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Zhao M, Luo X, Zhao Q, Yang T, Zhang W, Chen Z, Zeng S, Chen W, Zhang H, Wang Q, Wang W, Zhang X, Zhong T. Characteristics of hearing loss-associated gene mutations: A multi-center study of 119,606 neonates in Gannan. Int J Pediatr Otorhinolaryngol 2023; 174:111744. [PMID: 37801830 DOI: 10.1016/j.ijporl.2023.111744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 09/23/2023] [Accepted: 09/25/2023] [Indexed: 10/08/2023]
Abstract
BACKGROUND HL is the second most common congenital disability in China, and its high incidence brings a serious burden of medical and educational sequelae. HL genetic screening enables the identification of individuals with inherited HL and carriers in a large scale. OBJECTIVE This study aimed to measure the detection rates of hearing loss (HL)-associated gene mutations in the Gannan population. The molecular etiology and risk factors of hereditary HL were also analyzed. METHODS In total, 119,606 newborns from 18 districts of Gannan were enrolled in this multi-center study conducted between April 2019 and April 2021. Otoacoustic Emission (OAE) was used for primary hearing screening 3 days after birth in quiet conditions, and OAE combined with automated auditory brainstem response (AABR) was applied 29-42 days after birth for those who failed or missed the initial screening. Meanwhile, high-throughput sequencing of hotspot HL-associated mutations in GJB2, GJB3, MTRNR1, and SLC26A4 were performed. RESULTS Among the 119,606 newborns, 7796 (6.52%) failed the hearing screening. Genetic screening revealed that 5092 neonates (4.26%) carried HL-associated mutations. The detection rate of GJB2, SLC26A4, MTRNR1 and GJB3 mutations were 2.09%, 1.51%, 0.42% and 0.24%, respectively. The most prevalent variant was GJB2 c.235delC (1.74%). The second most prevalent variant was SLC26A4 c.919-2A > G (0.93%). The population who failed the hearing screening had a lower proportion (24.64%) of SLC26A4 gene variants compared to the population who passed (37.46%). Genetic screening identified 4612 (3.86%) carriers who were normal in hearing screenings. The concurrent hearing and genetic screening identified 480 (0.40%) neonates at high risk for hereditary HL. CONCLUSIONS The results of this study suggest that the concurrent hearing screening and high-throughput genetic screening would greatly improve the effectiveness of newborn HL programs. This integration also facilitates the management of congenital HL, and aids in the prevention of aminoglycoside antibiotics-induced HL.
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Affiliation(s)
- Minghong Zhao
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China; Laboratory Medicine, Guizhou Aerospace Hospital, Zunyi, China
| | - Xuemei Luo
- Ganzhou Municipal Health Commission, Ganzhou, China
| | - Qinfei Zhao
- Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Tong Yang
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Wenqian Zhang
- BGI Genomics, Shenzhen, China; Clin Lab, BGI Genomics, Wuhan, China
| | - Zhigang Chen
- BGI Genomics, Shenzhen, China; Clin Lab, BGI Genomics, Wuhan, China
| | - Shaoying Zeng
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Weifeng Chen
- Department of Otorhinolaryngology Head and Neck Surgery, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Huijuan Zhang
- Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Qi Wang
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China
| | - Weihua Wang
- Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Xiaokang Zhang
- School of Public Health and Health Management, Gannan Medical University, Ganzhou, China.
| | - Tianyu Zhong
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China.
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Analysis of SLC26A4, FOXI1, and KCNJ10 Gene Variants in Patients with Incomplete Partition of the Cochlea and Enlarged Vestibular Aqueduct (EVA) Anomalies. Int J Mol Sci 2022; 23:ijms232315372. [PMID: 36499699 PMCID: PMC9740095 DOI: 10.3390/ijms232315372] [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: 09/20/2022] [Revised: 11/29/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022] Open
Abstract
Pathogenic variants in the SLC26A4, FOXI1, and KCNJ10 genes are associated with hearing loss (HL) and specific inner ear abnormalities (DFNB4). In the present study, phenotype analyses, including clinical data collection, computed tomography (CT), and audiometric examination, were performed on deaf individuals from the Sakha Republic of Russia (Eastern Siberia). In cases with cochleovestibular malformations, molecular genetic analysis of the coding regions of the SLC26A4, FOXI1, and KCNJ10 genes associated with DFNB4 was completed. In six of the 165 patients (3.6%), CT scans revealed an incomplete partition of the cochlea (IP-1 and IP-2), in isolation or combined with an enlarged vestibular aqueduct (EVA) anomaly. Sequencing of the SLC26A4, FOXI1, and KCNJ10 genes was performed in these six patients. In the SLC26A4 gene, we identified four variants, namely c.85G>C p.(Glu29Gln), c.757A>G p.(Ile253Val), c.2027T>A p.(Leu676Gln), and c.2089+1G>A (IVS18+1G>A), which are known as pathogenic, as well as c.441G>A p.(Met147Ile), reported previously as a variant with uncertain significance. Using the AlphaFold algorithm, we found in silico evidence of the pathogenicity of this variant. We did not find any causative variants in the FOXI1 and KCNJ10 genes, nor did we find any evidence of digenic inheritance associated with double heterozygosity for these genes with monoallelic SLC26A4 variants. The contribution of biallelic SLC26A4 variants in patients with IP-1, IP-2, IP-2+EVA, and isolated EVA was 66.7% (DFNB4 in three patients, Pendred syndrome in one patient). Seventy-five percent of SLC26A4-biallelic patients had severe or profound HL. The morphology of the inner ear anomalies demonstrated that, among SLC26A4-biallelic patients, all types of incomplete partition of the cochlea are possible, from IP-1 and IP-2, to a normal cochlea. However, the dominant type of anomaly was IP-2+EVA (50.0%). This finding is very important for cochlear implantation, since the IP-2 anomaly does not have an increased risk of “gushers” and recurrent meningitis.
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Zhao LJ, Zhang ZL, Fu Y. Novel m.4268T>C mutation in the mitochondrial tRNA Ile gene is associated with hearing loss in two Chinese families. World J Clin Cases 2022; 10:205-216. [PMID: 35071519 PMCID: PMC8727281 DOI: 10.12998/wjcc.v10.i1.205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 07/23/2021] [Accepted: 11/29/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Herein, we report the genetic, clinical, molecular and biochemical features of two Han Chinese pedigrees with suggested maternally transmitted non-syndromic hearing loss.
AIM To investigate the pathophysiology of hearing loss associated with mitochondrial tRNA mutations.
METHODS Sixteen subjects from two Chinese families with hearing loss underwent clinical, genetic, molecular, and biochemical evaluations. Biochemical characterizations included the measurements of tRNA levels using lymphoblastoid cell lines derived from five affected matrilineal relatives of these families and three control subjects.
RESULTS Three of the 16 matrilineal relatives in these families exhibited a variable seriousness and age-at-onset (8 years) of deafness. Analysis of mtDNA mutation identified the novel homoplasmic tRNAIle 4268T>C mutation in two families both belonging to haplogroup D4j. The 4268T>C mutation is located in a highly conserved base pairing (6U–67A) of tRNAIle. The elimination of 6U–67A base-pairing may change the tRNAIle metabolism. Functional mutation was supported by an approximately 64.6% reduction in the level of tRNAIle observed in the lymphoblastoid cell lines with the 4268T>C mutation, in contrast to the wild-type cell lines. The reduced level of tRNA was below the proposed threshold for normal respiration in lymphoblastoid cells. However, genotyping analysis did not detect any mutations in the prominent deafness-causing gene GJB2 in any members of the family.
CONCLUSION These data show that the novel tRNAIle 4268T>C mutation was involved in maternally transmitted deafness. However, epigenetic, other genetic, or environmental factors may be attributed to the phenotypic variability. These findings will be useful for understanding families with maternally inherited deafness.
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Affiliation(s)
- Li-Jing Zhao
- Department of Otorhinolaryngology Head and Neck Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, Zhejiang Province, China
| | - Zhi-Li Zhang
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310003, Zhejiang Province, China
| | - Yong Fu
- Department of Otorhinolaryngology Head and Neck Surgery, The Children’s Hospital, Zhejiang University School of Medicine, Hangzhou 310009, Zhejiang Province, China
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Different Rates of the SLC26A4-Related Hearing Loss in Two Indigenous Peoples of Southern Siberia (Russia). Diagnostics (Basel) 2021; 11:diagnostics11122378. [PMID: 34943614 PMCID: PMC8699871 DOI: 10.3390/diagnostics11122378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/13/2021] [Accepted: 12/13/2021] [Indexed: 12/14/2022] Open
Abstract
Hereditary hearing loss (HL) is known to be highly locus/allelic heterogeneous, and the prevalence of different HL forms significantly varies among populations worldwide. Investigation of region-specific landscapes of hereditary HL is important for local healthcare and medical genetic services. Mutations in the SLC26A4 gene leading to nonsyndromic recessive deafness (DFNB4) and Pendred syndrome are common genetic causes of hereditary HL, at least in some Asian populations. We present for the first time the results of a thorough analysis of the SLC26A4 gene by Sanger sequencing in the large cohorts of patients with HL of unknown etiology belonging to two neighboring indigenous Turkic-speaking Siberian peoples (Tuvinians and Altaians). A definite genetic diagnosis based on the presence of biallelic SLC26A4 mutations was established for 28.2% (62/220) of all enrolled Tuvinian patients vs. 4.3% (4/93) of Altaian patients. The rate of the SLC26A4-related HL in Tuvinian patients appeared to be one of the highest among populations worldwide. The SLC26A4 mutational spectrum was characterized by the presence of Asian-specific mutations c.919-2A>G and c.2027T>A (p.Leu676Gln), predominantly found in Tuvinian patients, and c.2168A>G (p.His723Arg), which was only detected in Altaian patients. In addition, a novel pathogenic variant c.1545T>G (p.Phe515Leu) was found with high frequency in Tuvinian patients. Overall, based on the findings of this study and our previous research, we were able to uncover the genetic causes of HL in 50.5% of Tuvinian patients and 34.5% of Altaian patients.
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Hu CJ, Lu YC, Tsai CY, Chan YH, Lin PH, Lee YS, Yu IS, Lin SW, Liu TC, Hsu CJ, Yang TH, Cheng YF, Wu CC. Insights into phenotypic differences between humans and mice with p.T721M and other C-terminal variants of the SLC26A4 gene. Sci Rep 2021; 11:20983. [PMID: 34697379 PMCID: PMC8545921 DOI: 10.1038/s41598-021-00448-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 09/22/2021] [Indexed: 11/17/2022] Open
Abstract
Recessive variants of the SLC26A4 gene are an important cause of hereditary hearing impairment. Several transgenic mice with different Slc26a4 variants have been generated. However, none have recapitulated the auditory phenotypes in humans. Of the SLC26A4 variants identified thus far, the p.T721M variant is of interest, as it appears to confer a more severe pathogenicity than most of the other missense variants, but milder pathogenicity than non-sense and frameshift variants. Using a genotype-driven approach, we established a knock-in mouse model homozygous for p.T721M. To verify the pathogenicity of p.T721M, we generated mice with compound heterozygous variants by intercrossing Slc26a4+/T721M mice with Slc26a4919-2A>G/919-2A>G mice, which segregated the c.919-2A > G variant with abolished Slc26a4 function. We then performed serial audiological assessments, vestibular evaluations, and inner ear morphological studies. Surprisingly, both Slc26a4T721M/T721M and Slc26a4919-2A>G/T721M showed normal audiovestibular functions and inner ear morphology, indicating that p.T721M is non-pathogenic in mice and a single p.T721M allele is sufficient to maintain normal inner ear physiology. The evidence together with previous reports on mouse models with Slc26a4 p.C565Y and p.H723R variants, support our speculation that the absence of audiovestibular phenotypes in these mouse models could be attributed to different protein structures at the C-terminus of human and mouse pendrin.
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Affiliation(s)
- Chin-Ju Hu
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan.,Program in Speech and Hearing Bioscience and Technology, Harvard Medical School, Boston, MA, 02115, USA
| | - Ying-Chang Lu
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan
| | - Cheng-Yu Tsai
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan
| | - Yen-Hui Chan
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan.,Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, 427, Taiwan
| | - Pei-Hsuan Lin
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan
| | - Yi-Shan Lee
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan
| | - I-Shing Yu
- Transgenic Mouse Models Core (TMMC), Division of Genomic Medicine, Research Center for Medical Excellence, National Taiwan University, Taipei, 100, Taiwan
| | - Shu-Wha Lin
- Transgenic Mouse Models Core (TMMC), Division of Genomic Medicine, Research Center for Medical Excellence, National Taiwan University, Taipei, 100, Taiwan
| | - Tien-Chen Liu
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan.,Department of Otolaryngology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - Chuan-Jen Hsu
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan.,Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, 427, Taiwan
| | - Ting-Hua Yang
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan.
| | - Yen-Fu Cheng
- Department of Medical Research, Taipei Veteran General Hospital, 201, Sec.2, Shi-Pai Rd, Taipei, 112, Taiwan. .,Department of Otolaryngology-Head and Neck Surgery, Taipei Veteran General Hospital, Taipei, 112, Taiwan. .,School of Medicine, National Yang Ming Chiao Tung University, Taipei, 112, Taiwan.
| | - Chen-Chi Wu
- Department of Otolaryngology, National Taiwan University Hospital, 7 Chung-Shan S. Rd., Taipei, 100, Taiwan. .,Department of Otolaryngology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan. .,Department of Medical Research, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu, 302, Taiwan.
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Qi M, Lai H, Xu L, Zeng F, Zhang J, Xie K. Pregestational screening of hereditary deafness genes carriers in 10,684 normal pregnant women in Zhuzhou, China. Birth Defects Res 2021; 113:605-612. [PMID: 33470562 DOI: 10.1002/bdr2.1868] [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: 10/15/2020] [Revised: 12/22/2020] [Accepted: 12/27/2020] [Indexed: 11/07/2022]
Abstract
BACKGROUND Mutations in genes associated with deafness differ between ethnic groups and regions in China. In this study, we investigated the genes associated with deafness in pregnant women to analyze the distribution of mutations leading to deafness in Zhuzhou, China. METHODS A total of 10,684 pregnant women were enrolled in this study. DNA samples were collected to detect the 14 common mutations in deafness genes (at 108 sites). RESULTS Prevalence of mutations in deafness genes in pregnant women with normal hearing in Zhuzhou was 4.92% (526/10,684). Among these 526 pregnant women with deafness gene mutations, the frequencies of mutated GJB2, GJB3, SLC26A4, and mtDNA 12S rRNA were 40.11, 7.22, 40.68, and 11.98%, respectively. The hotspots for mutations in the deafness genes were: c.235delC in GJB2 (31.18%), c.919-2A > G in SLC26A4 (18.44%), c.299_300delAT in GJB2 (5.70%), m.7444G > A in mtDNA 12S rRNA (5.70%), c.1229C > T in SLC26A4 (5.51%), m.1555A > G in mtDNA 12S rRNA (5.32%), accounting for 71.85%. Moreover, husbands of the 526 pregnant women who carried the deafness gene mutations were also included in the analysis to detect deafness gene mutations. Among the 526 husbands, 23 husbands carried mutations in deafness genes, accounting for 4.37%. The deafness gene mutations of the husbands and pregnant wives were not the same. In addition, the results of the neonatal follow-up hearing tests were all normal. CONCLUSION Our study identified the prevalence of mutations in GJB2, SLC26A4, mtDNA 12S rRNA, and GJB3 genes in pregnant women from Zhuzhou, China.
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Affiliation(s)
- Mingming Qi
- Department of Obstetrics, Zhuzhou Central Hospital and The Affiliated Zhuzhou Hospital Xiangya Medical College CSU, Zhuzhou, China
| | - Huimin Lai
- Department of Obstetrics, Zhuzhou Central Hospital and The Affiliated Zhuzhou Hospital Xiangya Medical College CSU, Zhuzhou, China
| | - Lili Xu
- Department of Obstetrics, Zhuzhou Central Hospital and The Affiliated Zhuzhou Hospital Xiangya Medical College CSU, Zhuzhou, China
| | - Fanhua Zeng
- Department of Obstetrics, Zhuzhou Central Hospital and The Affiliated Zhuzhou Hospital Xiangya Medical College CSU, Zhuzhou, China
| | - Jing Zhang
- Department of Obstetrics, Zhuzhou Central Hospital and The Affiliated Zhuzhou Hospital Xiangya Medical College CSU, Zhuzhou, China
| | - Kaili Xie
- Department of Obstetrics, Zhuzhou Central Hospital and The Affiliated Zhuzhou Hospital Xiangya Medical College CSU, Zhuzhou, China
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Genetic analysis of SLC26A4 gene (pendrin) related deafness among a cohort of assortative mating families from southern India. Eur Arch Otorhinolaryngol 2020; 277:3021-3035. [DOI: 10.1007/s00405-020-06026-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2020] [Accepted: 04/27/2020] [Indexed: 10/24/2022]
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