A1555G homoplasmic mutation from A1555G heteroplasmic mother with Pendred syndrome

Moo Kyun Park, Borum Sagong, Jong Dae Lee, Seung Hyun Bae, Byeonghyeon Lee, Kwang Shik Choi, Yeon Sik Choo, Kyu Yup Lee, Un Kyung Kim

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Hearing loss (HL) is genetically heterogeneous and can be caused by mutations in multiple gene lesions. Pendred syndrome, caused by mutation of SLC26A4, is one of the common causes of recessive syndromic profound HL. Mitochondrial mutation is another rare cause of genetic HL, resulting in late onset sensorineural HL. Recently, we evaluated a young woman representing bilateral progressive moderate HL with delayed language development, along with her family. Hearing test, temporal bone computed tomography, and genetic evaluation of GJB2, MT-RNR1, SLC26A4 gene mutations were performed on each family member. Her mother was prelingually deaf and displayed enlarged vestibular aqueduct (EVA) along with goiter. Interestingly, subject's mother showed both SLC26A4 mutation and mitochondrial A1555G heteroplasmic mutation at the same time. The sisters did not display EVA or goiter. Although the subject's older sister showed both prelingual deafness and mitochondrial A1555G heteroplasmy, her younger sister showed only A1555G homoplasmy, which suggests A1555G homoplasmy as the genetic cause of hearing loss. This is the first report of HL caused by mitochondrial A1555G homoplasmy from a mother with Pendred syndrome coexistent with A1555G heteroplasmy in the Korean population.

Original languageEnglish
Pages (from-to)1996-1999
Number of pages4
JournalInternational Journal of Pediatric Otorhinolaryngology
Volume78
Issue number11
DOIs
StatePublished - 1 Nov 2014

Keywords

  • A1555G
  • Hearing loss
  • Heteroplasmy
  • MT-RNR1
  • Pendred syndrome
  • SLC26A4

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