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The evolution of Sex-linked barring alleles in chickens involves both regulatory and coding changes in CDKN2A

Fig 1

Alleles and phenotypes at the Sex-linked barring (CDKN2A) locus in chicken.

(A) Female and male Coucou de Rennes chicken with separately depicted feather illustrating the iconic Sex-linked barring phenotype caused by the B1 allele. (B) Sex-linked barring alleles and associated sequence variants. SNP1 and SNP2 are non-coding while SNP3 and SNP4 constitute non-synonymous changes in the region encoding the MDM2 binding domain. (C) Sex-linked dilution phenotype caused by the B2 allele. Note how the homozygous male has an almost white appearance whereas the hemizygous female as well as the heterozygous male show a Sex-linked barring pattern. (D) Phenotype with individual feathers from N/N, B2/N and B0/N chicken. Photo credits: (A) Hervé Ronné, Ecomusée du pays de Rennes, (C) Susanne Kerje, (D) Dominic Wright and Doreen Schwochow-Thalmann.

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doi: https://doi.org/10.1371/journal.pgen.1006665.g001