Retrotransposable genetic elements causing neutrophil defects

European Journal of Clinical Investigation
Dirk Roos, Martin de Boer

Abstract

Retrotransposable elements are stretches of DNA that encode proteins with the inherent ability to insert their own RNA or another RNA by reverse transcriptase as DNA into a new genomic location. In humans, the only autonomous retrotransposable elements are members of the Long INterspersed Element-1 (LINE-1) family. LINE-1s may cause gene inactivation and human disease. We present a brief summary of the published knowledge about LINE-1s in humans and the RNAs that these elements can transpose, and we focus on the effect of LINE-1-mediated retrotransposition on human neutrophil function. Retrotransposons can cause genetic disease by two primary mechanisms: (1) insertional mutagenesis and (2) nonallelic homologous recombination. The only known neutrophil function affected by retrotransposition is that of NADPH oxidase activity. Four patients with chronic granulomatous disease (CGD) are known with LINE-1-mediated insertional inactivation of CYBB, the gene that encodes the gp91phox component of the phagocyte NADPH oxidase. In addition, 5 CGD patients had a large deletion in the NCF2 gene, encoding the p67phox component, and 2 CGD patients had a similar deletion in NCF1, encoding p47phox . These deletions were caused by nonallelic ho...Continue Reading

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