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  • Mahadevaraju, Sharvani, et al. (författare)
  • Dynamic sex chromosome expression in Drosophila male germ cells
  • 2021
  • Ingår i: Nature Communications. - : Springer Nature. - 2041-1723. ; 12
  • Tidskriftsartikel (refereegranskat)abstract
    • Given their copy number differences and unique modes of inheritance, the evolved gene content and expression of sex chromosomes is unusual. In many organisms the X and Y chromosomes are inactivated in spermatocytes, possibly as a defense mechanism against insertions into unpaired chromatin. In addition to current sex chromosomes, Drosophila has a small gene-poor X-chromosome relic (4(th)) that re-acquired autosomal status. Here we use single cell RNA-Seq on fly larvae to demonstrate that the single X and pair of 4(th) chromosomes are specifically inactivated in primary spermatocytes, based on measuring all genes or a set of broadly expressed genes in testis we identified. In contrast, genes on the single Y chromosome become maximally active in primary spermatocytes. Reduced X transcript levels are due to failed activation of RNA-Polymerase-II by phosphorylation of Serine 2 and 5. Sex chromosome gene content and expression is unusual. Here the authors use single cell RNA-Seq on Drosophila larvae to demonstrate that the single X and pair of 4th chromosomes are specifically inactivated in primary spermatocytes, while genes on the single Y chromosome become maximally active in primary spermatocytes.
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