8 February 2025 The Future is the Product of the Past

New study investigates the development of the Scandinavian gene pool over the latest 2000 years

A new study resolves the complex relations between geography, ancestry, and gene flow in Scandinavia – encompassing the Roman Age, the Viking Age, and later periods.

Researchers investigated a 2,000-year genetic transect through Scandinavia spanning the Iron Age to the present, based on 48 new and 249 published ancient genomes and genotypes from 16,638 modern individuals.

A surprising increase of variation during the Viking period indicates that gene flow into Scandinavia was especially intense during this period.

An international study coordinated from Stockholm and Reykjavik investigates the development of the Scandinavian gene pool over the latest 2000 years. In this effort the scientists relied on historic and prehistoric genomes, and from material excavated in Scandinavia. These ancient genomes were compared with genomic data from 16,638 contemporary Scandinavians. As the geographical origin and the datings were known for all these individuals, it was possible to resolve the development of the gene pool to a level never realised previously.

Archaeological excavation at Sandby Borg. Photo: Daniel Lindskog
Archaeological excavation at Sandby Borg. Photo: Daniel Lindskog

Dr Ricardo Rodríguez Varela at the Centre for Palaeogenetics*, who analyzed all the data and extracted some of the ancient DNA used in the study, explains: “With this level of resolution we not only confirm the Viking Age migration. We are also able to trace it to the east Baltic region, the British-Irish Isles and southern Europe. But not all parts of Scandinavia received the same amounts of gene flow from these areas. For example, while British-Irish ancestry became widespread in Scandinavia the eastern-Baltic ancestry mainly reached Gotland and central Sweden.”

The gene pool bounced back after the Viking period

Another new discovery in this study was what happened to the gene pool after the Viking period. The scientists were surprised to find that it bounced back in the direction of what it looked like before the Viking period migration.

Professor Anders Götherström at the Centre for Palaeogenetics, who is a senior scientist on the study, is intrigued: “Interestingly, the non-local ancestry peaks during the Viking period while being lower before and after. The drop in current levels of external ancestry suggests that the Viking-period migrants got less children, or somehow contributed proportionally less to the gene pool than the people who were already in Scandinavia.”

Yet a new discovery was the history of the northern Scandinavian gene pool. There is a genetic component in northern Scandinavia that is rare in central and western Europe, and the scientists were able to track this component in northern Scandinavia through the latest 1000 years.

Underwater excavations of the ship Kronan. Photo: Lars Einarsson.
Underwater excavations of the ship Kronan. Photo: Lars Einarsson.

Dr Ricardo Rodríguez Varela comments, “We suspected that there was a chronology to the northern Scandinavian gene pool, and it did indeed prove that a more recent influx of Uralic ancestry into Scandinavia define much of the northern gene pool. But if it is recent, it is comparatively so. For example, we know that this Uralic ancestry was present in northern Scandinavia as early as during the late Viking period”.

Based on well-known Swedish archaeological sites

The study is based on a number of well-known Swedish archaeological sites. For example, there are genomes from the 17th century warship Kronan, from the Viking and Vendel period boat burials in the lake Mälaren Valley, and from the migration period ring fortress Sandby borg on Öland.

Anders Götherström conclude: “We were working on a number of smaller studies on different archaeological sites. And at some point it just made sense to combine them into a larger study on the development of the Scandinavian gene pool.

The study, published today in Cell, is an international effort with several collaborators, but it was led by Dr Ricardo Rodríguez Varela and Professor Anders Götherstörm at Stockholm University, and Professor Agnar Helgason, and Kristjáan Moore at deCODE in Reykavijk.

The article “The genetic history of Scandinavia from the Roman Iron Age to the present” is published in Cell.

10.1016/j.cell.2022.11.024

Cover Photo: Sandby borg archaeological excavations. DANIEL LINDSKOG

Related Articles

4 Aztec child burials unearthed in Mexico and dated to the Early Colonial period may be indicators of Aztec resistance

6 July 2022

6 July 2022

During an archaeological rescue effort in Mexico City’s historic central district of La Lagunilla, the remains of an Aztec house...

Ancient stone grenades discovered at Badaling Great Wall in Beijing

16 October 2023

16 October 2023

Chinese archaeologists have unearthed 59 ancient stone grenades from the ruins of a building in the western section of the...

A Special structure Contemporary to Göbeklitepe found at Gre Fılla Höyük in Eastern Turkey

4 August 2022

4 August 2022

Pit-bottomed structures dating to the Pre-Pottery Neolithic period were found at Gre Fılla Höyük (Gre Fılla Mound) in the province...

A New Picene Prince Tomb Dating to the 7th Century BC with Two Chariots Discovered in Corinaldo, Italy

29 July 2024

29 July 2024

Following the discovery of the so-called ‘Prince of Corinaldo’ in 2018, archaeologists from the University of Bologna have discovered a...

The Largest Circular Tomb of the Ancient World Is Opening

16 February 2021

16 February 2021

The restoration of Augustus’ colossal tomb, which is expected to be opened in 2014, has been completed. The Augustus mausoleum...

An inscription written in both runic and Latin script on a church wall in Denmark turned out to be still a legally significant promissory note

31 May 2023

31 May 2023

An inscription in both runic and Latin script on a church wall in Denmark turned out to be legally valid...

Ancient Mesopotamians bred horse-like hybrids

17 January 2022

17 January 2022

New research finds that Mesopotamians were utilizing hybrids of domesticated donkeys and wild asses to drive their war wagons 4,300...

Iran wants UNESCO recognition for 56 of its historic caravansaries

10 October 2021

10 October 2021

Iran wants 56 Caravanserais from various periods, from the Sassanids (224 CE-651) to the Qajar period (1789-1925), to be included...

Archaeologists Unearth Carolingian Silver Treasure Hoard

6 May 2021

6 May 2021

A silver treasure hoard from the 9th century AD has been discovered in Poland‘s Osa and Drwęca basin. The hoard...

Southwest Germany’s Oldest Gold Artifact Found

28 May 2021

28 May 2021

Archaeologists discovered the 3,800-year-old burial of a woman who died when she was around 20 years old in what is...

8,000-year-old Cave paintings found in Türkiye’s İnkaya Cave depict life and death

10 September 2023

10 September 2023

A number of cave paintings dating back some 8,000 years have been found in İnkaya cave in the Marmara province...

Archaeologists discovered a dragon made of mussel shells in in Inner Mongolia

26 August 2023

26 August 2023

Archaeologists discovered a dragon made of mussel shells earlier this week in Chifeng, North China’s Inner Mongolia Autonomous Region, which...

A 2000-year-old Rare Artifact was Found Near Poltava

25 May 2021

25 May 2021

Scarab beetle pendant found near the Ukrainian city of Poltava. During the building of the H-31 motorway in the Poltava...

Archaeologists find a 3,000-year-old bronze sword in Germany

15 June 2023

15 June 2023

Archaeologists discovered a bronze sword more than 3,000 years old during excavations in the town of Nördlingen in Bavaria, Germany....

The earliest human remains 11,000-year-old discovered in northern Britain

25 January 2023

25 January 2023

An international team of archaeologists at the University of Central Lancashire (UCLan) has discovered 11,000-year-old human remains in the Heaning...