The p.Arg435His variation of IgG3 with high affinity to FcRn is associated with susceptibility for Pemphigus Vulgaris: analysis of four different ethnic cohorts

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 to th...

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Hauptverfasser: Recke, Andreas (VerfasserIn) , Hadaschik, Eva (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 02 August 2018
In: Frontiers in immunology
Year: 2018, Jahrgang: 9
ISSN:1664-3224
DOI:10.3389/fimmu.2018.01788
Online-Zugang:Verlag, Volltext: https://doi.org/10.3389/fimmu.2018.01788
Verlag, Volltext: https://www.frontiersin.org/articles/10.3389/fimmu.2018.01788/full
Volltext
Verfasserangaben:Andreas Recke, Sarah Konitzer, Susanne Lemcke, Miriam Freitag, Nele Maxi Sommer, Mohammad Abdelhady, Mahsa M. Amoli, Sandrine Benoit, Farha El-Chennawy, Mohammad Eldarouti, Rüdiger Eming, Regine Gläser, Claudia Günther, Eva Hadaschik, Bernhard Homey, Wolfgang Lieb, Wiebke K. Peitsch, Claudia Pföhler, Reza M. Robati, Marjan Saeedi, Miklós Sárdy, Michael Sticherling, Soner Uzun, Margitta Worm, Detlef Zillikens, Saleh Ibrahim, Gestur Vidarsson, Enno Schmidt and the German AIBD Genetic Study Group

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520 |a 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 to 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. 
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