1
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Aryankalayil MJ, Bylicky MA, Martello S, Chopra S, Sproull M, May JM, Shankardass A, MacMillan L, Vanpouille-Box C, Dalo J, Scott KMK, Norman Coleman C. Microarray analysis identifies coding and non-coding RNA markers of liver injury in whole body irradiated mice. Sci Rep 2023; 13:200. [PMID: 36604457 PMCID: PMC9814510 DOI: 10.1038/s41598-022-26784-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 12/20/2022] [Indexed: 01/06/2023] Open
Abstract
Radiation injury from medical, accidental, or intentional sources can induce acute and long-term hepatic dysregulation, fibrosis, and cancer. This long-term hepatic dysregulation decreases quality of life and may lead to death. Our goal in this study is to determine acute changes in biological pathways and discover potential RNA biomarkers predictive of radiation injury. We performed whole transcriptome microarray analysis of mouse liver tissue (C57BL/6 J) 48 h after whole-body irradiation with 1, 2, 4, 8, and 12 Gray to identify significant expression changes in mRNAs, lncRNAs, and miRNAs, We also validated changes in specific RNAs through qRT-PCR. We used Ingenuity Pathway Analysis (IPA) to identify pathways associated with gene expression changes. We observed significant dysregulation of multiple mRNAs across all doses. In contrast, miRNA dysregulation was observed upwards of 2 Gray. The most significantly upregulated mRNAs function as tumor suppressors: Cdkn1a, Phlda3, and Eda2r. The most significantly downregulated mRNAs were involved in hemoglobin synthesis, inflammation, and mitochondrial function including multiple members of Hbb and Hba. The most significantly upregulated miRNA included: miR-34a-5p, miR-3102-5p, and miR-3960, while miR-342-3p, miR-142a-3p, and miR-223-3p were most significantly downregulated. IPA predicted activation of cell cycle checkpoint control pathways and inhibition of pathways relevant to inflammation and erythropoietin. Clarifying expression of mRNA, miRNA and lncRNA at a short time point (48 h) offers insight into potential biomarkers, including radiation markers shared across organs and animal models. This information, once validated in human models, can aid in development of bio-dosimetry biomarkers, and furthers our understanding of acute pathway dysregulation.
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Affiliation(s)
- Molykutty J. Aryankalayil
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA
| | - Michelle A. Bylicky
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA
| | - Shannon Martello
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA
| | - Sunita Chopra
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA
| | - Mary Sproull
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA
| | - Jared M. May
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA
| | - Aman Shankardass
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA
| | - Laurel MacMillan
- grid.420517.50000 0004 0490 0428Gryphon Scientific, Takoma Park, MD 20912 USA
| | - Claire Vanpouille-Box
- grid.5386.8000000041936877XDepartment of Radiation Oncology, Weill Cornell Medicine, New York, NY 10065 USA
| | - Juan Dalo
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA
| | - Kevin M. K. Scott
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA
| | - C. Norman Coleman
- grid.48336.3a0000 0004 1936 8075Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Room B3B406, Bethesda, MD 20892 USA ,grid.48336.3a0000 0004 1936 8075Radiation Research Program, National Cancer Institute, National Institutes of Health, Rockville, MD 20850 USA
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Yoshioka Y, Tachibana Y, Uesaka T, Hioki H, Sato Y, Fukumoto T, Enomoto H. Uts2b is a microbiota-regulated gene expressed in vagal afferent neurons connected to enteroendocrine cells producing cholecystokinin. Biochem Biophys Res Commun 2022; 608:66-72. [PMID: 35390674 DOI: 10.1016/j.bbrc.2022.03.117] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 03/23/2022] [Indexed: 12/20/2022]
Abstract
Enteroendocrine cells (EECs) are the primary sensory cells that sense the gut luminal environment and secret hormones to regulate organ function. Recent studies revealed that vagal afferent neurons are connected to EECs and relay sensory information from EECs to the brain stem. To date, however, the identity of vagal afferent neurons connected to a given EEC subtype and the mode of their gene responses to its intestinal hormone have remained unknown. Hypothesizing that EEC-associated vagal afferent neurons change their gene expression in response to the microbiota-related extracellular stimuli, we conducted comparative gene expression analyses of the nodose-petrosal ganglion complex (NPG) using specific pathogen-free (SPF) and germ-free (GF) mice. We report here that the Uts2b gene, which encodes a functionally unknown neuropeptide, urotensin 2B (UTS2B), is expressed in a microbiota-dependent manner in NPG neurons. In cultured NPG neurons, expression of Uts2b was induced by AR420626, the selective agonist for FFAR3. Moreover, distinct gastrointestinal hormones exerted differential effects on Uts2b expression in NPG neurons, where cholecystokinin (CCK) significantly increased its expression. The majority of Uts2b-expressing NPG neurons expressed CCK-A, the receptor for CCK, which comprised approximately 25% of all CCK-A-expressing NPG neurons. Selective fluorescent labeling of Uts2b-expressing NPG neurons revealed a direct contact of their nerve fibers to CCK-expressing EECs. This study identifies the Uts2b as a microbiota-regulated gene, demonstrates that Uts2b-expressing vagal afferent neurons transduce sensory information from CCK-expressing EECs to the brain, and suggests potential involvement of UTS2B in a modality of CCK actions.
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Affiliation(s)
- Yuta Yoshioka
- Division for Neural Differentiation and Regeneration, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Yoshihisa Tachibana
- Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Toshihiro Uesaka
- Division for Neural Differentiation and Regeneration, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Hiroyuki Hioki
- Department of Neuroanatomy, Juntendo University Graduate School of Medicine, Bunkyo-Ku, Tokyo, Japan
| | - Yuya Sato
- Division for Neural Differentiation and Regeneration, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Takumi Fukumoto
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Gastroenterological Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Hideki Enomoto
- Division for Neural Differentiation and Regeneration, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, Kobe, Japan.
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3
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Complex hereditary peripheral neuropathies caused by novel variants in mitochondrial-related nuclear genes. J Neurol 2022; 269:4129-4140. [PMID: 35235001 PMCID: PMC9293870 DOI: 10.1007/s00415-022-11026-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 02/05/2022] [Accepted: 02/11/2022] [Indexed: 11/04/2022]
Abstract
Mitochondrial disorders are a group of clinically and genetically heterogeneous multisystem disorders and peripheral neuropathy is frequently described in the context of mutations in mitochondrial-related nuclear genes. This study aimed to identify the causative mutations in mitochondrial-related nuclear genes in suspected hereditary peripheral neuropathy patients. We enrolled a large Japanese cohort of clinically suspected hereditary peripheral neuropathy patients who were mutation negative in the prescreening of the known Charcot–Marie–Tooth disease-causing genes. We performed whole-exome sequencing on 247 patients with autosomal recessive or sporadic inheritance for further analysis of 167 mitochondrial-related nuclear genes. We detected novel bi-allelic likely pathogenic/pathogenic variants in four patients, from four mitochondrial-related nuclear genes: pyruvate dehydrogenase beta-polypeptide (PDHB), mitochondrial poly(A) polymerase (MTPAP), hydroxyacyl-CoA dehydrogenase/3-ketoacyl-CoA thiolase/enoyl-CoA hydratase, beta subunit (HADHB), and succinate-CoA ligase ADP-forming beta subunit (SUCLA2). All these patients showed sensory and motor axonal polyneuropathy, combined with central nervous system or multisystem involvements. The pathological analysis of skeletal muscles revealed mild neurogenic changes without significant mitochondrial abnormalities. Targeted screening of mitochondria-related nuclear genes should be considered for patients with complex hereditary axonal polyneuropathy, accompanied by central nervous system dysfunctions, or with unexplainable multisystem disorders.
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4
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Ørstavik K, Arntzen KA, Mathisen P, Backe PH, Tangeraas T, Rasmussen M, Kristensen E, Van Ghelue M, Jonsrud C, Bliksrud YT. Novel mutations in the
HADHB
gene causing a mild phenotype of mitochondrial trifunctional protein (
MTP
) deficiency. JIMD Rep 2022; 63:193-198. [PMID: 35433169 PMCID: PMC8995838 DOI: 10.1002/jmd2.12276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 02/08/2022] [Accepted: 02/11/2022] [Indexed: 11/11/2022] Open
Abstract
Mitochondrial trifunctional protein (MTP) deficiency is an ultrarare hereditary recessive disorder causing a broad spectrum of phenotypes with lethal infantile cardiomyopathy at the most severe end. Attenuated forms with polyneuropathy have been reported combined with myoglobinuria or rhabdomyolysis as key features. We here report three young adults (two siblings) in which three variants in the HADHB‐gene were identified. All three cases had a similar mild phenotype with axonal neuropathy and frequent intermittent weakness episodes but without myoglobinuria. Special dietary precautions were recommended to minimize complications especially during infections and other catabolic states. MTP deficiency is therefore an important differential diagnosis in patients with milder fluctuating neuromuscular symptoms.
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Affiliation(s)
- Kristin Ørstavik
- Department of Neurology, Section for Rare Neuromuscular disorders and EMAN Oslo University Hospital, Rikshospitalet Oslo Norway
| | - Kjell Arne Arntzen
- National Neuromuscular Centre Norway and Department of Neurology University Hospital of North Norway Tromsø Norway
| | - Per Mathisen
- Department of Cardiology Oslo University Hospital, Rikshospitalet Oslo Norway
| | - Paul Hoff Backe
- Department of Microbiology Oslo University Hospital, Rikshospitalet and University of Oslo Oslo Norway
- Department of Medical Biochemistry Institute for Clinical Medicine, University of Oslo Oslo Norway
| | - Trine Tangeraas
- Norwegian National Unit for Newborn Screening, Division of Pediatric and Adolescent Medicine Oslo University Hospital Oslo Norway
| | - Magnhild Rasmussen
- Department of Neurology, Section for Rare Neuromuscular disorders and EMAN Oslo University Hospital, Rikshospitalet Oslo Norway
- Department of Clinical Neurosciences for Children Oslo University Hospital, Rikshospitalet Oslo Norway
| | - Erle Kristensen
- Department of Medical Biochemistry Oslo University Hospital, Rikshospitalet Oslo Norway
| | - Marijke Van Ghelue
- Department of Medical Genetics, Division of Child and Adolescent Health University Hospital of North Norway Tromsø Norway
| | - Christoffer Jonsrud
- Department of Medical Genetics, Division of Child and Adolescent Health University Hospital of North Norway Tromsø Norway
| | - Yngve Thomas Bliksrud
- Department of Medical Biochemistry Oslo University Hospital, Rikshospitalet Oslo Norway
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5
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Yang J, Yuan D, Tan X, Zeng Y, Tang N, Chen D, Tan J, Cai R, Huang J, Yan T. Analysis of a family with mitochondrial trifunctional protein deficiency caused by HADHA gene mutations. Mol Med Rep 2021; 25:47. [PMID: 34878152 PMCID: PMC8674702 DOI: 10.3892/mmr.2021.12563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 11/22/2021] [Indexed: 11/21/2022] Open
Abstract
Mitochondrial trifunctional protein (MTP) deficiency (MTPD; MIM 609015) is a metabolic disease of fatty acid oxidation. MTPD is an autosomal recessive disorder caused by mutations in the HADHA gene, encoding the α-subunit of a trifunctional protease, or in the HADHB gene, encoding the β-subunit of a trifunctional protease. To the best of our knowledge, only two cases of families with MTPD due to HADHB gene mutations have been reported in China, and the HADHA gene mutation has not been reported in a Chinese family with MTPD. The present study reported the clinical characteristics and compound heterozygous HADHA gene mutations of two patients with MTPD in the Chinese population. The medical history, routine examination data, blood acyl-carnitine analysis results, results of pathological examination after autopsy and family pedigree map were collected for patients with MTPD. The HADHA gene was analyzed by Sanger sequencing or high-throughput sequencing, the pathogenicity of the newly discovered variant was interpreted by bioinformatics analysis, and the function of the mutated protein was modeled and analyzed according to 3D structure. The two patients with MTPD experienced metabolic crises and died following an infectious disease. Lactate dehydrogenase, creatine kinase (CK), CK-MB and liver enzyme abnormalities were observed in routine examinations. Tandem mass spectrometry revealed that long-chain acyl-carnitine was markedly elevated in blood samples from the patients with MTPD. The autopsy results for one child revealed fat accumulation in the liver and heart. Next-generation sequencing detected compound heterozygous c.703C>T (p.R235W) and c.2107G>A (p.G703R) mutations in the HADHA gene. The mother did not have acute fatty liver during pregnancy with the two patients. Using amniotic fluid prenatal diagnostic testing, the unborn child was confirmed to carry only c.2107G>A (p.G703R). Molecular mechanistic analysis indicated that the two variants affected the conformation of the α-subunit of the MTP enzyme complex, and consequently affected the stability and function of the enzyme complex. The present study comprehensively analyzed the cases, including exome sequencing and protein structure analysis and, to the best of our knowledge, describes the first observation of compound heterozygous mutations in the HADHA gene underlying this disorder in China. The clinical phenotypes of the two heterozygous variants of the HADHA gene are non-lethal. The present study may improve understanding of the HADHA gene mutation spectrum and clinical phenotype in the Chinese population.
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Affiliation(s)
- Jinling Yang
- Newborn Screening Center, Department of Medical Genetics, Key Laboratory of Prevention and Control of Birth Defects, Liuzhou Maternity and Child Health Care Hospital, Affiliated Maternity Hospital and Affiliated Children's Hospital of Guangxi University of Science and Technology, Liuzhou, Guangxi 545000, P.R. China
| | - Dejian Yuan
- Newborn Screening Center, Department of Medical Genetics, Key Laboratory of Prevention and Control of Birth Defects, Liuzhou Maternity and Child Health Care Hospital, Affiliated Maternity Hospital and Affiliated Children's Hospital of Guangxi University of Science and Technology, Liuzhou, Guangxi 545000, P.R. China
| | - Xiaohui Tan
- School of Forensic Medicine, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Yexi Zeng
- Newborn Screening Center, Huizhou Second Maternity and Child Health Care Hospital, Huizhou, Guangdong 516001, P.R. China
| | - Ning Tang
- Newborn Screening Center, Department of Medical Genetics, Key Laboratory of Prevention and Control of Birth Defects, Liuzhou Maternity and Child Health Care Hospital, Affiliated Maternity Hospital and Affiliated Children's Hospital of Guangxi University of Science and Technology, Liuzhou, Guangxi 545000, P.R. China
| | - Dayu Chen
- Newborn Screening Center, Department of Medical Genetics, Key Laboratory of Prevention and Control of Birth Defects, Liuzhou Maternity and Child Health Care Hospital, Affiliated Maternity Hospital and Affiliated Children's Hospital of Guangxi University of Science and Technology, Liuzhou, Guangxi 545000, P.R. China
| | - Jianqiang Tan
- Newborn Screening Center, Department of Medical Genetics, Key Laboratory of Prevention and Control of Birth Defects, Liuzhou Maternity and Child Health Care Hospital, Affiliated Maternity Hospital and Affiliated Children's Hospital of Guangxi University of Science and Technology, Liuzhou, Guangxi 545000, P.R. China
| | - Ren Cai
- Newborn Screening Center, Department of Medical Genetics, Key Laboratory of Prevention and Control of Birth Defects, Liuzhou Maternity and Child Health Care Hospital, Affiliated Maternity Hospital and Affiliated Children's Hospital of Guangxi University of Science and Technology, Liuzhou, Guangxi 545000, P.R. China
| | - Jun Huang
- Newborn Screening Center, Department of Medical Genetics, Key Laboratory of Prevention and Control of Birth Defects, Liuzhou Maternity and Child Health Care Hospital, Affiliated Maternity Hospital and Affiliated Children's Hospital of Guangxi University of Science and Technology, Liuzhou, Guangxi 545000, P.R. China
| | - Tizhen Yan
- Newborn Screening Center, Department of Medical Genetics, Key Laboratory of Prevention and Control of Birth Defects, Liuzhou Maternity and Child Health Care Hospital, Affiliated Maternity Hospital and Affiliated Children's Hospital of Guangxi University of Science and Technology, Liuzhou, Guangxi 545000, P.R. China
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6
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Guan Y, Zhang Y, Shen XM, Zhou L, Shang X, Peng Y, Hu Y, Li W. Charcot-Marie-Tooth Disease With Episodic Rhabdomyolysis Due to Two Novel Mutations in the β Subunit of Mitochondrial Trifunctional Protein and Effective Response to Modified Diet Therapy. Front Neurol 2021; 12:694966. [PMID: 34712195 PMCID: PMC8546186 DOI: 10.3389/fneur.2021.694966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 08/30/2021] [Indexed: 11/29/2022] Open
Abstract
A 29-year-old female experienced chronic progressive peripheral neuropathy since childhood and was diagnosed with Charcot–Marie–Tooth disease (CMT) at age 15. She developed recurrent, fever-induced rhabdomyolysis (RM) at age 24. EMG studies showed decreased amplitude of compound muscle action potential, declined motor conductive velocity, and absence of sensor nerve action potential. Acylcarnitine analysis revealed elevated C16-OH, C18-OH, and C18:1-OH. Muscle biopsy showed scattered foci of necrotic myofibers invaded by macrophages, occasional regenerating fibers, and remarkable muscle fiber type grouping. Whole-exome sequencing identified two novel heterozygous mutations: c.490G>A (p.G164S) and c.686G>A (p.R229Q) in HADHB gene encoding the β-subunit of mitochondrial trifunctional protein (MTP). Reduction of long-chain fatty acid via dietary restrictions alleviated symptoms effectively. Our study indicates that the defect of the MTP β-subunit accounts for both CMT and RM in the same patient and expands the clinical spectrum of disorders caused by the HADHB mutations. Our systematic review of all MTPD patients with dietary treatment indicates that the effect of dietary treatment is related to the age of onset and the severity of symptoms.
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Affiliation(s)
- Yuqing Guan
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yanxia Zhang
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Xin-Ming Shen
- Department of Neurology, Mayo Clinic, Rochester, MN, United States
| | - Liang Zhou
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Xuan Shang
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Yu Peng
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yafang Hu
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Wei Li
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
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7
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Dagher R, Massie R, Gentil BJ. MTP deficiency caused by HADHB mutations: Pathophysiology and clinical manifestations. Mol Genet Metab 2021; 133:1-7. [PMID: 33744096 DOI: 10.1016/j.ymgme.2021.03.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/08/2021] [Accepted: 03/09/2021] [Indexed: 12/17/2022]
Abstract
Mutations in the HADHB gene lead to Mitochondrial Trifunctional Protein (MTP) deficiency. MTP deficiency is a rare autosomal recessive disorder affecting long-chain fatty acid oxidation. Patients affected by MTP deficiency are unable to metabolize long-chain fatty-acids and suffer a variety of symptoms exacerbated during fasting. The three phenotypes associated with complete MTP deficiency are an early-onset cardiomyopathy and early death, an intermediate form with recurrent hypoketotic hypoglycemia and a sensorimotor neuropathy with episodic rhabdomyolysis with small amount of residual enzyme activities. This review aims to discuss the pathophysiological mechanisms and clinical manifestations of each phenotype, which appears different and linked to HADHB expression levels. Notably, the pathophysiology of the sensorimotor neuropathy is relatively unknown and we provide a hypothesis on the qualitative aspect of the role of acylcarnitine buildup in Schwann cells in MTP deficiency patients. We propose that acylcarnitine may exit the Schwann cell and alter membrane properties of nearby axons leading to axonal degeneration based on recent findings in different metabolic disorders.
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Affiliation(s)
- Robin Dagher
- Department of Kinesiology and Physical Education, McGill University, Montreal, QC H3A 2B4, Canada
| | - Rami Massie
- Department of Neurology/Neurosurgery, McGill University, Montreal, QC H3A 2B4, Canada
| | - Benoit J Gentil
- Department of Kinesiology and Physical Education, McGill University, Montreal, QC H3A 2B4, Canada; Department of Neurology/Neurosurgery, McGill University, Montreal, QC H3A 2B4, Canada.
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8
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Pyrroloquinoline Quinone Modifies Lipid Profile, but Not Insulin Sensitivity, of Palmitic Acid-Treated L6 Myotubes. Int J Mol Sci 2020; 21:ijms21218382. [PMID: 33171690 PMCID: PMC7664924 DOI: 10.3390/ijms21218382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/03/2020] [Accepted: 11/06/2020] [Indexed: 12/28/2022] Open
Abstract
Pyrroloquinoline quinone (PQQ) is a novel stimulator of mitochondrial biogenesis and cellular energy metabolism. This is the first study investigating regulatory mechanisms and metabolic responses underlying PQQ’s action in palmitate-exposed L6 myotubes. Particularly, we assessed alterations in lipid content and composition, expression of metabolic enzymes, and changes in glucose transport. The experiments were conducted using muscle cells subjected to short (2 h) and prolonged (24 h) incubation with PQQ in a sequence of pre- and post-palmitic acid (PA) exposure. We demonstrated the opposite effects of 2 and 24 h treatments with PQQ on lipid content, i.e., a decline in the level of free fatty acids and triacylglycerols in response to short-time PQQ incubation as compared to increases in diacylglycerol and triacylglycerol levels observed after 24 h. We did not demonstrate a significant impact of PQQ on fatty acid transport. The analysis of metabolic enzyme expression showed that the vast majority of PQQ-dependent alterations cumulated in the PA/PQQ 24 h group, including elevated protein amount of peroxisome proliferator activated receptor γ co-activator 1α (PGC-1α), sirtuin-1 (SIRT1), phosphorylated 5′AMP-activated protein kinase (pAMPK), carnitine palmitoyltransferase I (CPT1), citrate synthase (CS), fatty acid synthase (FAS), and serine palmitoyltransferase, long chain base subunit 1 (SPT1). In conclusion, the results mentioned above indicate PQQ-dependent activation of both fatty acid oxidation and lipid synthesis in order to adapt cells to palmitic acid-rich medium, although PQQ did not attenuate insulin resistance in muscle cells.
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9
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Yeung CYC, Schoof EM, Tamáš M, Mackey AL, Kjaer M. Proteomics identifies differences in fibrotic potential of extracellular vesicles from human tendon and muscle fibroblasts. Cell Commun Signal 2020; 18:177. [PMID: 33148271 PMCID: PMC7641822 DOI: 10.1186/s12964-020-00669-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 09/29/2020] [Indexed: 12/21/2022] Open
Abstract
Background Fibroblasts are the powerhouses responsible for the production and assembly of extracellular matrix (ECM). Their activity needs to be tightly controlled especially within the musculoskeletal system, where changes to ECM composition affect force transmission and mechanical loading that are required for effective movement of the body. Extracellular vesicles (EVs) are a mode of cell-cell communication within and between tissues, which has been largely characterised in cancer. However, it is unclear what the role of healthy fibroblast-derived EVs is during tissue homeostasis. Methods Here, we performed proteomic analysis of small EVs derived from primary human muscle and tendon cells to identify the potential functions of healthy fibroblast-derived EVs. Results Mass spectrometry-based proteomics revealed comprehensive profiles for small EVs released from healthy human fibroblasts from different tissues. We found that fibroblast-derived EVs were more similar than EVs from differentiating myoblasts, but there were significant differences between tendon fibroblast and muscle fibroblast EVs. Small EVs from tendon fibroblasts contained higher levels of proteins that support ECM synthesis, including TGFβ1, and muscle fibroblast EVs contained proteins that support myofiber function and components of the skeletal muscle matrix. Conclusions Our data demonstrates a marked heterogeneity among healthy fibroblast-derived EVs, indicating shared tasks between EVs of skeletal muscle myoblasts and fibroblasts, whereas tendon fibroblast EVs could play a fibrotic role in human tendon tissue. These findings suggest an important role for EVs in tissue homeostasis of both tendon and skeletal muscle in humans. Video abstract
Supplementary information Supplementary information accompanies this paper at 10.1186/s12964-020-00669-9.
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Affiliation(s)
- Ching-Yan Chloé Yeung
- Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, Nielsine Nielsens Vej 11, Building 8, Copenhagen, NV, 2400, Denmark. .,Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark.
| | - Erwin M Schoof
- Proteomics Core, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Michal Tamáš
- Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, Nielsine Nielsens Vej 11, Building 8, Copenhagen, NV, 2400, Denmark.,Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark
| | - Abigail L Mackey
- Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, Nielsine Nielsens Vej 11, Building 8, Copenhagen, NV, 2400, Denmark.,Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark.,Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Michael Kjaer
- Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, Nielsine Nielsens Vej 11, Building 8, Copenhagen, NV, 2400, Denmark.,Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark
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10
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Khani M, Taheri H, Shamshiri H, Moazzeni H, Hardy J, Bras JT, InanlooRahatloo K, Alavi A, Nafissi S, Elahi E. Deep geno- and phenotyping in two consanguineous families with CMT2 reveals HADHA as an unusual disease-causing gene and an intronic variant in GDAP1 as an unusual mutation. J Neurol 2020; 268:640-650. [PMID: 32897397 DOI: 10.1007/s00415-020-10171-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/12/2020] [Accepted: 08/14/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND Charcot-Marie-Tooth (CMT) disease is a prevalent and heterogeneous peripheral neuropathy. Most patients affected with the axonal form of CMT (CMT2) do not harbor mutations in the approximately 90 known CMT-associated genes. We aimed to identify causative genes in two CMT2 pedigrees. METHODS Neurologic examination, laboratory tests and brain MRIs were performed. Genetic analysis included exome sequencing of four patients from the two pedigrees. The predicted effect of a deep intronic mutation on splicing was tested by regular and real-time PCR and sequencing. RESULTS Clinical data were consistent with CMT2 diagnosis. Inheritance patterns were autosomal recessive. Exome data of CMT2-101 did not include mutations in known CMT-associated genes. Sequence data, segregation analysis, bioinformatics analysis, evolutionary conservation, and information in the literature strongly implicated HADHA as the causative gene. An intronic variation positioned 23 nucleotides away from following intron/exon border in GDAP1 was ultimately identified as cause of CMT in CMT2-102. It was shown to affect splicing. CONCLUSION The finding of a HADHA mutation as a cause of CMT is of interest because its encoded protein is a subunit of the mitochondrial trifunctional protein (MTP) complex, a mitochondrial enzyme involved in long chain fatty acid oxidation. Long chain fatty acid oxidation is an important source of energy for skeletal muscles. The mutation found in CMT2-102 is only the second intronic mutation reported in GDAP1. The mutation in the CMT2-102 pedigree was outside the canonical splice site sequences, emphasizing the importance of careful examination of available intronic sequences in exome sequence data.
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Affiliation(s)
- Marzieh Khani
- School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - Hanieh Taheri
- School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - Hosein Shamshiri
- Department of Neurology, Tehran University of Medical Sciences, Tehran, Iran
| | - Hamidreza Moazzeni
- School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - John Hardy
- Department of Molecular Neuroscience, Institute of Neurology, University College London, London, UK
| | - Jose Tomas Bras
- Department of Molecular Neuroscience, Institute of Neurology, University College London, London, UK
| | | | - Afagh Alavi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Shahriar Nafissi
- Department of Neurology, Tehran University of Medical Sciences, Tehran, Iran.
| | - Elahe Elahi
- School of Biology, College of Science, University of Tehran, Tehran, Iran.
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11
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Nadjar Y, Souvannanorath S, Maisonobe T, Brisset M, De Lonlay P, Schiff M, Viala K, Boutron A, Nicolas G, Laforêt P. Sensory neuronopathy as a major clinical feature of mitochondrial trifunctional protein deficiency in adults. Rev Neurol (Paris) 2020; 176:380-386. [PMID: 32253025 DOI: 10.1016/j.neurol.2019.11.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 08/22/2019] [Accepted: 11/07/2019] [Indexed: 10/24/2022]
Abstract
INTRODUCTION Mitochondrial trifunctional protein deficiency (MTPD) is a long-chain fatty acid oxidation disorder characterized by co-existence of rhabdomyolysis episodes and peripheral neuropathy. Two phenotypes are described: generalized mitochondrial trifunctional protein deficiency (gMTPD) and isolated long-chain-3-hydroxyacyl-CoA dehydrogenase deficiency (iLCHADD) that is always associated with the c.1528G>C mutation. Peripheral neuropathy of MTPD is commonly described in children as axonal, length-dependent and sensorimotor. OBJECTIVES To report clinical and electrophysiological features of four independent adult MTPD patients with peripheral neuropathy. RESULTS Onset of the disease was characterized in all patients by rhabdomyolysis episodes occurring during childhood preceded by severe hypoglycemic episodes in three patients. Peripheral nerve involvement manifesting as sensory ataxia appeared later, during adolescence or adulthood. In all cases, electroneuromyogram showed no length-dependent sensory potentials decrease characteristic of sensory neuronopathy ("ganglionopathy"). All patients harbored at least one c.1528G>C mutation. DISCUSSION We describe MTPD as a newly hereditary etiology of sensory neuronopathy in adults, specifically in patients with c.1528G>C mutation. MTPD should be screened for by performing plasma acylcarnitines in patients with chronic sensory neuronopathy and additional suggestive features such as exercise intolerance or retinopathy.
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Affiliation(s)
- Y Nadjar
- Département de neurologie, centre de référence des maladies lysosomales, UF neuro-génétique et métabolisme, groupe hospitalier Pitié-Salpêtrière, Assistance publique-Hôpitaux de Paris, Paris, France.
| | - S Souvannanorath
- Centre de référence des maladies neuromusculaires, hôpital Henri-Mondor, Assistance publique-Hôpitaux de Pars, Créteil, France.
| | - T Maisonobe
- Département de neurophysiologie clinique, groupe hospitalier Pitié-Salpêtrière, Assistance publique-Hôpitaux de Paris, Paris, France.
| | - M Brisset
- Département de neurologie, hôpital Raymond-Poincaré, Garches, France; Inserm U1179 Versailles Saint-Quentin-en-Yvelines university, 78180 Montigny-le-Bretonneux, France.
| | - P De Lonlay
- Reference center for inborn errors of metabolism, Necker-Enfants-Malades university hospital, AP-HP, Paris Descartes university, INSERM UMR_S1151, 75015 Paris, France.
| | - M Schiff
- Reference center for inborn errors of metabolism, Robert-Debré university hospital, AP-HP, Paris Diderot university, INSERM U1141, 75019 Paris, France.
| | - K Viala
- Département de neurophysiologie clinique, groupe hospitalier Pitié-Salpêtrière, Assistance publique-Hôpitaux de Paris, Paris, France.
| | - A Boutron
- Service de biochimie, hôpital de Bicêtre, CHU Paris - GH Paris-Sud, Paris, France.
| | - G Nicolas
- Département de neurologie, hôpital Raymond-Poincaré, Garches, France; Inserm U1179 Versailles Saint-Quentin-en-Yvelines university, 78180 Montigny-le-Bretonneux, France.
| | - P Laforêt
- Département de neurologie, hôpital Raymond-Poincaré, Garches, France; Inserm U1179 Versailles Saint-Quentin-en-Yvelines university, 78180 Montigny-le-Bretonneux, France.
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12
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Identification and functional characterization of mutations within HADHB associated with mitochondrial trifunctional protein deficiency. Mitochondrion 2019; 49:200-205. [DOI: 10.1016/j.mito.2019.09.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 08/11/2019] [Accepted: 09/11/2019] [Indexed: 12/24/2022]
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13
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Mitochondrial DNA Variants and Common Diseases: A Mathematical Model for the Diversity of Age-Related mtDNA Mutations. Cells 2019; 8:cells8060608. [PMID: 31216686 PMCID: PMC6627076 DOI: 10.3390/cells8060608] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 05/30/2019] [Accepted: 06/14/2019] [Indexed: 12/18/2022] Open
Abstract
The mitochondrion is the only organelle in the human cell, besides the nucleus, with its own DNA (mtDNA). Since the mitochondrion is critical to the energy metabolism of the eukaryotic cell, it should be unsurprising, then, that a primary driver of cellular aging and related diseases is mtDNA instability over the life of an individual. The mutation rate of mammalian mtDNA is significantly higher than the mutation rate observed for nuclear DNA, due to the poor fidelity of DNA polymerase and the ROS-saturated environment present within the mitochondrion. In this review, we will discuss the current literature showing that mitochondrial dysfunction can contribute to age-related common diseases such as cancer, diabetes, and other commonly occurring diseases. We will then turn our attention to the likely role that mtDNA mutation plays in aging and senescence. Finally, we will use this context to develop a mathematical formula for estimating for the accumulation of somatic mtDNA mutations with age. This resulting model shows that almost 90% of non-proliferating cells would be expected to have at least 100 mutations per cell by the age of 70, and almost no cells would have fewer than 10 mutations, suggesting that mtDNA mutations may contribute significantly to many adult onset diseases.
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14
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SACS variants are a relevant cause of autosomal recessive hereditary motor and sensory neuropathy. Hum Genet 2018; 137:911-919. [PMID: 30460542 DOI: 10.1007/s00439-018-1952-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 10/29/2018] [Indexed: 12/17/2022]
Abstract
Mutations in the SACS gene have been initially reported in a rare autosomal recessive cerebellar ataxia syndrome featuring prominent cerebellar atrophy, spasticity and peripheral neuropathy as well as retinal abnormalities in some cases (autosomal recessive spastic ataxia of Charlevoix-Saguenay, ARSACS). In the past few years, the phenotypic spectrum has broadened, mainly owing to the availability and application of high-throughput genetic testing methods. We identified nine patients (three sib pairs, three singleton cases) with isolated, non-syndromic hereditary motor and sensory neuropathy (HMSN) who carried pathogenic SACS mutations, either in the homozygous or compound heterozygous state. None of the patients displayed spasticity or pyramidal signs. Ataxia, which was noted in only three patients, was consistent with a sensory ataxia. Nerve conduction and nerve biopsy studies showed mixed demyelinating and axonal neuropathy. Brain MRI scans were either normal or revealed isolated upper vermis atrophy of the cerebellum. Our findings confirm the broad clinical spectrum associated with SACS mutations, including pure polyneuropathy without characteristic clinical and brain imaging manifestations of ARSACS.
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15
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Clinical and molecular investigation of 14 Japanese patients with complete TFP deficiency: a comparison with Caucasian cases. J Hum Genet 2017; 62:809-814. [DOI: 10.1038/jhg.2017.52] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 04/12/2017] [Accepted: 04/12/2017] [Indexed: 12/30/2022]
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16
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Yamamoto Y, Matsui N, Hiramatsu Y, Miyazaki Y, Nodera H, Izumi Y, Takashima H, Kaji R. [Mitochondrial trifunctional protein deficiency: an adult patient with similar progress to Charcot-Marie-Tooth disease]. Rinsho Shinkeigaku 2017; 57:82-87. [PMID: 28132977 DOI: 10.5692/clinicalneurol.cn-000976] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A 45-year-old man presented to us due to slowly progressive muscle weakness and sensory disturbances in his lower limbs since his 40's. He reported multiple episodes of exercise-induced severe muscle fatigue and brown urine in his childhood, which disappeared by age 20. A nerve conduction study showed peripheral axonal neuropathy and then Charcot-Marie-Tooth disease (CMT) was considered as the most likely diagnosis; however, exome sequencing failed to identify a mutation in the known genes of CMTs. Since age 55, he recurrently developed severe rhabdomyolysis that required hospitalization. On suspicion of lipid metabolism disorders, we performed serum acylcarnitine analysis, and which revealed mildly elevated long-chain fatty acids. We re-examined variants obtained via exome sequencing and found a mutation in HADHB. Mitochondrial trifunctional protein (MTP) deficiency is a rare autosomal recessive disorder of mitochondrial fatty acid beta-oxidation caused by HADHA or HADHB mutation. It can be a life-threatening multiorgan disorder with early infantile onset, but it can also present in childhood or adolescence with peripheral neuropathy and recurrent rhabdomyolysis. This case of adult-diagnosed MTP deficiency was characterized by slowly progressive peripheral neuropathy masquerading CMT in addition to muscular symptoms. MTP deficiency should be considered in patients with the combination of peripheral neuropathy and recurrent rhabdomyolysis.
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Affiliation(s)
- Yuki Yamamoto
- Department of Clinical Neuroscience, Institute of Biomedical Sciences, Tokushima University Graduate School
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17
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Hong YB, Kang J, Kim JH, Lee J, Kwak G, Hyun YS, Nam SH, Hong HD, Choi YR, Jung SC, Koo H, Lee JE, Choi BO, Chung KW. DGAT2 Mutation in a Family with Autosomal-Dominant Early-Onset Axonal Charcot-Marie-Tooth Disease. Hum Mutat 2016; 37:473-80. [PMID: 26786738 DOI: 10.1002/humu.22959] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 01/12/2016] [Indexed: 01/08/2023]
Abstract
Charcot-Marie-Tooth disease (CMT) is the most common inherited peripheral neuropathy and is a genetically and clinically heterogeneous disorder. We examined a Korean family in which two individuals had an autosomal-dominant axonal CMT with early-onset, sensory ataxia, tremor, and slow disease progression. Pedigree analysis and exome sequencing identified a de novo missense mutation (p.Y223H) in the diacylglycerol O-acyltransferase 2 (DGAT2) gene. DGAT2 encodes an endoplasmic reticulum-mitochondrial-associated membrane protein, acyl-CoA:diacylglycerol acyltransferase, which catalyzes the final step of the triglyceride (TG) biosynthesis pathway. The patient showed consistently decreased serum TG levels, and overexpression of the mutant DGAT2 significantly inhibited the proliferation of mouse motor neuron cells. Moreover, the variant form of human DGAT2 inhibited the axonal branching in the peripheral nervous system of zebrafish. We suggest that mutation of DGAT2 is the novel underlying cause of an autosomal-dominant axonal CMT2 neuropathy. This study will help provide a better understanding of the pathophysiology of axonal CMT and contribute to the molecular diagnostics of peripheral neuropathies.
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Affiliation(s)
- Young Bin Hong
- Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, South Korea
| | - Junghee Kang
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea
| | - Ji Hyun Kim
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea
| | - Jinho Lee
- Neuroscience center, Samsung Medical Center, Seoul, South Korea
| | - Geon Kwak
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.,Neuroscience center, Samsung Medical Center, Seoul, South Korea
| | - Young Se Hyun
- Department of Biological Sciences, Kongju National University, Gongju, South Korea
| | - Soo Hyun Nam
- Department of Biological Sciences, Kongju National University, Gongju, South Korea
| | - Hyun Dae Hong
- Department of Biological Sciences, Kongju National University, Gongju, South Korea
| | - Yu-Ri Choi
- Department of Biochemistry, Ewha Womans University School of Medicine, Seoul, South Korea
| | - Sung-Chul Jung
- Department of Biochemistry, Ewha Womans University School of Medicine, Seoul, South Korea
| | - Heasoo Koo
- Department of Pathology, Ewha Womans University School of Medicine, Mokdong Hospital, Seoul, South Korea
| | - Ji Eun Lee
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.,SGI, Samsung Medical Center, Seoul, South Korea
| | - Byung-Ok Choi
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.,Neuroscience center, Samsung Medical Center, Seoul, South Korea.,Department of Neurology, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Ki Wha Chung
- Department of Biological Sciences, Kongju National University, Gongju, South Korea
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18
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Zorc M, Kunej T. In silico screening of the chicken genome for overlaps between genomic regions: microRNA genes, coding and non-coding transcriptional units, QTL, and genetic variations. Chromosome Res 2016; 24:225-30. [DOI: 10.1007/s10577-016-9517-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 12/05/2015] [Accepted: 01/04/2016] [Indexed: 11/28/2022]
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19
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Law CY, Chang STL, Cho SY, Yau EKC, Ng GSF, Fong NC, Lam CW. Clinical whole-exome sequencing reveals a novel missense pathogenic variant of GNAO1 in a patient with infantile-onset epilepsy. Clin Chim Acta 2015; 451:292-6. [PMID: 26485252 DOI: 10.1016/j.cca.2015.10.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 10/13/2015] [Accepted: 10/13/2015] [Indexed: 02/08/2023]
Abstract
BACKGROUND The cause of infantile-onset epilepsy is complex and is not easily recognized clinically, particularly in paediatric patients who present with non-specific neurological signs, no radiological abnormalities and no metabolic changes. CASE We report a case of infantile-onset epilepsy in a 10-month-old Chinese girl who presented with non-specific neurological signs, no radiological abnormalities and no biochemical disturbances. She first presented at birth with twitching movements and convulsions of an unknown aetiology. Ambulatory EEG showed epileptic rhythmic activities, the presence of asynchrony and runs of sharp waves over the right parietal and central areas. Given the non-specific neurological features and negative structural and biochemical findings, we applied clinical whole-exome sequencing (WES) to determine the underlying aetiology. WES revealed a novel heterozygous missense pathogenic variant, GNAO1:NM_020988.2:c.118G>A; NP_066268.1:p.Gly40Arg. A genetic analysis of the family confirmed the variant identified is a de novo mutation. CONCLUSIONS Clinical WES can streamline genetic analysis and sort out pathogenic genes in an unbiased approach. GNAO1 is a disease-causing gene for the autosomal dominant form of early infantile epileptic encephalopathy. The novel pathogenic variant identified in this case should contribute to our understanding of the expanding spectrum of infantile-onset epilepsy.
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Affiliation(s)
- Chun-Yiu Law
- Department of Pathology, The University of Hong Kong, Hong Kong, China
| | | | - Sun Young Cho
- Department of Laboratory Medicine, School of Medicine, Kyung Hee University, Seoul, Korea
| | - Eric Kin-Cheong Yau
- Department of Paediatrics and Adolescent Medicine, Princess Margaret Hospital, Hong Kong, China
| | - Grace Sui-Fun Ng
- Department of Paediatrics and Adolescent Medicine, Princess Margaret Hospital, Hong Kong, China
| | - Nai-Chung Fong
- Department of Paediatrics and Adolescent Medicine, Princess Margaret Hospital, Hong Kong, China
| | - Ching-Wan Lam
- Department of Pathology, The University of Hong Kong, Hong Kong, China.
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