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A meta-analysis of single base-pair substitutions in translational termination codons ('nonstop' mutations) that cause human inherited disease.
Hamby, Stephen E; Thomas, Nick S T; Cooper, David N; Chuzhanova, Nadia.
Afiliação
  • Hamby SE; School of Science and Technology, Nottingham Trent University, UK.
Hum Genomics ; 5(4): 241-64, 2011 May.
Article em En | MEDLINE | ID: mdl-21712188
ABSTRACT
'Nonstop' mutations are single base-pair substitutions that occur within translational termination (stop) codons and which can lead to the continued and inappropriate translation of the mRNA into the 3'-untranslated region. We have performed a meta-analysis of the 119 nonstop mutations (in 87 different genes) known to cause human inherited disease, examining the sequence context of the mutated stop codons and the average distance to the next alternative in-frame stop codon downstream, in comparison with their counterparts from control (non-mutated) gene sequences. A paucity of alternative in-frame stop codons was noted in the immediate vicinity (0-49 nucleotides downstream) of the mutated stop codons as compared with their control counterparts (p = 7.81 × 10-4). This implies that at least some nonstop mutations with alternative stop codons in close proximity will not have come to clinical attention, possibly because they will have given rise to stable mRNAs (not subject to nonstop mRNA decay) that are translatable into proteins of near-normal length and biological function. A significant excess of downstream in-frame stop codons was, however, noted in the range 150-199 nucleotides from the mutated stop codon (p = 8.55 × 10-4). We speculate that recruitment of an alternative stop codon at greater distance from the mutated stop codon may trigger nonstop mRNA decay, thereby decreasing the amount of protein product and yielding a readily discernible clinical phenotype. Confirmation or otherwise of this postulate must await the emergence of a clearer understanding of the mechanism of nonstop mRNA decay in mammalian cells.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Mutação Puntual / Códon de Terminação / Doenças Genéticas Inatas Tipo de estudo: Systematic_reviews Limite: Humans Idioma: En Ano de publicação: 2011 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Mutação Puntual / Códon de Terminação / Doenças Genéticas Inatas Tipo de estudo: Systematic_reviews Limite: Humans Idioma: En Ano de publicação: 2011 Tipo de documento: Article