ArticleChromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology2022
Achiasmatic meiosis in the unisexual Amazon molly, Poecilia formosa.
Article in Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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15 citing papers in PubMed, 32 citations in OpenAlex.
- Ancestral gene flow shaped the singular origin of the Amazon molly.bioRxiv : the preprint server for biology · 2026Article
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- The DNA mismatch repair protein Msh4 is essential for meiosis of male but not for female in zebrafish.Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology · 2026Article
- Evolution, Development, and the Incoherence of Sex: A Framework for Multiple Sex Concepts.Integrative and comparative biology · 2026Article
- The Tree of Sex consortium: a global initiative for studying the evolution of reproduction in eukaryotes.Journal of evolutionary biology · 2025Article
- Converging or diverging? Shape coevolution between a sperm-dependent asexual and its sexual hosts.Proceedings. Biological sciences · 2025Article
- The retinoic acid family-like nuclear receptor SmRAR identified by single-cell transcriptomics of ovarian cells controls oocyte differentiation in Schistosoma mansoni.Nucleic acids research · 2025Article
- Lampbrush chromosomes of Danio rerio.Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology · 2025Article
- Reproduction-associated pathways in females of gibel carp (Carassius gibelio) shed light on the molecular mechanisms of the coexistence of asexual and sexual reproduction.BMC genomics · 2024Article
- A cyclical switch of gametogenic pathways in hybrids depends on the ploidy level.Communications biology · 2024Article
- Meiotic deviations and endoreplication lead to diploid oocytes in female hybrids between bighead catfish (Frontiers in cell and developmental biology · 2024Article
- Validity of Xiphophorus fish as models for human disease.Disease models & mechanisms · 2024Review
- Enrichment effects on growth, health, and reproduction in a single clone of the asexual Amazon molly,PeerJ · 2024Article
- Genetic and karyotype divergence between parents affect clonality and sterility in hybrids.eLife · 2023Article
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Authors and funding
10 authors at 5 institutions in 4 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Unisexual reproduction, which generates clonal offspring, is an alternative strategy to sexual breeding and occurs even in vertebrates. A wide range of non-sexual reproductive modes have been described, and one of the least understood questions is how such pathways emerged and how they mechanistically proceed. The Amazon molly, Poecilia formosa, needs sperm from males of related species to trigger the parthenogenetic development of diploid eggs. However, the mechanism, of how the unreduced female gametes are produced, remains unclear. Cytological analyses revealed that the chromosomes of primary oocytes initiate pachytene but do not proceed to bivalent formation and meiotic crossovers. Comparing ovary transcriptomes of P. formosa and its sexual parental species revealed expression levels of meiosis-specific genes deviating from P. mexicana but not from P. latipinna. Furthermore, several meiosis genes show biased expression towards one of the two alleles from the parental genomes. We infer from our data that in the Amazon molly diploid oocytes are generated by apomixis due to a failure in the synapsis of homologous chromosomes. The fact that this failure is not reflected in the differential expression of known meiosis genes suggests the underlying molecular mechanism may be dysregulation on the protein level or misexpression of a so far unknown meiosis gene, and/or hybrid dysgenesis because of compromised interaction of proteins from diverged genomes.
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