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- Title
A Genetic Screen for Dominant Modifiers of a Small-Wing Phenotype in Drosophila melanogaster Identifies Proteins Involved in Splicing and Translation.
- Authors
Coelho, Carmen M. A.; Kolevski, Benjamin; Walker, Cherryl D.; Lavagi, Irene; Shaw, Thomas; Ebert, Anselm; Leevers, Sally J.; Marygold, Steven J.
- Abstract
Studies in the fly, Drosophila melanogaster, have revealed that several signaling pathways are important for the regulation of growth. Among these, the insulin receptor/phosphoinositide 3-kinase (P13K) pathway is remarkable in that it affects growth and final size without disturbing pattern formation. We have used a small-wing phenotype, generated by misexpression of kinase-dead P13K, to screen for novel mutations that specifically disrupt organ growth in vivo. We identified several complementation groups that dominantly enhance this small-wing phenotype. Meiotic recombination in conjunction with visible markers and single-nucleotide polymorphisms (SNPs) was used to map five enhancers to single genes. Two of these, nucampholin and pp8, encode pre-rnRNA splicing factors. The three other enhancers encode factors required for mRNA translation: pixie encodes the Drosophila ortholog of yeast RLI1, and RpL5 and RpL38 encode proteins of the large ribosomal subunit. Interestingly, mutations in several other ribosomal protein-encoding genes also enhance the small-wing phenotype used in the original screen. Our work has therefore identified mutations in five previously uncharacterized Drosophila genes and provides in vivo evidence that normal organ growth requires optimal regulation of both pre-rnRNA splicing and mRNA translation.
- Subjects
GENETIC engineering; DROSOPHILA melanogaster; CELLULAR signal transduction; PROTEINS; PHOSPHOINOSITIDES; MESSENGER RNA
- Publication
Genetics, 2005, Vol 171, Issue 2, p597
- ISSN
0016-6731
- Publication type
Article
- DOI
10.1534/genetics.105.045021