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. 1987 May;6(5):1375–1385. doi: 10.1002/j.1460-2075.1987.tb02378.x

Transformation and rescue of a flightless Drosophila tropomyosin mutant.

T Tansey, M D Mikus, M Dumoulin, R V Storti
PMCID: PMC553943  PMID: 3038522

Abstract

In the Drosophila flightless mutant Ifm(3)3, a transposable element inserted into the alternatively spliced fourth exon of the tropomyosin I (TmI) gene prevents proper expression of Ifm-TmI, the tropomyosin isoform found in indirect flight muscle. We have rescued the flightless phenotype of Ifm(3)3 flies using P-element-mediated transformation with a segment of the Drosophila genome containing the wild-type TmI gene plus 2.5 kb of 5' flanking and 2 kb of 3' flanking DNA. The inserted TmI gene is expressed with the proper developmental and tissue specificity, although its level of expression varies among the five transformed lines examined. These conclusions are based on analyses of flight, myofibrillar morphology, and TmI RNA and protein levels. A minimum of two copies of the inserted TmI gene per cell is necessary to restore flight to most of the flies in each line. We also show that the Ifm-TmI isoform is expressed in the leg muscle of wild-type flies and is decreased in Ifm(3)3 leg muscle. Homozygous Ifm(3)3 mutants do not jump. The ability to jump can be restored with a single copy of the wild-type TmI gene per cell.

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