To investigate the role of U12-type RNA splicing abnormalities in neutrophils of patients with systemic lupus erythematosus (SLE) and their potential contribution to immune dysregulation.
Approach:
Neutrophil Isolation: Neutrophils and low-density granulocytes (LDGs) were isolated from blood samples of SLE patients and healthy controls.
Western Blot and Flow Cytometry: Western blotting and flow cytometry were used to analyze protein expression and Nox activity in neutrophils.
RNA Sequencing: RNA sequencing was performed to assess splicing abnormalities and gene expression in neutrophils.
Alternative Splicing Analysis: Alternative splicing events were analyzed using rMATS to identify differences in splicing patterns.
Key Findings:
Impaired Nox activity was observed in SLE LDGs, linked to reduced CYBA expression.
Evidence of U12 intron retention was found in SLE LDGs.
Broad splicing abnormalities were identified, particularly affecting U12-type introns.
Interpretation:
Limitations:
The study primarily focuses on neutrophils, which may not represent the entire immune landscape in SLE.
The sample size and diversity of SLE patients may limit the generalizability of the findings.
by Luz P. Blanco, Binod Regmi, Carmelo Carmona-Rivera, Yudong Liu, Xiantao Wang, Philip M. Carlucci, Monica M. Jackson, Zerai Manna, Sarfaraz Hasni, Markus Hafner, Hong-Wei Sun, Mariana J. Kaplan
