Incorporation of subgenomic amounts of DNA as compensation for mutational load in a gynogenetic fish

A CENTRAL paradigm in evolutionary biology is that sexual reproduction is advantageous over asexuality 1–5 . One of the long-term disadvantages asexual forms have to face is Muller's ratchet 6 . In the absence of recombination, theoretically no genotype can ever produce offspring with fewer mut...

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Bibliographic Details
Published in:Nature (London) 1995-01, Vol.373 (6509), p.68-71
Main Authors: Schartl, Manfred, Nanda, Indrajit, Schlupp, Ingo, Wilde, Brigitta, Epplen, Jörg T, Schmid, Michael, Parzefall, Jakob
Format: Article
Language:English
Subjects:
Animal reproduction
Animals
Biological and medical sciences
Bisexuality
Classical genetics, quantitative genetics, hybrids
Deoxyribonucleic acid
DNA
Fish
Freshwater
Fundamental and applied biological sciences. Psychology
Genetics
Genetics of eukaryotes. Biological and molecular evolution
Humanities and Social Sciences
letter
multidisciplinary
Mutation
Poecilia formosa
Science
Science (multidisciplinary)
Vertebrata
Zoology
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Summary:A CENTRAL paradigm in evolutionary biology is that sexual reproduction is advantageous over asexuality 1–5 . One of the long-term disadvantages asexual forms have to face is Muller's ratchet 6 . In the absence of recombination, theoretically no genotype can ever produce offspring with fewer mutations than its own load. The accumulation of deleterious mutations and gene combinations that cannot be purged should lead to extinction of parthenogenetic forms within 10 4 –10 5 generations 7,8 . Evidence is accumulating, however, that some of these might have survived for such periods or even longer 9–14 . In the Amazon Molly fish Poecilia Formosa we have detected a process that appears to compensate for disadvantages of asexuality, namely incorporation of subgenomic amounts of DNA from a bisexual host species by microchromosomes.
ISSN:0028-0836
1476-4687
DOI:10.1038/373068a0