Gene conversion drives the evolution of HINTW, an ampliconic gene on the female-specific avian W chromosome.

@article{Backstrm2005GeneCD,
  title={Gene conversion drives the evolution of HINTW, an ampliconic gene on the female-specific avian W chromosome.},
  author={Niclas Backstr{\"o}m and Helene Ceplitis and Sofia Berlin and Hans Ellegren},
  journal={Molecular biology and evolution},
  year={2005},
  volume={22 10},
  pages={1992-9}
}
The HINTW gene on the female-specific W chromosome of chicken and other birds is amplified and present in numerous copies. Moreover, as HINTW is distinctly different from its homolog on the Z chromosome (HINTZ), is a candidate gene in avian sex determination, and evolves rapidly under positive selection, it shows several common features to ampliconic and testis-specific genes on the mammalian Y chromosome. A phylogenetic analysis within galliform birds (chicken, turkey, quail, and pheasant… CONTINUE READING

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