Novel transcription regulatory elements in Caenorhabditis elegans muscle genes.
We report the identification of three new transcription regulatory elements that are associated with muscle gene expression in the nematode Caenorhabditis elegans. Starting from a subset of well-characterized nematode muscle genes, we identified conserved DNA motifs in the promoter regions using computational DNA pattern-recognition algorithms. These were considered to be putative muscle transcription regulatory motifs. Using the green-fluorescent protein (GFP) as a reporter, experiments were done to determine the biological activity of these motifs in driving muscle gene expression. Prediction accuracy of muscle expression based on the presence of these three motifs was encouraging; nine of 10 previously uncharacterized genes that were predicted to have muscle expression were shown to be expressed either specifically or selectively in the muscle tissues, whereas only one of the nine that scored low for these motifs expressed in muscle. Knockouts of putative regulatory elements in the promoter of the mlc-2 and unc-89 genes show that they significantly contribute to muscle expression and act in a synergistic manner. We find that these DNA motifs are also present in the muscle promoters of C. briggsae, indicating that they are functionally conserved in the nematodes.
GuhaThakurta
Debraj
D
Department of Genetics, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
Schriefer
Lawrence A
LA
Waterston
Robert H
RH
Stormo
Gary D
GD
D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D017173:Caenorhabditis elegans / Q000235:genetics* / Q000378:metabolism; D017124:Conserved Sequence / Q000235:genetics; D017931:DNA Primers; D005786:Gene Expression Regulation; D049452:Green Fluorescent Proteins / Q000378:metabolism; D018482:Muscle, Skeletal / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000235:genetics; D012045:Regulatory Sequences, Nucleic Acid / Q000235:genetics*; D016415:Sequence Alignment; D013045:Species Specificity; D014158:Transcription, Genetic
D017931:DNA Primers; D049452:Green Fluorescent Proteins