A diallelic RFLP of the CD3-epsilon chain of the clonotypic T-lymphocyte receptor is not associated with certain autoimmune diseases.

A diallelic restriction fragment length polymorphism of the CD3-epsilon (epsilon) gene, which encodes for an invariant component of the human T-lymphocyte receptor, is observed when using genomic DNA TaqI digests probed with a CD3-epsilon chain cDNA probe. This combination shows two alleles of 9.1 kb and 8.4 kb with a frequency of 0.66 and 0.34, respectively, in the Spanish population. None of these alleles is associated with susceptibility to juvenile rheumatoid arthritis (JRA) or insulin-dependent diabetes mellitus (IDDM).