The genomic landscape underlying phenotypic integrity in the face of gene flow in crows - PubMed (original) (raw)

. 2014 Jun 20;344(6190):1410-4.

doi: 10.1126/science.1253226.

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The genomic landscape underlying phenotypic integrity in the face of gene flow in crows

J W Poelstra et al. Science. 2014.

Abstract

The importance, extent, and mode of interspecific gene flow for the evolution of species has long been debated. Characterization of genomic differentiation in a classic example of hybridization between all-black carrion crows and gray-coated hooded crows identified genome-wide introgression extending far beyond the morphological hybrid zone. Gene expression divergence was concentrated in pigmentation genes expressed in gray versus black feather follicles. Only a small number of narrow genomic islands exhibited resistance to gene flow. One prominent genomic region (<2 megabases) harbored 81 of all 82 fixed differences (of 8.4 million single-nucleotide polymorphisms in total) linking genes involved in pigmentation and in visual perception-a genomic signal reflecting color-mediated prezygotic isolation. Thus, localized genomic selection can cause marked heterogeneity in introgression landscapes while maintaining phenotypic divergence.

Copyright © 2014, American Association for the Advancement of Science.

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