期刊
NATURE ECOLOGY & EVOLUTION
卷 2, 期 4, 页码 669-679出版社
NATURE PORTFOLIO
DOI: 10.1038/s41559-018-0473-y
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资金
- NIH [2R24OD011198-04A1, R24OD011120]
- NSF [DBI-1564611]
- German Research Foundation DFG [Scha408/10-1, Scha408/12-1]
- German Science Foundation/DFG [STO 493/2-2]
- MINECO (FEDER) [BFU2014-55090-P]
- Obra Social 'La Caixa'
- Secretaria d'Universitats i Recerca del Departament d'Economia i Coneixement de la Generalitat de Catalunya
- Intramural Research Program of the NIH, National Library of Medicine
- Wellcome Trust [WT108749/Z/15/Z, WT098051]
- National Institutes of Health [R24 RR032658-01]
- European Molecular Biology Laboratory
- Howard Hughes International Early Career
- [U01 MH106874]
The extreme rarity of asexual vertebrates in nature is generally explained by genomic decay due to absence of meiotic recombination, thus leading to extinction of such lineages. We explore features of a vertebrate asexual genome, the Amazon molly, Poecilia formosa, and find few signs of genetic degeneration but unique genetic variability and ongoing evolution. We uncovered a substantial clonal polymorphism and, as a conserved feature from its interspecific hybrid origin, a 10-fold higher heterozygosity than in the sexual parental species. These characteristics seem to be a principal reason for the unpredicted fitness of this asexual vertebrate. Our data suggest that asexual vertebrate lineages are scarce not because they are at a disadvantage, but because the genomic combinations required to bypass meiosis and to make up a functioning hybrid genome are rarely met in nature.
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