Associations of autozygosity with a broad range of human phenotypes

Publication date

2019-12-01

Authors

Clark, David W
Okada, Yukinori
Moore, Kristjan H S
Mason, Dan
Pirastu, Nicola
Gandin, Ilaria
Mattsson, Hannele
Barnes, Catriona L K
Lin, Kuang
Zhao, Jing Hua

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Article

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Abstract

In many species, the offspring of related parents suffer reduced reproductive success, a phenomenon known as inbreeding depression. In humans, the importance of this effect has remained unclear, partly because reproduction between close relatives is both rare and frequently associated with confounding social factors. Here, using genomic inbreeding coefficients (F ROH) for >1.4 million individuals, we show that F ROH is significantly associated (p < 0.0005) with apparently deleterious changes in 32 out of 100 traits analysed. These changes are associated with runs of homozygosity (ROH), but not with common variant homozygosity, suggesting that genetic variants associated with inbreeding depression are predominantly rare. The effect on fertility is striking: F ROH equivalent to the offspring of first cousins is associated with a 55% decrease [95% CI 44–66%] in the odds of having children. Finally, the effects of F ROH are confirmed within full-sibling pairs, where the variation in F ROH is independent of all environmental confounding.

Keywords

General Physics and Astronomy, General Chemistry, General Biochemistry,Genetics and Molecular Biology, Journal Article

Citation

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