We describe the behaviour of synaptonemal complexes (SCs) in Syrian hamster and mouse oocytes. In Mesocricetus auratus, synaptonemal complexes can be observed from birth up to 7 days of life. In foetuses from Mus musculus, synaptonemal complexes can be observed from the 14th day of gestation up to the first day post-partum, when the cells enter the dictyotene stage. In both species, synaptonemal complexes show, in general, the same morphology described in male cells by light and electron microscopy, with the exception that the axes of the sex bivalent are not identifiable. The leptotene stage can be identified although it is probably of short duration. Only one type of zygotene (zygote ne II of Dietrich and Mulder(Chromosoma 88: 377), 1983) has been observed. In the hamster we also describe a desynaptic diplotene stage previous to the desintegration of the SCs. In oocytes from both species late pairing (or precocious separation) of a single bivalent can be seen in a few cells. Interlocking of some bivalents with delayed pairing of the affected region is rather frequent. Furthermore, hamster oocytes may show heterosynapsis of the telomeres of autosomal bivalents by pachytene. © 1985 Dr W. Junk Publishers.
|Translated title of the contribution||Sequential study of synaptonemal complex in Syrian hamster (Mesocricetus auratus) and mice (mus musculus) oocytes by light and electron microscopy|
|Original language||Multiple languages|
|Publication status||Published - 1 Aug 1985|
Freixa, L., Garcia, M., Ponsà, M., Navarro, J., & Egozcue, J. (1985). Sequential study of synaptonemal complex in Syrian hamster (Mesocricetus auratus) and mice (mus musculus) oocytes by light and electron microscopy. Genetica, 67(2), 87-97. https://doi.org/10.1007/BF02424415