Low Levels of GRP-Ca Expression in Transgenic Mice

The GRP-Ca gene of the rat encodes a member of the glutamine/glutamic-acid-rich protein (GRP) family. This gene is expressed in a highly tissue-specific fashion, with transcription being found only in the acinar cells of the submandibular gland (SMG). To begin to define the cis-acting elements gover...

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Bibliographic Details
Published in:Journal of dental research 2000-04, Vol.79 (4), p.926-929
Main Authors: Ten Hagen, K.G., Balys, M.M.
Format: Article
Language:English
Subjects:
Animals
Blotting, Northern
Blotting, Southern
Dentistry
Gene Expression
Isomerism
Liver - metabolism
Mice
Mice, Inbred C57BL
Mice, Inbred Strains
Mice, Transgenic
Rats
RNA - genetics
Salivary Proteins and Peptides - genetics
Subacute Sclerosing Panencephalitis
Submandibular Gland - metabolism
Transcription, Genetic - genetics
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Summary:The GRP-Ca gene of the rat encodes a member of the glutamine/glutamic-acid-rich protein (GRP) family. This gene is expressed in a highly tissue-specific fashion, with transcription being found only in the acinar cells of the submandibular gland (SMG). To begin to define the cis-acting elements governing GRP-Ca expression, we constructed transgenic mice containing the rat GRP-Ca gene plus 9.5 kb of 5' genomic sequence and 1 kb of 3' genomic sequence. Expression of GRP-Ca was detectable in progeny from only 1 of 3 independent founders. Expression levels of the transgenic GRP-Ca were much lower than the native GRP-Ca found in the rat SMG. Furthermore, GRP-Ca in transgenic mice was not tissue-specifically expressed, being found in both the SMG/SLG complex and the liver. These results indicate that the genomic region of GRP-Ca included in these transgenic mice is not sufficient to confer the high levels of tissue-specific expression seen in the rat.
ISSN:0022-0345
1544-0591
DOI:10.1177/00220345000790040701