Genetic and karyotype divergence between parents affect clonality and sterility in hybrids

0580500 - ÚŽFG 2024 RIV GB eng J - Journal Article
Marta, Anatolie - Tichopád, Tomáš - Bartoš, O. - Klíma, Jiří - Shah, M. A. - Bohlen Šlechtová, Vendula - Bohlen, Jörg - Halačka, Karel - Choleva, L. - Stöck, M. - Dedukh, Dmitrij - Janko, Karel
Genetic and karyotype divergence between parents affect clonality and sterility in hybrids.
eLife. Roč. 12, Nov 6 (2023), č. článku RP88366. ISSN 2050-084X. E-ISSN 2050-084X
R&D Projects: GA ČR(CZ) GA19-21552S; GA ČR(CZ) GA21-25185S; GA MŠMT EF15_003/0000460
Institutional support: RVO:67985904
Keywords : Cobitis * asexual reproduction * evolutionary biology
OECD category: Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology
Impact factor: 7.7, year: 2022
Method of publishing: Open access
https://elifesciences.org/articles/88366

Asexual reproduction can be triggered by interspecific hybridization, but its emergence is supposedly rare, relying on exceptional combinations of suitable genomes. To examine how genomic and karyotype divergence between parental lineages affect the incidence of asexual gametogenesis, we experimentally hybridized fishes (Cobitidae) across a broad phylogenetic spectrum, assessed by whole exome data. Gametogenic pathways generally followed a continuum from sexual reproduction in hybrids between closely related evolutionary lineages to sterile or inviable crosses between distant lineages. However, most crosses resulted in a combination of sterile males and asexually reproducing females. Their gametes usually experienced problems in chromosome pairing, but females also produced a certain proportion of oocytes with premeiotically duplicated genomes, enabling their development into clonal eggs. Interspecific hybridization may thus commonly affect cell cycles in a specific way, allowing the formation of unreduced oocytes. The emergence of asexual gametogenesis appears tightly linked to hybrid sterility and constitutes an inherent part of the extended speciation continuum.
Permanent Link: https://hdl.handle.net/11104/0349277