5 pages, 1 figure, 2 tables.-- PMID: 9536820 [PubMed].-- PMCID: PMC1752462.Full-text version available Open Access via PubMed Central at: http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=9536820[Objective] The aim of this study was to investigate the relation between the polymorphism of large molecular weight proteasome (LMP) (LMP2-LMP7) and transporter associated with antigen processing (TAP) (TAP1-TAP2) genes and rheumatoid arthritis (RA).[Methods] Sixty RA patients and 102 ethnically matched unrelated healthy subjects were typed for LMP, TAP, and disease associated HLA-DRB1 alleles by using a new strategy based on polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) with amplification created restriction sites.[Results] The polymorphism of LMP (LMP2-LMP7) and TAP (TAP1-TAP2) genes was examined in shared epitope positive and negative RA patients and controls. No significant differences in the LMP or TAP allele frequencies were observed between the total patient and control groups or the patients and controls positive or negative for the shared epitope.[Conclusion] The data suggest that the polymorphisms of LMP and TAP genes do not have an important influence in the pathogenesis of RA, although larger studies will be needed to provide more conclusive evidence on the role of these genes in RA. A new, highly reliable strategy for typing LMP alleles is also described.This work was supported by SAF93-0021 and SAF97-0046 grants from Plan Nacional de I+D (CICYT). A Nieto has a fellowship from FIS nº95/5333.Peer reviewed