Origin of J2b2-L283

[Bart0s]

''When we use DATES (19) to date the admixture of steppe ancestry in populations of Southeastern Europe (Fig. 5F and fig. S6), we arrive
at an estimate that this took place ~4850 years ago, i.e., precisely after the Yamnaya expansion, and within the time frame of our “highsteppe” cluster individuals. This suggests that (as a first approximation) steppe ancestry in Southeastern Europe from the Bronze Age onward was largely mediated by descendants of Yamnaya and local Balkan populations and not by earlier waves out of the steppe that affected the region sporadically. This admixture need not have taken place in one locality, as indicated by the presence of Yamnaya-like individuals in several regions of the Balkans, spatially beyond both the cultural transition
zone between steppe pastoralist and settled populations (32), and the geographical one from the Eastern European flatlands into mountainous areas.''

https://reich.hms.harvard.edu/sites/...ronzeAge_2.pdf

[Bart0s]

from the Genomi History of SE:

''Farming was first introduced to Europe in the mid-7th millennium BCE–associated with migrants from Anatolia who settled in the Southeast before spreading throughout Europe. To understand the dynamics of this process, we analyzed genome-wide ancient DNA data from 225 individuals who lived in southeastern Europe and surrounding regions between 12,000 and 500 BCE. We document a West-East cline of ancestry in indigenous hunter-gatherers and–in far-eastern Europe–early stages in the formation of Bronze Age Steppe ancestry. We show that the first farmers of northern and western Europe passed through southeastern Europe with limited hunter-gatherer admixture, but that some groups that remained mixed extensively, without the male-biased hunter-gatherer admixture that prevailed later in the North and West. Southeastern Europe continued to be a nexus between East and West, with intermittent genetic contact with the Steppe up to 2000 years before the migrations that replaced much of northern Europe’s population.''

[tipirneni]

100 mill in an area of a billion still makes it a minority doesn't it ? Depends also how many studies have been conducted.

J-L283 in Europe is not very common https://www.yfull.com/tree/j-l283/ , In the Balkans most of it found seems https://www.yfull.com/tree/J-Z597/ but there are some others that have been found. Albanians fall under many but is dominated by https://www.yfull.com/tree/J-Z638/ which is a branch of Z597. Lazaridis and Reich put the proto-IE homeland in West Asia / Caucasus and this Y-DNA most likely did not exist in Europe prior to the Bronze Age just like Indo European markers like R1b-Z2103 and others didn't but are related to Bronze Age expansion which we can also trace.

Here is a map of all Ancient J-L283 found: https://www.google.com/maps/d/viewer...7461230349&z=6


We have dozzens of samples all across West Europe and Central Europe from different periods, this Y-DNA keeps showing up in the Balkans during the Bronze Age and it's presence in other parts of Europe seems to be an expansion from there and it appears with R1b-Z2103 around the Balkans and close to the Steppes.


No serious geneticist considers IE languages in the Balkans to of come from Corded Ware or Bell Beakers , neither culturally nor genetically and this Y-DNA is absent among these cultures. It appears when Indo Europeans started expanding directly from the Steppes with certain cultures. In Bronze Age Maros Culture in Northern Serbia it appears together with R1b-Z2103.


This Y-DNA seems to be related to R1b-Z2103 Yamnaya or was picked up by such people at one point and in the Adriatic coast it hit a founder effect from few Illyrian tribes.


J-L283 according to Y-FULL has a TMRCA of 5600 YBP or so.

The J2a Iran Neolithic sites are found all over South Asia but the J2b not found anywhere. However J2b people are 2 times that of J2a found today in South Asia. One study found there is a coincidence between j2b clades and the presence of Mesolithic mounds.

HG J2b2-M241–related microsatellite variance is higher in Uttar Pradesh near the border of Nepal. It should be noted that numerous Mesolithic sites have been observed in this region (Sengupta et al. – 2006)

Many are saying it is a demic diffusion from Iranian towns but the timeframes are still not right due to no aDNA found so far. Compared to this void in J2b, J2a samples have been found in many places in Neolithic and Chalcolithic towns in Indus Valley Periphery. The overall spread of J2b2 is also very similar to H1a haplogroup in India and BD.