RGL4 (ral guanine nucleotide dissociation stimulator like 4) is a guanyl-nucleotide exchange factor that functions in Ras protein signal transduction at the plasma membrane. While direct mechanistic studies are limited in the provided literature, RGL4 appears to play roles in immune cell regulation and inflammatory responses across multiple disease contexts. In septic shock, RGL4 is upregulated and serves as a diagnostic biomarker with strong predictive value (ROC = 0.914) 1. Single-cell transcriptomics identified RGL4 as a marker of Neu1 neutrophil subtype, which is associated with septic shock severity and SOFA scores 2. In pediatric sepsis, RGL4 demonstrates causal associations with disease risk through Mendelian randomization analysis, suggesting an inflammatory role 3. In bronchopulmonary dysplasia, RGL4 was identified as one of eight hub genes potentially involved in mitophagy and immune-mediated inflammatory responses 4. Conversely, in lung adenocarcinoma, low RGL4 expression correlates with poor prognosis and altered tumor-infiltrating immune cell infiltration, including memory B cells, CD8+ T cells, and neutrophils 5. In acute myeloid leukemia, RGL4 is a survival-related gene with reduced expression in patient samples compared to healthy controls 2. RGL4 expression changes post-treatment, suggesting potential therapeutic relevance 2. These findings position RGL4 as a multifunctional biomarker in inflammatory and malignant diseases, though mechanistic studies are needed to clarify its precise molecular functions beyond its role as a guanine nucleotide exchange factor.