Human glucagon-like peptide-1 receptor gene in NIDDM. Identification and use of simple sequence repeat polymorphisms in genetic analysis.
Glucagon-like polypeptides, GLP-1-(7-36)-amide and GLP-1-(7-37), are important regulators of insulin synthesis and secretion by islet beta-cells. The hypothesis to be tested in this study was that defects in the islet beta-cell GLP-1 receptor gene contribute to the impaired glucose-regulated insulin secretion of non-insulin-dependent diabetes mellitus (NIDDM). Human islet GLP-1 receptor genomic clones were isolated, and two highly polymorphic simple sequence repeat regions (GLP-1R-CA1 and GLP-1R-CA3) were identified. Polymerase chain reaction assays were developed to define alleles. For GLP-1R-CA1, 14 alleles were observed in African-Americans (heterozygosity [het] = 0.78) and 6 alleles in Caucasians (het = 0.67). For GLP-1R-CA3, 16 alleles were observed in African Americans (het = 0.89) and 8 alleles in Caucasians (het = 0.83). By genotyping all members of the 40 reference Centre d'Etude du Polymorphisme Humain pedigrees at GLP-1R-CA3, the human GLP-1 receptor gene was uniquely placed on chromosome 6p between GLO1 and D6S19, 20.4 cM from human leukocyte antigen. To assess the possible role of the GLP-1 receptor gene in determining the genetic susceptibility to NIDDM, allelic frequencies of GLP-1R-CA1 and GLP-1R-CA3 were compared between African-American NIDDM patients (n = 95) and control subjects (n = 93). The frequencies did not differ between the two groups at either GLP-1R-CA1 or GLP-1R-CA3. The GLP-1 receptor gene simple-sequence repeat polymorphisms were used for linkage analysis in Utah Mormon pedigrees (n = 16) with NIDDM.(ABSTRACT TRUNCATED AT 250 WORDS)
Tanizawa
Y
Y
Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110.
Riggs
A C
AC
Elbein
S C
SC
Whelan
A
A
Donis-Keller
H
H
Permutt
M A
MA
D000818:Animals; D001483:Base Sequence; D044383:Black People / Q000235:genetics; D002874:Chromosome Mapping; D002896:Chromosomes, Human, Pair 6; D017931:DNA Primers; D018076:DNA, Complementary / Q000302:isolation & purification; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics*; D005799:Genes, Dominant; D005808:Genes, Recessive; D000067757:Glucagon-Like Peptide-1 Receptor; D006801:Humans; D006822:Hybrid Cells; D051379:Mice; D008969:Molecular Sequence Data; D010375:Pedigree; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D011956:Receptors, Cell Surface / Q000235:genetics*; D018027:Receptors, Glucagon; D012091:Repetitive Sequences, Nucleic Acid; D012377:Rodentia; D044465:White People / Q000235:genetics; D001741:Black or African American
D017931:DNA Primers; D018076:DNA, Complementary; C000593833:GLP1R protein, human; C000593834:Glp1r protein, mouse; D000067757:Glucagon-Like Peptide-1 Receptor; D011956:Receptors, Cell Surface; D018027:Receptors, Glucagon