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Mol Cell Biol. 1987 January; 7(1): 326-334

Tissue-specific and insulin-dependent expression of a pancreatic amylase gene in transgenic mice.

ABSTRACT

The regulatory properties of mouse pancreatic amylase genes include exclusive expression in the acinar cells of the pancreas and dependence on insulin and glucocorticoids for maximal expression. We have characterized a murine pancreatic amylase gene, Amy-2.2y, whose promoter sequence is 30% divergent from those of previously sequenced amylase genes. To localize sequences required for tissue-specific and hormone-dependent activation, we established two lines of transgenic mice. The first line contained a single copy of the complete Amy-2.2y gene as well as 9 kilobases of 5'-flanking sequence and 5 kilobases of 3'-flanking sequence. The second line carried a minigene which included 208 base pairs of 5'-flanking sequence and 300 base pairs of 3'-flanking sequence. In both lines the transgene was expressed at high levels exclusively in the pancreas. Both constructs were dependent on insulin and induced by dexamethasone. Thus, the transferred genes contained the sequences required for tissue-specific and hormonally regulated expression.

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