以全基因組重定序研究基因漸滲對台灣特有小彎嘴畫眉(Pomatorhinus musicus)適應性分化的重要性

Recent genetic data suggested that genetic introgression is common among different evolutionary lineages. It raised an issue whether it could serve as an important genetic source for adaptive evolution. This project used Taiwan's Pomatorhinus musicus and its sister group P. ruficollis, which are known to have gene flow during their species process as a system to evaluate the importance of genetic introgression in adaptive evolution. We firstly de novo sequenced and assemble a draft genome for a P. muscicus individual. We used Hi-C technology to assemble this genome to chromosome level. Then we used population genomic approach to detect the candidate introgressed genomic regions in P. musicus population. Our results of PCA and Baysesian clustering analysis suggested that Taiwan endemic P. musicus is indeed an independent evolutionary lineage; however, results of Treemix analysis supported that there had gene flow from P. fuficollis into P. mussicus. We used ABBA analysis to identify potential genomic introgressed regions in P. mussicus genomes. Among them, 14 may be relate gene to cell division, mitosis, metal bonding, inflammatory response, but it is still not clear that it is related to adaptation. We are still conducting analysis to identify which genomic regions of P. mussicus had under positive selection to evaluate the importance of introgression for adaptive evolution.