Protein recoding by ADAR1-mediated RNA editing is not essential for normal development and homeostasis

Journal article

Heraud-Farlow, Jacki E., Chalk, Alistair M., Linder, Sandra, Li, Qin, Taylor, Scott, White, Joshua M., Pang, Lokman, Liddicoat, Brian J., Gupte, Ankita, Li, Jin Billy and Walkley, Carl. (2017). Protein recoding by ADAR1-mediated RNA editing is not essential for normal development and homeostasis. Genome Biology. 18(1), pp. 1 - 18. https://doi.org/10.1186/s13059-017-1301-4
AuthorsHeraud-Farlow, Jacki E., Chalk, Alistair M., Linder, Sandra, Li, Qin, Taylor, Scott, White, Joshua M., Pang, Lokman, Liddicoat, Brian J., Gupte, Ankita, Li, Jin Billy and Walkley, Carl
Abstract

Background
Adenosine-to-inosine (A-to-I) editing of dsRNA by ADAR proteins is a pervasive epitranscriptome feature. Tens of thousands of A-to-I editing events are defined in the mouse, yet the functional impact of most is unknown. Editing causing protein recoding is the essential function of ADAR2, but an essential role for recoding by ADAR1 has not been demonstrated. ADAR1 has been proposed to have editing-dependent and editing-independent functions. The relative contribution of these in vivo has not been clearly defined. A critical function of ADAR1 is editing of endogenous RNA to prevent activation of the dsRNA sensor MDA5 (Ifih1). Outside of this, how ADAR1 editing contributes to normal development and homeostasis is uncertain.
Results
We describe the consequences of ADAR1 editing deficiency on murine homeostasis. Adar1 E861A/E861A Ifih1 -/- mice are strikingly normal, including their lifespan. There is a mild, non-pathogenic innate immune activation signature in the Adar1 E861A/E861A Ifih1 -/- mice. Assessing A-to-I editing across adult tissues demonstrates that outside of the brain, ADAR1 performs the majority of editing and that ADAR2 cannot compensate in its absence. Direct comparison of the Adar1 -/- and Adar1 E861A/E861A alleles demonstrates a high degree of concordance on both Ifih1 +/+ and Ifih1 -/- backgrounds, suggesting no substantial contribution from ADAR1 editing-independent functions.
Conclusions
These analyses demonstrate that the lifetime absence of ADAR1-editing is well tolerated in the absence of MDA5. We conclude that protein recoding arising from ADAR1-mediated editing is not essential for organismal homeostasis. Additionally, the phenotypes associated with loss of ADAR1 are the result of RNA editing and MDA5-dependent functions.

KeywordsADAR1; RNA editing; MDA5; Development; dsRNA; Innate immunity; Epitranscriptome
Year2017
JournalGenome Biology
Journal citation18 (1), pp. 1 - 18
PublisherBioMed Central
ISSN1474-7596
Digital Object Identifier (DOI)https://doi.org/10.1186/s13059-017-1301-4
Scopus EID2-s2.0-85028945383
Open accessOpen access
Page range1 - 18
Research GroupMary MacKillop Institute for Health Research
Publisher's version
License
Place of publicationUnited Kingdom
EditorsB. Cheifet
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Knockdown of PTHR1 in osteosarcoma cells decreases invasion and growth and increases tumor differentiation in vivo
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