Schiffer, PH;
Danchin, EGJ;
Burnell, AM;
Creevey, CJ;
Wong, S;
Dix, I;
O'Mahony, G;
... Blaxter, M; + view all
(2019)
Signatures of the Evolution of Parthenogenesis and Cryptobiosis in the Genomes of Panagrolaimid Nematodes.
iScience
, 21
pp. 587-602.
10.1016/j.isci.2019.10.039.
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Abstract
Most animal species reproduce sexually and fully parthenogenetic lineages are usually short lived in evolution. Still, parthenogenesis may be advantageous as it avoids the cost of sex and permits colonization by single individuals. Panagrolaimid nematodes have colonized environments ranging from arid deserts to Arctic and Antarctic biomes. Many are obligatory meiotic parthenogens, and most have cryptobiotic abilities, being able to survive repeated cycles of complete desiccation and freezing. To identify systems that may contribute to these striking abilities, we sequenced and compared the genomes and transcriptomes of parthenogenetic and outcrossing panagrolaimid species, including cryptobionts and non-cryptobionts. The parthenogens are triploids, most likely originating through hybridization. Adaptation to cryptobiosis shaped the genomes of panagrolaimid nematodes and is associated with the expansion of gene families and signatures of selection on genes involved in cryptobiosis. All panagrolaimids have acquired genes through horizontal gene transfer, some of which are likely to contribute to cryptobiosis.
| Type: | Article |
|---|---|
| Title: | Signatures of the Evolution of Parthenogenesis and Cryptobiosis in the Genomes of Panagrolaimid Nematodes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.isci.2019.10.039 |
| Language: | English |
| Additional information: | © 2019 The Authors. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Evolutionary Biology, Phylogenetics, Transcriptomics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Education UCL > Provost and Vice Provost Offices > School of Education > UCL Institute of Education UCL > Provost and Vice Provost Offices > School of Education > UCL Institute of Education > IOE - Psychology and Human Development |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10086607 |
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