Abstract
We analyzed mtDNA HVRβI variation among six tribal populationsβAndh, Pardan, Gond, Naikpod, Kolam and Chenchuβfrom Andhra Pradesh. These tribes belong to the Dravidian and IndoβEuropean linguistic group. Except for Chenchu, the rest of the tribal samples were collected from two or more than two locations. The analysis of molecular variance (AMOVA) of the sequences yields a significant F~ST~ value (0.045), suggesting a fair degree of genetic differentiation among these tribes. When the tribal samples collected from different locations were considered as subpopulations in AMOVA, it is found that the variation among the subunits within the tribal groups is smaller than among the tribes. However, when Chenchu is removed from the analysis, the magnitude of within and between groups diversity becomes similar. In the multidimensional scaling plot based on F~ST~ distances the Chenchu is found to be the extreme outlier. Exclusion of Chenchu from AMOVA analysis and multidimensional scaling plot does not result in any specific pattern of population clustering. Mismatch distribution suggest that Chenchu might have undergone a bottleneck effect and does not show evidence of past demographic expansion as shown by the other five tribal groups. A comparison of AP tribes with some other caste and tribal populations of India suggests common maternal genetic heritage. Am. J. Hum. Biol., 2008. Β© 2008 WileyβLiss, Inc.