Pleiotropic recessive mutation glass-like (gl-l) found in region 8C10–8E of the X chromosome was shown to cause glass-like eyes having no boundaries between facets and a nonuniform pigment distribution determined by the endogenous white. The gl-lmutation completely inhibited expression of the mini-white transgene contained in several constructs, but the effect depended on the site of construct insertion in the genome. The mutation had no effect on the expression of the white transgene having the enhancer and flanked by insulators. The gl-l mutation did not affect the extent of mosaic eye pigmentation when a construct with mini-white was inserted in the telomeric or pericentric region. However, in most cases it completely inhibited the mosaic mini-white expression when cloned heterochromatic repeats were adjacent to the reporter gene in a construct. The gl-l gene was assumed to play a role in the formation of the chromatin structure, because the effect of its mutation on expression of the white transgene depended on the transgene insertion site, the presence of insulators or an enhancer in the vicinity of the transgene, and on the adjacent heterochromatic repeats.
Russian Journal of Genetics – Springer Journals
Published: Oct 18, 2004
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