CTLA-4 Gene Variants and Immune Response in Autoimmunity
Summary
Cytotoxic T-lymphocyte antigen 4 (CTLA-4) is a critical inhibitory receptor expressed on T cells that governs the threshold of T-cell activation and maintains self-tolerance. Genetic variation within the CTLA4 locus, including signal peptide polymorphisms and non-synonymous substitutions, can alter protein folding, glycosylation and surface expression, thereby modulating immune checkpoints. Certain alleles predispose individuals to autoimmune disorders by diminishing CTLA-4’s inhibitory function, leading to unchecked T-cell proliferation and pro-inflammatory cytokine release. In parallel, alternative splicing gives rise to a soluble isoform, sCTLA-4, which circulates in serum and exerts context-dependent effects on T-cell priming and differentiation. Aberrant ratios of membrane-bound to soluble forms have been observed in patients with systemic lupus erythematosus, rheumatoid arthritis and type 1 diabetes, suggesting that both genetic and post-transcriptional mechanisms converge to shape autoimmunity. Understanding how CTLA-4 variants affect glycosylation efficiency, protein trafficking and ligand engagement is pivotal for refining diagnostic biomarkers, stratifying patient risk and optimising checkpoint-targeted therapies. Recent advances in high-throughput genomics and functional assays have begun to map variant-specific impacts on T-cell signalling pathways, offering mechanistic insight into the interplay between genotype and immune phenotype in human autoimmunity.
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CTLA-4 Gene Variants and Immune Response in Autoimmunity publication trend
The graph below shows the total number of articles in ctla-4 gene variants and immune response in autoimmunity across all publications each year (not limited to Nature Index journals).
Technical terms
CTLA-4: An inhibitory immune checkpoint receptor on T cells that downregulates activation upon binding CD80/CD86.
Single-nucleotide polymorphism (SNP): A DNA sequence variation at a single nucleotide position that may affect gene function or regulation.
Glycosylation: The enzymatic addition of sugar moieties to proteins, crucial for proper folding, stability and cell-surface expression.
Soluble CTLA-4 (sCTLA-4): An alternatively spliced isoform of CTLA-4 that lacks the transmembrane domain and circulates in bodily fluids.
References
- A Common Autoimmunity Predisposing Signal Peptide Variant of the Cytotoxic T-lymphocyte Antigen 4 Results in Inefficient Glycosylation of the Susceptibility Allele*. Journal of Biological Chemistry (2002).
- Exploration of the association between the single-nucleotide polymorphism of co-stimulatory system and rheumatoid arthritis. Frontiers in Immunology (2023).
- The Soluble Form of CTLA‐4 from Serum of Patients with Autoimmune Diseases Regulates T‐Cell Responses. BioMed Research International (2014).
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