IgE Sensitization Profile in Patients with Netherton Syndrome.

ABSTRACT

BACKGROUND: Scant data are currently available on the allergen-specific immunoglobulin (Ig)E sensitization profile in primary immunodeficiencies with hyper IgE. Netherton syndrome (NS, OMIM 266500) is an extremely rare form of congenital ichthyosis characterized by congenital scaly erythroderma, hair abnormalities, and deregulated IgE reactivity associated with severe atopic manifestations. OBJECTIVE: The aim of this study was to evaluate the feasibility and reliability of a multiplex proteomic approach in the detection of specific IgE in NS. METHODS: Specific IgE was evaluated in 10 individuals with an established molecular diagnosis of NS using an allergenic molecules microarray (immuno-solid-phase allergen chip). RESULTS: Polireactivity to airway allergens, mainly house dust mites and olive tree pollen, and food allergens were observed in NS. Eighty per cent of patients were responsive to LTP or profilins. A clinical history suggestive of severe egg, milk, and fish allergy was confirmed by reactivity to the thermostable molecules Gal d 1, Bod 8, and parvalbumin Gad c 1, respectively. Latex reactivity was associated with Hev b 5 and 6 reactivity. Two distinct clusters of reactivity were observed after hierarchical analysis. Extremely high IgE levels (> 10,000 kU/L) do not affect the results obtained with microarrays. CONCLUSION: IgE multiplex evaluation allows (i) to profile IgE polyreactivity pictures, in the presence of LTP and profilin sensitization, (ii) to verify the clinical history of food allergy to milk, egg, and seafood, (iii) to confirm the allergic events associated with latex exposure, and (iv) to disclose the presence of preclinical sensitizations in patients affected by primary immunodeficiencies with hyper IgE, such as the NS.