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The African clawed frog Xenopus laevis (Pipidae, Anura, Amphibia) is a model object of cell and evolutionary biology. X. laevis is a paleotetraploid frog. For the first time, the results of an immunocytological analysis of the Xenopus chromosome behaviour in the meiotic prophase I based on synaptonemal complexes (SC) are presented. We identified all stages of meiosis prophase I, and determined the dynamics of the main proteins involved in the synapsis and repair of DNA DSBs. We did not find a homeologous synapsis.
This is a preprint submission to PeerJ
Xenopus laevis spermatocytes at different stages of prophase I. a. Zygotene stage. Chromosome bouquet; b. Pachytene stage; c. Diplotene. White signal corresponds to the distribution of the major protein of SC - SYCP3. Magnification × 1000.
Representation of chromosome synapsis in Xenopus. Chromosome telomeres are grouped near one of the nucleus poles at the zygotene (“bouquet” stage). In pachytene, SCs are formes by homologs. Homeologous synapsis is absent.