TLDR Birds can lose neck feathers due to a genetic change that increases a gene's activity, helping them adapt to heat.
The study explored the developmental mechanisms behind the loss of neck feathering in birds, focusing on the Naked neck mutation in chickens. Researchers identified a large genetic insertion linked to this trait, which led to increased expression of the BMP12/GDF7 gene in embryonic skin. This gene, part of the BMP family, inhibits feather formation through a reaction-diffusion mechanism. The study found that neck skin selectively produces retinoic acid, enhancing BMP signaling and making it more sensitive to feather suppression compared to body skin. This cryptic patterning allows for the evolutionary adaptation of a bare neck while maintaining feathering on the body, contributing to heat tolerance in birds.
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