Filaggrin gene polymorphisms in Iranian ichthyosis vulgaris and atopic dermatitis patients.

Abstract

Filaggrin is a key structural epidermal protein in terminal differentiation and formation of skin barrier. The important role of filaggrin and its effects in various cutaneous and noncutaneous disorders initiated a cascade of considerable research in recent years. Loss-of-function mutations in FLG, the human gene encoding profilaggrin/filaggrin, is the cause of the common skin condition ichthyosis vulgaris (IV) and major genetic predisposing factor for atopic dermatitis (AD). Several null mutations in the FLG gene that lead to a decrease or absence of filaggrin in skin and predispose these conditions have been described. The aim of this study was to investigative genetic polymorphism of FLG in Iranian patients with IV and AD. In the current study, we carried out full sequencing of the entire FLG coding region in 30 IV patients and 30 AD patients, and also 60 healthy controls. In our research, we identified 43 variants reported previously and two novel variants. In our study, in the AD and IV patients, loss-of-function FLG mutation was not found. This means that another mechanism other than FLG nonsense mutation is involved in the pathogenesis of these patients.