Showing posts with label Italy. Show all posts
Showing posts with label Italy. Show all posts

Persistence of Lombard Y chromosomes in old Northern Italian families?

Traces of medieval migrations in a socially stratified population from Northern Italy. Evidence from uniparental markers and deep-rooted pedigrees.

Heredity (Edinb). 2015 Feb;114(2):155-62

Authors: Boattini A, Sarno S, Pedrini P, Medoro C, Carta M, Tucci S, Ferri G, Alù M, Luiselli D, Pettener D

Abstract

Social and cultural factors had a critical role in determining the genetic structure of Europe. Therefore, socially stratified populations may help to focus on specific episodes of European demographic history. In this study, we use uniparental markers to analyse the genetic structure of Partecipanza in San Giovanni in Persiceto (Northern Italy), a peculiar institution whose origins date back to the Middle Ages and whose members form the patrilineal descent of a group of founder families. From a maternal point of view (mtDNA), Partecipanza is genetically homogeneous with the rest of the population. However, we observed a significant differentiation for Y-chromosomes. In addition, by comparing 17 Y-STR profiles with deep-rooted paternal pedigrees, we estimated a Y-STR mutation rate equal to 3.90 * 10(-3) mutations per STR per generation and an average generation duration time of 33.38 years. When we used these values for tentative dating, we estimated 1300-600 years ago for the origins of the Partecipanza. These results, together with a peculiar Y-chromosomal composition and historical evidence, suggest that Germanic populations (Lombards in particular) settled in the area during the Migration Period (400-800 AD, approximately) and may have had an important role in the foundation of this community.

http://dx.doi.org/10.1038/hdy.2014.77

Autosomal DNA from 2,500-year old Etruscans

Dienekes points to a Biology of Genomes poster ("Assessment of Whole-Genome capture methodologies on single- and double-stranded ancient DNA libraries from Caribbean and European archaeological human remains") that includes a PCA with a few Etruscan samples (the poster text mentions two samples, but the PCA includes three).

If you imagine a line running from the American and British samples (CEU and GBR) through the Spanish (IBS) and Tuscan (TSI) samples, I expect Southern Italian samples would be out past Tuscans on this line and Middle Easterners would be beyond Southern Italians.

The Etruscan samples are shifted north and/or west relative to modern Tuscans (exactly the opposite of what we'd expect if Etruscans had predominantly Near Eastern origins). Since, in the absence of other gene flow, Italic, Celtic, and Germanic admixture in Tuscany would be expected to pull Tuscans north/west relative to Etruscans, it's clear Tuscany has been influenced by southern/eastern gene flow within the past 2,500 years (with potential sources including Roman slaves, medieval slaves, Jews, and southern Italians).

Near Eastern admixture in Tuscany: signal of Etruscans, or medieval slaves?

Mitogenomes from The 1000 Genome Project Reveal New Near Eastern Features in Present-Day Tuscans
Background

Genetic analyses have recently been carried out on present-day Tuscans (Central Italy) in order to investigate their presumable recent Near East ancestry in connection with the long-standing debate on the origins of the Etruscan civilization. We retrieved mitogenomes and genome-wide SNP data from 110 Tuscans analyzed within the context of The 1000 Genome Project. For phylogeographic and evolutionary analysis we made use of a large worldwide database of entire mitogenomes (>26,000) and partial control region sequences (>180,000).

Results

Different analyses reveal the presence of typical Near East haplotypes in Tuscans representing isolated members of various mtDNA phylogenetic branches. As a whole, the Near East component in Tuscan mitogenomes can be estimated at about 8%; a proportion that is comparable to previous estimates but significantly lower than admixture estimates obtained from autosomal SNP data (21%). Phylogeographic and evolutionary inter-population comparisons indicate that the main signal of Near Eastern Tuscan mitogenomes comes from Iran.

Conclusions

Mitogenomes of recent Near East origin in present-day Tuscans do not show local or regional variation. This points to a demographic scenario that is compatible with a recent arrival of Near Easterners to this region in Italy with no founder events or bottlenecks.

Something I never see mentioned in these papers attempting to make inferences about the origins of Etruscans based on genetic variation in modern Tuscans:
Until recently, slaves have been invisible in the literature on medieval Tuscany, leading scholars to overlook them as a means of contact with the east. Historians abandoned this assumption when Giulio Prunai and Iris Origo documented the importation of hundreds of slaves to the region, conclusively demonstrating that the institution was widespread in medieval Tuscany.

[Michael P. Kucher. The Water Supply System of Siena, Italy: The Medieval Roots of the Modern Networked Cities.]

THE DOMESTIC ENEMY: THE EASTERN SLAVES IN TUSCANY IN THE FOURTEENTH AND FIFTEENTH CENTURIES:
Introduction. Among the unfamiliar minor episodes of history - those shadowy backwaters which so often repay exploration - there is one that is little known even by students of mediaeval Florence: the story of the slaves brought to Tuscany from the Black Sea and from Africa, during the fourteenth and fifteenth centuries, who came to form no inconsiderable proportion of the Florentine population. A traveller arriving in Tuscany at this time might well have been startled by the appearance of the serving-maids and grooms of the Florentine ladies. Mostly small and squat, with yellow skins, black hair, high cheek-bones and dark slanting eyes, many of them deeply marked by smallpox and by scars or tattooed patterns on their faces, they certainly seemed to belong to a different race from the Florentine. Sometimes, too, a lady would be attended by a negro, or by a taller, fair-haired woman, white-skinned, but also unmistakably foreign; and if the traveller had friends in one of the Florentine palazzi and went to call, he found several other exotic figures there, too: swarthy or yellow little girls of eleven or twelve, and sometimes a small Moorish boy, acting as nursemaids or playmates for the little Florentine merchant-princes.

All these were slaves: most of them Tartars, but some also Russian, Circassian or Greek, Moorish or Ethiopian. Every prosperous noble or merchant had at least two or three of them; many had more. Even a notary's wife, or a small shopkeeper's, would have at least one, and it was far from uncommon to find one among the possessions of a priest or nun. [. . .]

Where had they all come from? Who were they? And - we may add - what was the part they played in the domestic life of Tuscany? The answer to these questions forms a curious story. It may be pieced together from deeds of sale and enfranchisements and wills, from the ledgers of foundling hospitals, from the bills of lading of trading-ships, from court records and judgments and city stat- utes, from private letters and diaries and account-books. Out of all these docu- ments a picture emerges of a whole underworld of alien, uprooted creatures - the "displaced persons" of their time. Sometimes a few of them succeeded in escaping from servitude - but often only to form the dregs of the predatory population of outlaws who lived by robbery on the Tuscan roads, or who swelled the crowd during bread riots or political tumults. And by far the greater number of them remained (often even after enfranchisement), in their masters' houses, the necessary background of every domestic scene, speaking a curious half-in- comprehensible jargon, waiting at every table, listening at every door, and mingling (as to this, the records leave us no doubt) their blood with that of their Tuscan hosts. Domestici hostes, domestic enemies - that was Petrarch's name for these inmates of every household, so alien and yet so close, and the author of a treatise of domestic economy in Sicily, Caggio, held the same opinion. "We have," he wrote, "as many enemies as we have slaves."

The interest of this forgotten episode of history is a double one - social and ethnical. On the one hand it is curious to discover that Florentine society during the last centuries of the Middle Ages depended, even if to a lesser degree than that of Athens and Rome, on services of men who were un-free. Beneath the co- operative associations of the guilds - the Arti Maggiori e Minori - beneath even the oppressed, hungry rabble of the popolo minuto, the Tuscan cities held another class- made up of men and women without human or legal rights, without families of their own, without any recognized ties between them, with- out even a name, save that given to them by their master: the slaves.

Moreover, and perhaps this is the most interesting point- they came to form a sufficiently large proportion of the population to affect, by this strong alien infiltration, the Tuscan stock- and, perhaps, the Tuscan character. Many widely different strains had already contributed to the formation of the Tuscan people: Etruscan, Roman, Lombard, Frankish. And now there came this new blood from the East and, later on, from Africa - vigorous and vital, di genteferigna.* From the cities it spread - since slaves, as we shall see, were kept even in remote country villages - throughout the whole of Tuscany. We may see their features in many of the pictures of the time. To this day, if you watch a group of children squatting in a semicircle in the dust of a village street, their voices and hands upraised in the old Mediterranean game of morra, you will some- times see among them the crisp black curls, the dark skin and flashing eyes of an Arab boy, or the high cheek-bones and slanting eyes of a little Tartar.

[Iris Origo. The Domestic Enemy: The Eastern Slaves in Tuscany in the Fourteenth and Fifteenth Centuries. Speculum / Volume 30 / Issue 03 / July 1955, pp 321-366.]

Haplogroups as evolutionary markers of cognitive ability

A reader emails a link (pdf) to a recent paper from Rindermann:
Studies investigating evolutionary theories on the origins of national differences in intelligence have been criticized on the basis that both national cognitive ability measures and supposedly evolutionarily informative proxies (such as latitude and climate) are confounded with general developmental status. In this study 14 Y chromosomal haplogroups (N = 47 countries) are employed as evolutionary markers. These are (most probably) not intelligence coding genes, but proxies of evolutionary development with potential relevance to cognitive ability. Correlations and regression analyses with a general developmental indicator (HDI) revealed that seven haplogroups were empirically important predictors of national cognitive ability (I, R1a, R1b, N, J1, E, T[+L]). Based on their evolutionary meaning and correlation with cognitive ability these haplogroups were grouped into two sets. Combined, they accounted in a regression and path analyses for 32–51% of the variance in national intelligence relative to the developmental indicator (35–58%). This pattern was replicated internationally with further controls (e.g. latitude, spatial autocorrelation etc.) and at the regional level in two independent samples (within Italy and Spain). These findings, using a conservative estimate of evolutionary influences, provide support for a mixed influence on national cognitive ability stemming from both current environmental and past environmental (evolutionary) factors.
The association with cognitive ability is positive for haplogroups I, R1a, R1b, and N and negative for J1, E, and T[+L], a pattern that also holds within Spain and Italy.
I1 arose in southern Scandinavia between 4000 and 6000 years ago (Rootsi et al., 2004). R1a and R1b arose in southwestern Asia (Caucasus, Pontic–Caspian steppe, Kurgan culture) around 22,000 ybp or somewhat later at 18,500 ybp. N and its relevant European subclades arose in Siberia and central Asia 12–27,000 ybp (Rootsi et al., 2007). This suggests that these environments may have been evolutionarily significant for cognitive ability: The presence of environmental harshness (i.e. extreme winter cold) suggests that factors relevant to the cold winters theory could have contributed to an increase in intelligence among the ancestors of those possessing these haplogroups. It is also likely that factors such as the development of agriculture, tools and dairy farming (milk from horses and cattle around 6000 ybp) were themselves an evolutionary catalyst for increasing cognitive ability (Cochran & Harpending, 2009; Hawks, Wang, Cochran, Harpending, & Moyzis, 2007; Wade, 2006), possibly enhancing neurological maturation via the provision of better nutrition during pregnancy, in youth and adulthood. The Neolithic transition to agriculture in cold climates would have been particularly evolutionarily demanding in terms of the need for heightened cognitive resources (e.g. farsightedness and planning).

[. . .]

Finally the steppe presents an unprotected environment, people living in such an environment are different to the people living in mountains, near to large oceans, in dense forests or in oases surrounded by large deserts, as they are permanently in danger of being attacked by neighboring peoples. This challenge could have selected for enhanced military preparedness a component of which may have been higher cognitive ability.

Y haplogroup R1b and light hair in Italy

Via Italian Wikipedia.
 

Update addressing some questions/comments:

(1) The map specifically shows the frequency of blond hair; so yes the frequency of light hair in general will be higher.

(2) The map is adapted from Biasutti's Razze e popoli della Terra. The data was originally collected by Ridolfo Livi in 1859-1863.

(3) The Biasutti/Livi map shows a higher frequency of blond hair in Corsica than in Sardinia. In keeping with the apparent pattern elsewhere in Italy, the frequency of R1b appears to be markedly higher in Corsicans than in Sardinians (in this paper, "HG 1" in combination with "HG 22" roughly corresponds to R1b).

(4) "Does R1b necessarily correlate with light hair?" In Italy it pretty clearly does. If you mean am I suggesting a strict correspondence between light hair and haplogroup R1b, obviously I am not. Looking at Europe as a whole, I doubt much of a correlation exists. But the evidence is consistent with the bearers of R1b (or more specifically subclades of R-L11) being lighter than the previous inhabitants of Italy. This doesn't mean the original carriers of R-M417 and some subclades of I weren't probably also lighter-haired, or that as R1b spread throughout Europe and mixing occurred, R1b always remained associated with light hair. It does tend to add yet more weight against attempts to link R1b in Europe to migration of Neolithic farmers from Anatolia, but dispensing with that question for good awaits large, high-resolution studies of ancient and modern DNA.

"haplogroup R1b is found in some of it's highest concentrations among European peoples in Spain and Portugal -- two countries hardly known for blondes."

Within Iberia, though, it's certainly possible the pattern will hold. Among Iberians, Basques have some of the highest frequencies of both R1b and blondism. According to Coon: 'The French Basques are by no means all brunet; Collignon finds 22 per cent of blue eyes, 44 per cent of "medium," and 34 per cent of dark. Black hair is found in 7 per cent of the group, brown in 77 per cent, and light brown to blond in 16 per cent. Among the Spanish Basques the incidence of blondism is somewhat lower, but the Basques are still light when compared to most other inhabitants of Spain.'

North-South IQ differences in Italy

Via Mangan's, a paper from Richard Lynn entitled "In Italy, north–south differences in IQ predict differences in income, education, infant mortality, stature, and literacy":
Regional differences in IQ are presented for 12 regions of Italy showing that IQs are highest in the north and lowest in the south. Regional IQs obtained in 2006 are highly correlated with average incomes at r=0.937, and with stature, infant mortality, literacy and education. The lower IQ in southern Italy may be attributable to genetic admixture with populations from the Near East and North Africa.
Lynn calculates average IQs ranging from 89 in Sicily to 103 in Friuli-Venezia.

HLA in Sicilians

Since HLA genes constitute a relatively tiny portion of the genome and are subject to strong selection pressure, I give comparatively little weight to population affinities derived from HLA haplotypes. The following study may be worth reading mainly for the historical overview. It would be useful to conduct a similar study using high-resolution SNP genotypes.

HLA Class I and Class II Polymorphism in Three Sicilian Populations

Two human leukocyte antigen (HLA) class I loci (HLA-A and HLA-B) and one class II locus (HLA-DR) were typed at the DNA level in the Sicilian population. Study participants were of Sicilian origin (183 for class I loci and 260 for class II loci) and live in three towns, chosen on the basis of geographic position and different historical events. These towns are Sciacca (southwest Sicily, located at sea level, conquered by Arabs in A.D. 814), Piana degli Albanesi (northwest Sicily, 720 m above sea level, has maintained religious, cultural, and linguistic peculiarities traced to Albanian settlement in 1488), and Troina (northeast Sicily, 1,120 m above sea level, known as the first settlement of Normans). The assumptions underlying the study of genetic structure, based on HLA allele polymorphism, are that these three towns are located in areas that can be distinguished according to historical criteria and that they are likely to have contributed to cultural and probably genetic differences. As such, the high frequency of some alleles in Sciacca and Troina seems to be correlated with Greek, Phoenician, North African, and Arab influence. In accordance with different human settlements in Sicily, we found that the HLA allele frequencies support the existence of genetic differentiation between the western and eastern sides of Sicily. This separation is attributed to Greek colonization in the east and to Phoenician-Carthaginian-Arab influence in the west. Moreover, the comparisons of all allele frequencies between Mediterranean and African populations show the same trend, highlighting in some cases European origin and in other cases non-European origin.

[. . .]

Sciacca is located on the southwestern side of Sicily and belongs to the province of Agrigento. Its origin has been traced as far back as 628 B.c. The mythical founder of the city is said to have been Kokalos, king of the Sicani. Sciacca is one of the most ancient thermal resorts in the Mediterranean. It was known in Siceliot times for its sweating caves and for its thermal waters, and the Romans gave it the name Thermae Selinuntinae, or Aquae Larodae. In A.D. 814 Arabs conquered Sciacca and called it as-Shaqqah (hence the current name Sciacca). Arab domination seems to have had a strong genetic impact, in that it modified the demographic distribution of the town. The urban structure also gives evidence of a later settlement of a large Jewish community inside the quarter of Cadda, which had a near monopoly on dyeing and silk weaving.

Hum Biol. 2007 Jun;79(3):339-54.

(full text)