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• W2912084193 abstract "Abstract In most eukaryotes, centromeric histone (CenH3) proteins mediate the highly conserved process of chromosome segregation as the foundational kinetochore assembly factor. However, in multicellular organisms, CenH3 proteins have to perform their essential functions in different chromatin environments. CenH3 proteins not only mediate mitosis and meiosis but also ensure epigenetic inheritance of centromere identity on sperm chromatin, which is highly compact and almost completely stripped of histones during spermiogenesis. We hypothesized that such disparate chromatin environments might impose different functional constraints on CenH3. If so, gene duplications could ameliorate the difficulty of encoding divergent and even potentially incompatible centromeric functions in the same gene. Here, we analyzed the cytological localization of two recently identified CenH3 paralogs, Cid1 and Cid5, in D. virilis using specific antibodies and epitope-tagged transgenic strains. We find that only ancestral Cid1 is present in somatic cells, whereas both Cid1 and Cid5 are expressed in testes and ovaries. However, Cid1 and Cid5 are alternately retained in male and female gametes; Cid1 is lost in male meiosis but retained throughout oogenesis, whereas Cid5 is lost during female meiosis but retained in mature sperm. Following fertilization, maternally deposited Cid1 rapidly replaces paternal Cid5 during the protamine-to-histone transition. Our studies reveal mutually exclusive gametic specialization of two divergent CenH3 paralogs. We suggest that centromeric histone duplication and divergence may allow essential genes involved in chromosome segregation to specialize and thereby resolve an intralocus conflict between maternal and paternal centromeric histone requirements in many animal species." @default.
• W2912084193 created "2019-02-21" @default.
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• W2912084193 date "2019-01-25" @default.
• W2912084193 modified "2023-10-16" @default.
• W2912084193 title "Gametic specialization of centromeric histone paralogs in<i>Drosophila virilis</i>" @default.
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• W2912084193 doi "https://doi.org/10.1101/530295" @default.
• W2912084193 hasPublicationYear "2019" @default.
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