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- W2082947503 abstract "Nuclear division and chromosome cycle of microsporidia are reviewed in the light of recent speculation that the group diverged as an early branch in the eukaryotic line of descent. Microsporidia are primitive eukaryotis with simple cytoplasmic organisation, lacking mitochondria, peroxisomes and a classical Golgi apparatus. The ribosomes resemble prokaryotic ribosomes in size and in having sequences complementary to the eukaryotic 5.88 rRNA contained within their large (28S) ribosomal subunit, rather than a separate 5.8S molecule. Nuclei may be isolated or closely appressed as a diplokaryotic pair which divide synchronously. Mitosis is intranuclear: there are no centrioles but spindle termini are electron dense plaques in pores in the nuclear envelope. Some genera have isolated nuclei throughout the life cycle, while others have diplokaryotic nuclei throughout: meiosis is not known in either of these categories of genera. In contrast, certain polymorphic species, which are transmitted horizontally between copepods and mosquitoes and vertically between generations of mosquitoes, alternate between stages with isolated nuclei and stages with diplokaryotic nuclei. Haploid spores in copepods are infective to mosquito larvae, in which gametogenesis and plasmogamy occur to give diplokaryotic (diploid) stages. Stages remain diplokaryotic through transovarial transmission to the next generation, when an unusual form of meiosis is initiated in both nuclei of the diplokaryon (as indicated by synaptonemal complexes), and mingling of chromosomes occurs when the two nuclei fuse during pachytene." @default.
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- W2082947503 date "1988-01-01" @default.
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- W2082947503 title "Nuclear division and chromosome cycle in microsporidia" @default.
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- W2082947503 doi "https://doi.org/10.1016/0303-2647(88)90030-5" @default.
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