title: PTPN22 1858T allele is associated with younger age at onset of type 1 diabetes and is not related to subsequent thyroid autoimmunity.
abstract: To evaluate the prevalence of PTPN22 C1858T polymorphism in young type 1 diabetes patients with or without autoimmune thyroiditis. Genotyping was performed in 209 controls and 243 patients diagnosed with diabetes at median age of 8.6 years. Diabetes-related autoimmunity was assessed at diagnosis of the disease, while thyroid-related autoimmunity was determined at diabetes onset and at annual intervals up to 15 years of follow-up. The 1858T allele frequency was 15.2% in patients and 10.5% in controls (odds ratio 1.53, p = 0.037). 1858T positive patients were significantly younger at diagnosis of diabetes than those without this allele (p = 0.003). No association was found between C1858T polymorphism and diabetes-related autoimmunity (p = 0.173) or thyroid autoimmune disease (p = 0.321), respectively. We conclude that PTPN22 1858T allele is an independent risk factor for type 1 diabetes and associated with younger age at the onset of the disease. However, no association with concomitant thyroid autoimmunity was found.
authors.affiliation: Diabetes Center for Children and Adolescents, Children's Hospital auf der Bult, Hannover, Germany. kordonouri@hka.de
authors.forename: Olga
authors.initials: O
authors.lastname: Kordonouri
authors.forename: Reinhard
authors.initials: R
authors.lastname: Hartmann
authors.forename: Klaus
authors.initials: K
authors.lastname: Badenhoop
authors.forename: Heinrich
authors.initials: H
authors.lastname: Kahles
authors.forename: Jorma
authors.initials: J
authors.lastname: Ilonen
mesh_terms: D000293:Adolescent; D017668:Age of Onset; D001323:Autoantibodies / Q000097:blood / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D003922:Diabetes Mellitus, Type 1 / Q000150:complications / Q000453:epidemiology / Q000235:genetics* / Q000276:immunology; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D007223:Infant; D008297:Male; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D054596:Protein Tyrosine Phosphatase, Non-Receptor Type 22 / Q000235:genetics*; D013967:Thyroiditis, Autoimmune / Q000150:complications / Q000453:epidemiology / Q000235:genetics* / Q000276:immunology
chemical_list: D001323:Autoantibodies; C516765:PTPN22 protein, human; D054596:Protein Tyrosine Phosphatase, Non-Receptor Type 22