The Genetics of Seasonal Migration and Plumage Color.
Curr Biol
; 26(16): 2167-73, 2016 08 22.
Article
em En
| MEDLINE
| ID: mdl-27476599
ABSTRACT
Details on the genetics of behavioral and quantitative phenotypes remain limited to a few organisms. Such information is central to understanding both adaptation and speciation, as many of these phenotypes reduce gene flow between taxa [1-3]. Hybrid zones provide an ideal arena for studying this topic, as they consist of recombinant genotypes that allow genetic mapping of traits distinguishing natural populations [4]. We examined the genetic basis of migratory orientation and plumage color, both of which may contribute to speciation, in a hybrid zone between two groups of Swainson's thrushes that differ in these traits. We identified a cluster of SNPs on chromosome 4 strongly associated with migratory orientation. Genes involved with the circadian clock, nervous system, and cell signaling were located here and included candidates implicated in smaller-scale studies of migration in different animal groups, supporting previous suggestions that there is a common gene package for migration [5]. Plumage color was more polygenic than migratory orientation but showed strong associations on the Z chromosome that included SNPs linked to TYRP1, a gene involved in the production of eumelanin. We integrated these results with genomic data from pure populations and found that regions associated with both phenotypes co-localized with regions of elevated relative differentiation between the groups. This finding relates to the literature on islands of differentiation [6-8] by implicating divergent selection in generating these peaks. Together, our results identify specific genomic regions involved in both the regulation of complex phenotypes across animal groups and speciation [9].
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Variação Genética
/
Pigmentação
/
Aves Canoras
/
Migração Animal
Tipo de estudo:
Prognostic_studies
Limite:
Animals
País/Região como assunto:
America do norte
Idioma:
En
Revista:
Curr Biol
Ano de publicação:
2016
Tipo de documento:
Article