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Clonal gametogenesis is triggered by intrinsic stimuli in the hybrid's germ cells but is dependent on sex differentiation(dagger)
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SYSNO ASEP 0563618 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Clonal gametogenesis is triggered by intrinsic stimuli in the hybrid's germ cells but is dependent on sex differentiation(dagger) Author(s) Tichopád, T. (CZ)
Franěk, R. (CZ)
Doležálková-Kaštánková, Marie (UZFG-Y) ORCID
Didukh, Dmitrij (UZFG-Y) ORCID
Marta, Anatolie (UZFG-Y) ORCID
Halačka, Karel (UZFG-Y)
Steinbach, C. (CZ)
Janko, Karel (UZFG-Y) RID, ORCID
Pšenička, M. (CZ)Source Title Biology of Reproduction. - : Oxford University Press - ISSN 0006-3363
Roč. 107, č. 2 (2022), s. 446-457Number of pages 12 s. Publication form Online - E Language eng - English Country US - United States Keywords asexuality ; hybridization ; gonial stem cell transplantation Subject RIV EB - Genetics ; Molecular Biology OECD category Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology R&D Projects GA17-09807S GA ČR - Czech Science Foundation (CSF) GA19-21552S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UZFG-Y - RVO:67985904 UT WOS 000786678100001 EID SCOPUS 85136909118 DOI 10.1093/biolre/ioac074 Annotation Interspecific hybridization may trigger the transition from sexual reproduction to asexuality, but mechanistic reasons for such a change in a hybrid's reproduction are poorly understood. Gametogenesis of many asexual hybrids involves a stage of premeiotic endoreplication (PMER), when gonial cells duplicate chromosomes and subsequent meiotic divisions involve bivalents between identical copies, leading to production of clonal gametes. Here, we investigated the triggers of PMER and whether its induction is linked to intrinsic stimuli within a hybrid's gonial cells or whether it is regulated by the surrounding gonadal tissue. We investigated gametogenesis in the Cobitis taenia hybrid complex, which involves sexually reproducing species (Cobitis elongatoides and C. taenia) as well as their hybrids, where females reproduce clonally via PMER while males are sterile. We transplanted spermatogonial stem cells (SSCs) from C. elongatoides and triploid hybrid males into embryos of sexual species and of asexual hybrid females, respectively, and observed their development in an allospecific gonadal environment. Sexual SSCs underwent regular meiosis and produced normally reduced gametes when transplanted into clonal females. On the other hand, the hybrid's SSCs lead to sterility when transplanted into sexual males but maintained their ability to undergo asexual development (PMER) and production of clonal eggs, when transplanted into sexual females. This suggests that asexual gametogenesis is under complex control when somatic gonadal tissue indirectly affects the execution of asexual development by determining the sexual differentiation of stem cells and once such cells develop to female phenotypes, hybrid germ cells trigger the PMER from their intrinsic signals.
Although sexual reproduction is a dominant trait among all eukaryotes, many taxa have evolved the ability to reproduce asexually. While asexuality often appears to be linked to interspecific hybridization, it remains unknown how the coexistence of diverged genomes may initiate such a swap in reproduction. In our study, we transplanted germ cells between asexual hybrids and their parents. On the one hand, the ability of clonal gametogenesis occurred exclusively in hybrid germ cells, suggesting that asexual development is directly triggered by the hybrid genomic constitution of the cell. On the other hand, clonality was observed only in cells transplanted into females, suggesting that the execution of clonal development is influenced by signals from the gonadal environment and regulated by somatic factors.Workplace Institute of Animal Physiology and Genetics Contact Jana Zásmětová, knihovna@iapg.cas.cz, Tel.: 315 639 554 Year of Publishing 2023 Electronic address https://academic.oup.com/biolreprod/article/107/2/446/6567957?login=true
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