title: Lack of association of a functional single nucleotide polymorphism of PTPN22, encoding lymphoid protein phosphatase, with susceptibility to Henoch-Schönlein purpura.
abstract: OBJECTIVE
  To assess the possible association between the PTPN22 gene 1858C-->T polymorphism and the susceptibility to Henoch-Schönlein purpura (HSP) and determine if this polymorphism is implicated in the severity of this systemic vasculitis.
  
  
  METHODS
  Fifty-seven unselected patients from Northwest Spain with primary systemic vasculitis, classified as HSP according to previously proposed criteria, with a follow-up of at least 2 years and 229 healthy controls, were included in this study. All the individuals were of Spanish Caucasian origin. Genotyping of the PTPN22 gene 1858C-->T polymorphism was performed by real time PCR technology, using TaqMan 5' allelic discrimination assay.
  
  
  RESULTS
  No significant differences in allele or genotype distribution frequencies for the PTPN22 gene polymorphism were observed between HSP patients and controls. It was also the case when HSP patients were stratified for the presence of severe gastrointestinal complications (n = 46), nephritis (n= 37) or permanent renal involvement (renal sequelae) (n = 12).
  
  
  CONCLUSIONS
  Our results do not support a potential implication of the PTPN22 gene polymorphism in the susceptibility to and clinical expression of HSP.
authors: The Consejo Superior de Investigaciones Cientificas (CSIC), Granada, Spain.
authors: G
authors: G
authors: Orozco
authors: J A
authors: JA
authors: Miranda-Filloy
authors: J
authors: J
authors: Martin
authors: M A
authors: MA
authors: Gonzalez-Gay
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006801:Humans; D011695:IgA Vasculitis / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D054596:Protein Tyrosine Phosphatase, Non-Receptor Type 22 / Q000235:genetics*; D013030:Spain; D044465:White People / Q000235:genetics
chemical_list: C516765:PTPN22 protein, human; D054596:Protein Tyrosine Phosphatase, Non-Receptor Type 22