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Population resequencing of European mitochondrial genomes highlights sex-bias in Bronze Age demographic expansions. | LitMetric

AI Article Synopsis

  • Increasing ancient and modern DNA evidence is reshaping interpretations of European prehistory, especially regarding male lineage expansions during the Bronze Age.
  • Contrasting findings from Y-chromosome studies and mitochondrial DNA studies highlight a lack of Bronze Age expansion, with more evidence pointing to Paleolithic expansions instead.
  • This research emphasizes the difference in demographic transitions based on sex, revealing that recent population changes in Europe were not equally distributed between males and females.

Article Abstract

Interpretations of genetic data concerning the prehistory of Europe have long been a subject of great debate, but increasing amounts of ancient and modern DNA data are now providing new and more informative evidence. Y-chromosome resequencing studies in Europe have highlighted the prevalence of recent expansions of male lineages, and focused interest on the Bronze Age as a period of cultural and demographic change. These findings contrast with phylogeographic studies based on mitochondrial DNA (mtDNA), which have been interpreted as supporting expansions from glacial refugia. Here we have undertaken a population-based resequencing of complete mitochondrial genomes in Europe and the Middle East, in 340 samples from 17 populations for which Y-chromosome sequence data are also available. Demographic reconstructions show no signal of Bronze Age expansion, but evidence of Paleolithic expansions in all populations except the Saami, and with an absence of detectable geographical pattern. In agreement with previous inference from modern and ancient DNA data, the unbiased comparison between the mtDNA and Y-chromosome population datasets emphasizes the sex-biased nature of recent demographic transitions in Europe.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5608872PMC
http://dx.doi.org/10.1038/s41598-017-11307-9DOI Listing

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