Exploration of molecular genetic etiology for Korean cochlear implantees with severe to profound hearing loss and its implication

Orphanet Journal of Rare Diseases

Byung Yoon Choi⁷  Woong-Yang Park⁵  Jae-Yong Nam²  Ja-Won Koo⁷  Seung Ha Oh³  Jihye Rhee⁶  Ah Reum Kim⁶  Nayoung K D Kim⁴  Joo Hyun Park¹ 

[1] Department of Otorhinolaryngology-Head and Neck Surgery, Dongguk University Ilsan Hospital, Goyang, Korea;Samsung Advanced Institute for Health Sciences and Technology, Seoul, Korea;Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, Korea;Samsung Genome Institute, Samsung Medical Center, Seoul, Korea;Department of Molecular Cell Biology, School of Medicine, Sungkyunkwan University, Seoul, Korea;Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, Korea;Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, College of Medicine, Seoul National University, Seongnam-si, Bundang-gu, Korea

关键词: Targeted resequencing;    Deafness;    Cochlear implantation;    Molecular genetic test;   

Others  :  1149457
DOI  :  10.1186/s13023-014-0167-8

 received in 2014-05-26, accepted in 2014-10-17,  发布年份 2014

【 摘 要 】

Background

Severe to profound sensorineural hearing loss (SNHL) requires cochlear implantation (CI) for auditory rehabilitation. Etiologic diagnoses can contribute to candidacy selection and decision-making regarding the timing of successful CI. However, few studies have been performed to address the etiologic spectrum of severe SNHL in the population where there is no consanguineous marriage and the majority of SNHL cases are sporadic in small sized families. The authors sought to comprehensively understand the etiologies of Korean cochlear implantees by incorporating the targeted resequencing of 204 candidate deafness genes (TRS-204) and a phenotype-driven candidate gene approach.

Methods

Ninety-three that consented to molecular genetic testing and underwent at least one molecular genetic test were included. Patients with a characteristic Phenotypic marker were subject to Sanger sequencing to detect variants in corresponding candidate genes. The rest of patients without any prominent phenotype were tested on GJB2. Next, TRS-204 was applied in GJB2-negative cases without any phenotypic marker. In addition, the sibling recurrence-risk of SNHL among families with non-diagnostic genotypes after TRS-204 was performed to gain insight of etiologies in non-diagnostic cases.

Results

Overall, we could find causative variants in 51 (54.8%) of the 93 cochlear implantees. Thirty (32.3%) probands could be diagnosed by direct Sanger sequencing of candidate genes selected by their phenotypes. GJB2 sequencing added 10 subjects to the group with a diagnostic genotype. TRS-204 could detect a causative variant from additional 11 cases (11.8%). We could not detect any pathogenic deletion or duplication on 204 target genes. The sibling recurrence-risk of SNHL among 42 genetically undiagnosed families with 0.03 (1/38) was significantly lower than among genetically diagnosed recessive families with 0.19 (7/37).

Conclusion

Despite that the majority of severe or more degree of SNHL occurs sporadically in Koreans, at least 54.8% of such cases that were willing to join the genetic study in the Korean population are monogenic Mendelian disorders with convincing causative variants. This study also indicates that a substantial portion of unsolved cases after applying our current protocol are predicted to have non-genetic or complex etiology rather than a Mendelian genetic disorder involving new genes beyond the 204 target genes.

【 授权许可】

   
2014 Park et al.; licensee BioMed Central Ltd.

【 图 表 】

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