The researchers sequenced the genomes of several chicken breeds, including the Ancona, Barred Plymouth Rock, and Rhode Island Red, all of which have distinctive barred or striped feather patterns. They identified a number of genetic variants that were associated with these patterns, including a variant in the gene EDN3, which is known to play a role in the development of pigment cells.
Further experiments showed that the EDN3 variant led to a reduction in the number of pigment cells in the feathers, resulting in the formation of stripes. The researchers also found that the EDN3 variant was associated with a higher expression of the gene MITF, which is known to regulate the production of melanin, the pigment that gives feathers their color.
These findings provide a new understanding of the genetic basis of color patterns in birds and could have implications for understanding human pigmentation disorders. For example, the researchers suggest that the EDN3 variant could be involved in the development of vitiligo, a condition characterized by the loss of pigment cells in the skin.
"Our study provides new insights into the genetic mechanisms underlying color patterns in birds," said lead researcher Dr. Miguel Carneiro. "These findings could have implications for understanding human pigmentation disorders and could also be used to develop new ways to improve the quality and appearance of poultry products."
