Repeat-sequence turnover shifts fundamentally in species with large genomes

编号 040026601

推送时间 20201123

研究领域 森林培育 

年份 2020 

类型 期刊 

语种 英语

标题 Repeat-sequence turnover shifts fundamentally in species with large genomes

来源期刊 Nature Plant

期 第266期

发表时间 20201019

关键词 evolution;  genetics;  plant sciences;  large genomes;  species lineages; 

摘要 Given the 2,400-fold range of genome sizes (0.06–148.9?Gbp (gigabase pair)) of seed plants (angiosperms and gymnosperms) with a broadly similar gene content (amounting to approximately 0.03?Gbp), the repeat-sequence content of the genome might be expected to increase with genome size, resulting in the largest genomes consisting almost entirely of repetitive sequences. Here we test this prediction, using the same bioinformatic approach for 101 species to ensure consistency in what constitutes a repeat. We reveal a fundamental change in repeat turnover in genomes above around 10?Gbp, such that species with the largest genomes are only about 55% repetitive. Given that genome size influences many plant traits, habits and life strategies, this fundamental shift in repeat dynamics is likely to affect the evolutionary trajectory of species lineages.

服务人员 孙小满

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