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. 1982;1(1):93–98. doi: 10.1002/j.1460-2075.1982.tb01130.x

Molecular cloning of the white locus region of Drosophila melanogaster using a large transposable element

ML Goldberg 1,1, R Paro 1, WJ Gehring 1,*
PMCID: PMC553001  PMID: 16453411

Abstract

We report the molecular cloning of a chromosome segment including the white locus of Drosophila melanogaster. This region was isolated using a deficiency extending from the previously cloned heat-shock puff sequences at 87A7 to a large transposable element containing the loci white and roughest.FB-NOF, a 7.5 kb element with partial homology to a family of inverted repeat sequences (Potter et al., 1980), is found very near the deficiency breakpoint, and is followed by DNA originating from the white locus region. Sequences totalling ˜60 kb surrounding this initial entry point were obtained by the cloning of successively overlapping fragments from a wild-type strain. Several rearrangement breakpoints have been mapped relative to the cloned DNA; these define the limits of the white locus and further differentiate the “white proximal region”, thought to function in gene regulation, from the remainder of the locus. Insertion of the dispersed repetitive element copia into the white locus is observed in strains carrying the white-apricot allele. Analysis of several white-apricot revertants suggests that copia insertion is responsible for the apricot eye color phenotype.

Keywords: Drosophila melanogaster, fold-back DNA, transposable element, white locus

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