1
|
Wang W, Liu M, Wu H, Li J, Lv W, Li C, Du C, Feng C, Zhang Y, Cai Y, Jia Y, Hu Y, Qu J, Zhang S, Wu F. The oncogenic role of TIMM8A in cancer and the mechanistic insights into the function in breast cancer cells. Sci Rep 2025; 15:18374. [PMID: 40419670 DOI: 10.1038/s41598-025-03331-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2024] [Accepted: 05/20/2025] [Indexed: 05/28/2025] Open
Abstract
The expression of TIMM8A, a molecular chaperone involved in mitochondrial protein translocation, was observed to be significantly elevated in various tumor types. However, the specific role of TIMM8A in cancer development and its underlying molecular mechanism remains inadequately understood. In this study, our primary objective was to investigate the functional implications of TIMM8A in breast cancer development, while also assessing its expression levels and prognostic relevance in pan-cancer. Notably, TIMM8A exhibited high expression in nearly 33 different cancer types, which was consistently associated with unfavorable clinical outcomes. In breast cancer, TIMM8A exhibited a strong association with prognosis and demonstrated its potential as an independent prognostic indicator. Additionally, the inhibition of TIMM8A effectively impeded the proliferation of MCF-7 and MDA-MB-231 cells, while also suppressing their migratory and invasive capabilities in vitro. Mechanistically, the downregulation of NF-κB p65, upregulation of pro-apoptotic proteins, and regulation of EMT-related proteins were observed upon TIMM8A knockdown. Furthermore, the over-expression of miR-10b-5p effectively hindered the expression of TIMM8A. Collectively, TIMM8A, a critical oncogene, was regulated by miR-10b-5p and could activate NF-κB signaling cascade response, promote apoptosis inhibition and regulate EMT-related protein expression, thereby stimulating proliferation, migration, and invasion of breast cancer cells.
Collapse
Affiliation(s)
- Weiwei Wang
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Mengjie Liu
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Huizi Wu
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Jia Li
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Wei Lv
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Chaofan Li
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Chong Du
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Cong Feng
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Yu Zhang
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Yifan Cai
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Yiwei Jia
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Yijian Hu
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Jingkun Qu
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China
| | - Shuqun Zhang
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China.
| | - Fei Wu
- The Comprehensive Breast Care Center, The Second Affiliated Hospital of Xi'an Jiaotong University, West 5Th Road 157, 710004, Xi'an, Shaanxi, People's Republic of China.
| |
Collapse
|
2
|
Cao Y, Zhang X, Lan L, Li D, Li J, Xie L, Xiong F, Yu L, Wu X, Wang H, Wang Q. Identification of genetic mechanisms of non-isolated auditory neuropathy with various phenotypes in Chinese families. Orphanet J Rare Dis 2025; 20:11. [PMID: 39780253 PMCID: PMC11715445 DOI: 10.1186/s13023-025-03540-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2024] [Accepted: 12/28/2024] [Indexed: 01/11/2025] Open
Abstract
BACKGROUND Non-isolated auditory neuropathy (AN), or syndromic AN, is marked by AN along with additional systemic manifestations. The diagnostic process is challenging due to its varied symptoms and overlap with other syndromes. This study focuses on two mitochondrial function-related genes which result in non-isolated AN, FDXR and TWNK, providing a summary and enrichment analysis of genes associated with non-isolated AN to elucidate the genotype-phenotype correlation and underlying mechanisms. METHODS Seven independent Chinese Han patients with mutations in FDXR and TWNK underwent comprehensive clinical evaluations, genetic testing, and bioinformatics analyses. Diagnostic assessments included auditory brainstem response and distortion product otoacoustic emissions, supplemented by other examinations. Whole exome sequencing and Sanger sequencing validated genetic findings. Pathogenicity was assessed following American College of Medical Genetics and Genomics guidelines. Genes associated with non-isolated AN were summarized from prior reports, and functional enrichment analysis was conducted using Gene Ontology databases. RESULTS A total of 11 variants linked to non-isolated AN were identified in this study, eight of which were novel. Patients' age of hearing loss onset ranged from 2 to 25 years, averaging 11 years. Hearing loss varied from mild to profound, with 57.1%(4/7) of patients having risk factors and 71.4%(5/7) exhibiting additional systemic symptoms such as muscle weakness, ataxia, and high arches. Functional enrichment analysis revealed that genes associated with non-isolated AN predominantly involve mitochondrial processes, affecting the central and peripheral nervous, musculoskeletal, and visual systems. CONCLUSION This study identifies novel mutations in FDXR and TWNK that contribute to non-isolated AN through mitochondrial dysfunction. The findings highlight the role of mitochondrial processes in non-isolated AN, suggesting potential relevance as biomarkers for neurodegenerative diseases. Further research is required to explore these mechanisms and potential therapies.
Collapse
Affiliation(s)
- Yang Cao
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China
| | - Xiaolong Zhang
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China
| | - Lan Lan
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China
| | - Danyang Li
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China
| | - Jin Li
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China
| | - Linyi Xie
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China
| | - Fen Xiong
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China
| | - Lan Yu
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China
| | - Xiaonan Wu
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China
| | - Hongyang Wang
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China.
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China.
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China.
| | - Qiuju Wang
- Senior Department of Otolaryngology Head and Neck Surgery, The 6th Medical Center of Chinese PLA General Hospital, Chinese PLA Medical School, Beijing, 100048, China.
- State Key Laboratory of Hearing and Balance Science, Beijing, 100853, China.
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, China.
| |
Collapse
|
3
|
Shakeri M, Aminian A, Mokhtari K, Bahaeddini M, Tabrizian P, Farahani N, Nabavi N, Hashemi M. Unraveling the molecular landscape of osteoarthritis: A comprehensive review focused on the role of non-coding RNAs. Pathol Res Pract 2024; 260:155446. [PMID: 39004001 DOI: 10.1016/j.prp.2024.155446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2024] [Revised: 06/27/2024] [Accepted: 06/28/2024] [Indexed: 07/16/2024]
Abstract
Osteoarthritis (OA) poses a significant global health challenge, with its prevalence anticipated to increase in the coming years. This review delves into the emerging molecular biomarkers in OA pathology, focusing on the roles of various molecules such as metabolites, noncoding RNAs (ncRNAs), including microRNAs (miRNAs) and long non-coding RNAs (lncRNAs), and circular RNAs (circRNAs). Advances in omics technologies have transformed biomarker identification, enabling comprehensive analyses of the complex pathways involved in OA pathogenesis. Notably, ncRNAs, especially miRNAs and lncRNAs, exhibit dysregulated expression patterns in OA, presenting promising opportunities for diagnosis and therapy. Additionally, the intricate interplay between epigenetic modifications and OA progression highlights the regulatory role of epigenetics in gene expression dynamics. Genome-wide association studies have pinpointed key genes undergoing epigenetic changes, providing insights into the inflammatory processes and chondrocyte hypertrophy typical of OA. Understanding the molecular landscape of OA, including biomarkers and epigenetic mechanisms, holds significant potential for developing innovative diagnostic tools and therapeutic strategies for OA management.
Collapse
Affiliation(s)
- Mohammadreza Shakeri
- MD, Bone and Joint Reconstruction Research Center, Shafa Orthopedic Hospital, Department of Orthopedic, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Amir Aminian
- MD, Bone and Joint Reconstruction Research Center, Shafa Orthopedic Hospital, Department of Orthopedic, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Khatere Mokhtari
- Department of Cellular and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Mohammadreza Bahaeddini
- MD, Bone and Joint Reconstruction Research Center, Shafa Orthopedic Hospital, Department of Orthopedic, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Pouria Tabrizian
- MD, Bone and Joint Reconstruction Research Center, Shafa Orthopedic Hospital, Department of Orthopedic, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Najma Farahani
- Department of Genetics and Molecular Biology, Isfahan University of Medical Sciences, Isfahan, Iran.
| | - Noushin Nabavi
- Independent Researcher, Victoria, British Columbia V8V 1P7, Canada
| | - Mehrdad Hashemi
- Farhikhtegan Medical Convergence Sciences Research Center, Farhikhtegan Hospital Tehran Medical Sciences, Islamic Azad University, Tehran, Iran; Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
| |
Collapse
|
4
|
Wang H, Guan L, Wu X, Guan J, Li J, Li N, Wu K, Gao Y, Bing D, Zhang J, Lan L, Shi T, Li D, Wang W, Xie L, Xiong F, Shi W, Zhao L, Wang D, Yin Y, Wang Q. Clinical and genetic architecture of a large cohort with auditory neuropathy. Hum Genet 2024; 143:293-309. [PMID: 38456936 PMCID: PMC11043192 DOI: 10.1007/s00439-024-02652-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 01/25/2024] [Indexed: 03/09/2024]
Abstract
Auditory neuropathy (AN) is a unique type of language developmental disorder, with no precise rate of genetic contribution that has been deciphered in a large cohort. In a retrospective cohort of 311 patients with AN, pathogenic and likely pathogenic variants of 23 genes were identified in 98 patients (31.5% in 311 patients), and 14 genes were mutated in two or more patients. Among subgroups of patients with AN, the prevalence of pathogenic and likely pathogenic variants was 54.4% and 56.2% in trios and families, while 22.9% in the cases with proband-only; 45.7% and 25.6% in the infant and non-infant group; and 33.7% and 0% in the bilateral and unilateral AN cases. Most of the OTOF gene (96.6%, 28/29) could only be identified in the infant group, while the AIFM1 gene could only be identified in the non-infant group; other genes such as ATP1A3 and OPA1 were identified in both infant and non-infant groups. In conclusion, genes distribution of AN, with the most common genes being OTOF and AIFM1, is totally different from other sensorineural hearing loss. The subgroups with different onset ages showed different genetic spectrums, so did bilateral and unilateral groups and sporadic and familial or trio groups.
Collapse
Affiliation(s)
- Hongyang Wang
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Liping Guan
- Hebei Industrial Technology Research Institute of Genomics in Maternal and Child Health, Shijiazhuang, 050000, People's Republic of China
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, People's Republic of China
| | - Xiaonan Wu
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Jing Guan
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Jin Li
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Nan Li
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, People's Republic of China
| | - Kaili Wu
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Ya Gao
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, People's Republic of China
| | - Dan Bing
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Jianguo Zhang
- Hebei Industrial Technology Research Institute of Genomics in Maternal and Child Health, Shijiazhuang, 050000, People's Republic of China
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, People's Republic of China
| | - Lan Lan
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Tao Shi
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Danyang Li
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Wenjia Wang
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Linyi Xie
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Fen Xiong
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Wei Shi
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Lijian Zhao
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, People's Republic of China
- Medical Technology College, Hebei Medical University, Shijiazhuang, 050000, People's Republic of China
| | - Dayong Wang
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China
| | - Ye Yin
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, People's Republic of China
| | - Qiuju Wang
- Senior Department of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, The Sixth Medical Center of Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, People's Republic of China.
- National Clinical Research Center for Otolaryngologic Diseases, Beijing, 100853, People's Republic of China.
| |
Collapse
|
5
|
Sousa E, Abreu M, Tkachenko N, Rocha J, Falcão Reis C. Case report: Mohr-Tranebjaerg syndrome: hearing impairment as the onset of an insidious disorder with high recurrence risk. Front Neurol 2023; 14:1161940. [PMID: 37325222 PMCID: PMC10267341 DOI: 10.3389/fneur.2023.1161940] [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: 02/08/2023] [Accepted: 05/10/2023] [Indexed: 06/17/2023] Open
Abstract
Mohr-Tranebjaerg syndrome (MTS) is an X-linked recessive disorder caused by TIMM8A loss of function. It is characterized by sensorineural hearing loss in childhood, progressive optic atrophy in early adulthood, early onset dementia and psychiatric symptoms of variable expressivity. We present a family with 4 affected males, explore age-related and interfamilial variability and review the literature. Case report A 31 years-old male developed psychiatric symptoms at age 18 and presented early onset dementia. Sensorineural hearing loss had been diagnosed in childhood. At 28yo, he developed dysarthria, dysphonia, dysmetria, limb hyperreflexia, dystonia, and spasticity following an acute encephalopathic crisis. WES revealed a hemizygous novel likely pathogenic variant in TIMM8A, c.45_61dup p.(His21Argfs*11), establishing the diagnosis of MTS. Genetic counseling of the family allowed the diagnosis of three other symptomatic relatives -3 nephews (11yo and two 6yo twins), children of a carrier sister. The oldest nephew had been followed since 4yo due to speech delay. Sensorineural hearing loss was diagnosed at 9yo, and hearing aids were prescribed. The two other nephews were monozygotic twins, and both had unilateral strabismus. One of the twins had macrocephaly and hypoplasia of the anterior temporal lobe, as disclosed by an MRI performed due to febrile seizures. Both had developmental delays, with the language being the most affected area. Their audiograms confirmed hearing loss. All three nephews were hemizygous for the familial TIMM8A variant. Discussion Hearing loss, an early sign of MTS due to auditory neuropathy, can often be overlooked until more severe features of the disorder manifest. Recurrence risk is high for female carriers, and reproductive options should be offered. Early monitoring of hearing and vision loss and neurological impairment in MTS patients is mandatory since early interventions may positively impact their development. This family showcases the importance of performing a timely etiological investigation of hearing loss and its impact on genetic counseling.
Collapse
Affiliation(s)
- Eulalia Sousa
- Pediatrics Department, Centro Hospitalar Tâmega e Sousa, Penafiel, Portugal
| | - Maria Abreu
- Medical Genetics Unit, Centro de Genética Médica Jacinto Magalhães, Centro Hospitalar Universitário de Santo António, Porto, Portugal
| | - Nataliya Tkachenko
- Medical Genetics Unit, Centro de Genética Médica Jacinto Magalhães, Centro Hospitalar Universitário de Santo António, Porto, Portugal
| | - João Rocha
- Neurology Department, Centro Hospitalar Tâmega e Sousa, Penafiel, Portugal
| | - Cláudia Falcão Reis
- Medical Genetics Unit, Centro de Genética Médica Jacinto Magalhães, Centro Hospitalar Universitário de Santo António, Porto, Portugal
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal
- ICVS/3B's-PT Government Associate Laboratory, Braga, Portugal
| |
Collapse
|
6
|
Xu HH, Zhang Y, He ZH, Di XH, Pan FY, Shi WW. Familial 5.29 Mb deletion in chromosome Xq22.1-q22.3 with a normal phenotype: a rare pedigree and literature review. BMC Med Genomics 2023; 16:111. [PMID: 37217926 DOI: 10.1186/s12920-023-01547-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 05/14/2023] [Indexed: 05/24/2023] Open
Abstract
BACKGROUND Xq22.1-q22.3 deletion is a rare chromosome aberration. The purpose of this study was to identify the correlation between the phenotype and genotype of chromosome Xq22.1-q22.3 deletions. METHODS Chromosome aberrations were identified by copy number variation sequencing (CNV-seq) technology and karyotype analysis. Furthermore, we reviewed patients with Xq22.1-q22.3 deletions or a deletion partially overlapping this region to highlight the rare condition and analyse the genotype-phenotype correlations. RESULTS We described a female foetus who is the "proband" of a Chinese pedigree and carries a heterozygous 5.29 Mb deletion (GRCh37: chrX: 100,460,000-105,740,000) in chromosome Xq22.1-q22.3, which may affect 98 genes from DRP2 to NAP1L4P2. This deletion encompasses 7 known morbid genes: TIMM8A, BTK, GLA, HNRNPH2, GPRASP2, PLP1, and SERPINA7. In addition, the parents have a normal phenotype and are of normal intelligence. The paternal genotype is normal. The mother carries the same deletion in the X chromosome. These results indicate that the foetus inherited this CNV from her mother. Moreover, two more healthy female family members were identified to carry the same CNV deletion through pedigree analysis according to the next-generation sequencing (NGS) results. To our knowledge, this family is the first pedigree to have the largest reported deletion of Xq22.1-q22.3 but to have a normal phenotype with normal intelligence. CONCLUSIONS Our findings further improve the understanding of the genotype-phenotype correlations of chromosome Xq22.1-q22.3 deletions.This report may provide novel information for prenatal diagnosis and genetic counselling for patients who carry similar chromosome abnormalities.
Collapse
Affiliation(s)
- Hui-Hui Xu
- Prenatal Diagnosis Center, Taizhou Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China.
- Medical Research Center, Taizhou Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China.
| | - Yang Zhang
- Medical Research Center, Taizhou Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Zhe-Hang He
- Medical Research Center, Taizhou Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Xing-Hong Di
- Medical Research Center, Taizhou Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Fei-Yan Pan
- Medical Research Center, Taizhou Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Wei-Wu Shi
- Prenatal Diagnosis Center, Taizhou Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China.
- Medical Research Center, Taizhou Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China.
| |
Collapse
|
7
|
Sun L, Lin Z, Zhang J, Shen J, Wang X, Yang J. Genetic etiological analysis of auditory neuropathy spectrum disorder by next-generation sequencing. Front Neurol 2022; 13:1026695. [PMID: 36570450 PMCID: PMC9772003 DOI: 10.3389/fneur.2022.1026695] [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: 08/24/2022] [Accepted: 11/14/2022] [Indexed: 12/12/2022] Open
Abstract
Objective Auditory neuropathy spectrum disease (ANSD) is caused by both environmental and genetic causes and is defined by a failure in peripheral auditory neural transmission but normal outer hair cells function. To date, 13 genes identified as potentially causing ANSD have been documented. To study the etiology of ANSD, we collected 9 probands with ANSD diagnosed in the clinic and performed targeted next-generation sequencing. Methods Nine probands have been identified as ANSD based on the results of the ABR tests and DPOAE/CMs. Genomic DNA extracted from their peripheral blood was examined by next-generation sequencing (NGS) for a gene panel to identify any potential causal variations. For candidate pathogenic genes, we performed co-segregation among all family members of the pedigrees. Subsequently, using a mini-gene assay, we examined the function of a novel splice site mutant of OTOF. Results We analyzed nine cases of patients with ANSD with normal CMs/DPOAE and abnormal ABR, discovered three novel mutants of the OTOF gene that are known to cause ANSD, and six cases of other gene mutations including TBC1D24, LARS2, TIMM8A, MITF, and WFS1. Conclusion Our results extend the mutation spectrum of the OTOF gene and indicate that the genetic etiology of ANSD may be related to gene mutations of TBC1D24, LARS2, TIMM8A, MITF, and WFS1.
Collapse
Affiliation(s)
- Lianhua Sun
- Department of Otorhinolaryngology-Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China,Shanghai Jiao Tong University School of Medicine Ear Institute, Shanghai, China,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China,*Correspondence: Lianhua Sun
| | - Zhengyu Lin
- Department of Otorhinolaryngology-Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China,Shanghai Jiao Tong University School of Medicine Ear Institute, Shanghai, China,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Jifang Zhang
- Department of Otorhinolaryngology-Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China,Shanghai Jiao Tong University School of Medicine Ear Institute, Shanghai, China,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Jiali Shen
- Department of Otorhinolaryngology-Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China,Shanghai Jiao Tong University School of Medicine Ear Institute, Shanghai, China,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Xiaowen Wang
- Department of Otorhinolaryngology-Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China,Shanghai Jiao Tong University School of Medicine Ear Institute, Shanghai, China,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Jun Yang
- Department of Otorhinolaryngology-Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China,Shanghai Jiao Tong University School of Medicine Ear Institute, Shanghai, China,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China,Jun Yang
| |
Collapse
|
8
|
Abstract
PURPOSE OF REVIEW Auditory neuropathy is a disorder of auditory dysfunction characterized by the normal function of the outer hair cells and malfunction of the inner hair cells, synapses, postsynapses and/or auditory afferent nervous system. This review summarizes the process of discovery and naming of auditory neuropathy and describes the acquired, associated genetic disorders and management available. RECENT FINDINGS In the last 40 years, auditory neuropathy has undergone a process of discovery, naming and progressive elucidation of its complex pathological mechanisms. Recent studies have revealed numerous acquired and inherited causative factors associated with auditory neuropathy. Studies have analyzed the pathogenic mechanisms of various genes and the outcomes of cochlear implantation. New therapeutic approaches, such as stem cell therapy and gene therapy are the future trends in the treatment of auditory neuropathy. SUMMARY A comprehensive understanding of the pathogenic mechanisms is crucial in illustrating auditory neuropathy and assist in developing future management strategies.
Collapse
|
9
|
Wang L, Yang Z, He X, Pu S, Yang C, Wu Q, Zhou Z, Cen X, Zhao H. Mitochondrial protein dysfunction in pathogenesis of neurological diseases. Front Mol Neurosci 2022; 15:974480. [PMID: 36157077 PMCID: PMC9489860 DOI: 10.3389/fnmol.2022.974480] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 08/08/2022] [Indexed: 11/21/2022] Open
Abstract
Mitochondria are essential organelles for neuronal function and cell survival. Besides the well-known bioenergetics, additional mitochondrial roles in calcium signaling, lipid biogenesis, regulation of reactive oxygen species, and apoptosis are pivotal in diverse cellular processes. The mitochondrial proteome encompasses about 1,500 proteins encoded by both the nuclear DNA and the maternally inherited mitochondrial DNA. Mutations in the nuclear or mitochondrial genome, or combinations of both, can result in mitochondrial protein deficiencies and mitochondrial malfunction. Therefore, mitochondrial quality control by proteins involved in various surveillance mechanisms is critical for neuronal integrity and viability. Abnormal proteins involved in mitochondrial bioenergetics, dynamics, mitophagy, import machinery, ion channels, and mitochondrial DNA maintenance have been linked to the pathogenesis of a number of neurological diseases. The goal of this review is to give an overview of these pathways and to summarize the interconnections between mitochondrial protein dysfunction and neurological diseases.
Collapse
Affiliation(s)
- Liang Wang
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy/Collaborative Innovation Center for Biotherapy, West China Hospital of Sichuan University, Chengdu, China
| | - Ziyun Yang
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy/Collaborative Innovation Center for Biotherapy, West China Hospital of Sichuan University, Chengdu, China
- School of Life Sciences, Guangxi Normal University, Guilin, China
- Guangxi Universities, Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin, China
- Research Center for Biomedical Sciences, Guangxi Normal University, Guilin, China
| | - Xiumei He
- School of Life Sciences, Guangxi Normal University, Guilin, China
- Guangxi Universities, Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin, China
- Research Center for Biomedical Sciences, Guangxi Normal University, Guilin, China
| | - Shiming Pu
- School of Life Sciences, Guangxi Normal University, Guilin, China
- Guangxi Universities, Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin, China
- Research Center for Biomedical Sciences, Guangxi Normal University, Guilin, China
| | - Cheng Yang
- School of Life Sciences, Guangxi Normal University, Guilin, China
- Guangxi Universities, Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin, China
- Research Center for Biomedical Sciences, Guangxi Normal University, Guilin, China
| | - Qiong Wu
- School of Life Sciences, Guangxi Normal University, Guilin, China
- Guangxi Universities, Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin, China
- Research Center for Biomedical Sciences, Guangxi Normal University, Guilin, China
| | - Zuping Zhou
- Guangxi Universities, Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin, China
- Research Center for Biomedical Sciences, Guangxi Normal University, Guilin, China
| | - Xiaobo Cen
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy/Collaborative Innovation Center for Biotherapy, West China Hospital of Sichuan University, Chengdu, China
| | - Hongxia Zhao
- School of Life Sciences, Guangxi Normal University, Guilin, China
- Guangxi Universities, Key Laboratory of Stem Cell and Biopharmaceutical Technology, Guangxi Normal University, Guilin, China
- Research Center for Biomedical Sciences, Guangxi Normal University, Guilin, China
- Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
| |
Collapse
|
10
|
Rendtorff ND, Karstensen HG, Lodahl M, Tolmie J, McWilliam C, Bak M, Tommerup N, Nazaryan-Petersen L, Kunst H, Wong M, Joss S, Carelli V, Tranebjærg L. Identification and analysis of deletion breakpoints in four Mohr-Tranebjærg syndrome (MTS) patients. Sci Rep 2022; 12:14959. [PMID: 36056138 PMCID: PMC9440042 DOI: 10.1038/s41598-022-18040-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 08/04/2022] [Indexed: 11/25/2022] Open
Abstract
Mohr-Tranebjærg syndrome is an X-linked syndrome characterized by sensorineural hearing impairment in childhood, followed by progressive neurodegeneration leading to a broad phenotypic spectrum. Genetically MTS is caused by pathogenic variants in the TIMM8A gene, including gene deletions and larger contiguous gene deletions. Some of the latter involve the neighboring gene BTK, resulting in agammaglobulinemia. By next-generation mate-pair sequencing we have mapped the chromosomal deletion breakpoints of one MTS case and three XLA-MTS cases and used breakpoint-spanning PCR to fine map the breakpoints by Sanger sequencing. Two of the XLA-MTS cases presented with large deletions (63.5 and 27.2 kb), and the junctional regions were characterized by long stretches of microhomology, indicating that the events have emerged through homologous recombination. Conversely, the MTS case exhibited a small 2 bp region of microhomology, and the regions were not characterized by extensive microhomology. The third XLA-MTS case had a more complex breakpoint, including a 59 bp inverted insertion, thus at least four breakpoints were involved in this event. In conclusion, mate-pair library generation combined with next-generation sequencing is an efficient method for breakpoint identification, also in regions characterized by repetitive elements.
Collapse
Affiliation(s)
- Nanna Dahl Rendtorff
- Department of Clinical Genetics, Center of Diagnostics, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.
| | - Helena Gásdal Karstensen
- Department of Clinical Genetics, Center of Diagnostics, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Marianne Lodahl
- Department of Clinical Genetics, Center of Diagnostics, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - John Tolmie
- Clinical Genetics Service, Laboratory Medicine Building, Southern General Hospital, Glasgow, Scotland
| | - Catherine McWilliam
- Clinical Genetics, Human Genetics Unit, Ninewells Hospital, Dundee, Scotland
| | - Mads Bak
- Department of Clinical Genetics, Center of Diagnostics, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
- Wilhelm Johannsen Center for Functional Genome Research, University of Copenhagen, Copenhagen, Denmark
- Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Niels Tommerup
- Wilhelm Johannsen Center for Functional Genome Research, University of Copenhagen, Copenhagen, Denmark
- Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Lusine Nazaryan-Petersen
- Wilhelm Johannsen Center for Functional Genome Research, University of Copenhagen, Copenhagen, Denmark
- Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen, Denmark
- Center for Genomic Medicine, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Henricus Kunst
- Department of Otorhinolaryngology, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
- Department of Otorhinolaryngology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Melanie Wong
- Department of Allergy and Immunology, The Children's Hospital at Westmead, Sydney, Australia
| | - Shelagh Joss
- West of Scotland Centre for Genomic Medicine, Queen Elizabeth University Hospital, Glasgow, UK
| | - Valerio Carelli
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Programma di Neurogenetica, Bologna, Italy
- Unit of Neurology, Department of Biomedical and NeuroMotor Sciences (DIBINEM), University of Bologna, Bologna, Italy
| | - Lisbeth Tranebjærg
- Department of Clinical Genetics, Center of Diagnostics, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.
- Institute of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.
| |
Collapse
|
11
|
Ouattara N, Chen Z, Huang Y, Chen X, Song P, Xiao Z, Li Q, Guan Y, Li Z, Jiang Y, Xu K, Pan S, Hu Y. Reduced mitochondrial size in hippocampus and psychiatric behavioral changes in the mutant mice with homologous mutation of Timm8a1-I23fs49X. Front Cell Neurosci 2022; 16:972964. [PMID: 36090790 PMCID: PMC9453755 DOI: 10.3389/fncel.2022.972964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 08/01/2022] [Indexed: 11/20/2022] Open
Abstract
Background Deafness-dystonia-optic neuronopathy (DDON) syndrome, a condition that predominantly affects males, is caused by mutations in translocase of mitochondrial inner membrane 8A (TIMM8A)/deafness dystonia protein 1 (DDP1) gene and characterized by progressive deafness coupled with other neurological abnormalities. In a previous study, we demonstrated the phenotype of male mice carrying the hemizygous mutation of Timm8a1-I23fs49X. In a follow-up to that study, this study aimed to observe the behavioral changes in the female mutant (MUT) mice with homologous mutation of Timm8a1 and to elucidate the underlying mechanism for the behavioral changes. Materials and methods Histological analysis, transmission electron microscopy (EM), Western blotting, hearing measurement by auditory brainstem response (ABR), and behavioral observation were compared between the MUT mice and wild-type (WT) littermates. Results The weight of the female MUT mice was less than that of the WT mice. Among MUT mice, both male and female mice showed hearing impairment, anxiety-like behavior by the elevated plus maze test, and cognitive deficit by the Morris water maze test. Furthermore, the female MUT mice exhibited coordination problems in the balance beam test. Although the general neuronal loss was not found in the hippocampus of the MUT genotype, EM assessment indicated that the mitochondrial size showing as aspect ratio and form factor in the hippocampus of the MUT strain was significantly reduced compared to that in the WT genotype. More importantly, this phenomenon was correlated with the upregulation of translation of mitochondrial fission process protein 1(Mtfp1)/mitochondrial 18 kDa protein (Mtp18), a key fission factor that is a positive regulator of mitochondrial fission and mitochondrial size. Interestingly, significant reductions in the size of the uterus and ovaries were noted in the female MUT mice, which contributed to significantly lower fertility in the MUT mice. Conclusion Together, a homologous mutation in the Timm8a1 gene caused the hearing impairment and psychiatric behavioral changes in the MUT mice; the latter phenotype might be related to a reduction in mitochondrial size regulated by MTP18.
Collapse
Affiliation(s)
- Niemtiah Ouattara
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Zirui Chen
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yihua Huang
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Xia Chen
- Department of Clinical Laboratory, Nanhai District People’s Hospital of Foshan, Foshan, China
| | - Pingping Song
- Department of Neurology, First Affiliated Hospital, Jinan University, Guangzhou, China
| | - Zhongju Xiao
- Department of Physiology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Qi Li
- Department of Otolaryngology-Head and Neck Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yuqing Guan
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Ziang Li
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yawei Jiang
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Kaibiao Xu
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Suyue Pan
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
- Suyue Pan,
| | - Yafang Hu
- Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, China
- *Correspondence: Yafang Hu,
| |
Collapse
|
12
|
Geroldi A, Trevisan L, Gaudio A, Gotta F, Patrone S, Origone P, Grandis M, Gemelli C, Schenone A, Accogli A, Zara F, Mandich P, Bellone E. A misleading presentation of Mohr-Tranebjaerg syndrome: What is hidden behind an axonal neuropathy? Parkinsonism Relat Disord 2022; 102:54-56. [PMID: 35947939 DOI: 10.1016/j.parkreldis.2022.07.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/21/2022] [Accepted: 07/24/2022] [Indexed: 11/25/2022]
Affiliation(s)
- Alessandro Geroldi
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy.
| | - Lucia Trevisan
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy; IRCCS Ospedale Policlinico San Martino - UOC Genetica Medica, Largo R. Benzi 10, 16132, Genova, Italy.
| | - Andrea Gaudio
- IRCCS Ospedale Policlinico San Martino - UOC Genetica Medica, Largo R. Benzi 10, 16132, Genova, Italy.
| | - Fabio Gotta
- IRCCS Ospedale Policlinico San Martino - UOC Genetica Medica, Largo R. Benzi 10, 16132, Genova, Italy.
| | - Serena Patrone
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy.
| | - Paola Origone
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy; IRCCS Ospedale Policlinico San Martino - UOC Genetica Medica, Largo R. Benzi 10, 16132, Genova, Italy.
| | - Marina Grandis
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy; IRCCS-Ospedale Policlinico San Martino - UOC Clinica Neurologica, Largo R. Benzi 10, 16132, Genova, Italy.
| | - Chiara Gemelli
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy.
| | - Angelo Schenone
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy; IRCCS-Ospedale Policlinico San Martino - UOC Clinica Neurologica, Largo R. Benzi 10, 16132, Genova, Italy.
| | - Andrea Accogli
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy; IRCCS Ospedale Policlinico San Martino - UOC Genetica Medica, Largo R. Benzi 10, 16132, Genova, Italy.
| | - Federico Zara
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy; IRCCS Istituto Giannina Gaslini - UOC Genetica Medica, Via Gerolamo Gaslini 5, 16147, Genova, Italy.
| | - Paola Mandich
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy; IRCCS Ospedale Policlinico San Martino - UOC Genetica Medica, Largo R. Benzi 10, 16132, Genova, Italy.
| | - Emilia Bellone
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Largo P. Daneo 3, 16132, Genova, Italy; IRCCS Ospedale Policlinico San Martino - UOC Genetica Medica, Largo R. Benzi 10, 16132, Genova, Italy.
| |
Collapse
|
13
|
Song P, Guan Y, Chen X, Wu C, Qiao A, Jiang H, Li Q, Huang Y, Huang W, Xu M, Niemtiah O, Yuan C, Li W, Zhou L, Xiao Z, Pan S, Hu Y. Frameshift mutation of Timm8a1 gene in mouse leads to an abnormal mitochondrial structure in the brain, correlating with hearing and memory impairment. J Med Genet 2020; 58:619-627. [PMID: 32820032 DOI: 10.1136/jmedgenet-2020-106925] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 06/12/2020] [Accepted: 07/05/2020] [Indexed: 01/02/2023]
Abstract
BACKGROUND Deafness-dystonia-optic neuronopathy (DDON) syndrome is a progressive X-linked recessive disorder characterised by deafness, dystonia, ataxia and reduced visual acuity. The causative gene deafness/dystonia protein 1 (DDP1)/translocase of the inner membrane 8A (TIMM8A) encodes a mitochondrial intermembrane space chaperon. The molecular mechanism of DDON remains unclear, and detailed information on animal models has not been reported yet. METHODS AND RESULTS We characterized a family with DDON syndrome, in which the affected members carried a novel hemizygous variation in the DDP1 gene (NM_004085.3, c.82C>T, p.Q28X). We then generated a mouse line with the hemizygous mutation (p.I23fs49X) in the Timm8a1 gene using the clustered regularly interspaced short palindromic repeats /Cas9 technology. The deficient DDP1 protein was confirmed by western blot assay. Electron microscopic analysis of brain samples from the mutant mice indicated abnormal mitochondrial structure in several brain areas. However, Timm8a1 I23fs49X/y mutation did not affect the import of mitochondria inner member protein Tim23 and outer member protein Tom40 as well as the biogenesis of the proteins in the mitochondrial oxidative phosphorylation system and the manganese superoxide dismutase (MnSOD / SOD-2). The male mice with Timm8a1 I23fs49X/y mutant exhibited less weight gain, hearing impairment and cognitive deficit. CONCLUSION Our study suggests that frameshift mutation of the Timm8a1 gene in mice leads to an abnormal mitochondrial structure in the brain, correlating with hearing and memory impairment. Taken together, we have successfully generated a mouse model bearing loss-of-function mutation in Timm8a1.
Collapse
Affiliation(s)
- Pingping Song
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Neurology and Stroke Center, The First Affiliated Hospital, Jinan University, Guangzhou, Guangdong, China
| | - Yuqing Guan
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Xia Chen
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Chaochen Wu
- Physiology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - An Qiao
- Physiology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Haishan Jiang
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Qi Li
- Otolaryngology-Head and Neck Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Yingwei Huang
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Wei Huang
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Neurology, Shunde Hospital, Southern Medical University, Foshan, Guangdong, China
| | - Miaojing Xu
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Neurology, the First Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Ouattara Niemtiah
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Chao Yuan
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Wei Li
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Liang Zhou
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Zhongju Xiao
- Physiology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Suyue Pan
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Yafang Hu
- Neurology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| |
Collapse
|
14
|
Neighbors A, Moss T, Holloway L, Yu SH, Annese F, Skinner S, Saneto R, Steet R. Functional analysis of a novel mutation in the TIMM8A gene that causes deafness-dystonia-optic neuronopathy syndrome. Mol Genet Genomic Med 2020; 8:e1121. [PMID: 31903733 PMCID: PMC7057109 DOI: 10.1002/mgg3.1121] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 12/20/2019] [Accepted: 12/23/2019] [Indexed: 12/19/2022] Open
Abstract
Background The rare, X‐linked neurodegenerative disorder, Mohr–Tranebjaerg syndrome (also called deafness‐dystonia‐optic neuronopathy [DDON] syndrome), is caused by mutations in the TIMM8A gene. DDON syndrome is characterized by dystonia, early‐onset deafness, and various other neurological manifestations. The TIMM8A gene product localizes to the intermembrane space in mitochondria where it functions in the import of nuclear‐encoded proteins into the mitochondrial inner membrane. Frameshifts or premature stops represent the majority of mutations in TIMM8A that cause DDON syndrome. However, missense mutations have also been reported that result in loss of the TIMM8A gene product. Methods We report a novel TIMM8A variant in a patient with DDON syndrome that alters the initiation codon and employed functional analyses to determine the significance of the variant and its impact on mitochondrial morphology. Results The novel base change in the TIMM8A gene (c.1A>T, p.Met1Leu) results in no detectable protein and a reduction in TIMM8A transcript abundance. We observed a commensurate decrease in the steady‐state level of the Tim13 protein (the binding partner of Tim8a) but no decrease in TIMM13 transcripts. Patient fibroblasts exhibited elongation and/or increased fusion of mitochondria, consistent with prior reports. Conclusion This case expands the spectrum of mutations that cause DDON syndrome and demonstrates effects on mitochondrial morphology that are consistent with prior reports.
Collapse
Affiliation(s)
- Addison Neighbors
- Greenwood Genetic Center, Greenwood, SC, USA.,University of South Carolina School of Medicine, Columbia, SC, USA
| | - Tonya Moss
- Greenwood Genetic Center, Greenwood, SC, USA
| | | | - Seok-Ho Yu
- Greenwood Genetic Center, Greenwood, SC, USA
| | - Fran Annese
- Greenwood Genetic Center, Greenwood, SC, USA
| | | | - Russell Saneto
- Program for Mitochondrial Medicine and Metabolism, Division of Pediatric Neurology, Neuroscience Institute, Seattle's Children's Hospital, University of Washington, Seattle, WA, USA
| | | |
Collapse
|