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- W2742476997 abstract "In the males of Coleoptera, the most frequent sex chromosome constitution is XY. At metaphase I of meiosis, the X and Y are linked by nucleolar proteins, forming the so-called parachute bivalent (Xy<sub>p</sub>), which is assumed to allow the non-synapsed X and Y to segregate correctly at anaphase I. However, X0 males are not exceptional, and we explored the relationships between the X and nucleolar proteins in the absence of the Y chromosome in 6 species belonging to different families/subfamilies. Using C-banding and silver staining, we show that nucleolar proteins always remain in contact with the X until anaphase I. These proteins are generally more abundant than in the Xy<sub>p</sub> bivalent, may remain associated with the NOR during diakinesis, and frequently link the X to 1 or 2 autosomal bivalents, which seem to play the same role as the Y. This role may also be played by B chromosomes, which appear to be more frequent in X0 than in XY males. In conclusion, following Y chromosome loss, various strategies using nucleolar proteins have been developed to facilitate the migration of the unique X at meiotic anaphase I." @default.
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- W2742476997 date "2017-01-01" @default.
- W2742476997 modified "2023-09-25" @default.
- W2742476997 title "Evolution of the Sex Chromosomes in Beetles. I. The Loss of the Y Chromosome" @default.
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- W2742476997 doi "https://doi.org/10.1159/000478075" @default.
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