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Regional differences among the Finns: a Y-chromosomal perspective
Tuuli Lappalainen1, Satu Koivumäki, Elina Salmela
1Finnish Genome Center, University of Helsinki, Finland. tuuli.lappalainen@helsinki.fi
Gene
|April 29, 2006
Summary
Genetic analysis of Finnish males reveals a distinct genetic border between eastern and western populations. Y-chromosomal markers show differing population histories, challenging previous assumptions of Finnish homogeneity.
Area of Science:
- Population Genetics
- Human Evolutionary Studies
- Forensic Genetics
Background:
- Finland's isolated geographic position has historically led to assumptions of a homogeneous population.
- Previous studies hinted at genetic substructure, but comprehensive Y-chromosomal analysis was lacking.
Purpose of the Study:
- To investigate regional genetic variation within Finland using Y-chromosomal markers.
- To elucidate the population history and migration patterns of the Finnish people.
Main Methods:
- Analysis of 22 Y-chromosomal markers (14 biallelic, 8 STRs) in 536 unrelated Finnish males.
- Comparison of genetic data from eastern and western Finnish subpopulations.
- Construction of haplogroup and haplotype networks to visualize genetic relationships.
Main Results:
- A sharp genetic border was identified between eastern and western Finnish subpopulations.
- Both biallelic haplogroup and STR haplotype analyses revealed bifurcated network structures.
- Genetic clustering in frequencies and distances supported distinct population histories for eastern and western Finland.
Conclusions:
- The findings support a model of partly different population histories in western and eastern Finland.
- Early Finno-Ugric migrations likely influenced the entire country, while Scandinavian migrations primarily impacted the west.
- Y-chromosomal data are crucial for uncovering population substructure often missed by mitochondrial DNA analysis.
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