title: Calpain 10 and development of diabetes mellitus in cystic fibrosis.
abstract: Diabetes mellitus (DM) and abnormal glucose tolerance (IGT) are common in cystic fibrosis (CF). The loss of pancreatic beta-cells due to pancreatic fibrosis is thought to be one of the principal causes of diabetes in CF, but the aetiology of DM remains somewhat puzzling. Genetic factors may contribute to the development of CF related diabetes (CFRD). The purpose of this study was to investigate the role of polymorphisms in six genes on IGT or DM incidence. PCR and dHPLC were used to screen DNA samples for polymorphisms. Using 2-h oral glucose tolerance tests, 163 adult pancreatic insufficient CF patients have been subdivided in 3 groups: 54 NGT (normal glucose tolerance), 33 IGT and 76 CFRD. We found the first evidence for the association between CFRD and UCSNP-19 polymorphism in the CAPN10 gene. The UCSNP-19 genotype distribution differed significantly between NGT, IGT and CFRD groups. The difference reflected an increase in the 22 genotype (3 copies of 32-bp sequence) in IGT and CFRD patients (p=0.05). Odds ratio for the homozygote 22 versus homozygote 11 was 3.4 (p=0.02). All allele and genotype distributions for the other polymorphisms were similar in the three groups. In conclusion, our observations suggest that UCSNP-19 of CAPN10 may be involved in the pathogenesis of diabetes in CF.
authors.affiliation: Laboratoire de Biochimie et Génétique Moléculaire and Université René Descartes Paris 5, Institut Cochin, INSERM U567, GDPM, Paris, France.
authors.forename: Salma
authors.initials: S
authors.lastname: Derbel
authors.forename: Celine
authors.initials: C
authors.lastname: Doumaguet
authors.forename: Dominique
authors.initials: D
authors.lastname: Hubert
authors.forename: Helene
authors.initials: H
authors.lastname: Mosnier-Pudar
authors.forename: Sophie
authors.initials: S
authors.lastname: Grabar
authors.forename: Jamel
authors.initials: J
authors.lastname: Chelly
authors.forename: Thierry
authors.initials: T
authors.lastname: Bienvenu
mesh_terms: D000328:Adult; D000483:Alleles; D001786:Blood Glucose / Q000378:metabolism; D002154:Calpain / Q000235:genetics*; D002851:Chromatography, High Pressure Liquid; D003550:Cystic Fibrosis / Q000097:blood / Q000150:complications* / Q000235:genetics; D004247:DNA / Q000235:genetics*; D003920:Diabetes Mellitus / Q000097:blood / Q000209:etiology* / Q000235:genetics; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic
chemical_list: D001786:Blood Glucose; D004247:DNA; D002154:Calpain; C415197:calpain 10