Project description:RPA12 is a subunit of RNA polymerase I. We used microarrays to know the effect RPA12 deltion in lipid metabolism and identified distinct classes of up-regulated genes during this process.
Project description:mRNA Seq analysis of Drosophila wing imaginal discs from Rp mutants and controls in the presence and absence of RpS12 mutations RpS12 is a regulatory gene required for Xrp1-mediated control of translation and growth in mutants for other ribosomal protein genes Loss of function mutations in Ribosomal Protein (Rp) genes are generally lethal, but heterozygous mutant phenotypes increasingly reveal previously cryptic functions of Rps in growth control and tumor suppression. Here we report that RpS12 in particular is a regulatory gene that controls its own expression levels and also signals to control hundreds of gene expression changes in mutants for haploinsufficient Rp genes, acting through the bZip protein Xrp1. Through Xrp1, RpS12 reduces the bulk translation rate of Rp mutant cells and increases the developmental rate of Rp mutant genotypes. RpS12 also has an Xrp1-independent, positive contribution to normal development, so that the effects of RpS12 mutations in different genetic backgrounds reflects the sum of the Xrp1-dependent and Xrp1-independent effects. Our findings outline a regulatory response to mutations affecting essential Rp genes that controls overall translation and growth.
