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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

NQO2 gene is associated with clozapine-induced agranulocytosis.

Clozapine is a dibenzodiazepine neuroleptic with atypical pharmacological and clinical profiles. Treatment with this drug may be complicated with agranulocytosis (AGR). It is likely that defective oxidative mechanism may be the cause of AGR. A candidate gene, dihydronicotinamide riboside (NRH) quinone oxidoreductase 2 (NQO2), which is involved in detoxification of drugs, was selected. This gene has been mapped to the short arm of chromosome six. The gene was studied by single-strand conformation polymorphism analysis and direct sequencing in 98 schizophrenic patients that were treated with clozapine. Eighteen of these patients developed AGR. Ten polymorphisms in the coding regions, in intron 1, and in the promoter region were found, two of which were novel. Comparisons of the polymorphisms in the first intron in AGR patients and controls suggested that this site might be connected with AGR. Quantitative reverse transcriptase-polymerase chain reaction analysis showed that the level of NQO2 mRNA is low in AGR patients compared with the control group. Such a reduction in message suggests that the NQO2 gene may be involved in the development of clozapine-induced AGR.[1]


  1. NQO2 gene is associated with clozapine-induced agranulocytosis. Ostrousky, O., Meged, S., Loewenthal, R., Valevski, A., Weizman, A., Carp, H., Gazit, E. Tissue Antigens (2003) [Pubmed]
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