I am BY162321 and surely Y303177, from NorthWestern corner of Iberia. If I understand in the right way, your belief it�s my clade was bigger 2.100 years ago, but something made it almost dissappears inside its core origin area (Eastwards Alps), only flourishing in some Hallstatt migrating areas like North Italy or Western Iberia?
Hi Davidtab,
Are you the "new" sample on current YFULL version ?
https://www.yfull.com/tree/J-FT273354/
If not, it would be interesting to look at when you splitted from the Brazilian sample (likely of Iberian origin too.)
Regarding the "path" of BY162321, it likely participated to a southern Hallstatt expansion circa 900 BCE (which is consistent with finding it in La Tène horizon by 300 BCE).
Some modern clades ended in Greece, some other in Iberia.
But without more samples, it is hard to say more about "how/when" it ended in Iberia.
Sadly Spain, like France, is poorly sampled with DNA tests. Thus we don't know much about "when" potential subclades diversified.
With time and a better sampling of spain, we may be able to have some hints about "when" it arrived.
But probably more BY162321 are hidding in Spain and France.
Above BY162321, Z38240 (and even Y15058 more generally) appeared to have experienced a big diffusion around 1800-1700 BCE.
My current, favorite model involves this diffusion occuring from eastern Alps.
By EIA, Z38240 is diffused all over north-western Balkans, north Italy, and eastern Alps.
Dispersion occured in two phases : the 1800-1700 BCE expansion, and a BA-collapse-related event (possibly a post-bottle-neck recovery). Entrance in Etruria is tricky to handle, it could have arrived "early" or way later with the 900 BCE expansion for instance.
Your clade likely was in the northern part of Y15058 area since its expansion and later fell under Hallstatt/La Tène influence.
The Italian and the Sardinian sample below BY161113 splited near the moment of the Z38240 expansion. It is not very surprising to find them in the whole Z38240 area (and they didn't say much more about BY262321 post Z38240 stage).
The Italian sample from Bari may involves some relation with the IA Daunians, but without more samples it is hard to estimate "when" it settled there.
The Patterson et al. 2021 paper is gold for your clade, as it revealed a very wide area of diffusion illustrating how your paternal line and cousin branches where dominating the region during EIA (and likely since MBA).
Then for your specific clade, I think there is little to no doubts of a Hallstatt-La Tène relation around 900 BCE.
After that, we need more samples to know if it arrives "early" in Spain (diffused by Celts) or if it is a later injection following another population movement.
Good research, hopefully some new samples on your branch (either modern or ancient will pop-out soon)
.
G.
