Natural Selection and Repeated Patterns of Molecular Evolution
RESEARCH ARTICLE Natural selection and repeated patterns of molecular evolution following allopatric divergence Yibo Dong1,2†, Shichao Chen3,4,5†, Shifeng Cheng6, Wenbin Zhou1, Qing Ma1, Zhiduan Chen7, Cheng-Xin Fu8, Xin Liu6*, Yun-peng Zhao8*, Pamela S Soltis3*, Gane Ka-Shu Wong6,9,10*, Douglas E Soltis3,4*, Qiu-Yun(Jenny) Xiang1* 1Department of Plant and Microbial Biology, North Carolina State University, Raleigh, United States; 2Plant Biology Division, Noble Research Institute, Ardmore, United States; 3Florida Museum of Natural History, University of Florida, Gainesville, United States; 4Department of Biology, University of Florida, Gainesville, United States; 5School of Life Sciences and Technology, Tongji University, Shanghai, China; 6Beijing Genomics Institute, Shenzhen, China; 7State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China; 8Laboratory of Systematic & Evolutionary Botany and Biodiversity, College of Life Sciences, Zhejiang University, Hangzhou, China; 9Department of Biological Sciences, University of Alberta, Edmonton, Canada; 10Department of Medicine, University of Alberta, Edmonton, Canada *For correspondence: liuxin@genomics.cn (XL); Abstract Although geographic isolation is a leading driver of speciation, the tempo and pattern ypzhao913@gmail.com (Y-Z); of divergence at the genomic level remain unclear. We examine genome-wide divergence of psoltis@flmnh.ufl.edu (PSS); putatively single-copy orthologous genes (POGs) in 20 allopatric species/variety pairs from diverse gane@ualberta.ca (GK-SW); angiosperm clades, with 16 pairs reflecting the classic eastern Asia-eastern North America floristic dsoltis@ufl.edu (DES); disjunction. In each pair, >90% of POGs are under purifying selection, and <10% are under positive jenny_xiang@ncsu.edu (Q-Y(J)X) selection.
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