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Diabetes, Vol 44, Issue 4 389-393, Copyright © 1995 by American Diabetes Association

ARTICLES

Association of the prohormone convertase 2 gene (PCSK2) on chromosome 20 with NIDDM in Japanese subjects

H Yoshida, S Ohagi, T Sanke, H Furuta, M Furuta and K Nanjo
First Department of Medicine, Wakayama University of Medical Science, Japan.

Proinsulin is converted to insulin by the concerted action of two sequence-specific subtilisin-like proteases termed prohormone convertase 2 (PC2) and prohormone convertase 3. PC2 is a type II proinsulin-processing enzyme, and it cleaves the proinsulin molecule on the COOH-terminal side of dibasic peptide, Lys64-Arg65, which joins the C-peptide and the A-chain domains. We have previously cloned and characterized the exon-intron organization of the human PC2 gene (gene symbol PCSK2), localized this gene to human chromosome 20 band p11.2 by fluorescence in situ hybridization, and identified a simple tandem-repeat DNA polymorphism (STRP) in intron 2 of the form (CA)n, suitable for genetic studies. Since non-insulin-dependent diabetes mellitus (NIDDM) is associated with increased secretion of proinsulin and proinsulin-like molecules, we conducted a case-control study to determine whether a genetic variation in PCSK2 might contribute to the development of NIDDM. The study population consisted of 152 Japanese NIDDM subjects and 102 normal healthy nondiabetic control subjects matched for age and body mass index. The subjects were genotyped at the STRP in intron 2, and the results indicated a significant difference (P = 0.004) in the overall allele frequency distribution between the two groups. The A1 allele was found more frequently in NIDDM than in nondiabetic subjects (11 vs. 4%, P = 0.0068). The NIDDM patients were divided into two subgroups according to the presence or absence of the A1 allele.(ABSTRACT TRUNCATED AT 250 WORDS)
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 J. Biol. Chem.Home page
M. Furuta, R. Carroll, S. Martin, H. H. Swift, M. Ravazzola, L. Orci, and D. F. Steiner
Incomplete Processing of Proinsulin to Insulin Accompanied by Elevation of Des-31,32 Proinsulin Intermediates in Islets of Mice Lacking Active PC2
J. Biol. Chem., February 6, 1998; 273(6): 3431 - 3437.
[Abstract] [Full Text] [PDF]


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Copyright © 1995 by the American Diabetes Association.