New important paper refining the understanding of old branches of mostly African patrilineages (which are important to understand the ancestry of all Humankind).
Rossaria Scozzari et al., Molecular Dissection of the Basal Clades in the Human Y Chromosome Phylogenetic Tree. PLoS ONE 2012. Open access ··> LINK [doi:10.1371/journal.pone.0049170]
One hundred and forty-six previously detected mutations were more precisely positioned in the human Y chromosome phylogeny by the analysis of 51 representative Y chromosome haplogroups and the use of 59 mutations from literature. Twenty-two new mutations were also described and incorporated in the revised phylogeny. This analysis made it possible to identify new haplogroups and to resolve a deep trifurcation within haplogroup B2. Our data provide a highly resolved branching in the African-specific portion of the Y tree and support the hypothesis of an origin in the north-western quadrant of the African continent for the human MSY diversity.
|Figure 1. Revised topology of the deepest portion of the human MSY tree.
Besides B2, A3 has also been greatly improved in its understanding suggesting recent expansions.
Haplogroup B2 is typical from Pygmies but also found through all the Sahel from Ethiopia to Mali, among other Central African populations and even among Southern African aborigines, the Khoisan peoples.
Haplogroup A3 is important in Sudan and the Horn of Africa, as well as among the Khoisan peoples of Southern Africa. It’s also occasionally found among Bantu speakers of Southern Africa, Egyptians, West Asian peoples and has also been reported in Sardinia.
New C subclade
Besides Africa a new haplogroup C7 was reported in an Italian individual. See supp. materials.