Love your Chihuahua or Yorkie? Thank a tiny genetic change that has been hiding out in the ancestor of dogs for millions of years. NationalPetMonth
. That may not sound like much, Ostrander says, but that’s a lot of work for a single gene to do. “In humans, the difference between being 5’6” and 6’6” is hundreds of genes.” It was unclear, however, exactly which genetic changes causedIn the new work, Ostrander’s postdoc, Jocelyn Plassais, now at the University of Rennes, widened the genetic net. He scanned nearly 1300 genomes from 230 modern breeds, indigenous and village dogs, and one dingo .
To trace the evolutionary history of the alleles, Plassais and his colleagues scanned 33 ancient dog genomes dating back approximately 11,000 years. Even the oldest dogs had varying proportions of C and T alleles—which, as in modern dogs, matched their probable body sizes. The find reveals Victorian breeders did not introduce these genetic variants.
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