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The P.Arg435his Variation of Igg3 With High Affinity to Fcrn Is Associated With Susceptibility for Pemphigus Vulgaris-Analysis of Four Different Ethnic Cohorts Publisher Pubmed



Recke A1, 2 ; Konitzer S1 ; Lemcke S1 ; Freitag M1 ; Sommer NM1 ; Abdelhady M3 ; Amoli MM4 ; Benoit S5 ; Elchennawy F6 ; Eldarouti M3 ; Eming R7 ; Glaser R8 ; Gunther C9 ; Hadaschik E10 Show All Authors
Authors
  1. Recke A1, 2
  2. Konitzer S1
  3. Lemcke S1
  4. Freitag M1
  5. Sommer NM1
  6. Abdelhady M3
  7. Amoli MM4
  8. Benoit S5
  9. Elchennawy F6
  10. Eldarouti M3
  11. Eming R7
  12. Glaser R8
  13. Gunther C9
  14. Hadaschik E10
  15. Homey B11
  16. Lieb W12, 13
  17. Peitsch WK14, 15
  18. Pfohler C16
  19. Robati RM17
  20. Saeedi M17
  21. Sardy M18
  22. Sticherling M19
  23. Uzun S20
  24. Worm M21
  25. Zillikens D2
  26. Ibrahim S1
  27. Vidarsson G22
  28. Schmidt E1
  29. Kreuter A23, 24
  30. Zouboulis CC25
  31. Daschlein G26
  32. Steinbrink K27
  33. Kunz M28
  34. Hunzelmann N29
  35. Goetze S30

Source: Frontiers in Immunology Published:2018


Abstract

IgG3 is the IgG subclass with the strongest effector functions among all four IgG subclasses and the highest degree of allelic variability among all constant immunoglobulin genes. Due to its genetic position, IgG3 is often the first isotype an antibody switches to before IgG1 or IgG4. Compared with the other IgG subclasses, it has a reduced half-life which is probably connected to a decreased affinity to the neonatal Fc receptor (FcRn). However, a few allelic variants harbor an amino acid replacement of His435 to Arg that reverts the half-life of the resulting IgG3 to the same level as the other IgG subclasses. Because of its functional impact, we hypothesized that the p.Arg435His variation could be associated with susceptibility to autoantibody-mediated diseases like pemphigus vulgaris (PV) and bullous pemphigoid (BP). Using a set of samples from German, Turkish, Egyptian, and Iranian patients and controls, we were able to demonstrate a genetic association of the p.Arg435His variation with PV risk, but not with BP risk. Our results suggest a hitherto unknown role for the function of IgG3 in the pathogenesis of PV. © 2018 Recke, Konitzer, Lemcke, Freitag, Sommer, Abdelhady, Amoli, Benoit, El-Chennawy, Eldarouti, Eming, Glaser, Gunther, Hadaschik, Homey, Lieb, Peitsch, Pfohler, Robati, Saeedi, Sardy, Sticherling, Uzun, Worm, Zillikens, Ibrahim, Vidarsson, Schmidt and the German AIBD Genetic Study Group.
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