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Quack leptin.

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Summary
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Researchers identified the leptin (LEP) gene in wild birds, crucial for energy balance, but found it missing in domestic poultry. This suggests LEP gene loss may facilitate bird domestication.

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Comparative Anatomy

Background:

  • A leptin (LEP) transcript was found up-regulated in ducks infected with avian influenza A virus.
  • The LEP gene symbol is reserved for leptin, a key regulator of energy balance in mammals.

Purpose of the Study:

  • To identify and characterize the leptin (LEP) gene in avian species.
  • To investigate the presence and evolutionary conservation of the LEP gene in wild birds versus domestic fowl.

Main Methods:

  • Extensive genome database searches across avian species.
  • Comparative sequence analysis and synteny analysis to confirm orthology.

Main Results:

  • The first identification of coding sequences for the full leptin protein precursor in wild birds (falcons, tits, finches, doves).
  • Confirmed avian leptin as a true ortholog of mammalian leptin through gene structure, synteny, and sequence similarity (up to 54% identity).
  • The LEP gene was not identifiable in ducks and other domestic fowls.

Conclusions:

  • The absence of the LEP gene in poultry suggests a potential role in suitability for domestication.
  • The presence of an intact avian leptin gene in wild birds may explain the evolutionary conservation of its receptor in leptin-less fowls.