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2015 ; 43
(5
): 933-44
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Isoforms of RNA-Editing Enzyme ADAR1 Independently Control Nucleic Acid Sensor
MDA5-Driven Autoimmunity and Multi-organ Development
#MMPMID26588779
Pestal K
; Funk CC
; Snyder JM
; Price ND
; Treuting PM
; Stetson DB
Immunity
2015[Nov]; 43
(5
): 933-44
PMID26588779
show ga
Mutations in ADAR, which 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.
|Adaptor Proteins, Signal Transducing/metabolism
[MESH]
|Adenosine Deaminase/*metabolism
[MESH]
|Animals
[MESH]
|Autoimmune Diseases of the Nervous System/metabolism
[MESH]