Selfing is the safest sex for Caenorhabditis tropicalis.

Abstract:

:Mating systems have profound effects on genetic diversity and compatibility. The convergent evolution of self-fertilization in three Caenorhabditis species provides a powerful lens to examine causes and consequences of mating system transitions. Among the selfers, Caenorhabditis tropicalis is the least genetically diverse and most afflicted by outbreeding depression. We generated a chromosomal-scale genome for C. tropicalis and surveyed global diversity. Population structure is very strong, and islands of extreme divergence punctuate a genomic background that is highly homogeneous around the globe. Outbreeding depression in the laboratory is caused largely by multiple Medea-like elements, genetically consistent with maternal toxin/zygotic antidote systems. Loci with Medea activity harbor novel and duplicated genes, and their activity is modified by mito-nuclear background. Segregating Medea elements dramatically reduce fitness, and simulations show that selfing limits their spread. Frequent selfing in C. tropicalis may therefore be a strategy to avoid Medea-mediated outbreeding depression.

journal_name

Elife

journal_title

eLife

authors

Noble LM,Yuen J,Stevens L,Moya N,Persaud R,Moscatelli M,Jackson JL,Zhang G,Chitrakar R,Baugh LR,Braendle C,Andersen EC,Seidel HS,Rockman MV

doi

10.7554/eLife.62587

subject

Has Abstract

pub_date

2021-01-11 00:00:00

issn

2050-084X

pii

62587

journal_volume

10

pub_type

杂志文章

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