title: Association of protein tyrosine phosphatase-N1 polymorphisms with coronary calcified plaque in the Diabetes Heart Study.
abstract: Individuals with type 2 diabetes are at increased risk of cardiovascular disease (CVD) mortality and display increased levels of subclinical CVD. Genetic variation in PTPN1, a diabetes susceptibility gene, was investigated for a role in diabetic atherosclerosis. The PTPN1 gene encodes protein tyrosine phosphatase-1B, which is ubiquitously expressed and plays a role in the regulation of several signaling pathways. Subclinical atherosclerosis was assessed in 590 Caucasian participants with type 2 diabetes in the Diabetes Heart Study using B-mode ultrasound measurement of carotid intima-media thickness (IMT) and computed tomography measurement of carotid calcified plaque (CarCP) and coronary calcified plaque (CorCP). Twenty-three single nucleotide polymorphisms (SNPs) in PTPN1 were genotyped and assessed for association with IMT, CarCP, and CorCP. A total of 12 SNPs within a block of linkage disequilibrium encompassing the coding sequence of PTPN1 were significantly associated with CorCP (P values from <0.0001 to 0.043) and 3 SNPs also within the block approached significance (P values from 0.058 to 0.066). In addition, a nine-SNP haplotype (GACTTCAGO) was also associated with increased CorCP under a dominant model (P = 0.01). No association was detected with IMT or CarCP. The associated SNPs and haplotype are the same as those observed to be associated with type 2 diabetes, insulin resistance, and fasting glucose in previous studies. With the inclusion of the most likely haplo-genotype for each individual, the heritability estimate of CorCP increased from 0.53 +/- 0.1 to 0.57 +/- 0.1 (P = 8.1 x 10(-10)), suggesting a modest but detectable effect of this gene on the phenotype of CorCP in type 2 diabetic patients.
authors.affiliation: Department of Biochemistry, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157, USA.
authors.forename: Kathryn P
authors.initials: KP
authors.lastname: Burdon
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Bento
authors.forename: Carl D
authors.initials: CD
authors.lastname: Langefeld
authors.forename: Joel K
authors.initials: JK
authors.lastname: Campbell
authors.forename: J Jeffery
authors.initials: JJ
authors.lastname: Carr
authors.forename: Lynne M
authors.initials: LM
authors.lastname: Wagenknecht
authors.forename: David M
authors.initials: DM
authors.lastname: Herrington
authors.forename: Barry I
authors.initials: BI
authors.lastname: Freedman
authors.forename: Stephen S
authors.initials: SS
authors.lastname: Rich
authors.forename: Donald W
authors.initials: DW
authors.lastname: Bowden
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D002114:Calcinosis / Q000235:genetics*; D003327:Coronary Disease / Q000235:genetics*; D003924:Diabetes Mellitus, Type 2 / Q000150:complications*; D005260:Female; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D007333:Insulin Resistance; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D017027:Protein Tyrosine Phosphatases / Q000235:genetics*
chemical_list: C516607:PTPN1 protein, human; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D017027:Protein Tyrosine Phosphatases