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Mitochondrial hearing loss mutations among Finnish preterm and term-born infants

Heidi K. Soini, Minna K. Karjalainen, Reetta Hinttala, Arja Rautio, Mikko Hallman, Johanna Uusimaa
  • Heidi K. Soini http://orcid.org/0000-0002-7056-2485
    The Research Unit of Pediatrics, Pediatric Neurology, Pediatric Surgery, Child Psychiatry, Dermatology, Clinical Genetics and Obstetrics and Gynecology, Otorhinolaryngology and Ophthalmology (PEDEGO), University of Oulu; Medical Research Center, University of Oulu and Oulu University Hospital, Oulu; Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland | heidi.soini@oulu.fi
  • Minna K. Karjalainen
    The Research Unit of Pediatrics, Pediatric Neurology, Pediatric Surgery, Child Psychiatry, Dermatology, Clinical Genetics and Obstetrics and Gynecology, Otorhinolaryngology and Ophthalmology (PEDEGO), University of Oulu; Medical Research Center, University of Oulu and Oulu University Hospital, Oulu; Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland
  • Reetta Hinttala
    The Research Unit of Pediatrics, Pediatric Neurology, Pediatric Surgery, Child Psychiatry, Dermatology, Clinical Genetics and Obstetrics and Gynecology, Otorhinolaryngology and Ophthalmology (PEDEGO), University of Oulu; Medical Research Center, University of Oulu and Oulu University Hospital, Oulu; Department of Children and Adolescents, Oulu University Hospital, Oulu; Biocenter Oulu, Oulu University, Oulu, Finland
  • Arja Rautio
    Faculty of Medicine, Arctic Health and Thule Institute, University of Oulu, Finland
  • Mikko Hallman
    The Research Unit of Pediatrics, Pediatric Neurology, Pediatric Surgery, Child Psychiatry, Dermatology, Clinical Genetics and Obstetrics and Gynecology, Otorhinolaryngology and Ophthalmology (PEDEGO), University of Oulu; Medical Research Center, University of Oulu and Oulu University Hospital, Oulu; Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland
  • Johanna Uusimaa
    The Research Unit of Pediatrics, Pediatric Neurology, Pediatric Surgery, Child Psychiatry, Dermatology, Clinical Genetics and Obstetrics and Gynecology, Otorhinolaryngology and Ophthalmology (PEDEGO), University of Oulu; Medical Research Center, University of Oulu and Oulu University Hospital, Oulu; Department of Children and Adolescents, Oulu University Hospital, Oulu; Biocenter Oulu, Oulu University, Oulu, Finland

Abstract

Mitochondrial ribosomal 12S subunit gene (MTRNR1) is a hot spot for hearing loss mutations. Mutations such as m.1555A>G, m.1494C>T and m.1095C>T, cause sensitivity to aminoglycosides. Aminoglycoside treatment induces permanent hearing loss or deafness in the carriers and should therefore be avoided. The prevalence of these sensitivity mutations varies in different countries and populations. Over 90% of preterm children need aminoglycoside treatment during their first weeks of life. Infants who carry a mitochondrial sensitivity mutation can develop a life-long sensorineural hearing impairment as a side-effect of aminoglycoside treatment. Total of 813 Finnish preterm (born G, m.1494T>C and m.1095C>T mutations. The population prevalence of m.1555A>G was determined to be 0.12% in Finland. M.1494C>T and m.1095C>T mutations were absent. Out of the 813 infants, a term-born infant was found to harbor m.1555A>G at 81% heteroplasmy, while his mother’s heteroplasmy was 68%. Both had normal hearing and had not received aminoglycosides. Mothers with a family history of hearing loss who are at risk of preterm labor would benefit from antenatal genotyping of m.1555A>G mutation. The prevalence of m.1555A>G in Finns was close to other European countries. M.1494C>T and m.1095C>T mutations either do not occur in the Finnish population or they are very rare. This study highlights the importance of population-specific genotyping of MTRNR1 aminoglycoside sensitivity mutations, especially in countries with liberal aminoglycoside use.

Keywords

Mitochondrial DNA; mtDNA; m.1555A>G; m.1494C>T; m.1095C>T; MTRNR1; aminoglycoside; preterm; infant; sensorineural hearing loss.

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Submitted: 2017-08-16 13:48:27
Published: 2017-11-03 11:49:31
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Copyright (c) 2017 Heidi K. Soini, Minna K. Karjalainen, Reetta Hinttala, Arja Rautio, Mikko Hallman, Johanna Uusimaa

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