生物
转座因子
基因组
基因组大小
进化生物学
基因组进化
系统发育树
GC含量
换位(逻辑)
系统发育学
遗传学
遗传算法
基因
语言学
哲学
作者
Henrique R.M Antoniolli,Maríndia Deprá,Vitor Valente
出处
期刊:Genome
[Canadian Science Publishing]
日期:2023-07-01
卷期号:66 (7): 193-201
标识
DOI:10.1139/gen-2022-0073
摘要
Genome size evolution is known to be related with transposable elements, yet such relation in incipient species remains poorly understood. For decades, the willistoni subgroup of Drosophila has been a model for evolutionary studies because of the different evolutionary stages and degrees of reproductive isolation its species present. Our main question here was how speciation influences genome size evolution and the fraction of repetitive elements, with a focus on transposable elements. We quantitatively compared the mobilome of four species and two subspecies belonging to this subgroup with their genome size, and performed comparative phylogenetic analyses. Our results showed that genome size and the fraction of repetitive elements evolved according to the evolutionary history of these species, but the content of transposable elements showed some discrepancies. Signals of recent transposition events were detected for different superfamilies. Their low genomic GC content suggests that in these species transposable element mobilization might be facilitated by relaxed natural selection. Additionally, a possible role of the superfamily DNA/ TcMar-Tigger in the expansion of these genomes was also detected. We hypothesize that the undergoing process of speciation could be promoting the observed increase in the fraction of repetitive elements and, consequently, genome size.
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