Recurrent Aphthous Stomatitis (RAS) is a common oral inflammatory disease with unknown pathogenesis. Although the immune system alterations could be involved in predisposition of individuals to oral candidiasis, precise etiologies of RAS have not been understood yet. A recent study showed that autosomal dominant IL17F deficiency could cause chronic mucocutaneous candidiasis. Considering the inflammatory nature of interleukin (IL)-17F and RAS, this study was performed to check any disease-associated mutation in a number of patients with RAS. Sixty-two Iranian individuals with RAS were investigated in this study. After DNA extraction using a phenol-chloroform method from the whole blood, amplification was accomplished by polymerase chain reaction and the products were sequenced using a 3730 ABI sequencer. The results of sequencing revealed a missense, heterozygous mutation of IL17F, converting a threonine to proline in a patient with RAS (T79P). The Poly-phen software suggested a damaging probability predicting this substitution to have a harmful effect on IL-17F protein function. This mutation was checked in fifty healthy individuals, and was not detected in any of them. This is the first study showing that a mutation in IL-17F is associated with susceptibility to RAS. However, functional studies and further studies on more patients with RAS are required to confirm such association.
Gene – Elsevier
Published: May 15, 2018
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