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Home NEWS Science News Biology

Early DNA lineages shed light on the diverse origins of the contemporary population

Bioengineer by Bioengineer
November 15, 2019
in Biology
Reading Time: 2 mins read
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Early DNA lineages from Finland shed light on the diverse origins of the contemporary population

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Credit: Stanislav Belskiy


A new genetic study carried out at the University of Helsinki and the University of Turku demonstrates that, at the end of the Iron Age, Finland was inhabited by separate and differing populations, all of them influencing the gene pool of modern Finns. The study is so far the most extensive investigation of the ancient DNA of people inhabiting the region of Finland.

In the study, genes were investigated from archaeological bone samples of more than one hundred individuals who lived between the 4th and 19th centuries AD. Most of the samples originated in the Iron Age and the Middle Ages. Mitochondrial DNA (mtDNA), which is passed down by mothers to all of their offspring, was extracted from the individuals, thus uncovering the population history of women.

Based on the findings, the people who inhabited Finland in the Iron Age (approximately 300-1300 AD) and the Middle Ages (approximately 1200-1500 AD) shared mitochondrial lineages with today’s Finns. However, significant differences were seen in the genome of individuals buried in different burial sites in the Iron Age in particular. mtDNA lineages typical of Stone Age hunter-gatherers were common among those buried in Luistari, Eura (southwest Finland), and Kirkkailanmaki, Hollola (southern Finland). In Kylalahti, Hiitola (Republic of Karelia, Russia) and Tuukkala, Mikkeli (eastern Finland), the most common findings were lineages characteristic of ancient European farmer populations. The fifth Iron Age burial site included in the study is located in Levanluhta, western Finland. Many of the individuals buried there represented mtDNA lineages associated with the modern Sami.

“All of the above originally independent lineages remain common in Finland to this day. This indicates that the studied Iron Age populations have had an impact on the gene pool of contemporary Finns,” says doctoral student Sanni Oversti from the Faculty of Biological and Environmental Sciences, University of Helsinki, Finland.

The researchers posit that the differences found in the Iron Age populations of western and eastern Finland are opposite to those found in today’s Finns: the lineages associated with ancient farmers were more common in the east, while the lineages inherited from hunter-gatherers were more prevalent in the west. Farmer populations arriving in Finland not only from the west and south but also from the east provides a potential explanation for this.

###

Media Contact
Paivi Onkamo
[email protected]
358-405-789-189

Original Source

https://www.helsinki.fi/en/news/life-science-news/early-dna-lineages-from-finland-shed-light-on-the-diverse-origins-of-the-contemporary-population

Related Journal Article

http://dx.doi.org/10.1038/s41598-019-51045-8

Tags: ArchaeologyGeneticsHistoryOld WorldPopulation Biology
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