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Zhang L, Yang JY, Wang QQ, Gao X, Wang GJ, Han MY, Kang DY, Han DY, Huang SS, Yuan YY. MPZL2-a common autosomal recessive deafness gene related to moderate sensorineural hearing loss in the Chinese population. BMC Med Genomics 2024; 17:32. [PMID: 38254107 PMCID: PMC10804618 DOI: 10.1186/s12920-023-01786-3] [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: 07/17/2023] [Accepted: 12/19/2023] [Indexed: 01/24/2024] Open
Abstract
BACKGROUND Mutations in MPZL2, the characteristic genetic etiology of autosomal recessive deafness loci 111 (DFNB111), cause non-syndromic and moderate sensorineural hearing loss. METHODS In this study, we analyzed the phenotype and genotype of eight pedigrees consisting of 10 hearing loss patients with bi-allelic pathogenic or likely pathogenic variants in MPZL2. These patients were identified from a 3272 Chinese patient cohort who underwent genetic testing. RESULTS Apart from symmetrical and moderate sensorineural hearing loss, the MPZL2-related phenotype was characterized by progressive hearing loss with variation in the onset age (congenital defect to onset at the young adult stage). We determined that in the Chinese population, the genetic load of MPZL2 defects was 0.24% (8/3272) in patients diagnosed with hearing loss and 7.02% (8/114) in patients diagnosed with hereditary moderate sensorineural hearing loss caused by STRC, OTOA, OTOG, OTOGL, TECTA, MPZL2 and others. Three known MPZL2 variants (c.220C > T (p.Gln74*), c.68delC (p.Pro23Leufs*2), c.463delG (p.Ala155Leufs*10)) and a novel start loss variant (c.3G > T (p.Met1?)) were identified. MPZL2 c.220C > T was identified as the hotspot variant in the Chinese population and even in East Asia compared with c.72delA (p.Ile24Metfs*22) in European and West Asia through allele frequency. CONCLUSIONS We concluded that apart from moderate HL, progressive HL is another character of MPZL2-related HL. No specified variant was verified for the progression of HL, the penetrance and expressivity cannot be determined yet. A novel MPZL2 variant at the start codon was identified, enriching the variant spectrum of MPZL2. The hotspot variants of MPZL2 vary in different ethnicities. This study provides valuable data for the diagnosis, prognosis evaluation and genetic counseling of patients with moderate sensorineural hearing loss related to MPZL2.
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Affiliation(s)
- Lang Zhang
- College of Otolaryngology Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, Sixth Medical Center of the PLA General Hospital, Chinese PLA Medical School, 6# Fucheng Road, Beijing, 100048, China
- State Key Lab of Hearing Science, Ministry of Education, Beijing, China
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, China
| | - Jin-Yuan Yang
- College of Otolaryngology Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, Sixth Medical Center of the PLA General Hospital, Chinese PLA Medical School, 6# Fucheng Road, Beijing, 100048, China
- State Key Lab of Hearing Science, Ministry of Education, Beijing, China
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, China
| | - Qiu-Quan Wang
- College of Otolaryngology Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, Sixth Medical Center of the PLA General Hospital, Chinese PLA Medical School, 6# Fucheng Road, Beijing, 100048, China
- State Key Lab of Hearing Science, Ministry of Education, Beijing, China
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, China
| | - Xue Gao
- Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, 16# XinWai Da Jie, 100088, Beijing, China
| | - Guo-Jian Wang
- College of Otolaryngology Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, Sixth Medical Center of the PLA General Hospital, Chinese PLA Medical School, 6# Fucheng Road, Beijing, 100048, China
- State Key Lab of Hearing Science, Ministry of Education, Beijing, China
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, China
| | - Ming-Yu Han
- College of Otolaryngology Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, Sixth Medical Center of the PLA General Hospital, Chinese PLA Medical School, 6# Fucheng Road, Beijing, 100048, China
- State Key Lab of Hearing Science, Ministry of Education, Beijing, China
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, China
| | - Dong-Yang Kang
- College of Otolaryngology Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, Sixth Medical Center of the PLA General Hospital, Chinese PLA Medical School, 6# Fucheng Road, Beijing, 100048, China
- State Key Lab of Hearing Science, Ministry of Education, Beijing, China
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, China
| | - Dong-Yi Han
- College of Otolaryngology Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, Sixth Medical Center of the PLA General Hospital, Chinese PLA Medical School, 6# Fucheng Road, Beijing, 100048, China.
- State Key Lab of Hearing Science, Ministry of Education, Beijing, China.
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, China.
| | - Sha-Sha Huang
- College of Otolaryngology Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, Sixth Medical Center of the PLA General Hospital, Chinese PLA Medical School, 6# Fucheng Road, Beijing, 100048, China.
- State Key Lab of Hearing Science, Ministry of Education, Beijing, China.
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, China.
| | - Yong-Yi Yuan
- College of Otolaryngology Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, Sixth Medical Center of the PLA General Hospital, Chinese PLA Medical School, 6# Fucheng Road, Beijing, 100048, China.
- State Key Lab of Hearing Science, Ministry of Education, Beijing, China.
- Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, China.
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Zhang Q, Qin T, Hu W, Janjua MU, Jin P. Putative Digenic GJB2/MYO7A Inheritance of Hearing Loss Detected in a Patient with 48,XXYY Klinefelter Syndrome. Hum Hered 2021; 85:117-124. [PMID: 34192699 DOI: 10.1159/000516854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 04/01/2021] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVES Nonsyndromic hearing loss (NSHL) is the most frequent type of hereditary hearing impairment. Here, we explored the underlying genetic cause of NSHL in a three-generation family using whole-exome sequencing. The proband had concomitant NSHL and rare 48,XXYY Klinefelter syndrome. MATERIAL AND METHODS Genomic DNA was extracted from the peripheral blood of the proband and their family members. Sanger sequencing and pedigree verification were performed on the pathogenic variants filtered by whole-exome sequencing. The function of the variants was analyzed using bioinformatics software. RESULTS The proband was digenic heterozygous for p.V37I in the GJB2 gene and p.L347I in the MYO7A gene. The proband's mother had normal hearing and did not have any variant. The proband's father and uncle both had NSHL and were compound for the GJB2 p.V37I and MYO7A p.L347I variants, thus indicating a possible GJB2/MYO7A digenic inheritance of NSHL. 48,XXYY Klinefelter syndrome was discovered in the proband after the karyotype analysis, while his parents both had normal karyotypes. CONCLUSIONS Our findings reported a putative GJB2/MYO7A digenic inheritance form of hearing loss, expanding the genotype and phenotype spectrum of NSHL. In addition, this is the first report of concomitant NSHL and 48,XXYY syndrome.
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Affiliation(s)
- Qin Zhang
- Department of Endocrinology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Tiantian Qin
- Department of Endocrinology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Wenmu Hu
- Department of Endocrinology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Muhammad Usman Janjua
- Department of Endocrinology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Ping Jin
- Department of Endocrinology, The Third Xiangya Hospital, Central South University, Changsha, China
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Prelingual Sensorineural Hearing Loss Caused by a Novel GJB2 Dominant Mutation in a Chinese Family. BIOMED RESEARCH INTERNATIONAL 2020; 2020:6370386. [PMID: 32090102 PMCID: PMC6996670 DOI: 10.1155/2020/6370386] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 12/19/2019] [Accepted: 12/30/2019] [Indexed: 11/17/2022]
Abstract
Background GJB2 mutation is the most common cause of genetic deafness. Many pathogenic variations have already been identified, and thus, fewer and fewer novel pathogenic variations remain to be identified. Here, we describe a novel pathogenic variation associated with dominant hereditary deafness in a Chinese family. Methods In this study, we examined four generations of a Chinese family (M127) with hearing loss. Temporal CT scan, complete physical examination (including skin and hair), and audiological tests were performed. Targeted next-generation and Sanger sequencing were used to identify pathogenic mutations in affected individuals. Results All patients exhibited prelingual nonsyndromic sensorineural hearing loss, with severity ranging from moderate to severe. A novel dominant pathogenic variant c.205T > C (p.Phe69Leu) was identified in all patients in this family. Conclusions c.205T > C (p.Phe69Leu) was identified as a novel dominant pathogenic variant of GJB2 associated with prelingual nonsyndromic sensorineural hearing loss.GJB2 mutation is the most common cause of genetic deafness. Many pathogenic variations have already been identified, and thus, fewer and fewer novel pathogenic variations remain to be identified. Here, we describe a novel pathogenic variation associated with dominant hereditary deafness in a Chinese family.
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