한빛사 논문
Jae Young Choia,1, Xiaoguang Daib, Ornob Alama, Julie Z. Pengc, Priyesh Rughanib, Scott Hickeyd, Eoghan Harringtonb, Sissel Juulb, Julien F. Ayrolesc, Michael D. Purugganana, and Elizabeth A. Stacye,f,1
aCenter for Genomics and Systems Biology, Department of Biology, New York University, New York, NY 10003; bOxford Nanopore Technologies Inc., New York, NY 10013; cDepartment of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544; dOxford Nanopore Technologies Inc., San Francisco, CA 94501; eSchool of Life Sciences, University of Nevada, Las Vegas, Las Vegas, NV 89119; and fCollege of Agriculture, Forestry, and Natural
Resource Management, University of Hawaii Hilo, Hilo, HI 96720
1To whom correspondence may be addressed.
Abstract
Some of the most spectacular adaptive radiations begin with founder populations on remote islands. How genetically limited founder populations give rise to the striking phenotypic and ecological diversity characteristic of adaptive radiations is a paradox of evolutionary biology. We conducted an evolutionary genomics analysis of genus Metrosideros, a landscape-dominant, incipient adaptive radiation of woody plants that spans a striking range of phenotypes and environments across the Hawaiian Islands. Using nanopore-sequencing, we created a chromosome-level genome assembly for Metrosideros polymorpha var. incana and analyzed whole-genome sequences of 131 individuals from 11 taxa sampled across the islands. Demographic modeling and population genomics analyses suggested that Hawaiian Metrosideros originated from a single colonization event and subsequently spread across the archipelago following the formation of new islands. The evolutionary history of Hawaiian Metrosideros shows evidence of extensive reticulation associated with significant sharing of ancestral variation between taxa and secondarily with admixture. Taking advantage of the highly contiguous genome assembly, we investigated the genomic architecture underlying the adaptive radiation and discovered that divergent selection drove the formation of differentiation outliers in paired taxa representing early stages of speciation/divergence. Analysis of the evolutionary origins of the outlier single nucleotide polymorphisms (SNPs) showed enrichment for ancestral variations under divergent selection. Our findings suggest that Hawaiian Metrosideros possesses an unexpectedly rich pool of ancestral genetic variation, and the reassortment of these variations has fueled the island adaptive radiation.
Metrosideros, adaptive radiation, ecological speciation, incipient speciation, speciation genomics
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