Abstract
In recent years, RNA has emerged as a medium with a broad spectrum of therapeutic potential, however, for years, a group of short RNA fragments was studied and considered therapeutic molecules. In nature, RNA plays both functions, with coding and non-coding potential. For RNA, like any other therapeutic, to be used clinically, certain barriers must be crossed. Among them, there are biocompatibility, relatively low toxicity, bioavailability, increased stability, target efficiency and low off-target effects. In the case of RNA, most of these obstacles can be overcome by incorporating modified nucleotides into its structure. This may be achieved by both, in vitro and in vivo biosynthetic methods, as well as chemical synthesis. Some advantages and disadvantages of each approach are summarized here. The wide range of nucleotide analogues has been tested for their utility as monomers for RNA synthesis. Many of them have been successfully implemented, and a lot of pre-clinical and clinical studies involving modified RNA have been carried out. Some of these medications have already been introduced into clinics. After the huge success of RNA-based vaccines that were introduced into widespread use in 2020, and the introduction to the market of some RNA-based drugs, RNA therapeutics containing modified nucleotides appear to be the future of medicine.
Keywords: Synthetic RNA, modified nucleotides, RNA chemical synthesis, therapeutic RNA, in vitro RNA synthesis, enzymatic synthesis.
[http://dx.doi.org/10.1073/pnas.83.24.9373] [PMID: 2432595]
[http://dx.doi.org/10.1021/bi9607214] [PMID: 8679609]
[http://dx.doi.org/10.1021/ja01595a086]
[http://dx.doi.org/10.1073/pnas.46.8.1044] [PMID: 16590711]
[http://dx.doi.org/10.1126/science.147.3664.1462] [PMID: 14263761]
[http://dx.doi.org/10.2174/0929867329666220322104552] [PMID: 35319356]
[http://dx.doi.org/10.1073/pnas.0704138104] [PMID: 17670940]
[http://dx.doi.org/10.1107/S0365110X59000160]
[http://dx.doi.org/10.1016/S1074-5521(00)80003-4] [PMID: 10631510]
[http://dx.doi.org/10.1017/S0033583506004215] [PMID: 16817983]
[http://dx.doi.org/10.1007/s000180050042] [PMID: 10892344]
[http://dx.doi.org/10.1021/ar200098t] [PMID: 21899297]
[http://dx.doi.org/10.1021/ar50119a004]
[http://dx.doi.org/10.1038/s41580-021-00342-0] [PMID: 33658722]
[http://dx.doi.org/10.1038/288669a0] [PMID: 7005687]
[http://dx.doi.org/10.1080/15476286.2018.1478942] [PMID: 30099966]
[http://dx.doi.org/10.1038/418229a] [PMID: 12110899]
[http://dx.doi.org/10.1007/s13238-010-0107-x] [PMID: 21113408]
[http://dx.doi.org/10.1007/s11033-016-3954-6] [PMID: 26892782]
[http://dx.doi.org/10.1038/nature11247] [PMID: 22955616]
[http://dx.doi.org/10.1038/s41556-019-0311-8] [PMID: 31048766]
[http://dx.doi.org/10.1038/s41580-020-00315-9] [PMID: 33353982]
[http://dx.doi.org/10.1093/nar/gky960] [PMID: 30329098]
[http://dx.doi.org/10.1126/science.1112014] [PMID: 16141072]
[http://dx.doi.org/10.1101/gr.4200206] [PMID: 16344565]
[http://dx.doi.org/10.3390/ijms140714744] [PMID: 23860209]
[http://dx.doi.org/10.1038/nrm2124] [PMID: 17318225]
[http://dx.doi.org/10.1016/0092-8674(93)90530-4] [PMID: 8252622]
[http://dx.doi.org/10.1038/35888] [PMID: 9486653]
[http://dx.doi.org/10.1016/j.addr.2015.05.001] [PMID: 25979468]
[http://dx.doi.org/10.1002/dvdy.24548] [PMID: 28691356]
[http://dx.doi.org/10.1007/978-3-642-36853-0]
[http://dx.doi.org/10.1016/j.cell.2009.01.035] [PMID: 19239886]
[http://dx.doi.org/10.1101/gad.1284105] [PMID: 15741316]
[http://dx.doi.org/10.1038/s41576-018-0073-3] [PMID: 30446728]
[http://dx.doi.org/10.1016/j.molcel.2007.05.021] [PMID: 17560367]
[http://dx.doi.org/10.1007/978-94-007-4954-2_7] [PMID: 23076582]
[http://dx.doi.org/10.1126/science.281.5377.660] [PMID: 9685251]
[http://dx.doi.org/10.1186/s12934-016-0437-3] [PMID: 26861699]
[http://dx.doi.org/10.3389/fmicb.2014.00172] [PMID: 24860555]
[http://dx.doi.org/10.1093/nar/16.16.8095] [PMID: 3419903]
[http://dx.doi.org/10.1016/S0076-6879(88)64041-9] [PMID: 3071660]
[http://dx.doi.org/10.1016/0022-2836(88)90524-4] [PMID: 2459391]
[http://dx.doi.org/10.1038/nmeth1058] [PMID: 17558412]
[http://dx.doi.org/10.1038/nprot.2009.67] [PMID: 19478810]
[http://dx.doi.org/10.1002/jmr.917] [PMID: 19195013]
[http://dx.doi.org/10.1017/S135583820100245X] [PMID: 11345441]
[http://dx.doi.org/10.1021/acssynbio.7b00237] [PMID: 29513000]
[http://dx.doi.org/10.1073/pnas.96.11.6131] [PMID: 10339553]
[http://dx.doi.org/10.1017/S1355838299990945] [PMID: 10496226]
[http://dx.doi.org/10.1007/978-1-62703-113-4_7] [PMID: 23065555]
[http://dx.doi.org/10.1073/pnas.93.11.5572] [PMID: 8643617]
[http://dx.doi.org/10.1017/S1355838200000947] [PMID: 11073216]
[http://dx.doi.org/10.1007/s10858-009-9375-2] [PMID: 19789981]
[http://dx.doi.org/10.1093/nar/gks292] [PMID: 22457065]
[http://dx.doi.org/10.1016/j.jbiotec.2008.12.012] [PMID: 19138712]
[http://dx.doi.org/10.1093/nar/gkv045] [PMID: 25662225]
[http://dx.doi.org/10.1080/15476286.2017.1317911] [PMID: 28402213]
[http://dx.doi.org/10.1016/bs.mie.2016.02.018] [PMID: 27241756]
[http://dx.doi.org/10.1007/s00216-018-0943-8] [PMID: 29546546]
[http://dx.doi.org/10.1093/nar/gki915] [PMID: 16260472]
[http://dx.doi.org/10.1006/abio.1994.1360] [PMID: 7526740]
[http://dx.doi.org/10.4161/bioe.32110] [PMID: 25482231]
[http://dx.doi.org/10.1007/978-1-59745-248-9_3] [PMID: 21125481]
[http://dx.doi.org/10.1111/j.1432-1033.1973.tb02785.x] [PMID: 4577197]
[http://dx.doi.org/10.1093/nar/gkaa662] [PMID: 32766783]
[PMID: 34586576]
[http://dx.doi.org/10.1016/0076-6879(87)55027-3] [PMID: 2828872]
[http://dx.doi.org/10.1093/nar/21.23.5480] [PMID: 7505427]
[http://dx.doi.org/10.1093/nar/21.8.1927] [PMID: 8493106]
[http://dx.doi.org/10.1038/228227a0] [PMID: 4920917]
[http://dx.doi.org/10.1073/pnas.81.7.2035] [PMID: 6371808]
[http://dx.doi.org/10.1016/j.biotechadv.2018.10.001] [PMID: 30290194]
[http://dx.doi.org/10.2533/000942905777675589]
[http://dx.doi.org/10.1016/0076-6879(89)80091-6] [PMID: 2482430]
[http://dx.doi.org/10.1093/nar/15.21.8783] [PMID: 3684574]
[http://dx.doi.org/10.1016/j.bbrc.2005.05.166] [PMID: 15975554]
[http://dx.doi.org/10.1017/S1355838299991033] [PMID: 10496227]
[http://dx.doi.org/10.1007/s10858-015-9967-y] [PMID: 26188386]
[PMID: 8608452]
[http://dx.doi.org/10.1093/nar/24.5.977] [PMID: 8600468]
[http://dx.doi.org/10.1093/nar/gks977] [PMID: 23118482]
[http://dx.doi.org/10.1261/rna.1862210] [PMID: 20100812]
[http://dx.doi.org/10.3390/ijms17122134] [PMID: 27999357]
[http://dx.doi.org/10.1021/ja049009h] [PMID: 15355104]
[http://dx.doi.org/10.1021/jacs.1c00014] [PMID: 33797236]
[http://dx.doi.org/10.1039/C8OB01498A] [PMID: 30063056]
[http://dx.doi.org/10.1038/nbt1001] [PMID: 15300257]
[http://dx.doi.org/10.1016/j.jbiotec.2013.07.005] [PMID: 23871655]
[http://dx.doi.org/10.1093/nar/gkv367] [PMID: 25897116]
[http://dx.doi.org/10.1093/nar/gkv734] [PMID: 26209133]
[http://dx.doi.org/10.1002/cbic.202100004] [PMID: 33822453]
[http://dx.doi.org/10.1038/nrd.2017.243] [PMID: 29326426]
[http://dx.doi.org/10.1021/acscentsci.1c00197] [PMID: 34075344]
[http://dx.doi.org/10.1038/s41586-020-2622-0] [PMID: 32756549]
[http://dx.doi.org/10.1038/nature14352] [PMID: 25938715]
[http://dx.doi.org/10.1073/pnas.102577799] [PMID: 12011423]
[http://dx.doi.org/10.1016/j.jmb.2006.06.050] [PMID: 16859707]
[http://dx.doi.org/10.1021/jacs.7b03981] [PMID: 28715205]
[http://dx.doi.org/10.3389/fmicb.2014.00565] [PMID: 25400626]
[http://dx.doi.org/10.1126/science.161.3839.387] [PMID: 5661298]
[http://dx.doi.org/10.1038/358203a0] [PMID: 1630488]
[http://dx.doi.org/10.1080/10409230490460765] [PMID: 15217990]
[http://dx.doi.org/10.1021/jacs.9b06453] [PMID: 31298852]
[http://dx.doi.org/10.1021/jacs.0c12955] [PMID: 33636080]
[http://dx.doi.org/10.1002/cbic.202100161] [PMID: 34043861]
[PMID: 18283608]
[http://dx.doi.org/10.1002/0471142700.nc0216s38]
[http://dx.doi.org/10.1021/ja0636587] [PMID: 16984152]
[http://dx.doi.org/10.1007/978-981-13-1912-9]
[PMID: 23638319]
[PMID: 28824341]
[http://dx.doi.org/10.1016/S0040-4039(01)90461-7]
[http://dx.doi.org/10.1021/bi00857a021] [PMID: 6036831]
[http://dx.doi.org/10.1021/ja01002a074] [PMID: 6064358]
[http://dx.doi.org/10.4061/2011/805253] [PMID: 22013508]
[http://dx.doi.org/10.1021/ja01093a058] [PMID: 14322545]
[PMID: 1422073]
[http://dx.doi.org/10.1073/pnas.90.4.1208] [PMID: 7679493]
[http://dx.doi.org/10.1139/v82-165]
[http://dx.doi.org/10.1021/ja980730v]
[http://dx.doi.org/10.1016/S0960-894X(00)80610-1]
[http://dx.doi.org/10.1016/j.tet.2007.07.102]
[http://dx.doi.org/10.1039/b809851d] [PMID: 19020680]
[http://dx.doi.org/10.1139/v07-005]
[http://dx.doi.org/10.1016/S0040-4039(01)02274-2]
[http://dx.doi.org/10.1093/nar/15.2.397] [PMID: 3822812]
[http://dx.doi.org/10.1016/0300-9084(93)90019-O] [PMID: 7684933]
[http://dx.doi.org/10.3762/bjoc.13.134] [PMID: 28781703]
[http://dx.doi.org/10.1021/ja00159a059]
[http://dx.doi.org/10.1021/jo301052v] [PMID: 22931131]
[http://dx.doi.org/10.1093/nar/gku1115] [PMID: 25398895]
[http://dx.doi.org/10.3390/ijms21145127] [PMID: 32698484]
[http://dx.doi.org/10.1038/s41467-021-21839-4] [PMID: 33727561]
[http://dx.doi.org/10.1172/JCI33483] [PMID: 18060019]
[http://dx.doi.org/10.1016/j.actbio.2021.06.020] [PMID: 34133982]
[http://dx.doi.org/10.1039/c0nj00041h]
[http://dx.doi.org/10.1261/rna.045054.114] [PMID: 24821854]
[http://dx.doi.org/10.1002/chem.19970030118]
[http://dx.doi.org/10.1021/acs.orglett.5b02769] [PMID: 26492193]
[http://dx.doi.org/10.1021/jm049167j] [PMID: 15715458]
[http://dx.doi.org/10.1016/j.drudis.2017.09.018] [PMID: 28988994]
[http://dx.doi.org/10.1016/S1074-5521(00)00058-2] [PMID: 11182314]
[http://dx.doi.org/10.1093/nar/gki193] [PMID: 15653644]
[http://dx.doi.org/10.1016/j.omtn.2020.10.032] [PMID: 33335793]
[http://dx.doi.org/10.1038/gt.2010.133] [PMID: 21179173]
[http://dx.doi.org/10.1038/srep30377] [PMID: 27461380]
[http://dx.doi.org/10.1093/nar/gks672] [PMID: 22798499]
[http://dx.doi.org/10.1093/nar/28.18.3625] [PMID: 10982885]
[http://dx.doi.org/10.1038/s41598-021-82425-8] [PMID: 33531619]
[http://dx.doi.org/10.1021/jo902560f] [PMID: 20136157]
[http://dx.doi.org/10.1039/c2cc32286b] [PMID: 22614180]
[http://dx.doi.org/10.1093/nar/gkab718] [PMID: 34417625]
[http://dx.doi.org/10.1016/j.bmcl.2013.10.006] [PMID: 24432386]
[http://dx.doi.org/10.1021/jo502189h] [PMID: 25375974]
[http://dx.doi.org/10.1002/cbic.202000803] [PMID: 33427360]
[http://dx.doi.org/10.1002/chem.19970030920]
[http://dx.doi.org/10.1021/acs.joc.1c02254] [PMID: 35133166]
[http://dx.doi.org/10.1016/j.crvi.2003.10.004] [PMID: 14746272]
[http://dx.doi.org/10.1021/jm050822c] [PMID: 16509579]
[http://dx.doi.org/10.1002/cbdv.200900185] [PMID: 20087996]
[http://dx.doi.org/10.1038/s41598-019-43772-9] [PMID: 31110191]
[http://dx.doi.org/10.1002/cbic.201800702] [PMID: 30552742]
[http://dx.doi.org/10.1021/ja207086x] [PMID: 21919455]
[http://dx.doi.org/10.1016/j.bmc.2009.06.045] [PMID: 19604699]
[http://dx.doi.org/10.1039/c0ob01085e] [PMID: 21431171]
[http://dx.doi.org/10.1021/ja042564z] [PMID: 15783191]
[http://dx.doi.org/10.1016/j.bmcl.2011.03.111] [PMID: 21524577]
[http://dx.doi.org/10.1093/nar/gkaa299] [PMID: 32356888]
[http://dx.doi.org/10.1038/ncomms7317] [PMID: 25744034]
[http://dx.doi.org/10.1093/nar/gkab544] [PMID: 34268578]
[http://dx.doi.org/10.1021/acschembio.0c00163] [PMID: 32275390]
[http://dx.doi.org/10.1056/NEJMoa1813279] [PMID: 31597037]
[http://dx.doi.org/10.1093/nar/gkl339] [PMID: 16717282]
[http://dx.doi.org/10.1002/anie.200502215] [PMID: 16304655]
[http://dx.doi.org/10.1002/asia.201500765] [PMID: 26248050]
[http://dx.doi.org/10.1038/nature21351] [PMID: 28102265]
[http://dx.doi.org/10.1002/bip.23399] [PMID: 32969496]
[http://dx.doi.org/10.1021/ja202492e] [PMID: 21612237]
[http://dx.doi.org/10.1021/cb500270x] [PMID: 24896732]
[http://dx.doi.org/10.1039/C7OB02654D] [PMID: 29164215]
[http://dx.doi.org/10.1038/s12276-020-0407-z] [PMID: 32210357]
[http://dx.doi.org/10.1021/acschembio.6b00960] [PMID: 28051309]
[http://dx.doi.org/10.1038/s41556-019-0319-0] [PMID: 31048770]
[http://dx.doi.org/10.1016/j.cell.2017.05.045] [PMID: 28622506]
[http://dx.doi.org/10.1002/ejoc.201600519]
[http://dx.doi.org/10.3390/molecules25153344] [PMID: 32717917]
[http://dx.doi.org/10.1007/s00706-003-0592-1]
[http://dx.doi.org/10.1093/nar/30.5.1124] [PMID: 11861902]
[http://dx.doi.org/10.1038/s41598-019-42523-0] [PMID: 30988454]
[http://dx.doi.org/10.1039/C7CC05159J] [PMID: 28748236]
[http://dx.doi.org/10.1021/jacs.1c08649] [PMID: 34637287]
[http://dx.doi.org/10.1093/nar/gkz008] [PMID: 30698800]
[http://dx.doi.org/10.3349/ymj.2020.61.4.273] [PMID: 32233169]
[http://dx.doi.org/10.1038/s41573-020-0075-7] [PMID: 32782413]
[http://dx.doi.org/10.1038/ncomms4459] [PMID: 24619206]
[http://dx.doi.org/10.1039/D0RA03934A] [PMID: 35514591]
[http://dx.doi.org/10.1016/j.bmcl.2021.128242] [PMID: 34217829]
[http://dx.doi.org/10.1039/C7CC04092J] [PMID: 28736781]
[http://dx.doi.org/10.3390/molecules26113100] [PMID: 34067312]
[http://dx.doi.org/10.1038/s41573-021-00219-z] [PMID: 34145432]
[http://dx.doi.org/10.1016/j.xcrm.2021.100346] [PMID: 34337562]
[http://dx.doi.org/10.1038/nrd4278] [PMID: 25233993]
[http://dx.doi.org/10.1038/nature21428] [PMID: 28151488]
[http://dx.doi.org/10.1056/NEJMoa2034577] [PMID: 33301246]
[http://dx.doi.org/10.1056/NEJMoa2035389] [PMID: 33378609]
[http://dx.doi.org/10.1126/science.1690918] [PMID: 1690918]
[http://dx.doi.org/10.1007/s13273-021-00171-4] [PMID: 34567201]
[http://dx.doi.org/10.3762/bjoc.13.274] [PMID: 30018667]
[http://dx.doi.org/10.1093/jimb/kuab063] [PMID: 34463324]
[http://dx.doi.org/10.1007/978-1-62703-260-5_4] [PMID: 23296927]
[PMID: 11680853]
[http://dx.doi.org/10.1093/nar/gkaa032] [PMID: 31984425]
[http://dx.doi.org/10.3390/polym12081633] [PMID: 32717794]
[http://dx.doi.org/10.3389/fcell.2021.789427] [PMID: 34805188]
[PMID: 34871810]
[http://dx.doi.org/10.1088/1361-648X/aa5561] [PMID: 28004640]
[http://dx.doi.org/10.3390/molecules25010204] [PMID: 31947834]
[http://dx.doi.org/10.1021/acs.bioconjchem.1c00211] [PMID: 34323473]