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Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Immunity 2015 ; 43 (5): 933-44 Nephropedia Template TP
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Isoforms of the RNA editing enzyme ADAR1 independently control nucleic acid sensor MDA5-driven autoimmunity and multi-organ development #MMPMID26588779
Immunity 2015[Nov]; 43 (5): 933-44 PMID26588779show ga
Mutations in the ADAR gene that encodes the ADAR1 RNA editing enzyme cause Aicardi-Goutières Syndrome (AGS), a severe autoimmune disease associated with an aberrant type I interferon response. How ADAR1 prevents autoimmunity remains incompletely defined. Here, we demonstrate that ADAR1 is a specific and essential negative regulator of the MDA5-MAVS RNA sensing pathway. Moreover, we uncovered a MDA5-MAVS-independent function for ADAR1 in the development of multiple organs. We showed that the p150 isoform of ADAR1 uniquely regulated the MDA5 pathway, whereas both the p150 and p110 isoforms contributed to development. Abrupt deletion of ADAR1 in adult mice revealed that both of these functions were required throughout life. Our findings delineate genetically separable roles for both ADAR1 isoforms in vivo, with implications for the human diseases caused by ADAR mutations.