Genetic risk and longitudinal disease activity in systemic lupus erythematosus using targeted maximum likelihood...

Area of Science:

• Immunology
• Genetics
• Rheumatology

Background:

• Systemic Lupus Erythematosus (SLE) is a complex autoimmune disease with known genetic and environmental risk factors.
• The causal relationship between genetic predisposition and SLE disease activity remains unclear.

Purpose of the Study:

• To investigate the causal association between a genetic risk score (GRS) and disease activity in SLE patients.
• To assess the influence of genetic variants on clinically relevant SLE disease activity over time.

Main Methods:

• Utilized longitudinal-targeted maximum likelihood estimation for causal inference.
• Analyzed a GRS of 41 SLE-associated variants in 942 individuals from a multiethnic cohort.
• Measured disease activity using the Systemic Lupus Activity Questionnaire (SLAQ) across nine time points.

Main Results:

• No significant difference in SLAQ scores was found between high and low GRS groups across nine time points.
• After controlling for covariates and multiple testing, 12 individual SNPs showed significant associations with SLAQ score changes at later time points.
• Causal modeling indicated that individual SLE risk variants may influence disease activity longitudinally.

Conclusions:

• Overall genetic risk, as measured by a GRS, does not appear to causally drive clinically important SLE disease activity.
• Specific genetic variants (SNPs) may contribute to changes in SLE disease activity over time.
• Environmental and other biological factors likely play a significant role in SLE pathogenesis and activity.