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Chronic granulomatous disease (CGD) is a rare congenital syndrome that results in severe, recurrent bacterial and fungal infections. The most common form is caused by defects in the CYBB gene, leading to the absence of gp91phox associated with totally abolished NADPH oxidase activity (X91(0) CGD). We report 3 brothers with atypical cases of X-linked CGD, characterized by low levels of expression of gp91phox (X91(-) CGD). A point mutation (T-55C) identified in the CYBB gene's promoter region appears to prevent the full expression of this gene in neutrophils. This results in low levels of expression of gp91phox protein that are correlated with residual oxidase activity in the whole population of neutrophils. The total O(2)(-) production in these cells was approximately 5% of normal. Despite this oxidase activity, the patients experienced severe and life-threatening infections. It was concluded that the O(2)(-) production in the neutrophils of these patients was not sufficient to protect them against infections, and this X91(-) CGD phenotype must be considered to be a severe clinical form of CGD.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Severe Clinical Forms of Cytochromeb–Negative Chronic Granulomatous Disease (X91−) in 3 Brothers with a Point Mutation in the Promoter Region ofCYBB