Cell
ArticleDrosophila ribosomal RNA genes function as an X-Y pairing site during male meiosis
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Under the magnifying glass: The ups and downs of rDNA copy number
2023, Seminars in Cell and Developmental BiologyCitation Excerpt :First, Y chromosomes are subject to hyperploidy through spontaneous (primary) nondisjunction of either sex chromosome in males or females [44,7]. Importantly, nondisjunction may be more likely in males with chromosomes bearing bobbed alleles [62] and the lack of genetic markers on the Y makes its presence essentially invisible. Since the bobbed phenotype is dependent on the sum of rDNA copy number, even Y-bb chromosomes can complement a bobbed genotype in X-bb/X-bb/Y-bb females and X-bb/Y-bb/Y-bb males (compared to, respectively, X-bb/X-bb and X-bb/Y-bb).
Chromosome-specific behaviors during early meiosis
2023, Current Topics in Developmental BiologyCitation Excerpt :The rDNA localizes to the nucleolus, thereby bringing the rDNA segments on both X chromosomes in close proximity. Therefore, it has been speculated that the rDNA may function as a pairing site as it does in D. melanogaster male meiosis (reviewed by McKee & Karpen, 1990; Tsai & McKee, 2011). This hypothesis is supported by the observation that autosomes require localization of SC proteins to the centromere for centromeric pairing, while X chromosome centromeric pairing is independent of SC proteins (Christophorou et al., 2013; Joyce et al., 2013).
Uncharted territories: Solving the mysteries of male meiosis in flies
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