Reconstruction of ancestral footfalls in South Asia using genomic data

Due to its unique geographical position, juxtaposed in the middle of south-central Asia, east Asia and Southeast Asia, the South Asian Region (SAS) has repeatedly come into contact with people from adjacent regions throughout history and prehistory. The antiquity of the populations and the intricate history of admixture have shaped SAS as one of the most genetically diverse regions in the world. In this article we review our current understanding of the peopling and populations structure of SAS. We do not attempt to be exhaustive but summarize the salient conclusions that have been reached using genetic data and evaluate their robustness. We also identify the unanswered questions and suggest possible approaches that may lead to their answers.