On the association between Uralic expansions and Y-haplogroup N

Almost all present-day populations speaking Uralic languages show moderate to high frequencies of Y-chromosome haplogroup N. I reckon there are two likely explanations for this:

- the speakers of Proto-Uralic were rich in N because they lived in an area, probably somewhere around the Ural Mountains, where it was common, and they spread it with them as they expanded from their homeland

- Uralic languages often came to be spoken in areas of North Eurasia where N was already found at moderate to high frequencies

The major exception to this rule are Hungarians, whose language belongs to the Ugric branch of Uralic. Their frequency of N is close to zero and they don't differ much in terms of overall genetic structure from their Indo-European-speaking neighbors in East Central Europe.

This is an issue that has generated much debate over the years about the nature of Uralic expansions, who the Hungarians really were, and how the Hungarian language came to be spoken in the heart of Europe.

But I never understood what the fuss was about, because based on historical sources alone it seemed rather obvious that Hungarian was introduced into the Carpathian Basin during the Middle Ages by a relatively small number of invaders from the east, probably from somewhere around the Ural Mountains, who imposed it on local Indo-European-speaking populations.

As far as I can remember, this has always been the academic consensus, and the results from one of the first ancient DNA studies of human remains soundly corroborated it. Back in 2008, Csányi et al. reported that two out of four skeletons from elite Hungarian conqueror graves dating to the 10th century carried the Tat C allele, which meant that they belonged to Y-haplogroup N (see here).

We've since had to wait over a decade to get a more comprehensive look at the Y-chromosome haplogroups of medieval Hungarians. The most useful effort to date, a manuscript courtesy of Neparáczki et al., was posted this week at bioRxiv (see here).

The results in the preprint suggest a much more complex picture than simply a migration of an obviously Uralic-speaking population rich in Y-haplogroup N into the medieval Carpathian Basin. But they do confirm the presence of N in Hungarian conqueror elites, and, in fact, of very specific subclades of N that link them to the present-day speakers of Uralic languages from around the Ural Mountains. Here are some pertinent quotes from the prepint:

Three Conqueror samples belonged to Hg N1a1a1a1a2-Z1936, the Finno-Permic N1a branch, being most frequent among northeastern European Saami, Finns, Karelians, as well as Komis, Volga Tatars and Bashkirs of the Volga-Ural region. Nevertheless this Hg is also present with lower frequency among Karanogays, Siberian Nenets, Khantys, Mansis, Dolgans, Nganasans, and Siberian Tatars 23.

...

It is generally accepted that the Hungarian language was brought to the Carpathian Basin by the Conquerors. Uralic speaking populations are characterized by a high frequency of Y-Hg N, which have often been interpreted as a genetic signal of shared ancestry. Indeed, recently a distinct shared ancestry component of likely Siberian origin was identified at the genomic level in these populations, modern Hungarians being a puzzling exception 36. The Conqueror elite had a significant proportion of N Hgs, 7% of them carrying N1a1a1a1a4-M2118 and 10% N1a1a1a1a2-Z1936, both of which are present in Ugric speaking Khantys and Mansis 23.

...

Population genetic data rather position the Conqueror elite among Turkic groups, Bashkirs and Volga Tatars, in agreement with contemporary historical accounts which denominated the Conquerors as “Turks” 38. This does not exclude the possibility that the Hungarian language could also have been present in the obviously very heterogeneous, probably multiethnic Conqueror tribal alliance.

Indeed, a large proportion of the 44 males from elite Hun, Avar and Hungarian Conqueror burials analyzed in the study belonged to Y-haplogroups that can't be plausibly associated with the earliest Uralic speakers, but rather with those of various Indo-European languages, such as I1 and R1b-U106 (these are Germanic-specific markers), I2a-L621 and R1a-CTS1211 (obviously Slavic) and R1a-Z2124 (largely Eastern Iranian).

If most of these results aren't due to contamination, then it's likely that both the early Hungarian commoners and elites were, by and large, derived from Indo-European-speaking populations. No wonder then, that present-day Hungarians are basically indistinguishable genetically from their Indo-European-speaking neighbors and, like them, show hardly any Y-haplogroup N.

See also...

Hungarian Conquerors were rich in Y-haplogroup N (Fóthi et al. 2020)

More on the association between Uralic expansions and Y-haplogroup N

Ancient DNA confirms the link between Y-haplogroup N and Uralic expansions