View Full Version : West Eurasian Y-DNA G interpreted

04-16-2013, 11:04 PM
Distinguishing the co-ancestries of haplogroup G Y-chromosomes in the populations of Europe and the Caucasus.
Rootsi S, Myres NM, Lin AA, Järve M, King RJ, Kutuev I, Cabrera VM. Eur J Hum Genet. 2012 Dec;20(12):1275-82. doi: 10.1038/ejhg.2012.86. Epub 2012 May 16.

Haplogroup G, together with J2 clades, has been associated with the spread of agriculture, especially in the European context. However, interpretations based on simple haplogroup frequency clines do not recognize underlying patterns of genetic diversification. Although progress has been recently made in resolving the haplogroup G phylogeny, a comprehensive survey of the geographic distribution patterns of the significant sub-clades of this haplogroup has not been conducted yet. Here we present the haplogroup frequency distribution and STR variation of 16 informative G sub-clades by evaluating 1472 haplogroup G chromosomes belonging to 98 populations ranging from Europe to Pakistan. Although no basal G-M201* chromosomes were detected in our data set, the homeland of this haplogroup has been estimated to be somewhere nearby eastern Anatolia, Armenia or western Iran, the only areas characterized by the co-presence of deep basal branches as well as the occurrence of high sub-haplogroup diversity. The P303 SNP defines the most frequent and widespread G sub-haplogroup. However, its sub-clades have more localized distribution with the U1-defined branch largely restricted to Near/Middle Eastern and the Caucasus, whereas L497 lineages essentially occur in Europe where they likely originated. In contrast, the only U1 representative in Europe is the G-M527 lineage whose distribution pattern is consistent with regions of Greek colonization. No clinal patterns were detected suggesting that the distributions are rather indicative of isolation by distance and demographic complexities.

The abstract does not provide any data on MRCA for those SNP-defining subclades. This would be most useful in elucidating how exactly the current picture of Y-DNA G in Europe and Asia took place.

It isn't unreasonable to suppose P303 is a "basal Neolithic" marker whose offshoots in Europe and Asia (L497 and U1 respectively) represent localisations.

J Man
04-16-2013, 11:30 PM
^Looks like an interesting and important study. The absence of J2 in the tested Neolithic remains from Europe to date is also interesting. Some seem to think that J2 expanded a bit later in the Near East/Caucasus from highland regions.

04-18-2013, 12:30 AM
My uncle is

P303+ L140+ L497- U1- Z724-

Does that mean that G-L140 began its expansion from southern Poland? :)