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- W2065548844 abstract "Intron density in eukaryote genomes varies by more than three orders of magnitude, so there must have been extensive intron gain and/or intron loss during evolution. A favored and partial explanation for this range of intron densities has been that introns have accumulated stochastically in large eukaryote genomes during their evolution from an intron-poor ancestor. However, recent studies have shown that some eukaryotes lost many introns, whereas others accumulated and/or gained many introns. In this article, we discuss the growing evidence that these differences are subject to selection acting on introns depending on the biology of the organism and the gene involved. Intron density in eukaryote genomes varies by more than three orders of magnitude, so there must have been extensive intron gain and/or intron loss during evolution. A favored and partial explanation for this range of intron densities has been that introns have accumulated stochastically in large eukaryote genomes during their evolution from an intron-poor ancestor. However, recent studies have shown that some eukaryotes lost many introns, whereas others accumulated and/or gained many introns. In this article, we discuss the growing evidence that these differences are subject to selection acting on introns depending on the biology of the organism and the gene involved. a eukaryote endosymbiont alga whose cellular structure is reduced to the point that only a membrane-bound nucleus and a chloroplast remain. Nucleomorph genomes are compact compared with those of free living eukaryotes. an excess of introns in the 5′ regions of genes. Many unicellular eukaryotes have 5′ intron biases, multicellular genomes have no bias of intron positions. the average number of introns per gene over an entire genome (or set of genes). natural selection on the basis of maximum reproductive and/or growth rate (e.g. Escherichia coli or baker's yeast). natural selection that favors organisms with slow growth and long life cycles that live in stable environments. the process of transcription, splicing, reverse transcription by endogenous reverse transcriptases and recombination of the intron-less cDNAs with the genome. It is known to occur in many eukaryote genomes. a class of conserved elements identified in metazoan genomes that share 100% identity across at least 200 bp [28]." @default.
- W2065548844 created "2016-06-24" @default.
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- W2065548844 date "2006-01-01" @default.
- W2065548844 modified "2023-10-18" @default.
- W2065548844 title "The biology of intron gain and loss" @default.
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- W2065548844 doi "https://doi.org/10.1016/j.tig.2005.10.006" @default.
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