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Revertant mutation releases confined lethal mutation, opening Pandora's box: a novel genetic pathogenesis.
Ogawa, Yasushi; Takeichi, Takuya; Kono, Michihiro; Hamajima, Nobuyuki; Yamamoto, Toshimichi; Sugiura, Kazumitsu; Akiyama, Masashi.
Afiliación
  • Ogawa Y; Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
  • Takeichi T; Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
  • Kono M; Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
  • Hamajima N; Department of Healthcare Administration, Nagoya University Graduate School of Medicine, Nagoya, Japan.
  • Yamamoto T; Department of Legal Medicine and Bioethics, Nagoya University Graduate School of Medicine, Nagoya, Japan.
  • Sugiura K; Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
  • Akiyama M; Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
PLoS Genet ; 10(5): e1004276, 2014 May.
Article en En | MEDLINE | ID: mdl-24785414
When two mutations, one dominant pathogenic and the other "confining" nonsense, coexist in the same allele, theoretically, reversion of the latter may elicit a disease, like the opening of Pandora's box. However, cases of this hypothetical pathogenic mechanism have never been reported. We describe a lethal form of keratitis-ichthyosis-deafness (KID) syndrome caused by the reversion of the GJB2 nonsense mutation p.Tyr136X that would otherwise have confined the effect of another dominant lethal mutation, p.Gly45Glu, in the same allele. The patient's mother had the identical misssense mutation which was confined by the nonsense mutation. The biological relationship between the parents and the child was confirmed by genotyping of 15 short tandem repeat loci. Haplotype analysis using 40 SNPs spanning the >39 kbp region surrounding the GJB2 gene and an extended SNP microarray analysis spanning 83,483 SNPs throughout chromosome 13 in the family showed that an allelic recombination event involving the maternal allele carrying the mutations generated the pathogenic allele unique to the patient, although the possibility of coincidental accumulation of spontaneous point mutations cannot be completely excluded. Previous reports and our mutation screening support that p.Gly45Glu is in complete linkage disequilibrium with p.Tyr136X in the Japanese population. Estimated from statisitics in the literature, there may be approximately 11,000 p.Gly45Glu carriers in the Japanese population who have this second-site confining mutation, which acts as natural genetic protection from the lethal disease. The reversion-triggered onset of the disesase shown in this study is a previously unreported genetic pathogenesis based on Mendelian inheritance.
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Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Codón sin Sentido / Genes Letales Tipo de estudio: Etiology_studies Límite: Humans Idioma: En Revista: PLoS Genet Asunto de la revista: GENETICA Año: 2014 Tipo del documento: Article País de afiliación: Japón

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Codón sin Sentido / Genes Letales Tipo de estudio: Etiology_studies Límite: Humans Idioma: En Revista: PLoS Genet Asunto de la revista: GENETICA Año: 2014 Tipo del documento: Article País de afiliación: Japón