What Is Sicilian DNA? A Look at Its Unique Genetic History

Sicilian DNA is the genetic product of at least 15,000 years of migration, conquest, and mixing on an island that has served as a crossroads of the Mediterranean. Ancient DNA studies have revealed that the people living on Sicily today carry layered ancestry from Ice Age hunter-gatherers, early Neolithic farmers who arrived from the eastern Mediterranean, Bronze Age pastoralists with roots in the Eurasian steppe, Greek and Phoenician colonists, North African populations from the medieval Arab period, and several other groups besides. What makes the Sicilian genetic story distinctive is not any single ancestral thread but the sheer number of sharp transitions, some amounting to near-complete population replacements, packed into the history of one island.

Ice Age Hunters and the Earliest Genetic Layer

The deepest layer of Sicilian DNA traces back to Upper Paleolithic hunter-gatherers who inhabited the island roughly 14,000 to 15,000 years ago. Skeletal remains from San Teodoro cave in northeastern Sicily have been sequenced and placed within a broader cluster of western European Mesolithic hunter-gatherers. These individuals clustered most closely with another Late Epigravettian individual from Sicily, known as Oriente C, and with Late Upper Paleolithic and Mesolithic individuals from Grotta Continenza on the Italian mainland, pointing to a shared gene pool among post-glacial hunter-gatherers across the Italian peninsula from about 14,000 years ago onward.¹

A more detailed picture has come from Grotta dell’Uzzo in western Sicily, where researchers recovered DNA from individuals spanning the Early Mesolithic (around 10,750 years ago) through the Late Mesolithic (about 8,650 to 7,790 years ago). The oldest Uzzo individuals fell within the same western European hunter-gatherer cluster as Oriente C and carried mitochondrial lineages within the U2′3′4′7′8′9 branch, a lineage also reported for an even older Gravettian individual from mainland Italy. They shared an unusually large amount of genetic drift with each other compared to other hunter-gatherers in Europe, suggesting that Sicily’s Mesolithic population was somewhat isolated, drifting genetically on its own track even while remaining broadly part of the Italian hunter-gatherer world.²

The Neolithic Transition and a Near-Complete Population Replacement

Around 6,000 BCE, farming arrived in Sicily, and with it came people whose ancestry looked nothing like the island’s existing inhabitants. The earliest Sicilian farmers (labeled “Sicily EN” in the genetic literature) cluster not with the preceding local hunter-gatherers but with Early Neolithic farmers from the Balkans, Greece, and central Europe. Their genetic profile closely matches that of other European Early Farmers whose ultimate origin traces back to Anatolia. In contrast, these first Sicilian farmers showed relatively little affinity with contemporary populations along the western Mediterranean coast in France, Iberia, or northwestern Africa.²

This was not a gradual cultural adoption where local foragers learned to farm. Statistical tests confirmed a major turnover of genetic ancestry during the Mesolithic-to-Neolithic transition, mirroring what happened across much of Europe. Yet the replacement was not absolute. Admixture modeling estimated that the preceding Late Mesolithic Sicilian hunter-gatherers contributed about 7.5% of the ancestry to the island’s early farming gene pool. So while the genetic landscape was overwhelmingly transformed, a small but detectable thread of the old forager population persisted.²

Analysis of mitochondrial DNA from 116 ancient individuals spanning roughly 14,700 to 545 years ago has independently confirmed this discontinuity. Two specific maternal lineages, U5b and U8b/K, serve as genetic markers of the Paleolithic-to-Neolithic break, appearing at high frequency in the older forager samples and then largely vanishing as farming populations arrived.³

Bronze Age Arrivals from the Steppe and Eastern Mediterranean

If the Neolithic was Sicily’s first great genetic overhaul, the Bronze Age brought the next. By around 2200 BCE, ancestry linked to steppe pastoralists from the Pontic-Caspian region had reached the island. Part of this steppe-related ancestry arrived through an unexpected route: Iberia, meaning it traveled west across Europe before reaching Sicily rather than coming directly from the east. By the mid-second millennium BCE, a second wave of ancestry with Iranian-related genetic affinity also appeared, coinciding with its documented spread into the Aegean. And then came yet another dramatic shift: large-scale population replacement after the Bronze Age reshaped Sicily’s genetic makeup yet again.⁴

These layers matter because they form the genetic backbone of the population that Greek and Phoenician colonists would eventually encounter. By the time classical antiquity began, Sicilians already carried a complex mixture of Early Farmer, steppe, and eastern Mediterranean ancestry, a combination distinct from populations on the Italian mainland or in North Africa.

Greek Colonization and Sex-Biased Migration

The Greek colonization of Sicily, concentrated in the eighth to fifth centuries BCE, is one of the island’s most celebrated historical chapters, and it left a clear genetic fingerprint. A study using haplotype analysis recovered an unambiguous signature of Greek ancestry in eastern Sicily compatible with settlement from the Greek island of Euboea during the Archaic Period.⁵

The same study inferred moderate sex bias in the colonizing population: the estimated number of breeding migrants was a few thousand men but only a few hundred women. This imbalance is consistent with the historical understanding of Greek colonial expeditions as predominantly male ventures, with colonists often taking local partners upon arrival. The researchers also cautioned that earlier attempts to quantify Greek genetic contributions simply by counting the proportion of specific lineages in modern populations could be misleading, since those lineages can enter through multiple routes and periods, not just the Archaic Greek colonization.⁵

Phoenicians, Punic Networks, and a Surprising Finding

While the Greeks dominated eastern Sicily, Phoenician and later Carthaginian (Punic) influence was concentrated in the island’s west. A common assumption has been that Punic settlements carried substantial Levantine ancestry, given the Phoenician origin of their culture. Genetic evidence tells a very different story. A large ancient DNA study of Punic populations across the central and western Mediterranean found that Levantine Phoenicians made little genetic contribution to these communities between the sixth and second centuries BCE. Instead, the people who inherited Levantine Phoenician culture, language, and religion derived most of their ancestry from a genetic profile resembling that of Sicily and the Aegean.⁶

North African ancestry, reflecting Carthage’s growing influence, was present but remained a minority contributor at all sampled Punic sites, including Carthage itself. In practical terms, this means western Sicily’s Punic period left a genetic signature that looks less “Levantine” and more like a local Mediterranean population that had adopted Phoenician cultural practices. The distinction matters for anyone interpreting their own ancestry results: a genetic connection to “Punic” populations is largely a connection to the existing Sicilian and Aegean gene pool of the time, not to ancient Lebanon.⁶

The Arab Period and North African Ancestry

Sicily was under Arab rule from the ninth to the eleventh century CE, and the genetic legacy of this period has been a subject of considerable debate. Y-chromosome studies have identified specific Northwest African haplogroups in modern Sicilians, and the frequencies are higher than on the Italian mainland, consistent with historical records of Arab and Berber settlement.⁷

Ancient DNA from medieval Palermo has added texture to this picture. At La Gancia, a burial site in Palermo, two male individuals plotted squarely within the genetic diversity of modern North African populations and carried the characteristically North African Y-chromosome haplogroup E1b-M81.⁸ A separate bioarchaeological study of medieval Sicilian cemeteries found that individuals from a Muslim cemetery carried haplogroups associated with North Africa and the Eastern Mediterranean, while those from a nearby Christian cemetery predominantly carried haplogroup R1b-M269, which is typical of Western Europe.⁹

Yet the long-term genetic impact of the Arab period on the modern Sicilian population appears to have been limited. A comprehensive study of uniparental genetic markers in Sicily and southern Italy found that the typically Maghrebin E-M81 lineage occurred at only about 1.5% in the combined southern Sicilian and Italian dataset, and the characteristic North African core haplotype appeared in just two out of five E-M81 individuals sampled. The researchers concluded that trans-Mediterranean gene flows had only a marginal impact on the current genetic pool of southern Sicily and Italy.¹⁰ The most likely explanation is that the Norman conquest of Sicily in the late eleventh century, followed by forced conversions and expulsions, greatly reduced the Arab-descended population over a few generations, diluting much of the genetic signal that would otherwise persist today.

Linguistic Minorities and Balkan Connections

One underappreciated genetic layer in Sicily comes from the Arbereshe, Albanian-speaking communities that settled in southern Italy and Sicily mainly in the fifteenth and sixteenth centuries, fleeing Ottoman expansion. Genetic studies using haplotype-sharing analysis confirm that these communities retain recent shared ancestry traceable to their Balkan source populations, with Albania flagged as the origin of the gene flow that distinguishes them from surrounding Italian-speaking populations.¹¹

Interestingly, the Arbereshe communities of Calabria and those of Sicily show somewhat different haplotype-sharing patterns, reflecting their diverging population histories after settlement. These small communities have maintained a degree of genetic distinctiveness from their neighbors for centuries, partly because of cultural and linguistic endogamy. They represent a reminder that “Sicilian DNA” is not a single uniform entity even within the island; local communities can carry distinctive genetic signatures tied to specific, relatively recent migration events.

Consanguinity and the Island’s Demographic Structure

A frequently overlooked aspect of Sicilian genetics is the island’s historically high rate of consanguineous marriage. Data from Catholic Church marriage dispensations have shown that Sicily had the highest proportion of consanguineous marriages in all of Italy, with rates of uncle-niece marriages at 0.3% and first-cousin marriages at about 4.5%.¹² This pattern reflected a highly fragmented landscape of isolated communities, particularly in the mountainous interior, where geographic barriers limited marriage pools for centuries.

The genetic consequence of this is a higher proportion of homozygous individuals, meaning people who inherited identical gene variants from both parents. This has practical implications for certain inherited conditions. In the province of Trapani in western Sicily, a study of over 2,400 individuals found a complex landscape of thalassemia mutations, with eight distinct alpha-globin gene mutations and twelve beta-globin mutations identified. The most common alpha-thalassemia variant, the -α3.7 deletion, accounted for about three-quarters of alpha-thalassemia cases, while the beta-globin codon 39 nonsense mutation accounted for about 38% of beta-thalassemia cases.¹³ These thalassemia variants are widely understood to have been maintained by natural selection because carriers (people with one copy of the mutation) have some protection against malaria, a disease that was endemic in Sicily’s lowlands until the mid-twentieth century.

Lactose Tolerance and Dietary Adaptation

Another genetic trait that varies geographically across Europe and connects to Sicily’s history is lactose tolerance in adults. The ability to digest milk after childhood is genetically determined and was essentially absent in all human populations until dairy farming created a selective advantage for it. The prevalence of adult lactose intolerance (technically called hypolactasia) ranges from under 5% in parts of northwestern Europe, where dairy farming has the deepest roots, to nearly 100% in parts of East Asia.¹⁴ Southern Italy and Sicily fall somewhere in the middle of this spectrum, with lactose intolerance rates considerably higher than in Scandinavia or the British Isles but lower than in populations with little pastoral history. This intermediate position reflects Sicily’s mixed ancestry: the Neolithic farmers who transformed the island’s gene pool were early adopters of agriculture but not necessarily intensive dairy consumers, and the later steppe pastoralist ancestry that arrived during the Bronze Age would have brought some degree of lactase persistence with it.

Sicily and Malta as Genetic Neighbors

The genetic story of Sicily does not stop at the island’s coastline. Malta, lying just 80 kilometers to the south, shares a particularly close genetic relationship. Analysis of mitochondrial DNA from the Maltese population has shown clear matrilineal affinity between Malta and Sicily, with the two populations clustering together in principal component analyses and sharing some mutations exclusively with each other.¹⁵ This genetic closeness confirms longstanding historical, linguistic, and archaeological evidence for tight links between the two islands stretching back to prehistory.

Ancient DNA from Malta’s Xagħra Circle, a Neolithic burial complex, has shown that Malta’s earliest well-documented inhabitants shared the highest levels of genetic drift with Early Neolithic populations of Italy and Greece, followed by Middle Neolithic and Chalcolithic populations from Italy and Sicily.¹⁶ In other words, the same wave of Neolithic farmers that transformed Sicily’s genetic landscape also colonized Malta, and the two islands have remained genetically intertwined ever since. For people of Maltese descent exploring their ancestry, Sicily often appears as a primary genetic reference population, and this deep shared history is why.

What Consumer DNA Tests Can and Cannot Tell You

If you take a consumer ancestry test and receive results labeled “Southern Italian” or “Sicilian,” what you are seeing is a statistical comparison of your DNA to modern reference populations. These tests can reliably place your ancestry in the broader southern Italian and Sicilian region, but they cannot decompose it into its historical layers. You will not see separate slices labeled “Neolithic farmer,” “Bronze Age steppe,” or “Greek colonist” because those ancestries blended so long ago that they are inseparable in modern genomes using the methods commercial companies employ.

The academic studies cited throughout this article use ancient DNA as reference points, a process that requires access to sequenced prehistoric genomes and specialized statistical software. Consumer tests, by contrast, compare your DNA to living people. The practical consequence is that a Sicilian’s test results may show small percentages of “North African,” “Eastern Mediterranean,” or “Anatolian” ancestry, reflecting genuine deep historical connections, but the exact percentages should be taken as rough impressions rather than precise measurements. Companies update their reference panels periodically, and your percentage breakdowns can shift from one update to the next without any change in your actual DNA.

One thing consumer tests do capture reasonably well is within-island variation. Eastern Sicily, the zone of heaviest Greek colonization, tends to show slightly more affinity with modern Greek populations than western Sicily does. Western Sicily, with its deeper Punic and Arab historical ties, can show marginally more affinity with North African and eastern Mediterranean reference populations. These east-west patterns are subtle and probabilistic, not categorical, but they are real enough to appear in population-level genetic studies. If your family comes from a specific Sicilian province, your results may lean in ways that loosely reflect that part of the island’s particular history of settlement.

1
Communications Biology. Genomic ancestry, diet and microbiomes of Upper Palaeolithic hunter-gatherers from San Teodoro cave
2
iScience. What Is Sicilian DNA? A Look at Its Unique Genetic History – Section: Results
3
PubMed Central. Fifteen millennia of human mitogenome evolution in Sicily
4
Nature Ecology & Evolution. The spread of steppe and Iranian-related ancestry in the islands of the western Mediterranean
5
PubMed Central. The Greeks in the West: genetic signatures of the Hellenic colonisation in southern Italy and Sicily
6
PubMed Central. Punic people were genetically diverse with almost no Levantine ancestors
7
PubMed Central. Moors and Saracens in Europe: estimating the medieval North African male legacy in southern Europe
8
PLoS One. Genetic histories of individuals from multi-faith medieval Sicily – Section: Results
9
PubMed Central. Multi-proxy bioarchaeological analysis of skeletal remains shows genetic discontinuity in a Medieval Sicilian community – Section: Results and discussion
10
PLoS ONE. An Ancient Mediterranean Melting Pot: Investigating the Uniparental Genetic Structure and Population History of Sicily and Southern Italy – Section: Results
11
PubMed Central. Ancient and recent admixture layers in Sicily and Southern Italy trace multiple migration routes along the Mediterranean – Section: Ethno-linguistic heritage and genetic ancestry of Italian Arbereshe and Greek-speaking minorities
12
Elsevier / Journal of Cultural Heritage. Towards a genetic history of Sicily
13
PubMed Central. A Particular Focus on the Prevalence of α- and β-Thalassemia in Western Sicilian Population from Trapani Province in the COVID-19 Era
14
Taylor & Francis Online (Scand J Gastroenterol Suppl). Genetics and epidemiology of adult-type hypolactasia
15
ResearchGate. The Genetic Heritage of the Maltese Islands: A Matrilineal Perspective – Section: Discussion
16
Current Biology. Ancient Genomes Reveal Insular Evolution in the Bronze Age Eastern Mediterranean – Section: Results and discussion