Abstract：
BACKGROUND:The R620W variant in protein tyrosine phosphatase non-receptor 22 (PTPN22) is associated with rheumatoid arthritis (RA). The PTPN22 gene has alternatively spliced transcripts and at least two of the splice forms have been confirmed to encode different PTPN22 (LYP) proteins, but detailed information regarding expression of these is lacking, especially with regard to autoimmune diseases. METHODS:We have investigated the mRNA expression of known PTPN22 splice forms with TaqMan real-time PCR in relation to ZNF592 as an endogenous reference in peripheral blood cells from three independent cohorts with RA patients (n = 139) and controls (n = 111) of Caucasian origin. Polymorphisms in the PTPN22 locus (25 SNPs) and phenotypic data (gender, disease activity, ACPA and RF status) were used for analysis. Additionally, we addressed possible effects of methotrexate treatment on PTPN22 expression. RESULTS:We found consistent differences in the expression of the PTPN22 splice forms in unstimulated peripheral blood mononuclear cells between RA patients and normal controls. This difference was more pronounced when comparing the ratio of splice forms and was not affected by methotrexate treatment. CONCLUSIONS:Our data show that RA patients and healthy controls have a shift in balance of expression of splice forms derived from the PTPN22 gene. This balance seems not to be caused by treatment and may be of importance during immune response due to great structural differences in the encoded PTPN22 proteins.
journal_name
Genome Medjournal_title
Genome medicineauthors
Ronninger M,Guo Y,Shchetynsky K,Hill A,Khademi M,Olsson T,Reddy PS,Seddighzadeh M,Clark JD,Lin LL,O'Toole M,Padyukov Ldoi
10.1186/gm301subject
Has Abstractpub_date
2012-01-20 00:00:00pages
2issue
1issn
1756-994Xpii
gm301journal_volume
4pub_type
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