mouse strain Tg(tetO-Ptf1a,lacZ)Macd mouse strain A mouse strain containing a transgene in which bicistronic Ptf1a-lacZ (transgene) is driven by the TRE promoter (NCBI Gene ID: ). Mice hemi- or homozygous for the transgene are viable, fertile, normal size, and do not display any behavioral abnormalities. Expression of the bicistronic transgene is directed by a heptameric tetO repeat linked to the CMV minimal promoter (collectively the tetracycline-response element). The mice do not express lacZ until a tetracycline-gransactivator (tTA) protein is produced; thereafter Ptf1a and lacZ genes are highly expressed. This mouse was designed to be mated to an apancreatic targeted mutant with tTAoff in place of the Ptf1a coding sequence (see BCBC strain M321). The combined genetic alterations provide normal pancreatic development and function until doxycycline-administration render the mice conditionally null of Ptf1a. This approach allows embryonic developmental arrest at desired stages or cessation of gene function in adult mice for the pancreas, cerebellum, retina, dorsal spinal cord and possibly hypothalamus. This transgenic mouse may be useful in studies of pancreatic endocrine/exocrine development and function, diabetes, and and certain defects of the CNS. This transgenic can also be bred with other tTA strains for conditional mutation analysis. Person: Mark A. Magnuson, Jill Lindner, Jean-Philippe Cartailler Tg(tetO-Ptf1a,lacZ)Macd Vanderbilt University Medical Center