Systemic Lupus Erythematosus Patients Exhibit Reduced Expression of CLEC16A Isoforms in Peripheral Leukocytes

Systemic lupus erythematosus (SLE) is a prototypic autoimmune disease with multiple etiological factors. The SLE susceptibility locus on chromosome 16p13 encodes a novel gene CLEC16A and its functional relationship with SLE is unclear. This study aimed to investigate the expression correlation of the two major CLEC16A spliced transcripts with SLE development. Expressions of the long (V1) and short (V2) CLEC16A isoforms in the peripheral blood mononuclear cells (PBMCs) were assayed by quantitative real time PCR and compared between healthy individuals and SLE patients. Correlation of CLEC16A isoform expression levels with SLE susceptibility, disease severity and twelve clinical parameters were also evaluated. Full length transcripts of CLEC16A V1 and V2 isoforms were readily amplified from PBMCs of healthy controls and patients at varying abundance. Compared with healthy controls (n = 86), expression levels of V1 and V2 were significantly reduced by ~two- and four-fold respectively in SLE patients (n = 181). The relative V2/V1 ratio was also significantly reduced by approximately two-fold. With regard to SLE disease parameters, only a weak positive correlation was found between CLEC16A V1 expression levels and SLE disease activity index (SLEDAI) score. Taken together, CLEC16A was found to be a susceptibility factor for SLE, with possible contribution to the development of the disease.published_or_final_versio

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