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Updated: Aug 10, 2026

Recognition of Epidermal Transglutaminase by IgA and Tissue Transglutaminase 2 Antibodies in a Rare Case of Rhesus Dermatitis
Published on: December 15, 2011
A functional PTPN22 polymorphism associated with several autoimmune diseases is not associated with IgA deficiency in
Concepción Núñez1, Raquel López-Mejías, Alfonso Martínez
1Department of Clinical Immunology, Hospital Clínico San Carlos, Madrid, Spain. connunez@usc.es
Background:
The 1858C/T SNP of the PTPN22 gene has been associated with many autoimmune diseases, suggesting the existence of an inflammatory process common to all of them. We studied the association of that polymorphism with immunoglobulin A deficiency (IgAD) following a double approach: a case-control and a TDT study.
Methods:
A total of 259 IgAD patients and 455 unrelated matched controls, and 128 families were used for each approach. Comparisons were performed using Chi-Square tests or Fisher's exact test when necessary.
Results:
No association between the PTPN22 1858C/T SNP and IgA deficiency was found in any case (allelic frequencies 8% vs. 6% in patients and controls, respectively, OR= 1.14 (0.72-1.79), p= 0.56; TDT p = 0.08).
Conclusion:
The result obtained seems to reinforce the consideration of IgA deficiency as a primary immunodeficiency rather than an autoimmune disease.
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