Abstract
Premeiotic and meiotic chromosome distribution was studied in rat testes suspensions by a triple-color fluorescent staining protocol which allows simultaneous visual inspection of two chromosomal targets highlighted by FISH together with immunostained SCP3 synaptonemal complex (SC) proteins which are marked by a third, composite color. Triple labeling with rat chromosome (RNO) 4q and 19p specific probes and SCP3 staining disclosed that homologs are separated in premeiotic and leptotene nuclei. Pairing of homologous chromosome regions commenced during early zygotene, with pairing of the small metacentric chromosomes 19 preceding that of the distal region of the long arm of RNO4. Our results show that homolog association occurs during zygotene of rat spermatogenesis, with small and large chromosomes showing a considerable asynchrony. Comparison with pairing progression in meiosis of other mammals suggests that asynchronous chromosome pairing reflects size differences within a complement.
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Scherthan, H., Schönborn, I. Asynchronous chromosome pairing in male meiosis of the rat (Rattus norvegicus). Chromosome Res 9, 273–282 (2001). https://doi.org/10.1023/A:1016642528981
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DOI: https://doi.org/10.1023/A:1016642528981