Growth factor gene IGF1 is associated with bill size in the black-bellied seedcracker Pyrenestes ostrinus.

ABSTRACT: Pyrenestes finches are unique among birds in showing a non-sex-determined polymorphism in bill size and are considered a textbook example of disruptive selection. Morphs breed randomly with respect to bill size, and differ in diet and feeding performance relative to seed hardness. Previous breeding experiments are consistent with the polymorphism being controlled by a single genetic factor. Here, we use genome-wide pooled sequencing to explore the underlying genetic basis of bill morphology and identify a single candidate region. Targeted resequencing reveals extensive linkage disequilibrium across a 300 Kb region containing the insulin-like growth factor 1 (IGF1) gene, with a single 5-million-year-old haplotype associating with phenotypic dominance of the large-billed morph. We find no ge

SUBMITTER: vonHoldt BM 

PROVIDER: S-EPMC6242981 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature