Targeting of painting of fourth to roX1 and roX2 proximal sites suggests evolutionary links between dosage compensation and the regulation of the 4th chromosome in Drosophila melanogaster
2013 (English)In: G3: Genes, Genomes, Genetics, ISSN 2160-1836, Vol. 3, no 8, 1325-1334 p.Article in journal (Refereed) Published
In Drosophila melanogaster, two chromosome-specific targeting and regulatory systems have been described. The male-specific lethal (MSL) complex supports dosage compensation by stimulating gene expression from the male X-chromosome and the protein Painting of fourth (POF) specifically targets and stimulates expression from the heterochromatic 4(th) chromosome. The targeting sites of both systems are well characterized, but the principles underlying the targeting mechanisms have remained elusive. Here we present an original observation, namely that POF specifically targets two loci on the X-chromosome, PoX1 and PoX2 (POF-on-X). PoX1 and PoX2 are located close to the roX1 and roX2 genes, which encode ncRNAs important for the correct targeting and spreading of the MSL-complex. We also found that the targeting of POF to PoX1 and PoX2 is largely dependent on roX expression and identified a high-affinity target region which ectopically recruits POF. The results presented support a model linking the MSL-complex to POF and dosage compensation to regulation of heterochromatin.
Place, publisher, year, edition, pages
2013. Vol. 3, no 8, 1325-1334 p.
Painting of fourth, dosage compensation, heterochromatin, epigenetics, Drosophila melanogaster
Research subject Genetics
IdentifiersURN: urn:nbn:se:umu:diva-72725DOI: 10.1534/g3.113.006866PubMedID: 23733888OAI: oai:DiVA.org:umu-72725DiVA: diva2:626996