Y RNA derived small RNAs in Sjögren's syndrome: Candidate biomarkers?

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Anti-Ro and anti-La antibodies are important in pathogenesis and diagnosis of Sjögren's syndrome (SS). Ro60, Ro52 and La are RNA binding proteins of Y RNA, which were discovered more than three decades ago. Significance of Y RNA is not appreciated as much as Ro and La in SS. It can be hypothesised that 5′-YsRNA, short fragment derived from Y RNA may be recognized by TLR7 in pDC, which induces type I interferon signature in SS. New genomics tools, namely RNA seq, enables assay of 5′-YsRNA in blood. 5′-YsRNA has the potential to be a novel biomarker of SS.

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