The majority of A-to-I RNA editing is not required for mammalian homeostasis

Journal article


Chalk, Alistair M., Taylor, Scott, Heraud-Farlow, Jacki E. and Walkley, Carl. (2019). The majority of A-to-I RNA editing is not required for mammalian homeostasis. Genome Biology. 20, pp. 1 - 14. https://doi.org/10.1186/s13059-019-1873-2
AuthorsChalk, Alistair M., Taylor, Scott, Heraud-Farlow, Jacki E. and Walkley, Carl
Abstract

Background Adenosine-to-inosine (A-to-I) RNA editing, mediated by ADAR1 and ADAR2, occurs at tens of thousands to millions of sites across mammalian transcriptomes. A-to-I editing can change the protein coding potential of a transcript and alter RNA splicing, miRNA biology, RNA secondary structure and formation of other RNA species. In vivo, the editing-dependent protein recoding of GRIA2 is the essential function of ADAR2, while ADAR1 editing prevents innate immune sensing of endogenous RNAs by MDA5 in both human and mouse. However, a significant proportion of A-to-I editing sites can be edited by both ADAR1 and ADAR2, particularly within the brain where both are highly expressed. The physiological function(s) of these shared sites, including those evolutionarily conserved, is largely unknown. Results To generate completely A-to-I editing-deficient mammals, we crossed the viable rescued ADAR1-editing-deficient animals (Adar1E861A/E861AIfih1−/−) with rescued ADAR2-deficient (Adarb1−/−Gria2R/R) animals. Unexpectedly, the global absence of editing was well tolerated. Adar1E861A/E861AIfih1−/−Adarb1−/−Gria2R/R were recovered at Mendelian ratios and age normally. Detailed transcriptome analysis demonstrated that editing was absent in the brains of the compound mutants and that ADAR1 and ADAR2 have similar editing site preferences and patterns. Conclusions We conclude that ADAR1 and ADAR2 are non-redundant and do not compensate for each other’s essential functions in vivo. Physiologically essential A-to-I editing comprises a small subset of the editome, and the majority of editing is dispensable for mammalian homeostasis. Moreover, in vivo biologically essential protein recoding mediated by A-to-I editing is an exception in mammals.

KeywordsA-to-I editing; ADAR1; ADAR2; RNA editing; Epitranscriptome; RNA modification
Year2019
JournalGenome Biology
Journal citation20, pp. 1 - 14
PublisherBiomed Central Ltd
ISSN1474-760X
Digital Object Identifier (DOI)https://doi.org/10.1186/s13059-019-1873-2
Scopus EID2-s2.0-85076300664
Open accessOpen access
Page range1 - 14
Research GroupMary MacKillop Institute for Health Research
Publisher's version
License
Place of publicationUnited Kingdom
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Ho, P. W. M., Goradia, A., Russell, M. R., Chalk, Alistair M., Milley, K. M., Baker, E. K., Danks, J. A., Slavin, John, Walia, Mannu K., Crimeen-Irwin, B., Dickins, R. A., Martin, T. John and Walkley, Carl. (2015). Knockdown of PTHR1 in osteosarcoma cells decreases invasion and growth and increases tumor differentiation in vivo. Oncogene. 34(22), pp. 2922 - 2933. https://doi.org/10.1038/onc.2014.217
RARγ is a negative regulator of osteoclastogenesis
Green, Alanna C., Poulton, Ingrid J., Vrahnas, Christina, Häusler, Karl D., Walkley, Carl, Wu, Joy Y., Martin, T. John, Gillespie, Matthew T., Chandraratna, Roshantha A. S., Quinn, Julian M. W., Sims, Natalie A. and Purton, L. E.. (2015). RARγ is a negative regulator of osteoclastogenesis. The Journal of Steroid Biochemistry and Molecular Biology. 150, pp. 46 - 53. https://doi.org/10.1016/j.jsbmb.2015.03.005
Brief report: The differential roles of mTORC1 and mTORC2 in mesenchymal stem cell differentiation
Martin, Sally K., Fitter, Stephen, Dutta, Ankit K., Matthews, Mary P., Walkley, Carl, Hall, Michael N., Ruegg, Markus A., Gronthos, Stan and Zannettino, Andrew C. W.. (2015). Brief report: The differential roles of mTORC1 and mTORC2 in mesenchymal stem cell differentiation. Stem Cells. 33(4), pp. 1359 - 1365. https://doi.org/10.1002/stem.1931
Ciliary neurotrophic factor has intrinsic and extrinsic roles in regulating B cell differentiation and bone structure
Askmyr, Maria, White, Kirby E., Jovic, Tanja, King, Hannah A., Quach, Julie M., Maluenda, Ana C., Baker, E. K., Smeets, Monique F., Walkley, Carl and Purton, L. E.. (2015). Ciliary neurotrophic factor has intrinsic and extrinsic roles in regulating B cell differentiation and bone structure. Scientific Reports. 5, pp. 1 - 13. https://doi.org/10.1038/srep15529
PTHrP, its receptor, and protein kinase A activation in osteosarcoma
Walkley, Carl, Walia, Mannu K., Ho, P.W.M. and Martin, T. J.. (2014). PTHrP, its receptor, and protein kinase A activation in osteosarcoma. Molecular & Cellular Oncology. 1(4), pp. 1 - 3. https://doi.org/10.4161/23723548.2014.965624
Gene expression profiling to define the cell intrinsic role of the SKI proto-oncogene in hematopoiesis and myeloid neoplsms
Chalk, Alistair M., Liddicoat, Brian J., Walkley, Carl and Singbrant, Sofie. (2014). Gene expression profiling to define the cell intrinsic role of the SKI proto-oncogene in hematopoiesis and myeloid neoplsms. Genomics Data. 2, pp. 189 - 191. https://doi.org/10.1016/j.gdata.2014.06.022
The SKI proto-oncogene enhances the in vivo repopulation of hematopoietic stem cells and causes myeloproliferative disease
Singbrant, Sofie, Wall, Meaghan, Moody, Jennifer, Karlsson, Göran, Chalk, Alistair M., Liddicoat, Brian J., Russell, Megan R., Walkley, Carl R. and Karlsson, Stefan. (2014). The SKI proto-oncogene enhances the in vivo repopulation of hematopoietic stem cells and causes myeloproliferative disease. Haematologica. 99(4), pp. 647 - 655. https://doi.org/10.3324/haematol.2013.093971
The Rothmund-Thomson syndrome helicase RECQL4 is essential for hematopoiesis
Smeets, Monique F., DeLuca, Elisabetta, Wall, Meaghan, Quach, Julie M., Chalk, Alistair M., Deans, Andrew J., Heierhorst, Jörg, Purton, Louise E., Izon, David J. and Walkley, Carl R.. (2014). The Rothmund-Thomson syndrome helicase RECQL4 is essential for hematopoiesis. Journal of Clinical Investigation. 124(8), pp. 3551 - 3565. https://doi.org/10.1172/JCI75334
Cells of origin in osteosarcoma: Mesenchymal stem cells or osteoblast committed cells?
Mutsaers, Anthony J. and Walkley, Carl R.. (2014). Cells of origin in osteosarcoma: Mesenchymal stem cells or osteoblast committed cells? Bone. 62, pp. 56 - 63. https://doi.org/10.1016/j.bone.2014.02.003
Immune response to rb1-regulated senescence limits radiation-Induced osteosarcoma formation
Kansara, Maya, Leong, Huei San, Lin, Dan Mei, Popkiss, Sophie, Pang, Puiyi, Garsed, Dale W., Walkley, Carl R., Cullinane, Carleen, Ellul, Jason, Haynes, Nicole M., Hicks, Rod, Kuijjer, Marieke L., Cleton-Jansen, Anne-Marie, Hinds, Philip W., Smyth, Mark J. and Thomas, David M.. (2013). Immune response to rb1-regulated senescence limits radiation-Induced osteosarcoma formation. Journal of Clinical Investigation. 123(12), pp. 5351 - 5360. https://doi.org/10.1172/JCI70559
Erythroid-extrinsic regulation of normal erythropoiesis by retinoic acid receptors
Dewamitta, Sita R., Joseph, Chacko, Purton, Louise E. and Walkley, Carl R.. (2013). Erythroid-extrinsic regulation of normal erythropoiesis by retinoic acid receptors. British Journal of Haematology. 164(2), pp. 280 - 285. https://doi.org/10.1111/bjh.12578
Modeling distinct osteosarcoma subtypes in vivo using Cre: Lox and lineage-restricted transgenic shRNA
Mutsaers, Anthony J., Ng, Alvin J. M., Baker, Emma K., Russell, Megan R., Chalk, Alistair M., Wall, Meaghan, Liddicoat, Brian J. J., Ho, Patricia W. M., Slavin, John L., Goradia, Ankita, Martin, T. John, Purton, Louise E., Dickins, Ross A. and Walkley, Carl R.. (2013). Modeling distinct osteosarcoma subtypes in vivo using Cre: Lox and lineage-restricted transgenic shRNA. Bone. 55(1), pp. 166 - 178. https://doi.org/10.1016/j.bone.2013.02.016
Darbepoietin-alfa has comparable erythropoietic stimulatory effects to recombinant erythropoietin whilst preserving the bone marrow microenvironment
Dewamitta, Sita R., Russell, Megan R., Nandurkar, Harshal and Walkley, Carl R.. (2013). Darbepoietin-alfa has comparable erythropoietic stimulatory effects to recombinant erythropoietin whilst preserving the bone marrow microenvironment. Haematologica. 98(5), pp. 686 - 690. https://doi.org/10.3324/haematol.2012.078709
Deciphering hematopoietic stem cells in their niches: A critical appraisal of genetic models, lineage tracing, and imaging strategies
Joseph, Chacko, Quach, Julie M., Walkley, Carl R., Lane, Steven W., Celso, Cristina Lo and Purton, Louise E.. (2013). Deciphering hematopoietic stem cells in their niches: A critical appraisal of genetic models, lineage tracing, and imaging strategies. Cell Stem Cell. 13(5), pp. 520 - 533. https://doi.org/10.1016/j.stem.2013.10.010
The zinc-finger protein ASCIZ regulates B cell development via DYNLL1 and Bim
Jurado, Sabine, Gleeson, Kimberly, O’Donnell, Kristy, Izon, David J., Walkley, Carl R., Strasser, Andreas, Tarlinton, David M. and Heierhorst, Jörg. (2012). The zinc-finger protein ASCIZ regulates B cell development via DYNLL1 and Bim. Journal of Experimental Medicine. 209(9), pp. 1629-1639. https://doi.org/10.1084/jem.20120785
Fak depletion in both hematopoietic and nonhematopoietic niche cells leads to hematopoietic stem cell expansion
Lu, Jiayun, Sun, Yan, Nombela-Arrieta, Cesar, Du, Karrie P., Park, Shin-Young, Chai, Li, Walkley, Carl, Luo, Hongbo R. and Silberstein, Leslie E.. (2012). Fak depletion in both hematopoietic and nonhematopoietic niche cells leads to hematopoietic stem cell expansion. Experimental Hematology. 40(4), pp. 307-317. https://doi.org/10.1016/j.exphem.2011.11.010
Erythropoietin couples erythropoiesis, B-lymphopoiesis, and bone homeostasis within the bone marrow microenvironment
Singbrant, Sofie, Russell, Megan R., Jovic, Tanja, Liddicoat, Brian, Izon, David J., Purton, Louise E., Sims, Natalie A., Martin, T. John, Sankaran, Vijay G. and Walkley, Carl R.. (2011). Erythropoietin couples erythropoiesis, B-lymphopoiesis, and bone homeostasis within the bone marrow microenvironment. Blood. 117(21), pp. 5631-5642. https://doi.org/10.1182/blood-2010-11-320564
Erythropoiesis, anemia and the bone marrow microenvironment
Walkley, Carl R.. (2011). Erythropoiesis, anemia and the bone marrow microenvironment. International Journal of Hematology. 93, pp. 10-13. https://doi.org/10.1007/s12185-010-0759-6
Defining the hematopoietic stem cell niche : The chicken and the egg conundrum
Singbrant, Sofie, Askmyr, Maria, Purton, Louise E. and Walkley, Carl R.. (2011). Defining the hematopoietic stem cell niche : The chicken and the egg conundrum. Journal of Cellular Biochemistry. 112(6), pp. 1486-1490. https://doi.org/10.1002/jcb.23085
Hematopoietic AMPK beta1 reduces mouse adipose tissue macrophage inflammation and insulin resistance in obesity
Galic, Sandra, Fullerton, Morgan, Schertzer, Jonathan, Sikkema, Sarah, Marcinko, Katarina, Walkley, Carl, Izon, David, Honeyman, Jane, Chen, Zhi-Ping, Van Denderen, Bryce, Kemp, Bruce and Steinberg, Gregory. (2011). Hematopoietic AMPK beta1 reduces mouse adipose tissue macrophage inflammation and insulin resistance in obesity. Journal of Clinical Investigation. 121(12), pp. 4903 - 4915. https://doi.org/10.1172/JCI58577
Hematopoietic AMPK Beta ß1 reduces mouse adipose tissue macrophage inflammation and insulin resistance in obesity
Galic, Sandra, Fullerton, Morgan D., Schertzer, Jonathan D., Sikkema, Sarah, Marcinko, Katarina, Walkley, Carl R., Izon, David, Honeyman, Jane, Chen, Zhi-Ping, van Denderen, Bryce J., Kemp, Bruce Ernest and Steinberg, Gregory R.. (2011). Hematopoietic AMPK Beta ß1 reduces mouse adipose tissue macrophage inflammation and insulin resistance in obesity. Journal of Clinical Investigation. 121(12), pp. 4903 - 4915. https://doi.org/10.1172/JCI58577