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- W2154270713 abstract "There has been a controversy on whether alternatively spliced exons (ASEs) evolve faster than constitutively spliced exons (CSEs). Although it has been noted that ASEs are subject to weaker selective constraints than CSEs, so they evolve faster, there have also been studies that indicated slower evolution in ASEs than in CSEs. In this study, we retrieve more than 5,000 human-mouse orthologous exons and calculate the synonymous (KS) and nonsynonymous (KA) substitution rates in these exons. Our results show that ASEs have higher KA values and higher KA/KS ratios than CSEs, indicating faster amino acid–level evolution in ASEs. The faster evolution may be in part due to weaker selective constraints. It is also possible that the faster rate is in part due to faster functional evolution in ASEs. On the other hand, the majority of ASEs have lower KS values than CSEs. With reference to the substitution rate in introns, we show that the KS values in ASEs are close to the neutral substitution rate, whereas the synonymous substitution rate in CSEs has likely been accelerated. The elevated synonymous rate in CSEs is not related to CpG dinucleotides or low-complexity regions of protein but may be weakly related to codon usage bias. The overall trends of higher KA and lower KS in ASEs than in CSEs are also observed in human-rat and mouse-rat comparisons. Therefore, our observations hold for mammals of different molecular clocks." @default.
- W2154270713 created "2016-06-24" @default.
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- W2154270713 date "2005-12-20" @default.
- W2154270713 modified "2023-09-26" @default.
- W2154270713 title "Alternatively and Constitutively Spliced Exons Are Subject to Different Evolutionary Forces" @default.
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- W2154270713 doi "https://doi.org/10.1093/molbev/msj081" @default.
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