生物
群体基因组学
倍性
基因组学
人口
进化生物学
拟南芥
基因流
遗传学
渗入
基因组
自然选择
染色体
基因复制
基因组进化
基因
遗传变异
突变体
社会学
人口学
作者
Patrick J. Monnahan,Filip Kolář,Pierre Baduel,Christian Sailer,Jordan Koch,Róbert Horváth,Benjamin Laenen,Roswitha Schmickl,Pirita Paajanen,Gabriela Šrámková,Magdalena Bohutínská,Brian J. Arnold,Caroline M. Weisman,Karol Marhold,Tanja Slotte,Kirsten Bomblies,Levi Yant
标识
DOI:10.1038/s41559-019-0807-4
摘要
Ploidy-variable species allow direct inference of the effects of chromosome copy number on fundamental evolutionary processes. While an abundance of theoretical work suggests polyploidy should leave distinct population genomic signatures, empirical data remains sparse. We sequenced ~300 individuals from 39 populations of Arabidopsis arenosa, a naturally diploid-autotetraploid species. We find that the impacts of polyploidy on population genomic processes are subtle yet pervasive, such as reduced efficiency of purifying selection, differences in linked selection and rampant gene flow from diploids. Initial masking of deleterious mutations, faster rates of nucleotide substitution and interploidy introgression likely conspire to shape the evolutionary potential of polyploids. This study shows how polyploidy impacts population genomics and the evolutionary potential of polyploids in natural populations of the diploid-autotetraploid Arabidopsis arenosa.
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