Precocious formation of synaptonemal-like polycomplexes and their subsequent fate in female Ascaris lumbricoides var. suum |
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Authors: | Annelise Fiil Paul Goldstein Peter B. Moens |
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Affiliation: | (1) University Institute of Medical Genetics, Tagensvej 14, 2200 Copenhagen, Denmark;(2) Department of Biology, York University, M3J 1P3 Downsview, Ontario, Canada;(3) Present address: Department of Genetics, North Carolina State University, 27607 Raleigh, North Carolina, USA |
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Abstract: | During meiotic interphase, before leptotene, synaptonemal-like polycomplexes are seen in the cytoplasm of the Ascaris lumbricoides oocytes and in the communal anucleate rachis. In some females short intranuclear synaptonemal complexes are present briefly at that early stage. The number of extranuclear complexes increases just before leptotene, some are attached to the pores of the nuclear membrane. During zygotene most polycomplexes disappear. At late pachytene they reappear in some females but not in others. The morphology, when first seen, is that of disorganized filamentous bodies, later lateral elements appear among the filaments. The dimensions of the lateral elements of the polycomplexes are variable. In the male the distribution of polycomplexes among the rachis, the cell cytoplasm, and at the nuclear envelope is similar to that observed in the female.These observations confirm the precocious occurrence of synaptonemal-like polycomplexes reported by Bogdanov (1977). Ascaris lumbricoides thus, uniquely, appears to manufacture synaptonemal complex-like material in the communal cytoplasm of the germ cells prior to the time that the full complement of synaptonemal complexes appears in the nucleus. |
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