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Background and purpose

Our objective was to map the genes responsible for poor glucose tolerance in a C57BL/6 (B6) mouse model, which provides a human model of non-insulin-dependent diabetes mellitus. Insulin secretion was found to be significantly lower in B6 than in C3H/He (C3H) mice (analysis of variance, P < 0.05) at 10, 20, and 30 minutes during the intraperitoneal glucose tolerance test (IPGTT: 1.5 g glucose/kg of body weight).

Methods

Mean 30-minute blood glucose values during IPGTT at 8, 9, and 10 weeks of age were used as a surrogate for glucose tolerance. The primers of 87 genetic microsatellite markers (14.9 +/-6.2 cM apart) genome-wide quantitative trait linkage (QTL) analysis in F2 and F3 mice with the highest and lowest (n = 15 for each extreme) 30-minute blood glucose values were used.

Results

Genome-wide QTL analysis confirmed the locus (D2Mit48) on chromosome 2, with a LOD score of 8.3, and the locus (D13Mit48) on chromosome 13, with a LOD score of 4.2 in F3. Direct sequencing of candidate genes, proprotein convertase-2 (PC2) on chromosome 2 and proprotein convertase-1/3 (PC1/PC3) on chromosome 13, failed to reveal a mutation or polymorphism specific to B6 mice.

Conclusions

Use of QTL mapping revealed two loci associated with poor glucose tolerance of B6."xsd:string
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http://purl.uniprot.org/citations/10894496http://purl.uniprot.org/core/author"Koizumi A."xsd:string
http://purl.uniprot.org/citations/10894496http://purl.uniprot.org/core/author"Nozaki J."xsd:string
http://purl.uniprot.org/citations/10894496http://purl.uniprot.org/core/author"Kayo T."xsd:string
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http://purl.uniprot.org/citations/10894496http://purl.uniprot.org/core/pages"296-302"xsd:string
http://purl.uniprot.org/citations/10894496http://purl.uniprot.org/core/title"Identification of two chromosomal loci determining glucose intolerance in a C57BL/6 mouse strain."xsd:string
http://purl.uniprot.org/citations/10894496http://purl.uniprot.org/core/volume"50"xsd:string
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