Interspecific introgression mediates adaptation to whole genome duplication

Interspecific introgression mediates adaptation to whole genome duplication
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种间渗入介导对全基因组复制的适应

DOI:
10.1101/636019
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发表时间:
2019
期刊:
--
影响因子:
--
通讯作者:
Marburger S
Marburger S
中科院分区:
--
文献类型:
--
作者:
Marburger S

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Adaptive gene flow is a consequential phenomenon across all kingdoms. Although recognition is increasing, there is no study showing that bidirectional gene flow mediates adaptation at loci that manage core processes. We previously discovered concerted molecular changes among interacting members of the meiotic machinery controlling crossover number upon adaptation to whole-genome duplication (WGD) inArabidopsis arenosa. Here we conduct a population genomic study to test the hypothesis that adaptation to WGD has been mediated by adaptive gene flow betweenA. arenosaandA. lyrata. We find thatA. lyrataunderwent WGD more recently thanA. arenosa, suggesting that pre-adapted alleles have rescued nascentA. lyrata, but we also detect gene flow in the opposite direction at functionally interacting loci under the most extreme levels of selection. These data indicate that bidirectional gene flow allowed for survival after WGD, and that the merger of these species is greater than the sum of their parts.
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