Human inbreeding has decreased in time through the Holocene

Ceballos, Francisco C.
Gürün, Kanat
Altınışık, Nefize Ezgi
Gemici, Hasan Can
Karamurat, Cansu
Koptekin, Dilek
Vural, Kıvılcım Başak
Mapelli, Igor
Sağlıcan, Ekin
Sürer, Elif
Erdal, Yılmaz Selim
Götherström, Anders
Özer, Füsun
Atakuman, Çiğdem
Somel, Mehmet
The history of human inbreeding is controversial.1 In particular, how the development of sedentary and/or agricultural societies may have influenced overall inbreeding levels, relative to those of hunter-gatherer communities, is unclear.2–5 Here, we present an approach for reliable estimation of runs of homozygosity (ROHs) in genomes with R33 mean sequence coverage across >1 million SNPs and apply this to 411 ancient Eurasian genomes from the last 15,000 years.5–34 We show that the frequency of inbreeding, as measured by ROHs, has decreased over time. The strongest effect is associated with the Neolithic transition, but the trend has since continued, indicating a population size effect on inbreeding prevalence. We further show that most inbreeding in our historical sample can be attributed to small population size instead of consanguinity. Cases of high consanguinity were rare and only observed among members of farming societies in our sample. Despite the lack of evidence for common consanguinity in our ancient sample, consanguineous traditions are today prevalent in various modern-day Eurasian societies,1,35–37 suggesting that such practices may have become widespread within the last few millennia.
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Citation Formats
F. C. Ceballos et al., “Human inbreeding has decreased in time through the Holocene,” Current Biology, pp. 3925–3934, 2021, Accessed: 00, 2021. [Online]. Available: