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• W1564384589 endingPage "e0128114" @default.
• W1564384589 startingPage "e0128114" @default.
• W1564384589 abstract "The eukaryotic genome is assembled into distinct types of chromatin. Gene-rich euchromatin has active chromatin marks, while heterochromatin is gene-poor and enriched for silencing marks. In spite of this, genes native to heterochromatic regions are dependent on their normal environment for full expression. Expression of genes in autosomal heterochromatin is reduced in male flies mutated for the noncoding roX RNAs, but not in females. roX mutations also disrupt silencing of reporter genes in male, but not female, heterochromatin, revealing a sex difference in heterochromatin. We adopted a genetic approach to determine how this difference is regulated, and found no evidence that known X chromosome counting elements, or the sex determination pathway that these control, are involved. This suggested that the sex chromosome karyotype regulates autosomal heterochromatin by a different mechanism. To address this, candidate genes that regulate chromosome organization were examined. In XX flies mutation of Topoisomerase II (Top2), a gene involved in chromatin organization and homolog pairing, made heterochromatic silencing dependent on roX, and thus male-like. Interestingly, Top2 also binds to a large block of pericentromeric satellite repeats (359 bp repeats) that are unique to the X chromosome. Deletion of X heterochromatin also makes autosomal heterochromatin in XX flies dependent on roX and enhances the effect of Top2 mutations, suggesting a combinatorial action. We postulate that Top2 and X heterochromatin in Drosophila comprise a novel karyotype-sensing pathway that determines the sensitivity of autosomal heterochromatin to loss of roX RNA." @default.
• W1564384589 created "2016-06-24" @default.
• W1564384589 creator A5007641760 @default.
• W1564384589 creator A5008118643 @default.
• W1564384589 date "2015-06-08" @default.
• W1564384589 modified "2023-09-24" @default.
• W1564384589 title "Sex Differences in Drosophila melanogaster Heterochromatin Are Regulated by Non-Sex Specific Factors" @default.
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• W1564384589 doi "https://doi.org/10.1371/journal.pone.0128114" @default.
• W1564384589 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4459879" @default.
• W1564384589 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26053165" @default.
• W1564384589 hasPublicationYear "2015" @default.
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