the mitochondrial enzyme glutamate dehydrogenase. Pathogenic GLUD1 mutations enhance enzymatic activity by reducing its sensitivity to allosteric inhibition by GTP. Two recent independent studies showed that a similar HI/HA phenotype can be caused by biallelic mutations in SLC25A36, encoding pyrimidine nucleotide carrier 2 (PNC2), a mitochondrial nucleotide carrier that transports pyrimidine and guanine nucleotides across the inner mitochondrial membrane: one study reported a single case caused by a homozygous truncating mutation in SLC25A36 resulting in lack of expression of SLC25A36 in patients' fibroblasts. A second study described two siblings with a splice site mutation in SLC25A36, causing reduction of mitochondrial GTP content, putatively leading to hyperactivation of glutamate dehydrogenase. In an independent study, through combined linkage analysis and exome sequencing, we demonstrate in four individuals of two Bedouin Israeli related families the same disease-causing SLC25A36 (NM_018155.3) c.284 + 3A > T homozygous splice-site mutation found in the two siblings. We demonstrate that the mutation, while causing skipping of exon 3, does not abrogate expression of mRNA and protein of the mutant SLC25A36 in patients' blood and fibroblasts. Affected individuals had hyperinsulinism, hyperammonemia, borderline low birth weight, tonic-clonic seizures commencing around 6 months of age, yet normal intellect and no significant other morbidities. Chronic constipation, hypothyroidism, and developmental delay previously described in a single patient were not found. We thus verify that biallelic SLC25A36 mutations indeed cause HI/HA syndrome and clearly delineate the disease phenotype.
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Affiliation(s)
- Amit Safran
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
| | - Regina Proskorovski-Ohayon
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
| | - Marina Eskin-Schwartz
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
- Genetics Institute, Soroka Medical Center, Beer Sheva, Israel
| | - Yuval Yogev
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
| | - Max Drabkin
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
| | - Ekaterina Eremenko
- Department of Life Sciences and Shraga Segal Department of Microbiology, Immunology and Genetics, National Institute of Biotechnology in the Negev, Zlotowski Neuroscience Center and the Regenerative Medicine and Stem Cell Research Center, Ben-Gurion University, Beer Sheva, Israel
| | - Sarit Aharoni
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
| | - Ofek Freund
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
| | - Matan M Jean
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
| | - Nadav Agam
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
| | - Noam Hadar
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
| | - Neta Loewenthal
- Pediatric Endocrinology Unit, Pediatric Division, Soroka Medical Center, Beer Sheva, Israel
- Faculty of Health Sciences, Ben Gurion University, Beer Sheva, Israel
| | - Orna Staretz-Chacham
- Faculty of Health Sciences, Ben Gurion University, Beer Sheva, Israel
- Pediatric Metabolic Clinic, Pediatric Division, Soroka Medical Center, Ben-Gurion University, Beer Sheva, Israel
| | - Ohad S Birk
- Morris Kahn Laboratory of Human Genetics at the Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and National Institute for Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel
- Genetics Institute, Soroka Medical Center, Beer Sheva, Israel
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Tomar D, Thomas M, Garbincius JF, Kolmetzky DW, Salik O, Jadiya P, Joseph SK, Carpenter AC, Hajnóczky G, Elrod JW. MICU1 regulates mitochondrial cristae structure and function independently of the mitochondrial Ca 2+ uniporter channel. Sci Signal 2023; 16:eabi8948. [PMID: 37098122 PMCID: PMC10388395 DOI: 10.1126/scisignal.abi8948] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 03/30/2023] [Indexed: 04/27/2023]
Abstract
MICU1 is a calcium (Ca2+)-binding protein that regulates the mitochondrial Ca2+ uniporter channel complex (mtCU) and mitochondrial Ca2+ uptake. MICU1 knockout mice display disorganized mitochondrial architecture, a phenotype that is distinct from that of mice with deficiencies in other mtCU subunits and, thus, is likely not explained by changes in mitochondrial matrix Ca2+ content. Using proteomic and cellular imaging techniques, we found that MICU1 localized to the mitochondrial contact site and cristae organizing system (MICOS) and directly interacted with the MICOS components MIC60 and CHCHD2 independently of the mtCU. We demonstrated that MICU1 was essential for MICOS complex formation and that MICU1 ablation resulted in altered cristae organization, mitochondrial ultrastructure, mitochondrial membrane dynamics, and cell death signaling. Together, our results suggest that MICU1 is an intermembrane space Ca2+ sensor that modulates mitochondrial membrane dynamics independently of matrix Ca2+ uptake. This system enables distinct Ca2+ signaling in the mitochondrial matrix and at the intermembrane space to modulate cellular energetics and cell death in a concerted manner.
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Affiliation(s)
- Dhanendra Tomar
- Cardiovascular Research Center, Department of Cardiovascular Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140
| | - Manfred Thomas
- Cardiovascular Research Center, Department of Cardiovascular Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140
| | - Joanne F. Garbincius
- Cardiovascular Research Center, Department of Cardiovascular Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140
| | - Devin W. Kolmetzky
- Cardiovascular Research Center, Department of Cardiovascular Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140
| | - Oniel Salik
- Cardiovascular Research Center, Department of Cardiovascular Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140
- Health and Exercise Physiology, Ursinus College, Collegeville, PA 19426, USA
| | - Pooja Jadiya
- Cardiovascular Research Center, Department of Cardiovascular Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140
| | - Suresh K. Joseph
- MitoCare Center, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - April C. Carpenter
- Health and Exercise Physiology, Ursinus College, Collegeville, PA 19426, USA
| | - György Hajnóczky
- MitoCare Center, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - John W. Elrod
- Cardiovascular Research Center, Department of Cardiovascular Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140
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Tsai CW, Liu TY, Chao FY, Tu YC, Rodriguez MX, Van Keuren AM, Ma Z, Bankston J, Tsai MF. Evidence supporting the MICU1 occlusion mechanism and against the potentiation model in the mitochondrial calcium uniporter complex. Proc Natl Acad Sci U S A 2023; 120:e2217665120. [PMID: 37036971 PMCID: PMC10120041 DOI: 10.1073/pnas.2217665120] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 03/03/2023] [Indexed: 04/12/2023] Open
Abstract
The mitochondrial calcium uniporter is a Ca2+ channel that imports cytoplasmic Ca2+ into the mitochondrial matrix to regulate cell bioenergetics, intracellular Ca2+ signaling, and apoptosis. The uniporter contains the pore-forming MCU subunit, an auxiliary EMRE protein, and the regulatory MICU1/MICU2 subunits. Structural and biochemical studies have suggested that MICU1 gates MCU by blocking/unblocking the pore. However, mitoplast patch-clamp experiments argue that MICU1 does not block, but instead potentiates MCU via allosteric mechanisms. Here, we address this direct clash of the proposed MICU1 function. Supporting the MICU1-occlusion mechanism, patch-clamp demonstrates that purified MICU1 strongly suppresses MCU Ca2+ currents, and this inhibition is abolished by mutating the MCU-interacting K126 residue. Moreover, a membrane-depolarization assay shows that MICU1 prevents MCU-mediated Na+ flux into intact mitochondria under Ca2+-free conditions. Examining the observations underlying the potentiation model, we found that MICU1 occlusion was not detected in mitoplasts not because MICU1 cannot block, but because MICU1 dissociates from the uniporter complex. Furthermore, MICU1 depletion reduces uniporter transport not because MICU1 can potentiate MCU, but because EMRE is down-regulated. These results firmly establish the molecular mechanisms underlying the physiologically crucial process of uniporter regulation by MICU1.
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Affiliation(s)
- Chen-Wei Tsai
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO80045
| | - Tsung-Yun Liu
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO80045
| | - Fan-Yi Chao
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO80045
| | - Yung-Chi Tu
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO80045
| | - Madison X. Rodriguez
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO80045
| | - Anna M. Van Keuren
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO80045
| | - Zhiwei Ma
- Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO65211
| | - John Bankston
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO80045
| | - Ming-Feng Tsai
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO80045
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Sautchuk R, Yu C, McArthur M, Massie C, Brookes PS, Porter GA, Awad H, Eliseev RA. Role of the Mitochondrial Permeability Transition in Bone Metabolism and Aging. J Bone Miner Res 2023; 38:522-540. [PMID: 36779737 PMCID: PMC10101909 DOI: 10.1002/jbmr.4787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 02/02/2023] [Accepted: 02/07/2023] [Indexed: 02/14/2023]
Abstract
The mitochondrial permeability transition pore (MPTP) and its positive regulator, cyclophilin D (CypD), play important pathophysiological roles in aging. In bone tissue, higher CypD expression and pore activity are found in aging; however, a causal relationship between CypD/MPTP and bone degeneration needs to be established. We previously reported that CypD expression and MPTP activity are downregulated during osteoblast (OB) differentiation and that manipulations in CypD expression affect OB differentiation and function. Using a newly developed OB-specific CypD/MPTP gain-of-function (GOF) mouse model, we here present evidence that overexpression of a constitutively active K166Q mutant of CypD (caCypD) impairs OB energy metabolism and function, and bone morphological and biomechanical parameters. Specifically, in a spatial-dependent and sex-dependent manner, OB-specific CypD GOF led to a decrease in oxidative phosphorylation (OxPhos) levels, higher oxidative stress, and general metabolic adaptations coincident with the decreased bone organic matrix content in long bones. Interestingly, accelerated bone degeneration was present in vertebral bones regardless of sex. Overall, our work confirms CypD/MPTP overactivation as an important pathophysiological mechanism leading to bone degeneration and fragility in aging. © 2023 American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Rubens Sautchuk
- Center for Musculoskeletal ResearchUniversity of Rochester, Rochester, NY, USA
| | - Chen Yu
- Center for Musculoskeletal ResearchUniversity of Rochester, Rochester, NY, USA
| | - Matthew McArthur
- Center for Musculoskeletal ResearchUniversity of Rochester, Rochester, NY, USA
| | - Christine Massie
- Center for Musculoskeletal ResearchUniversity of Rochester, Rochester, NY, USA
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, USA
| | - Paul S Brookes
- Department of Anesthesiology and Perioperative Medicine, University of Rochester, Rochester, NY, USA
- Department of Pharmacology & Physiology, University of Rochester, Rochester, NY, USA
| | - George A Porter
- Department of Pediatrics, Division of Cardiology, University of Rochester, Rochester, NY, USA
| | - Hani Awad
- Center for Musculoskeletal ResearchUniversity of Rochester, Rochester, NY, USA
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, USA
| | - Roman A Eliseev
- Center for Musculoskeletal ResearchUniversity of Rochester, Rochester, NY, USA
- Department of Pharmacology & Physiology, University of Rochester, Rochester, NY, USA
- Department of Pathology, University of Rochester, Rochester, NY, USA
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33
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Busch JD, Fielden LF, Pfanner N, Wiedemann N. Mitochondrial protein transport: Versatility of translocases and mechanisms. Mol Cell 2023; 83:890-910. [PMID: 36931257 DOI: 10.1016/j.molcel.2023.02.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 02/14/2023] [Accepted: 02/16/2023] [Indexed: 03/17/2023]
Abstract
Biogenesis of mitochondria requires the import of approximately 1,000 different precursor proteins into and across the mitochondrial membranes. Mitochondria exhibit a wide variety of mechanisms and machineries for the translocation and sorting of precursor proteins. Five major import pathways that transport proteins to their functional intramitochondrial destination have been elucidated; these pathways range from the classical amino-terminal presequence-directed pathway to pathways using internal or even carboxy-terminal targeting signals in the precursors. Recent studies have provided important insights into the structural organization of membrane-embedded preprotein translocases of mitochondria. A comparison of the different translocases reveals the existence of at least three fundamentally different mechanisms: two-pore-translocase, β-barrel switching, and transport cavities open to the lipid bilayer. In addition, translocases are physically engaged in dynamic interactions with respiratory chain complexes, metabolite transporters, quality control factors, and machineries controlling membrane morphology. Thus, mitochondrial preprotein translocases are integrated into multi-functional networks of mitochondrial and cellular machineries.
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Affiliation(s)
- Jakob D Busch
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Laura F Fielden
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
| | - Nikolaus Pfanner
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany; CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany.
| | - Nils Wiedemann
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany; CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany.
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Pasquadibisceglie A, Quadrotta V, Polticelli F. In Silico Analysis of the Structural Dynamics and Substrate Recognition Determinants of the Human Mitochondrial Carnitine/Acylcarnitine SLC25A20 Transporter. Int J Mol Sci 2023; 24:ijms24043946. [PMID: 36835358 PMCID: PMC9961348 DOI: 10.3390/ijms24043946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/02/2023] [Accepted: 02/09/2023] [Indexed: 02/18/2023] Open
Abstract
The Carnitine-Acylcarnitine Carrier is a member of the mitochondrial Solute Carrier Family 25 (SLC25), known as SLC25A20, involved in the electroneutral exchange of acylcarnitine and carnitine across the inner mitochondrial membrane. It acts as a master regulator of fatty acids β-oxidation and is known to be involved in neonatal pathologies and cancer. The transport mechanism, also known as "alternating access", involves a conformational transition in which the binding site is accessible from one side of the membrane or the other. In this study, through a combination of state-of-the-art modelling techniques, molecular dynamics, and molecular docking, the structural dynamics of SLC25A20 and the early substrates recognition step have been analyzed. The results obtained demonstrated a significant asymmetry in the conformational changes leading to the transition from the c- to the m-state, confirming previous observations on other homologous transporters. Moreover, analysis of the MD simulations' trajectories of the apo-protein in the two conformational states allowed for a better understanding of the role of SLC25A20 Asp231His and Ala281Val pathogenic mutations, which are at the basis of Carnitine-Acylcarnitine Translocase Deficiency. Finally, molecular docking coupled to molecular dynamics simulations lend support to the multi-step substrates recognition and translocation mechanism already hypothesized for the ADP/ATP carrier.
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Affiliation(s)
| | | | - Fabio Polticelli
- Department of Sciences, University of Roma Tre, 00146 Rome, Italy
- National Institute of Nuclear Physics, Roma Tre Section, 00146 Rome, Italy
- Correspondence:
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Patel A, Pietromicca JG, Venkatesan M, Maity S, Bard JE, Madesh M, Alevriadou BR. Modulation of the mitochondrial Ca 2+ uniporter complex subunit expression by different shear stress patterns in vascular endothelial cells. Physiol Rep 2023; 11:e15588. [PMID: 36754446 PMCID: PMC9908435 DOI: 10.14814/phy2.15588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 12/26/2022] [Accepted: 01/06/2023] [Indexed: 06/18/2023] Open
Abstract
Mitochondrial calcium (m Ca2+ ) uptake occurs via the Mitochondrial Ca2+ Uniporter (MCU) complex and plays a critical role in mitochondrial dynamics, mitophagy, and apoptosis. MCU complex activity is in part modulated by the expression of its regulatory subunits. Cardiovascular disease models demonstrated altered gene/protein expression of one or multiple subunits in different cells, including vascular endothelial cells (ECs). MCU complex activity was found necessary for stable flow (s-flow)-induced mitophagy and promotion of an atheroprotective EC phenotype. Disturbed flow (d-flow) is known to lead to an atheroprone phenotype. Despite the role of MCU in flow-regulated EC function, flow-induced alterations in MCU complex subunit expression are currently unknown. We exposed cultured human ECs to atheroprotective (steady shear stress, SS) or atheroprone flow (oscillatory shear stress, OS) and measured mRNA and protein levels of the MCU complex members. SS and OS differentially modulated subunit expression at gene/protein levels. Protein expression changes of the core MCU, m Ca2+ uptake 1 (MICU1) and MCU regulator 1 (MCUR1) subunits in SS- and OS-exposed, compared to static, ECs suggested an enhanced m Ca2+ influx under each flow and a potential contribution to EC dysfunction under OS. In silico analysis of a single-cell RNA-sequencing dataset was employed to extract transcript values of MCU subunits in mouse carotid ECs from regions exposed to s-flow or d-flow. Mcu and Mcur1 genes showed significant differences in expression after prolonged exposure to each flow. The differential expression of MCU complex subunits indicated a tight regulation of the complex activity under physiological and pathological hemodynamic conditions.
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Affiliation(s)
- Akshar Patel
- Vascular Mechanobiology Laboratory, Department of Biomedical Engineering, and Center for Cell, Gene, and Tissue EngineeringUniversity at Buffalo – The State University of New YorkBuffaloNew YorkUSA
| | - Julia G. Pietromicca
- Vascular Mechanobiology Laboratory, Department of Biomedical Engineering, and Center for Cell, Gene, and Tissue EngineeringUniversity at Buffalo – The State University of New YorkBuffaloNew YorkUSA
| | - Manigandan Venkatesan
- Department of Medicine, Center for Mitochondrial MedicineUniversity of Texas Health San AntonioSan AntonioTexasUSA
| | - Soumya Maity
- Department of Medicine, Center for Mitochondrial MedicineUniversity of Texas Health San AntonioSan AntonioTexasUSA
| | - Jonathan E. Bard
- Genomics and Bioinformatics Core, Jacobs School of Medicine and Biomedical SciencesUniversity at Buffalo – The State University of New YorkBuffaloNew YorkUSA
| | - Muniswamy Madesh
- Department of Medicine, Center for Mitochondrial MedicineUniversity of Texas Health San AntonioSan AntonioTexasUSA
| | - B. Rita Alevriadou
- Vascular Mechanobiology Laboratory, Department of Biomedical Engineering, and Center for Cell, Gene, and Tissue EngineeringUniversity at Buffalo – The State University of New YorkBuffaloNew YorkUSA
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Hong K, Yang Q, Liu G, Qiu H, Yu B. Cyclophilin D Regulates Oxidative Stress and Apoptosis via Mitochondrial Permeability Transition Pore in Acute Acalculous Cholecystitis. Curr Mol Med 2023; 23:971-980. [PMID: 36089783 DOI: 10.2174/1566524023666220908112922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 08/03/2022] [Accepted: 08/05/2022] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Acute acalculous cholecystitis (AAC) is characterized by acute onset, rapid progression, high mortality, and various complications. Cyclophilin D (CypD) regulates the mitochondrial permeability transition pore (MPTP) and is involved in the occurrence of ischemia-reperfusion injury and inflammation; however, the role of CypD in AAC remains unclear. METHODS Guinea pigs of 300-350 g were randomly divided into three groups, namely the sham group, the common bile duct ligation-24h group (CBDL-24h group), and the CBDL-48h group. Western blot and qRT-PCR were applied to analyze the differential expression of CypD in each group, and transmission electron microscopy was employed to detect changes in mitochondrial structure. Inhibiting the activity of CypD by Cyclosporine A (CsA), we evaluated the difference of mitochondrial utilizing mitochondrial swelling, reactive oxygen species (ROS) detection and mitochondrial membrane potential. RESULTS Compared with the sham group, the prolongation of obstruction aggravated gallbladder inflammation and upregulated CypD expression in the CBDL-24h and CBDL-48h groups. The degree of mitochondrial swelling was increased, and the opening of MPTP was prolonged in the CBDL-24h and 48h groups. Decreasing the expression of CypD could repress the opening of MPTP, prevent manipulation of the mitochondrial membrane potential, and ultimately diminish the levels of intracellular ROS and apoptosis. CONCLUSION CypD plays a proinflammatory role in the development of AAC by regulating the opening of MPTP. Inhibiting the activity of CypD could reduce the levels of ROS and apoptosis, rescue the function of mitochondria and finally alleviate AAC. Therefore, CypD might serve as a potential therapeutic target for ACC.
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Affiliation(s)
- Kunqiao Hong
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan City, Hubei Province, 430060, China
| | - Qian Yang
- Department of Gastroenterology, GuiZhou Provincial People's Hospital, Guiyang City, Guizhou Province, 550002, China
| | - Gen Liu
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Wuhan City, China
- Hubei Key Laboratory of Cardiology, Wuhan City, Hubei Province, 430060, China
| | - Hu Qiu
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan City, Hubei Province, 430060, China
| | - Baoping Yu
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan City, Hubei Province, 430060, China
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Fischer JA, Monroe TO, Pesce LL, Sawicki KT, Quattrocelli M, Bauer R, Kearns SD, Wolf MJ, Puckelwartz MJ, McNally EM. Opposing effects of genetic variation in MTCH2 for obesity versus heart failure. Hum Mol Genet 2023; 32:15-29. [PMID: 35904451 PMCID: PMC9837833 DOI: 10.1093/hmg/ddac176] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 07/04/2022] [Accepted: 07/26/2022] [Indexed: 01/25/2023] Open
Abstract
Genetic variation in genes regulating metabolism may be advantageous in some settings but not others. The non-failing adult heart relies heavily on fatty acids as a fuel substrate and source of ATP. In contrast, the failing heart favors glucose as a fuel source. A bootstrap analysis for genes with deviant allele frequencies in cardiomyopathy cases versus controls identified the MTCH2 gene as having unusual variation. MTCH2 encodes an outer mitochondrial membrane protein, and prior genome-wide studies associated MTCH2 variants with body mass index, consistent with its role in metabolism. We identified the referent allele of rs1064608 (p.Pro290) as being overrepresented in cardiomyopathy cases compared to controls, and linkage disequilibrium analysis associated this variant with the MTCH2 cis eQTL rs10838738 and lower MTCH2 expression. To evaluate MTCH2, we knocked down Mtch in Drosophila heart tubes which produced a dilated and poorly functioning heart tube, reduced adiposity and shortened life span. Cardiac Mtch mutants generated more lactate at baseline, and they displayed impaired oxygen consumption in the presence of glucose but not palmitate. Treatment of cardiac Mtch mutants with dichloroacetate, a pyruvate dehydrogenase kinase inhibitor, reduced lactate and rescued lifespan. Deletion of MTCH2 in human cells similarly impaired oxygen consumption in the presence of glucose but not fatty acids. These data support a model in which MTCH2 reduction may be favorable when fatty acids are the major fuel source, favoring lean body mass. However, in settings like heart failure, where the heart shifts toward using more glucose, reduction of MTCH2 is maladaptive.
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Affiliation(s)
- Julie A Fischer
- Center for Genetic Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Tanner O Monroe
- Center for Genetic Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Lorenzo L Pesce
- Center for Genetic Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Konrad T Sawicki
- Center for Genetic Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Mattia Quattrocelli
- Center for Genetic Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Molecular Cardiovascular Biology, Heart Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
| | - Rosemary Bauer
- Center for Genetic Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Samuel D Kearns
- Center for Genetic Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Matthew J Wolf
- Department of Medicine, Cardiovascular Medicine, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Megan J Puckelwartz
- Center for Genetic Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Elizabeth M McNally
- Center for Genetic Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
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Tsai CW, Rodriguez MX, Van Keuren AM, Phillips CB, Shushunov HM, Lee JE, Garcia AM, Ambardekar AV, Cleveland JC, Reisz JA, Proenza C, Chatfield KC, Tsai MF. Mechanisms and significance of tissue-specific MICU regulation of the mitochondrial calcium uniporter complex. Mol Cell 2022; 82:3661-3676.e8. [PMID: 36206740 PMCID: PMC9557913 DOI: 10.1016/j.molcel.2022.09.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 05/16/2022] [Accepted: 09/07/2022] [Indexed: 12/29/2022]
Abstract
Mitochondrial Ca2+ uptake, mediated by the mitochondrial Ca2+ uniporter, regulates oxidative phosphorylation, apoptosis, and intracellular Ca2+ signaling. Previous studies suggest that non-neuronal uniporters are exclusively regulated by a MICU1-MICU2 heterodimer. Here, we show that skeletal-muscle and kidney uniporters also complex with a MICU1-MICU1 homodimer and that human/mouse cardiac uniporters are largely devoid of MICUs. Cells employ protein-importation machineries to fine-tune the relative abundance of MICU1 homo- and heterodimers and utilize a conserved MICU intersubunit disulfide to protect properly assembled dimers from proteolysis by YME1L1. Using the MICU1 homodimer or removing MICU1 allows mitochondria to more readily take up Ca2+ so that cells can produce more ATP in response to intracellular Ca2+ transients. However, the trade-off is elevated ROS, impaired basal metabolism, and higher susceptibility to death. These results provide mechanistic insights into how tissues can manipulate mitochondrial Ca2+ uptake properties to support their unique physiological functions.
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Affiliation(s)
- Chen-Wei Tsai
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Madison X Rodriguez
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Anna M Van Keuren
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Charles B Phillips
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Hannah M Shushunov
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Jessica E Lee
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Anastacia M Garcia
- Department of Pediatrics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Amrut V Ambardekar
- Division of Cardiology, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Joseph C Cleveland
- Department of Surgery, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Julie A Reisz
- Department of Biochemistry and Molecular Genetics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Catherine Proenza
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Division of Cardiology, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Kathryn C Chatfield
- Department of Pediatrics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Ming-Feng Tsai
- Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
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Han X, Maita N, Shimada A, Kohda D. Effects of targeting signal mutations in a mitochondrial presequence on the spatial distribution of the conformational ensemble in the binding site of Tom20. Protein Sci 2022; 31:e4433. [PMID: 36173160 PMCID: PMC9490799 DOI: 10.1002/pro.4433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/28/2022] [Accepted: 08/24/2022] [Indexed: 11/08/2022]
Abstract
The 20-kDa TOM (translocase of outer mitochondrial membrane) subunit, Tom20, is the first receptor of the protein import pathway into mitochondria. Tom20 recognizes the mitochondrial targeting signal embedded in the presequences attached to mature mitochondrial proteins, as an N-terminal extension. Consequently, ~1,000 different mitochondrial proteins are sorted into the mitochondrial matrix, and distinguished from non-mitochondrial proteins. We previously reported the MPRIDE (multiple partial recognitions in dynamic equilibrium) mechanism to explain the structural basis of the promiscuous recognition of presequences by Tom20. A subset of the targeting signal features is recognized in each pose of the presequence in the binding state, and all of the features are collectively recognized in the dynamic equilibrium between the poses. Here, we changed the volumes of the hydrophobic side chains in the targeting signal, while maintaining the binding affinity. We tethered the mutated presequences to the binding site of Tom20 and placed them in the crystal contact-free space (CCFS) created in the crystal lattice. The spatial distributions of the mutated presequences were visualized as smeared electron densities in the low-pass filtered difference maps obtained by X-ray crystallography. The mutated presequence ensembles shifted their positions in the binding state to accommodate the larger side chains, thus providing positive evidence supporting the use of the MPRIDE mechanism in the promiscuous recognition by Tom20.
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Affiliation(s)
- Xiling Han
- Division of Structural Biology, Medical Institute of BioregulationKyushu UniversityFukuokaJapan
| | - Nobuo Maita
- Division of Structural Biology, Medical Institute of BioregulationKyushu UniversityFukuokaJapan
- Institute for Quantum Life Science, National Institutes for Quantum Science and TechnologyChibaJapan
| | - Atsushi Shimada
- Division of Structural Biology, Medical Institute of BioregulationKyushu UniversityFukuokaJapan
| | - Daisuke Kohda
- Division of Structural Biology, Medical Institute of BioregulationKyushu UniversityFukuokaJapan
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Fevga C, Ferraro F, Breedveld GJ, Savant Sankhla C, Bonifati V. Segmental dystonia as the prominent phenotype resulting from a MICU1 splice variant in a new Indian case. Parkinsonism Relat Disord 2022; 103:141-143. [PMID: 36115200 DOI: 10.1016/j.parkreldis.2022.08.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/19/2022] [Accepted: 08/28/2022] [Indexed: 11/17/2022]
Affiliation(s)
- Christina Fevga
- Erasmus MC, University Medical Center Rotterdam, Department of Clinical Genetics, the Netherlands
| | - Federico Ferraro
- Erasmus MC, University Medical Center Rotterdam, Department of Clinical Genetics, the Netherlands
| | - Guido J Breedveld
- Erasmus MC, University Medical Center Rotterdam, Department of Clinical Genetics, the Netherlands
| | | | - Vincenzo Bonifati
- Erasmus MC, University Medical Center Rotterdam, Department of Clinical Genetics, the Netherlands.
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Flierl A, Schriner SE, Hancock S, Coskun PE, Wallace DC. The mitochondrial adenine nucleotide transporters in myogenesis. Free Radic Biol Med 2022; 188:312-327. [PMID: 35714845 DOI: 10.1016/j.freeradbiomed.2022.05.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 05/21/2022] [Accepted: 05/25/2022] [Indexed: 01/06/2023]
Abstract
Adenine Nucleotide Translocator isoforms (ANTs) exchange ADP/ATP across the inner mitochondrial membrane, are also voltage-activated proton channels and regulate mitophagy and apoptosis. The ANT1 isoform predominates in heart and muscle while ANT2 is systemic. Here, we report the creation of Ant mutant mouse myoblast cell lines with normal Ant1 and Ant2 genes, deficient in either Ant1 or Ant2, and deficient in both the Ant1 and Ant2 genes. These cell lines are immortal under permissive conditions (IFN-γ + serum at 32 °C) permitting expansion but return to normal myoblasts that can be differentiated into myotubes at 37 °C. With this system we were able to complement our Ant1 mutant studies by demonstrating that ANT2 is important for myoblast to myotube differentiation and myotube mitochondrial respiration. ANT2 is also important in the regulation of mitochondrial biogenesis and antioxidant defenses. ANT2 is also associated with increased oxidative stress response and modulation for Ca++ sequestration and activation of the mitochondrial permeability transition (mtPTP) pore during cell differentiation.
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Affiliation(s)
- Adrian Flierl
- Center for Molecular and Mitochondrial Medicine and Genetics and the Department of Biological Chemistry, University of California, Irvine, CA, USA
| | - Samuel E Schriner
- Center for Molecular and Mitochondrial Medicine and Genetics and the Department of Biological Chemistry, University of California, Irvine, CA, USA
| | - Saege Hancock
- Center for Molecular and Mitochondrial Medicine and Genetics and the Department of Biological Chemistry, University of California, Irvine, CA, USA; Center for Mitochondrial and Epigenomic Medicine, Department of Pediatrics, Division of Human Genetics, Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, PA, USA
| | - Pinar E Coskun
- Center for Molecular and Mitochondrial Medicine and Genetics and the Department of Biological Chemistry, University of California, Irvine, CA, USA
| | - Douglas C Wallace
- Center for Molecular and Mitochondrial Medicine and Genetics and the Department of Biological Chemistry, University of California, Irvine, CA, USA; Center for Mitochondrial and Epigenomic Medicine, Department of Pediatrics, Division of Human Genetics, Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, PA, USA.
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Chen HA, Hsu RH, Chen YH, Hsu LW, Chiang SC, Lee NC, Hwu WL, Chiu PC, Chien YH. Improved diagnosis of citrin deficiency by newborn screening using a molecular second-tier test. Mol Genet Metab 2022; 136:330-336. [PMID: 35798653 DOI: 10.1016/j.ymgme.2022.06.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 06/21/2022] [Accepted: 06/23/2022] [Indexed: 01/10/2023]
Abstract
BACKGROUND Citrin deficiency is an autosomal recessive disorder caused by variants of the SLC25A13 gene. Although newborn screening (NBS) provides an opportunity for its early diagnosis and treatment, citrin deficiency detection rates remain lower than those estimated. METHODS Before 2018, NBS for citrin deficiency was based on citrulline levels alone. In June 2018, a second-tier molecular test was implemented to detect 11 common variants of the SLC25A13 gene and improve the NBS detection rates. This study compares the incidence rates and costs before and after the second-tier implementation. RESULTS Prior to 2018, five subjects were diagnosed via NBS, and 12 of 555,449 newborns screened were missed. In comparison, 11 subjects were diagnosed out of 198,071 newborns screened after 2018, and there were no false-negatives. The citrin deficiency detection rate increased from 1/32,673 to 1/18,006 after the second-tier test was implemented, with only a minimal increase in the total cost. The number of false-positive in our cohort was tolerable. Subjects with citrin deficiency may present with borderline elevated citrulline levels; these can remain slightly elevated or increase considerably on retest. Four patients (80%) detected prior to second-tier testing and six patients (55%) detected after it was implemented were identified based on the citrulline levels alone. However, at the time of second blood sampling, the normal citrulline level of five subjects did not exclude a citrin deficiency diagnosis. CONCLUSIONS Our study shows that it is vital and cost-effective to employ second-tier molecular testing to improve the detection of citrin deficiency by NBS.
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Affiliation(s)
- Hui-An Chen
- Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan; Department of Pediatrics, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Rai-Hseng Hsu
- Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan; Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Yu-Han Chen
- Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Li-Wen Hsu
- Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Shu-Chang Chiang
- Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Ni-Chung Lee
- Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan; Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Wuh-Liang Hwu
- Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan; Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
| | - Pao-Chin Chiu
- Department of Pediatrics, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Yin-Hsiu Chien
- Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan; Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan.
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Tavoulari S, Lacabanne D, Thangaratnarajah C, Kunji ERS. Pathogenic variants of the mitochondrial aspartate/glutamate carrier causing citrin deficiency. Trends Endocrinol Metab 2022; 33:539-553. [PMID: 35725541 PMCID: PMC7614230 DOI: 10.1016/j.tem.2022.05.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 04/26/2022] [Accepted: 05/19/2022] [Indexed: 12/22/2022]
Abstract
Citrin deficiency is a pan-ethnic and highly prevalent mitochondrial disease with three different stages: neonatal intrahepatic cholestasis (NICCD), a relatively mild adaptation stage, and type II citrullinemia in adulthood (CTLN2). The cause is the absence or dysfunction of the calcium-regulated mitochondrial aspartate/glutamate carrier 2 (AGC2/SLC25A13), also called citrin, which imports glutamate into the mitochondrial matrix and exports aspartate to the cytosol. In citrin deficiency, these missing transport steps lead to impairment of the malate-aspartate shuttle, gluconeogenesis, amino acid homeostasis, and the urea cycle. In this review, we describe the geological spread and occurrence of citrin deficiency, the metabolic consequences and use our current knowledge of the structure to predict the impact of the known pathogenic mutations on the calcium-regulatory and transport mechanism of citrin.
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Affiliation(s)
- Sotiria Tavoulari
- Medical Research Council Mitochondrial Biology Unit, University of Cambridge, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
| | - Denis Lacabanne
- Medical Research Council Mitochondrial Biology Unit, University of Cambridge, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
| | - Chancievan Thangaratnarajah
- Medical Research Council Mitochondrial Biology Unit, University of Cambridge, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
| | - Edmund R S Kunji
- Medical Research Council Mitochondrial Biology Unit, University of Cambridge, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK.
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Chang Y, Chao D, Chung C, Chou Y, Chang C, Lin C, Chu H, Chen H, Liu T, Juan Y, Chang S, Chang J. Cancer carrier screening in the general population using whole-genome sequencing. Cancer Med 2022; 12:1972-1983. [PMID: 35861108 PMCID: PMC9883534 DOI: 10.1002/cam4.5034] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 06/27/2022] [Accepted: 06/29/2022] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Cancer is a major cause of death, and its early identification and intervention have potential for clinical actionability and benefits for human health. The studies using whole-genome sequencing (WGS) and large samples analysis of cancer-related genes have been rarely done. METHODS We performed WGS to explore germline mutations in coding and non-coding areas of cancer-related genes and non-coding driver genes and regulatory areas. Structural variants (SVs) was also analyzed. We used several tools and a subgrouping method to analyze the variants in 1491 healthy participants. Moreover, 275 cancer-related genes sequencing was carried out in 125 cancer patients. RESULTS The incidence of familial cancer in the Taiwanese general population is 8.79% (131/1491). Cancer carrier rate of cancer-related genes is about 7.04% (105/1491) for pathogenic/likely pathogenic variants (P/LP) on ClinVar database only, and 28.24% (421/1491) for P/LP and loss of function variants. The carrier frequencies of cancer-related genes P/LP on ClinVar database were as follows: 8.40% (11/131), 7.11% (28/394), and 6.83% (66/966) in FC, 1MC, and nMC, respectively. The SVs and non-coding driver gene variants are uncommon. There are 1.54% (23/1491) of actionable cancer genes in American College of Medical Genetics and Genomics (ACMG), and the germline mutation rate of 275 cancer-related genes is 7.2% (9/125) in cancer patients including 4.0% (5/125) of actionable cancer genes in ACMG. After analyzing the frequencies of P/LP variants on GJB2 and SLC25A13 genes, we suggest that these two genes may not be cancer-related genes and need be re-evaluated. CONCLUSIONS WGS analysis can completely detect germline mutations in cancer carriers. This study use subgrouping approach for samples provides a strategy to study whether a gene or variant is a cancer-related gene or variant in the future studies.
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Affiliation(s)
- Ya‐Sian Chang
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
- Epigenome Research CenterChina Medical University HospitalTaichungTaiwan
- Department of Laboratory MedicineChina Medical University HospitalTaichungTaiwan
- School of MedicineChina Medical UniversityTaichungTaiwan
| | - Dy‐San Chao
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
- Epigenome Research CenterChina Medical University HospitalTaichungTaiwan
- Department of Laboratory MedicineChina Medical University HospitalTaichungTaiwan
| | - Chin‐Chun Chung
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
| | - Yu‐Pao Chou
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
- Epigenome Research CenterChina Medical University HospitalTaichungTaiwan
- Department of Laboratory MedicineChina Medical University HospitalTaichungTaiwan
| | - Chieh‐Min Chang
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
- Epigenome Research CenterChina Medical University HospitalTaichungTaiwan
- Department of Laboratory MedicineChina Medical University HospitalTaichungTaiwan
| | - Chia‐Li Lin
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
| | - Hou‐Wei Chu
- Institute of Biomedical Sciences|Academia SinicaTaipeiTaiwan
| | - Hon‐Da Chen
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
- Epigenome Research CenterChina Medical University HospitalTaichungTaiwan
- Department of Laboratory MedicineChina Medical University HospitalTaichungTaiwan
| | - Ting‐Yuan Liu
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
| | - Yu‐Hsuan Juan
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
| | - Shun‐Jen Chang
- Department of Kinesiology, Health and Leisure StudiesNational University of KaohsiungKaohsiungTaiwan
| | - Jan‐Gowth Chang
- Center for Precision MedicineChina Medical University HospitalTaichungTaiwan
- Epigenome Research CenterChina Medical University HospitalTaichungTaiwan
- Department of Laboratory MedicineChina Medical University HospitalTaichungTaiwan
- School of MedicineChina Medical UniversityTaichungTaiwan
- Department of Bioinformatics and Medical EngineeringAsia UniversityTaichungTaiwan
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Samur MB, Gumus G, Canpolat M, Gumus H, Per H, Caglayan AO. Clinical and genetic studies of thiamine metabolism dysfunction syndrome-4: case series and review of the literature. Clin Dysmorphol 2022; 31:125-131. [PMID: 35102031 PMCID: PMC9188987 DOI: 10.1097/mcd.0000000000000411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Thiamine metabolism dysfunction syndrome-4 (THMD-4) is an autosomal recessive inherited rare disease (OMIM #613710) characterized by febrile illness associated episodic encephalopathy, leading to transient neurological dysfunction and progressive polyneuropathy. We report three patients from two different families with normal development, episodic encephalopathy, gait disorder, progressive chronic polyneuropathy characterized by motor difficulties, distal weakness, and hoarseness (dysphonia). We identified a homozygous missense c.576G>C, p.(Gln192His) variant in the SLC25A19 gene in both families by whole-exome sequencing. Following genetic diagnosis, thiamine replacement therapy was started, and improvement was observed in all affected patients. We highlight the associated phenotypes of an SCL25A19 mutation leading to clinical features of THMD-4.
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Affiliation(s)
- M. Bahadir Samur
- Department of Pediatrics, Erciyes University, Faculty of Medicine, Kayseri, Turkey
| | - Gulsum Gumus
- Department of Pediatrics, Division of Pediatric Radiology, Erciyes University, Faculty of Medicine, Kayseri, Turkey
| | - Mehmet Canpolat
- Department of Pediatrics, Division of Pediatric Neurology, Erciyes University Faculty of Medicine, Kayseri, Turkey
| | - Hakan Gumus
- Department of Pediatrics, Division of Pediatric Neurology, Erciyes University Faculty of Medicine, Kayseri, Turkey
| | - Huseyin Per
- Department of Pediatrics, Division of Pediatric Neurology, Erciyes University Faculty of Medicine, Kayseri, Turkey
| | - Ahmet Okay Caglayan
- Department of Medical Genetics, School of Medicine, Dokuz Eylul University, Izmir, Turkey
- Department of Neurosurgery, Yale School of Medicine, CT, USA
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Yiew NKH, Finck BN. The mitochondrial pyruvate carrier at the crossroads of intermediary metabolism. Am J Physiol Endocrinol Metab 2022; 323:E33-E52. [PMID: 35635330 PMCID: PMC9273276 DOI: 10.1152/ajpendo.00074.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 05/04/2022] [Accepted: 05/18/2022] [Indexed: 11/22/2022]
Abstract
Pyruvate metabolism, a central nexus of carbon homeostasis, is an evolutionarily conserved process and aberrant pyruvate metabolism is associated with and contributes to numerous human metabolic disorders including diabetes, cancer, and heart disease. As a product of glycolysis, pyruvate is primarily generated in the cytosol before being transported into the mitochondrion for further metabolism. Pyruvate entry into the mitochondrial matrix is a critical step for efficient generation of reducing equivalents and ATP and for the biosynthesis of glucose, fatty acids, and amino acids from pyruvate. However, for many years, the identity of the carrier protein(s) that transported pyruvate into the mitochondrial matrix remained a mystery. In 2012, the molecular-genetic identification of the mitochondrial pyruvate carrier (MPC), a heterodimeric complex composed of protein subunits MPC1 and MPC2, enabled studies that shed light on the many metabolic and physiological processes regulated by pyruvate metabolism. A better understanding of the mechanisms regulating pyruvate transport and the processes affected by pyruvate metabolism may enable novel therapeutics to modulate mitochondrial pyruvate flux to treat a variety of disorders. Herein, we review our current knowledge of the MPC, discuss recent advances in the understanding of mitochondrial pyruvate metabolism in various tissue and cell types, and address some of the outstanding questions relevant to this field.
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Affiliation(s)
- Nicole K H Yiew
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri
| | - Brian N Finck
- Center for Human Nutrition, Washington University School of Medicine, St. Louis, Missouri
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Ceccarini MR, Precone V, Manara E, Paolacci S, Maltese PE, Benfatti V, Dhuli K, Donato K, Guerri G, Marceddu G, Chiurazzi P, Dalla Ragione L, Beccari T, Bertelli M. A next generation sequencing gene panel for use in the diagnosis of anorexia nervosa. Eat Weight Disord 2022; 27:1869-1880. [PMID: 34822136 DOI: 10.1007/s40519-021-01331-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 11/07/2021] [Indexed: 12/12/2022] Open
Abstract
PURPOSE The aim of this study was to increase knowledge of genes associated with anorexia nervosa (AN) and their diagnostic offer, using a next generation sequencing (NGS) panel for the identification of genetic variants. The rationale underlying this test is that we first analyze the genes associated with syndromic forms of AN, then genes that were found to carry rare variants in AN patients who had undergone segregation analysis, and finally candidate genes intervening in the same molecular pathways or identified by GWAS or in mouse models. METHODS We developed an NGS gene panel and used it to screen 68 Italian AN patients (63 females, 5 males). The panel included 162 genes. Family segregation study was conducted on available relatives of probands who reported significant genetic variants. RESULTS In our analysis, we found potentially deleterious variants in 2 genes (PDE11A and SLC25A13) associated with syndromic forms of anorexia and predicted deleterious variants in the following 12 genes: CD36, CACNA1C, DRD4, EPHX2, ESR1, GRIN2A, GRIN3B, LRP2, NPY4R, PTGS2, PTPN22 and SGPP2. Furthermore, by Sanger sequencing of the promoter region of NNAT, we confirmed the involvement of this gene in the pathogenesis of AN. Family segregation studies further strengthened the possible causative role of CACNA1C, DRD4, GRIN2A, PTGS2, SGPP2, SLC25A13 and NNAT genes in AN etiology. CONCLUSION The major finding of our study is the confirmation of the involvement of the NNAT gene in the pathogenesis of AN; furthermore, this study suggests that NGS-based testing can play an important role in the diagnostic evaluation of AN, excluding syndromic forms and increasing knowledge of the genetic etiology of AN. LEVEL OF EVIDENCE Level I, experimental study.
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Affiliation(s)
- Maria Rachele Ceccarini
- Department of Pharmaceutical Sciences, University of Perugia, Perugia, Italy.
- C.I.B., Consorzio Interuniversitario per le Biotecnologie, Trieste, Italy.
| | | | | | | | | | - Valentina Benfatti
- Department of Eating Disorder, Palazzo Francisci Todi, USL 1 Umbria, Todi, PG, Italy
| | | | | | | | | | - Pietro Chiurazzi
- Dipartimento Universitario Scienze della Vita e Sanità Pubblica, Sezione di Medicina Genomica, Università Cattolica del Sacro Cuore, 00168, Rome, Italy
- Fondazione Policlinico Universitario "A. Gemelli" IRCCS, UOC Genetica Medica, 00168, Roma, Italy
| | - Laura Dalla Ragione
- Department of Eating Disorder, Palazzo Francisci Todi, USL 1 Umbria, Todi, PG, Italy
- Food Science and Human Nutrition Unit, University Campus Biomedico of Rome, Rome, Italy
| | - Tommaso Beccari
- Department of Pharmaceutical Sciences, University of Perugia, Perugia, Italy
- C.I.B., Consorzio Interuniversitario per le Biotecnologie, Trieste, Italy
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48
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Guo L. Mitochondrial ATP synthase inhibitory factor 1 interacts with the p53-cyclophilin D complex and promotes opening of the permeability transition pore. J Biol Chem 2022; 298:101858. [PMID: 35337801 PMCID: PMC9043413 DOI: 10.1016/j.jbc.2022.101858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 03/16/2022] [Accepted: 03/18/2022] [Indexed: 01/17/2023] Open
Abstract
The mitochondrial permeability transition pore (PTP) is a Ca2+-dependent megachannel that plays an important role in mitochondrial physiology and cell fate. Cyclophilin D (CyPD) is a well-characterized PTP regulator, and its binding to the PTP favors pore opening. It has previously been shown that p53 physically interacts with CyPD and opens the PTP during necrosis. Accumulating studies also suggest that the F-ATP synthase contributes to the regulation and formation of the PTP. F-ATP synthase IF1 (mitochondrial ATP synthase inhibitory factor 1) is a natural inhibitor of F-ATP synthase activity; however, whether IF1 participates in the modulation of PTP opening is basically unknown. Here, we demonstrate using calcium retention capacity assay that IF1 overexpression promotes mitochondrial permeability transition via opening of the PTP. Intriguingly, we show that IF1 can interact with the p53-CyPD complex and facilitate cell death. We also demonstrate that the presence of IF1 is necessary for the formation of p53-CyPD complex. Therefore, we suggest that IF1 regulates the PTP via interaction with the p53-CyPD complex, and that IF1 is necessary for the inducing effect of p53-CyPD complex on PTP opening.
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Affiliation(s)
- Lishu Guo
- Center for Mitochondrial Genetics and Health, Greater Bay Area Institute of Precision Medicine (Guangzhou), School of Life Sciences, Fudan University, Shanghai, China; Tongji University Cancer Center, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China.
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Kido J, Häberle J, Sugawara K, Tanaka T, Nagao M, Sawada T, Wada Y, Numakura C, Murayama K, Watanabe Y, Kojima-Ishii K, Sasai H, Kosugiyama K, Nakamura K. Clinical manifestation and long-term outcome of citrin deficiency: Report from a nationwide study in Japan. J Inherit Metab Dis 2022; 45:431-444. [PMID: 35142380 DOI: 10.1002/jimd.12483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 02/08/2022] [Indexed: 11/05/2022]
Abstract
Citrin deficiency is an autosomal recessive disorder caused by mutations in the SLC25A13 gene. The disease can present with age-dependent clinical manifestations: neonatal intrahepatic cholestasis by citrin deficiency (NICCD), failure to thrive, and dyslipidemia by citrin deficiency (FTTDCD), and adult-onset type II citrullinemia (CTLN2). As a nationwide study to investigate the clinical manifestations, medical therapy, and long-term outcome in Japanese patients with citrin deficiency, we collected clinical data of 222 patients diagnosed and/or treated at various different institutions between January 2000 and December 2019. In the entire cohort, 218 patients were alive while 4 patients (1 FTTDCD and 3 CTLN2) had died. All patients <20 years were alive. Patients with citrin deficiency had an increased risk for low weight and length at birth, and CTLN2 patients had an increased risk for growth impairment during adolescence. Liver transplantation has been performed in only 4 patients (1 NICCD, 3 CTLN2) with a good response thereafter. This study reports the diagnosis and clinical course in a large cohort of patients with citrin deficiency and suggests that early intervention including a low carbohydrate diet and MCT supplementation can be associated with improved clinical course and long-term outcome.
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Affiliation(s)
- Jun Kido
- Department of Pediatrics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
- Department of Pediatrics, Kumamoto University Hospital, Kumamoto, Japan
| | - Johannes Häberle
- University Children's Hospital Zurich and Children's Research Centre, Zurich, Switzerland
| | - Keishin Sugawara
- Department of Pediatrics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | - Toju Tanaka
- Department of Pediatrics, National Hospital Organization Hokkaido Medical Center, Sapporo, Japan
| | - Masayoshi Nagao
- Department of Pediatrics, National Hospital Organization Hokkaido Medical Center, Sapporo, Japan
| | - Takaaki Sawada
- Department of Pediatrics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
- Department of Pediatrics, Kumamoto University Hospital, Kumamoto, Japan
| | - Yoichi Wada
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Chikahiko Numakura
- Department of Pediatrics, Yamagata University School of Medicine, Yamagata, Japan
| | - Kei Murayama
- Department of Metabolism, Center for Medical Genetics, Chiba Children's Hospital, Chiba, Japan
| | - Yoriko Watanabe
- Research Institute of Medical Mass Spectrometry, Kurume University School of Medicine, Kurume, Japan
- Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Japan
| | - Kanako Kojima-Ishii
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Hideo Sasai
- Department of Pediatrics, Graduate School of Medicine, Gifu University, Gifu, Japan
| | | | - Kimitoshi Nakamura
- Department of Pediatrics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
- Department of Pediatrics, Kumamoto University Hospital, Kumamoto, Japan
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50
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Wu DL, Wang TS, Liu HJ, Zhang W, Tong XH, Peng DY, Kong LY. Study on the mechanism of Wuzi-Yanzong-Wan-medicated serum interfering with the mitochondrial permeability transition pore in the GC-2 cell induced by atractyloside. Chin J Nat Med 2022; 20:282-289. [PMID: 35487598 DOI: 10.1016/s1875-5364(22)60153-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Indexed: 12/30/2022]
Abstract
Wuzi-Yanzong-Wan (WZYZW) is a classic prescription for male infertility. Our previous investigation has demonstrated that it can inhibit sperm apoptosis via affecting mitochondria, but the underlying mechanisms are unclear. The purpose of the present study was to explore the actions of WZYZW on mitochondrial permeability transition pore (mPTP) in mouse spermatocyte cell line (GC-2 cells) opened by atractyloside (ATR). At first, WZYZW-medicated serum was prepared from rats following oral administration of WZYZW for 7 days. GC-2 cells were divided into control group, model group, positive group, as well as 5%, 10%, 15% WZYZW-medicated serum group. Cyclosporine A (CsA) was used as a positive control. 50 μmol·L-1 ATR was added after drugs incubation. Cell viability was assessed using CCK-8. Apoptosis was detected using flow cytometry and TUNEL method. The opening of mPTP and mitochondrial membrane potential (MMP) were detected by Calcein AM and JC-1 fluorescent probe respectively. The mRNA and protein levels of voltage-dependent anion channel 1 (VDAC1), cyclophilin D (CypD), adenine nucleotide translocator (ANT), cytochrome C (Cyt C), caspase 3, 9 were detected by RT-PCR (real time quantity PCR) and Western blotting respectively. The results demonstrated that mPTP of GC-2 cells was opened after 24 hours of ATR treatment, resulting in decreased MMP and increased apoptosis. Pre-protection with WZYZ-medicated serum and CsA inhibited the opening of mPTP of GC-2 cells induced by ATR associated with increased MMP and decreased apoptosis. Moreover, the results of RT-qPCR and WB suggested that WZYZW-medicated serum could significantly reduce the mRNA and protein levels of VDAC1 and CypD, Caspase-3, 9 and CytC, as well as a increased ratio of Bcl/Bax. However, ANT was not significantly affected. Therefore, these findings indicated that WZYZW inhibited mitochondrial mediated apoptosis by attenuating the opening of mPTP in GC-2 cells. WZYZW-medicated serum inhibited the expressions of VDAC1 and CypD and increased the expression of Bcl-2, which affected the opening of mPTP and exerted protective and anti-apoptotic effects on GC-2 cell induced by ATR.
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Affiliation(s)
- De-Ling Wu
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Bioactive Natural Product Research, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, China; School of Pharmacy, Anhui University of Chinese Medicine, Anhui Province Key Laboratory of Chinese Medical Formula, Hefei 230012, China; School of Integrated Traditional Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei 230012, China
| | - Tong-Sheng Wang
- School of Pharmacy, Anhui University of Chinese Medicine, Anhui Province Key Laboratory of Chinese Medical Formula, Hefei 230012, China
| | - Hong-Juan Liu
- School of Pharmacy, Anhui University of Chinese Medicine, Anhui Province Key Laboratory of Chinese Medical Formula, Hefei 230012, China
| | - Wei Zhang
- School of Pharmacy, Anhui University of Chinese Medicine, Anhui Province Key Laboratory of Chinese Medical Formula, Hefei 230012, China
| | - Xiao-Hui Tong
- School of Pharmacy, Anhui University of Chinese Medicine, Anhui Province Key Laboratory of Chinese Medical Formula, Hefei 230012, China
| | - Dai-Yin Peng
- School of Pharmacy, Anhui University of Chinese Medicine, Anhui Province Key Laboratory of Chinese Medical Formula, Hefei 230012, China.
| | - Ling-Yi Kong
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Bioactive Natural Product Research, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, China.
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