1
They are sub-ethnos of Dargins isolated to few villages. So it makes sense that they are so homogeneous.
When it comes to relatively larger groups, one can see that Avars, Dargins and Ingush (I know they are not in Dagestan but still) don't have much haplogroup diversity.
I think in Yusunbayev's work Dargins scored like 90% J1, although in later studies they also scored some Rs.
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