Audiologic presentation of enlargement of the vestibular aqueduct according to the SLC26A4 genotypes

Yoon Chan Rah, Ah R. Kim, Ja Won Koo, Jun H. Lee, Seung Ha Oh, Byung Y. Choi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Objectives/Hypothesis To determine the distribution of the number and types of mutant alleles of SLC26A4 and their correlations with hearing phenotypes in Korean bilateral enlargement of vestibular aqueduct (EVA) patients. Study Design Prospective cohort study. Methods To determine the number and type of mutant alleles, Sanger sequencing of coding region of SLC26A4 was performed for 56 patients with bilateral EVA who were consecutively recruited. Their correlations with hearing phenotypes were analyzed based on 0.5-, 1-, 2-, and 3-kHz air conduction averages of pure-tone audiometry. Results Most patients with bilateral EVA (83.9%) carried two mutant alleles of SLC26A4 (M2), and all others (16.1%) had only one detectable mutant allele of SLC26A4 (M1) in the Korean population. There were no cases with zero mutations. p.H723R/p.H723R was the most frequently observed mutant allelic pair (34%), followed by p.H723R/c.919-2A>G (20%). There was no significant difference in hearing threshold, progression, or fluctuation of hearing level between the M1 and M2 groups. However, focusing on the type of mutations exclusively in the M2 group, cases with p.H723R/c.919-2A>G were associated with more frequent progression of hearing loss during the follow-up period. The cases with p.H723R/c.919-2A>G tended to show slightly better hearing than p.H723R homozygotes, although the difference was not statistically significant. There appears to be a different genotype-auditory phenotype correlation among ethnicities. Conclusions Our data suggest that the auditory phenotype of Korean bilateral EVA patients is more strongly correlated with the type rather than the number of mutations in SLC26A4.

Original languageEnglish
Pages (from-to)E216-E222
JournalLaryngoscope
Volume125
Issue number6
DOIs
Publication statusPublished - 2015 Jun 1
Externally publishedYes

Fingerprint

Vestibular Aqueduct
Hearing
Genotype
Alleles
Phenotype
Mutation
Pure-Tone Audiometry
Homozygote
Genetic Association Studies
Hearing Loss
Cohort Studies
Air
Prospective Studies
Population

Keywords

  • enlarged vestibular aqueduct
  • hearing
  • SLC26A4

ASJC Scopus subject areas

  • Otorhinolaryngology

Cite this

Audiologic presentation of enlargement of the vestibular aqueduct according to the SLC26A4 genotypes. / Rah, Yoon Chan; Kim, Ah R.; Koo, Ja Won; Lee, Jun H.; Oh, Seung Ha; Choi, Byung Y.

In: Laryngoscope, Vol. 125, No. 6, 01.06.2015, p. E216-E222.

Research output: Contribution to journalArticle

Rah, Yoon Chan ; Kim, Ah R. ; Koo, Ja Won ; Lee, Jun H. ; Oh, Seung Ha ; Choi, Byung Y. / Audiologic presentation of enlargement of the vestibular aqueduct according to the SLC26A4 genotypes. In: Laryngoscope. 2015 ; Vol. 125, No. 6. pp. E216-E222.
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abstract = "Objectives/Hypothesis To determine the distribution of the number and types of mutant alleles of SLC26A4 and their correlations with hearing phenotypes in Korean bilateral enlargement of vestibular aqueduct (EVA) patients. Study Design Prospective cohort study. Methods To determine the number and type of mutant alleles, Sanger sequencing of coding region of SLC26A4 was performed for 56 patients with bilateral EVA who were consecutively recruited. Their correlations with hearing phenotypes were analyzed based on 0.5-, 1-, 2-, and 3-kHz air conduction averages of pure-tone audiometry. Results Most patients with bilateral EVA (83.9{\%}) carried two mutant alleles of SLC26A4 (M2), and all others (16.1{\%}) had only one detectable mutant allele of SLC26A4 (M1) in the Korean population. There were no cases with zero mutations. p.H723R/p.H723R was the most frequently observed mutant allelic pair (34{\%}), followed by p.H723R/c.919-2A>G (20{\%}). There was no significant difference in hearing threshold, progression, or fluctuation of hearing level between the M1 and M2 groups. However, focusing on the type of mutations exclusively in the M2 group, cases with p.H723R/c.919-2A>G were associated with more frequent progression of hearing loss during the follow-up period. The cases with p.H723R/c.919-2A>G tended to show slightly better hearing than p.H723R homozygotes, although the difference was not statistically significant. There appears to be a different genotype-auditory phenotype correlation among ethnicities. Conclusions Our data suggest that the auditory phenotype of Korean bilateral EVA patients is more strongly correlated with the type rather than the number of mutations in SLC26A4.",
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AU - Rah, Yoon Chan

AU - Kim, Ah R.

AU - Koo, Ja Won

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AU - Oh, Seung Ha

AU - Choi, Byung Y.

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AB - Objectives/Hypothesis To determine the distribution of the number and types of mutant alleles of SLC26A4 and their correlations with hearing phenotypes in Korean bilateral enlargement of vestibular aqueduct (EVA) patients. Study Design Prospective cohort study. Methods To determine the number and type of mutant alleles, Sanger sequencing of coding region of SLC26A4 was performed for 56 patients with bilateral EVA who were consecutively recruited. Their correlations with hearing phenotypes were analyzed based on 0.5-, 1-, 2-, and 3-kHz air conduction averages of pure-tone audiometry. Results Most patients with bilateral EVA (83.9%) carried two mutant alleles of SLC26A4 (M2), and all others (16.1%) had only one detectable mutant allele of SLC26A4 (M1) in the Korean population. There were no cases with zero mutations. p.H723R/p.H723R was the most frequently observed mutant allelic pair (34%), followed by p.H723R/c.919-2A>G (20%). There was no significant difference in hearing threshold, progression, or fluctuation of hearing level between the M1 and M2 groups. However, focusing on the type of mutations exclusively in the M2 group, cases with p.H723R/c.919-2A>G were associated with more frequent progression of hearing loss during the follow-up period. The cases with p.H723R/c.919-2A>G tended to show slightly better hearing than p.H723R homozygotes, although the difference was not statistically significant. There appears to be a different genotype-auditory phenotype correlation among ethnicities. Conclusions Our data suggest that the auditory phenotype of Korean bilateral EVA patients is more strongly correlated with the type rather than the number of mutations in SLC26A4.

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