Rs4553808

rs4553808, also known as A/G-1661, is a SNP in the upstream activator sequence of the cytotoxic T lymphocyte associated antigen-4 CTLA4 gene. This gene encodes the CD152 antigen.

A study of 165 Swedish myasthenia gravis patients concluded that the rs4553808(G;G) homozygotes had an odds ratio of 0.05 (CI: 0.00286-0.874, p=0.0023) for the disease compared to healthy individuals, while the rs4553808(G) allele showed a less dramatic reduction in risk, with an odds ratio of 0.578 (CI: 0.373-0.897, p=0.015).