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The study of the geographic distribution and diversity of genetic variation, known as the “phylogeographic approach” (Avise et al. 1995), is emerging as a useful tool for the investigation of range expansions, migrations, and other forms of gene flow during prehistory. Most of these clusters are clades defined by particular control-region and/or coding-region motifs, although recurrent mutation, especially in the control region, can sometimes erase diagnostic elements of these motifs. More data from the Near East have been published since this initial analysis, suggesting that the Bedouin may be unrepresentative of Near Eastern populations. Here, we extend the Near Eastern database further, to a total of 1,234 individuals sampled from throughout the region, including ~500 from the vicinity of the Fertile Crescent, where agriculture emerged from the increasingly sedentary Natufian populations at the end of the last Ice Age (Henry 1989).
It is particularly suited to the study of nonrecombining-marker systems such as mt DNA, which is inherited down the female line and evolves rapidly, so that, provided that sufficient characters are assayed, the maternal genealogy can be well resolved. We have formalized the procedure for founder analysis, investigated the extent of confounding recurrent gene flow between the putative source and derived populations, and developed criteria that take into account the effects of both gene flow and recurrent mutation.
To estimate the Palaeolithic and Neolithic contributions to European mt DNA diversity more accurately than was previously achievable, we have now extended the Near Eastern, European, and northern-Caucasus databases to 1,234, 2,804, and 208 samples, respectively. 1998a) and with ~20% dating to fresh immigrations during the early Neolithic.
Both back-migration into the source population and recurrent mutation in the source and derived populations represent major obstacles to this approach. However, these estimates depend on a reliable determination of founder sequence types, since the undetected presence of ancestral heterogeneity in a colonizing population would result in an overestimation of the age.