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Genetic and demographic implications of the Bantu expansion: insights from human pate
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[QUOTE]Originally posted by Djehuti: [QB] Anyway, getting back to the acutal topic... [QUOTE]Originally posted by Evergreen: [qb] Molecular Biology and Evolution, doi:10.1093/molbev/msp069 Genetic and demographic implications of the Bantu expansion: insights from human paternal lineages Gemma Berniell-Lee et al. Abstract The expansion of Bantu languages, which started around 5,000 years before present (YBP) in west/central Africa and spread all throughout sub-Saharan Africa, may represent one of the major and most rapid demographic movements in the history of the human species. Although the genetic footprints of this expansion have been unmasked through the analyses of the maternally-inherited mitochondrial (mtDNA) lineages, information on the genetic impact of this massive movement and on the genetic composition of pre-Bantu populations is still scarce. Here we analyze an extensive collection of Y-chromosome markers - 41 SNPs and 18 STRs - in 883 individuals from 22 Bantu-speaking agriculturalist populations and 3 Pygmy hunter-gatherer populations from Gabon and Cameroon. Our data reveal a recent origin for most paternal lineages in west Central African populations most likely resulting from the expansion of Bantu-speaking farmers that erased the more ancient Y-chromosome diversity found in this area. However, some traces of ancient paternal lineages are observed in these populations, mainly among hunter-gatherers. These results are at odds with those obtained from mtDNA analyses, where high frequencies of ancient maternal lineages are observed, and substantial maternal gene flow from hunter-gatherers to Bantu farmers has been suggested. These differences are most likely explained by socio-cultural factors such as patrilocality. We also find the intriguing presence of paternal lineages belonging to Eurasian haplogroup R1b1*, which might represent footprints of demographic expansions in central Africa not directly related to the Bantu expansion. [/qb][/QUOTE]This is not really new news is it? I mean weren't there studies presented before which show pre-Bantu lineages such as paternal A, B, and even DE?? [QUOTE]Originally posted by The Explorer: [qb] These chromosomes presumably "belonging to" R1b1* may actually be clusters of those dubbed "R1*-M173", which lacked downstream mutations that are assigned to either R1b or R1a; the way the authors framed their statement may give a misleading impression of these having been tested positive for M343 rather than just M173 (R1*), unless of course, it is specifically demonstrated so in the study at hand. The R1*-M173 were determined to lack M343 in studies that had actually also tested for M343 UEP. So...*unless* these are newly uncovered derivatives which are more downstream than the aforementioned M173 chromosomes but yet more upstream than "Eurasian" clusters of R1b1, which would make these chromosomes a new addition to the index of [i]unique[/i] R1* chromosomes in Africa, then I suspect what is being alluded to here, are actually R1*-M173 clusters rather than R1b1*. Anyway, a more complete examination of the study will make it clearer what is going on here. [/qb][/QUOTE]Yes, I was about to say the same thing. How did they mistake R1b1 for R1*?? [/QB][/QUOTE]
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