Challenges and costs of asexuality: Variation in premeiotic genome duplication in gynogenetic hybrids from cobitis taenia complex
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DEDUKH, Dmitry, MARTA, Anatolie, JANKO, Karel. Challenges and costs of asexuality: Variation in premeiotic genome duplication in gynogenetic hybrids from cobitis taenia complex. In: International Journal of Molecular Sciences, 2021, nr. 22(22), pp. 1-20. ISSN 1661-6596. DOI: https://doi.org/10.3390/ijms222212117
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International Journal of Molecular Sciences
Numărul 22(22) / 2021 / ISSN 1661-6596 /ISSNe 1422-0067

Challenges and costs of asexuality: Variation in premeiotic genome duplication in gynogenetic hybrids from cobitis taenia complex

DOI: https://doi.org/10.3390/ijms222212117

Pag. 1-20

Dedukh Dmitry1, Marta Anatolie123, Janko Karel4
 
1 Institute of Animal Physiology and Genetics, Academy of Sciences of the Czech Republic,
2 Charles University, Prague,
3 Institute of Zoology,
4 University of Ostrava
 
Disponibil în IBN: 14 noiembrie 2021


Rezumat

The transition from sexual reproduction to asexuality is often triggered by hybridization. The gametogenesis of many hybrid asexuals involves premeiotic genome endoreplication leading to bypass hybrid sterility and forming clonal gametes. However, it is still not clear when endoreplication occurs, how many gonial cells it affects and whether its rate differs among clonal lineages. Here, we investigated meiotic and premeiotic cells of diploid and triploid hybrids of spined loaches (Cyprini-formes: Cobitis) that reproduce by gynogenesis. We found that in naturally and experimentally produced F1 hybrids asexuality is achieved by genome endoreplication, which occurs in gonocytes just before entering meiosis or, rarely, one or a few divisions before meiosis. However, genome endoreplication was observed only in a minor fraction of the hybrid’s gonocytes, while the vast majority of gonocytes were unable to duplicate their genomes and consequently could not proceed beyond pachytene due to defects in bivalent formation. We also noted that the rate of endoreplication was significantly higher among gonocytes of hybrids from natural clones than of experimentally produced F1 hybrids. Thus, asexuality and hybrid sterility are intimately related phenomena and the transition from sexual reproduction to asexuality must overcome significant problems with genome incompatibilities with a possible impact on reproductive potential.

Cuvinte-cheie
Cobitis taenia complex, Endoreplication, Gynogenesis, Hybrid sterility, meiosis, Polyploidy