https://www.nature.com/articles/s41598-021-84915-1#ref-CR19
Turns out it's not only R1b the only haplogroup that has suffered a total bottleneck in precivilizational times.
All I2 and J2a in Basques can be traced back to a single man in the Neolithic and Chalcolithic(historic times in the...
Browsing through the Jewish Y-DNA Project, I came across a descendant of Movsha Sandler (born c. 1798 in Pusalotas, Lithuania). This matches exactly Adam Sandler's g-g-great-grand-father according to his genealogy. The STR haplotype appear to fit within the M67 clade, and probably the L210 subclade.
In 2013 I explained in my Genetic history of the Italians that the ancient Italic tribes, including the Latins/Romans would have belonged primarily to R1b-U152 (especially Z56). I mentioned that the original Latins of the Roman Republic would also have carried G2a-L140 (specifically the L13...
Here is the breakdown of J2 subclades by province based on the recent study by Boattini et al..
North Italy
In Cuneo, south-west Piedmont, 2 out of 30 samples are J2 (6.5%), both J2a*.
In Savona/Genova, central Liguria, 7 out of 50 samples are J2 (14%), among which three J2a*, two J2a2-M67...
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