Judeo-Tats of Dagestan

Fig. 1: Sampling locations (stars)
and Tat-speaking areas; (dotted line: Muslim Tat dialect; solid line: Judeo-Tat dialect)

"Judeo-Tats emerged as a group with tight matrilineal genetic legacy who separated early from other Jewish communities. Tats exhibited genetic signals of a much longer in situ evolution, which appear as substantially unlinked with other Indo-Iranian enclaves in the Caucasus.
The independent demographic histories of the two samples [Judeo-Tats and Muslim-Tats], with mutually reversed profiles at paternally and maternally transmitted genetic systems, suggest that geographic proximity and linguistic assimilation of Tati-speakers from Dagestan do not reflect a common ancestry." References Bertoncini,S. et al., 2012, The dual origin of Tati-speakers from Dagestan as written in the genealogy of uniparental variants, American Journal of Human Biology, url: http://onlinelibrary.wiley.com/doi/10.1002/ajhb.22220/pdf.