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• W2093597710 abstract "Numerous previous studies have elucidated 2 surprising patterns of spliceosomal intron evolution in diverse eukaryotes over the past roughly 100 Myr. First, rates of recent intron gain in a wide variety of eukaryotic lineages have been surprisingly low, far too low to explain modern intron densities. Second, intron losses have outnumbered intron gains over a variety of lineages. For several reasons, land plants might be expected to have comparatively high rates of intron gain and thus to represent a possible exception to this pattern. However, we report several studies that indicate low rates of intron gain and an excess of intron losses over intron gains in a variety of plant lineages. We estimate that intron losses have outnumbered intron gains in recent evolution in Arabidopsis thaliana (roughly 12.6 times more losses than gains), Oryza sativa (9.8 times), the green alga Chlamydomonas reinhardtii (5.1 times), and the Bigelowiella natans nucleomorph, an enslaved green algal nucleus (2.8 times). We estimate that during recent evolution, A. thaliana and O. sativa have experienced very low rates of intron gain of around one gain per gene per 2.6–8.0 billion years. In addition, we compared 8,258 pairs of putatively orthologous A. thaliana–O. sativa genes. We found that 5.3% of introns in conserved coding regions are species-specific. Observed species-specific A. thaliana and O. sativa introns tend to be exact and to lie adjacent to each other along the gene, in a pattern suggesting mRNA-mediated intron loss. Our results underscore that low intron gain rates and intron number reduction are common features of recent eukaryotic evolution. This pattern implies that rates of intron creation were higher during earlier periods of evolution and further focuses attention on the causes of initial intron proliferation." @default.
• W2093597710 created "2016-06-24" @default.
• W2093597710 creator A5045315721 @default.
• W2093597710 creator A5084815327 @default.
• W2093597710 date "2006-10-16" @default.
• W2093597710 modified "2023-10-12" @default.
• W2093597710 title "Patterns of Intron Loss and Gain in Plants: Intron Loss-Dominated Evolution and Genome-Wide Comparison of O. sativa and A. thaliana" @default.
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• W2093597710 doi "https://doi.org/10.1093/molbev/msl159" @default.
• W2093597710 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17065597" @default.
• W2093597710 hasPublicationYear "2006" @default.
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