Drosophila CG2469 Encodes a Homolog of Human CTR9 and Is Essential for Development.
Conserved from yeast to humans, the Paf1 complex participates in a number of diverse processes including transcriptional initiation and polyadenylation. This complex typically includes five proteins: Paf1, Rtf1, Cdc73, Leo1, and Ctr9. Previous efforts identified clear Drosophila homologs of Paf1, Rtf1, and Cdc73 based on sequence similarity. Further work showed that these proteins help to regulate gene expression and are required for viability. To date, a Drosophila homolog of Ctr9 has remained uncharacterized. Here, we show that the gene CG2469 encodes a functional Drosophila Ctr9 homolog. Both human and Drosophila Ctr9 localize to the nuclei of Drosophila cells and appear enriched in histone locus bodies. RNAi knockdown of Drosophila Ctr9 results in a germline stem cell loss phenotype marked by defects in the morphology of germ cell nuclei. A molecular null mutation of Drosophila Ctr9 results in lethality and a human cDNA CTR9 transgene rescues this phenotype. Clonal analysis in the ovary using this null allele reveals that loss of Drosophila Ctr9 results in a reduction of global levels of histone H3 trimethylation of lysine 4 (H3K4me3), but does not compromise the maintenance of stem cells in ovaries. Given the differences between the null mutant and RNAi knockdown phenotypes, the germ cell defects caused by RNAi likely result from the combined loss of Drosophila Ctr9 and other unidentified genes. These data provide further evidence that the function of this Paf1 complex component is conserved across species.
Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390.
Dhananjay
0000-0002-3957-1236
D
Chaturvedi
Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390.
Mayu
M
Inaba
Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390.
Shane
S
Scoggin
Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390 michael.buszczak@utsouthwestern.edu.
Michael
M
Buszczak
D000818:Animals; D030801:Animals, Genetically Modified; D004330:Drosophila / Q000196:embryology* / Q000235:genetics*; D029721:Drosophila Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D019143:Evolution, Molecular; D005260:Female; D055786:Gene Knockout Techniques; D020043:Genes, Essential; D056726:Genetic Association Studies; D005854:Germ Cells / Q000378:metabolism; D006801:Humans; D009154:Mutation; D009687:Nuclear Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D010641:Phenotype; D010750:Phosphoproteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D011485:Protein Binding; D034622:RNA Interference; D013234:Stem Cells / Q000378:metabolism; D014157:Transcription Factors
C484387:CTR9 protein, human; D029721:Drosophila Proteins; D009687:Nuclear Proteins; D010750:Phosphoproteins; D014157:Transcription Factors
Ctr9; PAF1 complex; RNAi; chromatin; germline
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