Researchers Identified Genetic Source of Mottled Feathers

A study uncovered three mutations in the EDNRB2 gene that dictate feather patterns in various chicken breeds.

Updated on Oct. 13, 2026 in Bird Watching

Gouache-painted illustration of a single mottled chicken feather against a plain textured background, illustrating biological genetic research. — Researchers have identified three specific genetic mutations in the EDNRB2 gene that dictate mottled feather patterns in various chicken breeds. AI Illustration. Upload story photo >

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Does selective breeding help us better understand the complexity of genetic evolution in nature?

Scientists discovered that three independent mutations in the EDNRB2 gene cause the distinctive mottled pattern found in chicken feathers. This genetic shift affects how pigment-producing cells develop and move throughout the bird.

Why it matters

Understanding these genetic drivers explains how human selective breeding has successfully maintained specific color patterns without negatively impacting overall poultry production.

Researchers identified three separate mutations in the EDNRB2 gene, which is located on chromosome 4. These mutations result in a mild reduction in signaling that manifests as mottled feathering.

The players

Texas A&M College of Veterinary Medicine and Biomedical Sciences

This institution served as the primary research center for the genetic mapping of the chicken mottling trait.

The details

By crossing Mottled Houdan chickens with Black Langshan birds, researchers mapped the trait to chromosome 4 using whole-genome sequencing. The study confirmed that Mottled Houdan chickens possess a different genetic mutation than those found in Japanese chicken breeds.

The research findings were published in the journal Animal Genetics on October 13, 2026.

Culture Shift

The study reflects a long-term movement in agricultural science to decode the genetic history behind traits favored during domestic breeding. This research follows the patterns established by the EDNRB2 gene research at the Texas A&M College of Veterinary Medicine.

For hobbyists and poultry keepers in Texas, these findings clarify why certain chicken breeds maintain consistent color patterns over generations. This knowledge helps enthusiasts better understand the genetic traits present in their own flocks.

The takeaway

Genetic mapping demonstrates how subtle changes in cell signaling can lead to distinct physical appearances in domestic animals. Breeders can use this insight to ensure the long-term health and aesthetic diversity of their bird populations.