Abstract
A cloned delta-crystallin gene of the chicken is preferentially expressed in lens cells after introduction into various mouse tissues. The level of expression in the lens epithelium is 20 times higher than in fibroblasts. Taking advantage of this system, we attempted to define regulatory regions of the delta-crystallin gene using a variety of deletion and substitution mutants. The results indicate that tissue-specific regulation of the delta-crystallin gene is mediated by the 5' end region of the gene; sequences upstream from -93 are not required for expression and sequences downstream from +58 are not involved in tissue specificity. The high expression in lens cells requires 5' flanking sequences of 80-bp long from the cap site, whereas the low expression in fibroblasts requires an additional 12 bp upstream sequence. Expression of both types is lost in a mutant with only 51 bp of the 5' flanking sequence. Thus, fine deletion analysis demonstrated that expression in lens cells and expression in fibroblasts are distinct not only in level but in regulation.
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