Abstract
Adenosine-to-inosine (A-to-I) RNA editing mediated by the ADAR (adenosine deaminase acting on RNA) protein family is the primary type of epitranscriptomic modification known to occur in mammal cells. Recently, several technologies have been developed to re-target this RNA modification to desired locations within specific transcripts. This possibility opened a scenario in which targeted RNA-base editing tools can be used as therapeutic strategies to correct mutations at the RNA level. The chapter will go into detail about the therapeutic potentials of these different RNA base-editing technologies, after providing a brief overview of the roles and functions of ADAR family members. The chapter aims to review the recent advancements of targeted RNA-base editing methodologies and their translation to therapeutic settings. We will discuss strategies leveraging exogenous and endogenous ADAR to create a wholesome perspective on the potential of this molecular mechanism as a tool to correct disease-causing G-to-A point mutations. In this context, clinically relevant approaches and their potential future applications, as well as their currently challenging limitations, will be evaluated.
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Abbreviations
- A:
-
Adenosine
- A1AT:
-
α1-antitrypsin
- AAV:
-
Adeno-associated virus
- AAV8:
-
Adeno-associated virus vector 8
- ADAR:
-
Adenosine deaminase acting on RNA
- ADAR2DD:
-
Deamination domain of ADAR2
- ADAR2E488Q:
-
Hyperactive ADAR2 mutant carrying the E488Q mutation
- ADAT:
-
Adenosine deaminase acting on tRNAs
- adRNA or AD-gRNA:
-
ADAR guiding RNA
- adV:
-
Adenovirus
- ALS:
-
Amyotrophic lateral sclerosis
- arRNA:
-
ADAR recruiting RNA
- ASOs:
-
Antisense oligonucleotides
- A-to-C:
-
Adenosine to cytosine
- A-to-I:
-
Adenosine to inosine
- BG:
-
O6-benzylguanine
- C:
-
Cytosine
- CDA:
-
Cytidine deaminase acting on mononucleotides
- CFTR:
-
Cystic fibrosis transmembrane conductance regulator
- CIRTS:
-
CRISPR-Cas-inspired RNA targeting system
- CNS:
-
Central nervous system
- dCas13b:
-
Catalytically inactive mutant of PspCas13b protein
- DMD:
-
Duchenne muscular dystrophy
- dsRBD:
-
Double-stranded RNA-binding domain
- dsRBM:
-
Double-stranded RNA-binding motif
- dsRNA:
-
Double-stranded RNA
- eCFP:
-
Enhanced cyan fluorescent protein
- eGFP:
-
Enhanced green fluorescent protein
- EONs:
-
Editing oligonucleotides
- G:
-
Guanosine
- GluR2:
-
Glutamate ionotropic receptor
- gRNA:
-
Guide RNA
- G-to-A:
-
Guanosine to adenosine
- HEK:
-
Human embryonic kidney
- HeLa cells:
-
Henrietta Lacks cervical cancer cells
- HEPN:
-
Higher-eukaryotes and prokaryotes nucleotide binding domain
- I:
-
Inosine
- IDUA:
-
α-L-iduronidase
- IFN:
-
Interferon
- IFN-I type :
-
Interferon type I
- irCLASH:
-
Infrared-dye-conjugated and biotinylated ligation adapter-based CLASH protocol (Crosslinking, Ligation And Sequencing of Hybrids)
- ISGs:
-
Interferon stimulated genes
- IV:
-
Intravenous
- IVT:
-
Intravitreal
- LEAPER:
-
Leveraging endogenous ADAR for programmable editing of RNA
- LINEs:
-
Long interspersed elements
- MAVS:
-
Mitochondrial antiviral signalling protein
- MCP:
-
MS2 coat protein
- MDA5:
-
Melanoma differentiation-associated protein 5
- MECP2:
-
Methyl CpG binding protein 2
- MEF:
-
Mouse embryonic fibroblasts
- MPS I:
-
Mucopolysaccharidosis type I
- NES:
-
Nuclear export signal
- NLS:
-
Nuclear localisation signal
- OTC:
-
Ornithine transcarbamylase
- PKR:
-
Protein kinase R
- PRRs:
-
Pattern recognition receptors
- Q/R site:
-
Glutamine (Q) to arginine (R) site
- R/G motif:
-
Arginine (R) to glycine (G) motif
- REPAIR:
-
RNA Editing for Programmable A to I Replacement
- RESCUE:
-
RNA Editing for Specific C-to-U Exchange
- RESTORE:
-
Recruiting Endogenous ADAR to Specific Transcripts for Oligonucleotide-mediated RNA Editing
- RIG-I:
-
Retinoid acid-inducible gene I
- RLR:
-
RIG-I like receptor
- RTT:
-
Rett syndrome
- ssRNA:
-
Single-stranded RNA
- TALENs:
-
Transcription activator-like effector nucleases
- tRNA:
-
Transfer RNA
- U:
-
Uracil
- UTRs:
-
Untranslated regions
- ZFNs:
-
Zinc finger nucleases
- λN:
-
λ-phage N protein
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Casati, B., Stamkopoulou, D., Tasakis, R.N., Pecori, R. (2021). ADAR-Mediated RNA Editing and Its Therapeutic Potentials. In: Jurga, S., Barciszewski, J. (eds) Epitranscriptomics. RNA Technologies, vol 12. Springer, Cham. https://doi.org/10.1007/978-3-030-71612-7_18
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