A Polymorphic Human Y-Chromosomal G To A Transition Found In India.

We describe a new G to A transition polymorphism, designated Apt, on the human Y chromosome. The A allele chromosomes and the most closely related G allele chromosomes have been found only in India, where they make up about 1.3% of the population. They are found in several different social groups and show considerable microsatellite, minisatellite and major satellite diversity, suggesting that they do not have a recent origin.