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. 1995 Apr 1;307(Pt 1):9–16. doi: 10.1042/bj3070009

Cloning, expression and chromosomal localization of the rat pancreatitis-associated protein III gene.

N J Dusetti 1, J M Frigerio 1, C Szpirer 1, J C Dagorn 1, J L Iovanna 1
PMCID: PMC1136738  PMID: 7717998

Abstract

PAP III belongs to the family of pancreatitis-associated proteins, recently characterized as pancreatic secretory proteins structurally related to C-type lectins, and whose expression is induced during the acute phase of pancreatitis. In this paper, we describe the cloning, characterization and chromosomal localization of the rat PAP III gene. The gene was isolated from a genomic library using a PCR-based method and characterized over 2.5 kb of gene sequence and 1.7 kb of 5'-flanking sequence. The 5' end of the coding sequence was determined by primer extension of the PAP III transcript. The PAP III coding sequence spanned over six exons. We found striking similarities between PAP III and PAP I and II genes, in genomic organization as well as in promoter sequences. Moreover, the rat PAP III gene was mapped to chromosome 4 using mouse-rat hybrid cells, a localization which coincides with that of the PAP I and II genes. The three genes could therefore derive from the same ancestral gene by duplication. Expression of the PAP III gene was compared with that of PAPs I and II. Expression levels were similar in pancreas, where PAP III mRNA concentration increased within 6 h following induction of pancreatitis, reached maximal levels (> 200 times control values) at 24-48 h, and decreased thereafter. In the intestinal tract, where PAP II is not expressed, the pattern of PAP III expression was comparable with that of PAP I; fasting induced a decrease in its mRNA concentration by more than 80%, which could be reversed within 6 h upon feeding. PAP III is therefore a new member of the PAP gene family, more closely related to the PAP I gene.

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