Uncovering Cryptic Asexuality in Daphnia magna by RAD Sequencing

Genetics
Nils SvendsenChristoph R Haag

Abstract

The breeding systems of many organisms are cryptic and difficult to investigate with observational data, yet they have profound effects on a species' ecology, evolution, and genome organization. Genomic approaches offer a novel, indirect way to investigate breeding systems, specifically by studying the transmission of genetic information from parents to offspring. Here we exemplify this method through an assessment of self-fertilization vs. automictic parthenogenesis in Daphnia magna. Self-fertilization reduces heterozygosity by 50% compared to the parents, but under automixis, whereby two haploid products from a single meiosis fuse, the expected heterozygosity reduction depends on whether the two meiotic products are separated during meiosis I or II (i.e., central vs. terminal fusion). Reviewing the existing literature and incorporating recombination interference, we derive an interchromosomal and an intrachromosomal prediction of how to distinguish various forms of automixis from self-fertilization using offspring heterozygosity data. We then test these predictions using RAD-sequencing data on presumed automictic diapause offspring of so-called nonmale producing strains and compare them with "self-fertilized" offspring produc...Continue Reading

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Sep 12, 2015·Journal of Evolutionary Biology·O NouguéT Lenormand
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Apr 20, 2021·Evolution Letters·Loreleï BoyerThomas Lenormand
Oct 1, 2021·Journal of Evolutionary Biology·Yan R GalimovAndrey V Tchabovsky

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