Recently published: "Paternal lineages in southern Iberia provide time frames for gene flow from mainland Europe and the Mediterranean world"

Background: The geography of southern Iberia, and an abundant archaeological record of human occupation, are ideal conditions for a full understanding of scenarios of genetic history in the area. Recent advances in the phylogeography of Y-chromosome lineages offer the opportunity to set upper bounds for the appearance of different genetic components. Aim: To provide a global knowledge on the Y haplogroups observed in Andalusia with their Y microsatellite variation. Preferential attention is given to the vehement debate about the age, origin and expansion of R1b-M269 clade and sub-lineages. Subject and methods: 414 male DNA samples from western and eastern autochthonous Andalusians were genotyped for a set of Y-SNPs and Y-STRs. Gene diversity, potential population genetic structures and coalescent times were assessed. Results: Most of the analysed samples belong to the European haplogroup R1b1a1a2-M269 whereas haplogroups E, J, I, G, and T show lower frequencies. A phylogenetic dissection of the R1b-M269 was performed and younger time frames than those previously reported in the literature were obtained for its sub-lineages. Conclusion: The particular Andalusian R1b-M269 assemblage confirms the shallow topology of the clade. Moreover, the sharing of lineages with the rest of Europe indicates the impact in Iberia of an amount of pre-existing diversity, with the possible exception of R1b-DF27. Lineages such as J2-M172 and G-M201, highlight the importance of maritime travels of early farmers who reached the Iberian Peninsula.

some quotations:

The notably high frequency of R1b-M529 in the Huelva province (14%), nearly two times higher than those observed in other mainland Iberian populations (0-7%), depicts a specific geographic pattern of this lineage. R1b-M529 is widely disseminated over the European Atlantic coasts, with the highest frequencies (20-50%) in the British Isles, Ireland and north-western France (Valverde et al. 2016; Solé-Morata et al. 2017).

With this in mind, the observed J1-M267 in the Iberian Peninsula is most likely a consequence of the migration of Arabic populations during the Islamic expansion. The J2-M172 seems to be related, however, to the Greek and Phoenician colonies that were established in the Peninsula due to commerce that was mainly linked to mining-related wealth and the
accompanying maritime trades.

In addition, strong dissimilarities appear between the highest frequencies observed for R1b-M269 in the West against the highest diversities detected in the East of the continent. With this evidence, the highest Y-haplotype microsatellite
diversities and variances could not be attributed to the place of origin of a lineage. Furthermore, by considering the specific phylogeographic patterns displayed by some R1b-M269 sub-lineages, the eastern origin attributed to the Y-C haplogroup R1b-M269 is quite unlikely.

Thus, our results would allow the expansion of the DF27 lineage to be moved back from the Bronze Age.

Y-DNA Huelva Granada
E-M81 3% - 3.6%
other E 9% - 3%
G 7.2% - 4.4%
I1 1.2% - 4.8%
I2 3.6% - 4.8%
J-M267 2.4% - 2.8%
other J 5% - 6.5%
L1 + Q 1.2% - 1.2%
R1a 1.8% - 1.6%
R1b 59.6% - 61.8%

from the total, 11 individuals were basal M269 (2.5%), also four in ten are DF27