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ORIGINAL ARTICLE
Year : 2017  |  Volume : 12  |  Issue : 4  |  Page : 214-218

The protein tyrosine phosphatase, nonreceptor type 22-1858C->T (rs2476601) polymorphism is not a genetic risk factor for systemic lupus erythematosus in Indian Tamils


1 Department of Clinical Immunology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
2 Department of Pediatrics, Genetic Services Unit, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
3 Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

Correspondence Address:
Vir Singh Negi
Department of Clinical Immunology, SSB 4th Floor, Jawaharlal Institute of Postgraduate Medical Education and Research, Dhanwantari Nagar, Puducherry - 605 006
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/injr.injr_90_17

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Background: Systemic lupus erythematosus (SLE), a systemic autoimmune disease, occurs due to disruption of immune homeostasis against self-antigens. The etiology of SLE is complex and multiple genetic factors contribute to disease susceptibility and clinical phenotypes. Protein tyrosine phosphatase, nonreceptor type 22 (PTPN22) is a lymphoid-specific phosphatase that negatively regulates T-cell receptor signaling and is responsible for the maintenance of T-cell homeostasis. Genetic aberrations affecting the function of PTPN22 result in the proliferation of autoreactive T-cells and development of autoimmune diseases. Methods: We carried out a case–control genetic study to analyze the association of PTPN22 R620W polymorphism (rs2476601) with disease susceptibility and clinical and autoantibody profile in Indian Tamils with SLE. Three hundred SLE patients satisfying the 1997 revised American College of Rheumatology classification criteria for SLE were enrolled in the study. Disease activity was measured using the SLE Disease Activity Index. We recruited 460 age-, sex-, and ethnicity-matched individuals without a family history of autoimmune diseases as control population. Genomic DNA was extracted from the blood sample by salting-out method. The PTPN22-1858C->T (rs2476601) polymorphism was screened by polymerase chain reaction-restriction fragment length polymorphism. Results: The frequency of the ancestral allele “C” was similar in both cases and controls (99.3% and 99.8%, respectively) and the mutant allele “T” was less frequent in South Indian Tamil population; it did not influence clinical or serological phenotypes. Conclusion: Our findings suggest that the PTPN22 (rs2476601) polymorphism is less frequent and did not confer a risk for lupus or its associated clinical or serological phenotypes in South Indian Tamils.


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