Repeated divergent selection on pigmentation genes in a rapid finch radiation.
Sci Adv
; 3(5): e1602404, 2017 May.
Article
em En
| MEDLINE
| ID: mdl-28560331
ABSTRACT
Instances of recent and rapid speciation are suitable for associating phenotypes with their causal genotypes, especially if gene flow homogenizes areas of the genome that are not under divergent selection. We study a rapid radiation of nine sympatric bird species known as capuchino seedeaters, which are differentiated in sexually selected characters of male plumage and song. We sequenced the genomes of a phenotypically diverse set of species to search for differentiated genomic regions. Capuchinos show differences in a small proportion of their genomes, yet selection has acted independently on the same targets in different members of this radiation. Many divergent regions contain genes involved in the melanogenesis pathway, with the strongest signal originating from putative regulatory regions. Selection has acted on these same genomic regions in different lineages, likely shaping the evolution of cis-regulatory elements, which control how more conserved genes are expressed and thereby generate diversity in classically sexually selected traits.
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MEDLINE
Assunto principal:
Seleção Genética
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Pigmentação
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Genoma
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Característica Quantitativa Herdável
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Tentilhões
Limite:
Animals
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article