Oct 23, 2019

Genome-wide quantification of ADAR adenosine-to-inosine RNA editing activity

Nature Methods
Shalom Hillel RothEli Eisenberg


Adenosine-to-inosine (A-to-I) RNA editing by the adenosine deaminase that acts on RNA (ADAR) enzymes is a common RNA modification, preventing false activation of the innate immune system by endogenous double-stranded RNAs. Methods for quantification of ADAR activity are sought after, due to an increasing interest in the role of ADARs in cancer and autoimmune disorders, as well as attempts to harness the ADAR enzymes for RNA engineering. Here, we present the Alu editing index (AEI), a robust and simple-to-use computational tool devised for this purpose. We describe its properties and demonstrate its superiority to current quantification methods of ADAR activity. The AEI is used to map global editing across a large dataset of healthy human samples and identify putative regulators of ADAR, as well as previously unknown factors affecting the observed Alu editing levels. These should be taken into account in future comparative studies of ADAR activity. The AEI tool is available at https://github.com/a2iEditing/RNAEditingIndexer.

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Mentioned in this Paper

Genome-Wide Association Study
RNA, Double-Stranded
Autoimmune Diseases
Malignant Neoplasms
Tissue Engineering
Adar protein, Drosophila
Comparative Study Research
DNA Sequence

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