Mutations in ADAR1 cause Aicardi-Goutières syndrome associated with a type I interferon signature.

Nat Genet 2012 Nov 23;44(11):1243-8. Epub 2012 Sep 23.

Manchester Academic Health Science Centre, University of Manchester, Genetic Medicine, UK.

Adenosine deaminases acting on RNA (ADARs) catalyze the hydrolytic deamination of adenosine to inosine in double-stranded RNA (dsRNA) and thereby potentially alter the information content and structure of cellular RNAs. Notably, although the overwhelming majority of such editing events occur in transcripts derived from Alu repeat elements, the biological function of non-coding RNA editing remains uncertain. Here, we show that mutations in ADAR1 (also known as ADAR) cause the autoimmune disorder Aicardi-Goutières syndrome (AGS). As in Adar1-null mice, the human disease state is associated with upregulation of interferon-stimulated genes, indicating a possible role for ADAR1 as a suppressor of type I interferon signaling. Considering recent insights derived from the study of other AGS-related proteins, we speculate that ADAR1 may limit the cytoplasmic accumulation of the dsRNA generated from genomic repetitive elements.

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http://dx.doi.org/10.1038/ng.2414DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4154508PMC
November 2012
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