title: Novel human mitochondrial tRNA phe mutation in a patient with hearing impairment: a case study.
abstract: We present a patient with non-syndromic and sensorineural hearing impairment with a novel mitochondrial DNA transition. A 7-year-old boy showed progressive deafness. He gradually lost his hearing ability and his hearing function did not improve with hearing aids. Laboratory data revealed normal blood lactate and pyruvate levels. Genetic analyses for mitochondrial DNA and GJB2 and GJB6 genes were performed. Mitochondrial genes analysis revealed a novel heteroplasmic nucleotide substitution, m.628C>T, in the phenylalanine transfer RNA gene. This case study reveals m.628C>T transition as a novel mitochondrial nucleotide change which may be important in mitochondrial deafness.
authors.affiliation: Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Dowlati
authors.forename: Pupak
authors.initials: P
authors.lastname: Derakhshandeh-Peykar
authors.forename: Massoud
authors.initials: M
authors.lastname: Houshmand
authors.forename: Mohammad
authors.initials: M
authors.lastname: Farhadi
authors.forename: Azadeh
authors.initials: A
authors.lastname: Shojaei
authors.forename: Javad Tavakkoly
authors.initials: JT
authors.lastname: Bazzaz
mesh_terms: D002648:Child; D000072259:Connexin 26; D017630:Connexins; D004272:DNA, Mitochondrial / Q000235:genetics*; D034381:Hearing Loss / Q000235:genetics*; D006801:Humans; D008297:Male; D009154:Mutation; D012360:RNA, Transfer, Phe / Q000235:genetics*
chemical_list: D017630:Connexins; D004272:DNA, Mitochondrial; C000607042:GJB2 protein, human; D012360:RNA, Transfer, Phe; D000072259:Connexin 26