Abstract
The prevalence of clinical celiac disease has been shown to vary both across time and between genetically similar populations. Differences in wheat antigenicity and transglutaminase substrate properties are a possible explanation for these differences. This study assessed the antigenicity and transglutaminase substrate specificities of gliadins from regions of high and low celiac disease prevalence. Gliadin was extracted from three commercial US wheat sources and two Irish sources. SDS-PAGE and western blotting revealed minor, but significant variations in the gliadin extracts. However, ELISA showed no difference in the antigenicity of these gliadins. Transglutaminase pretreatment of gliadin resulted in no significant change in gliadin antigenicity and kinetic studies showed that the K ms of the various gliadins were very similar. Purified IgA and IgG had no effect on transglutaminase activity. In summary, minor variations in wheat gliadins are unlikely to explain the observed differences in disease expression across genetically similar populations.
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Keaveny, A.P., Offner, G.D., Bootle, E. et al. No Significant Difference in Antigenicity or Tissue Transglutaminase Substrate Specificity of Irish and US Wheat Gliadins. Dig Dis Sci 45, 755–762 (2000). https://doi.org/10.1023/A:1005404012558
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DOI: https://doi.org/10.1023/A:1005404012558