• SPATS2L is identified as an SLE eGene correlated with disease activity and involved in the type I IFN pathway.
• SPATS2L expression is induced by type I IFN in a dose- and time-dependent manner, acting as a positive feedback regulator.
• Silencing SPATS2L in PBMCs from SLE patients reverses IFN pathway activation, highlighting its therapeutic potential.
• SPATS2L may serve as a biomarker for disease activity and a target for intervention in lupus.
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