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  • 1. Ali, Magdi M. M.
    et al.
    Elghazali, Gehad
    Montgomery, Scott M.
    Farouk, Salah E.
    Nasr, Amre
    Noori, Suzan I. A.
    Shamad, Mahdi M.
    Fadlelseed, Omar E.
    Berzins, Klavs
    Stockholm University, Faculty of Science, The Wenner-Gren Institute.
    Fc{gamma}RIIa (CD32) Polymorphism and Onchocercal Skin Disease: Implications for the Development of Severe Reactive Onchodermatitis (ROD)2007In: American Journal of Tropical Medicine and Hygiene, ISSN 0002-9637, E-ISSN 1476-1645, Vol. 77, no 6, p. 1074-1078Article in journal (Refereed)
    Abstract [en]

    The pathologic manifestations of Onchocerca volvulus infection depend on the interplay between the host and the parasite. A genetic single nucleotide polymorphism in the Fc gamma RIIa gene, resulting in arginine (R) or histidine (H) at position 131, affects the binding to the different IgG subclasses and may influence the clinical variations seen in onchocerciasis. This study investigated the relationship between this polymorphism and disease outcome. Fc gamma RIIa genotyping was performed on clinically characterized onchocerciasis patients (N = 100) and healthy controls (N = 74). Fc gamma RIIa genotype R/R131 frequencies were significantly higher among patients with severe dermatopathology (P < 0.001). Increased risk of developing this form was mostly associated with one tribe (Masalit) (OR = 3.2, 95% CI 1-9.9, P = 0.042). The H131 allele was found to be significantly associated with a reduced risk of having the severe form of the disease (adjusted OR = 0.26, 95% CI = 0.13-0.46, P < 0.001). Our findings suggest that the polymorphism influences the clinical outcome of onchocerciasis.

  • 2.
    Ali, Magdi Mahmoud
    et al.
    Stockholm University, Faculty of Science, The Wenner-Gren Institute .
    Montgomery, Scott M.
    Farouk, Salah E.
    Noori, Suzan I. A.
    Shamad, Mahdi M.
    Tayeb, Omer
    ElGhazali, Gehad
    Berzins, Klavs
    Stockholm University, Faculty of Science, The Wenner-Gren Institute .
    FcγRIIa (CD32) polymorphism and onchocercal skin disease: implications for the development of severe reactive onchodermatitis (ROD)2007In: American Journal of Tropical Medicine and Hygiene, ISSN 0002-9637, E-ISSN 1476-1645, Vol. 77, no 6, p. 1074-1078Article in journal (Refereed)
    Abstract [en]

    The pathologic manifestations of Onchocerca volvulus infection depend on the interplay between the host and the parasite. A genetic single nucleotide polymorphism in the FcγRIIa gene, resulting in arginine (R) or histidine (H) at position 131, affects the binding to the different IgG subclasses and may influence the clinical variations seen in onchocerciasis. This study investigated the relationship between this polymorphism and disease outcome. FcγRIIa genotyping was performed on clinically characterized onchocerciasis patients (N = 100) and healthy controls (N = 74). FcγRIIa genotype R/R131 frequencies were significantly higher among patients with severe dermatopathology (P < 0.001). Increased risk of developing this form was mostly associated with one tribe (Masalit) (OR = 3.2, 95% CI 1-9.9, P = 0.042). The H131 allele was found to be significantly associated with a reduced risk of having the severe form of the disease (adjusted OR = 0.26, 95% CI = 0.13-0.46, P < 0.001). Our findings suggest that the polymorphism influences the clinical outcome of onchocerciasis.

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