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- W1484612773 abstract "Nonsense mutations are single nucleotide variations within the coding sequence of a gene that result in a premature termination codon (PTC). The occurrence of such PTCs most often leads to a complete loss of protein function and a reduction in messenger ribonucleic acid (mRNA) levels due to the nonsense-mediated mRNA decay (NMD), a cellular surveillance mechanism that triggers selective degradation of mutant transcripts. Therapeutic approaches to circumvent the consequences of nonsense mutations may act at different levels: (1) the genomic deoxyribonucleic acid (DNA) by replacing the defective gene; (2) the mRNA by inducing the excision of the mutation-bearing exon during splicing, or by inhibiting the NMD-associated degradation and (iii) the protein by suppressing the premature termination of translation using transfer ribonucleic acid (tRNA) suppressors or drugs inducing readthrough. Indeed, a combination of these approaches may be necessary, and it is most likely that they will lead to a mutation-specific, personalised medicine. Key Concepts Nonsense mutations may lead to loss or gain of function pathological mechanisms. Premature termination codons (PTCs) resulting from nonsense mutations trigger transcript degradation through the nonsense-mediated mRNA decay (NMD) mechanism. Mutant mRNA escaping NMD lead to the synthesis of truncated proteins potentially deleterious. Skipping of nonsense mutation-bearing exons can be induced by antisense oligonucleotides and leads to internally deleted proteins that retain some functionality. tRNA suppressors enable the reintroduction of a ‘sense’ amino acid and the translation of the full-length protein by competing with the termination factor eRF1. Drug-induced readthrough of PTCs may allow synthesis of full-length functional proteins. Synergetic action between NMD inhibitors and readthrough inducers may potentialise reexpression of full-length proteins with restored functionality. Therapeutic approaches will most likely be mutation and disease specific." @default.
- W1484612773 created "2016-06-24" @default.
- W1484612773 creator A5032686287 @default.
- W1484612773 creator A5090435222 @default.
- W1484612773 date "2018-04-27" @default.
- W1484612773 modified "2023-10-16" @default.
- W1484612773 title "Nonsense Mutations Causing Inherited Diseases: Therapeutic Approaches" @default.
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