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. 2023 Jul 18;51(15):7749–7761. doi: 10.1093/nar/gkad608

Table 6.

T m Values of the duplexes formed between GuNA[R,R]-modified oligonucleotides and the complementary strandsa

T mTm/mod.) [°C]
Name Oligonucleotides (5′–3′) Modification (A or mC = ) vs. ssRNA vs. ssDNA
ODN22 d(GCGTTATTTGCT) 45 49
ODN13 d(GCGTTATTTGCT) GuNA[Me,Me] 50 (+5) 53 (+4)
ODN14 GuNA[Me,tBu] 51 (+6) 54 (+5)
ODN23 d(GCGTTCTTTGCT) 52 53
ODN17 d(GCGTTmCTTTGCT) GuNA[Me,Me] 59 (+7) 60 (+7)
ODN18 GuNA[Me,tBu] 60 (+8) 61 (+8)

aConditions: 10 mM sodium phosphate buffer (pH 7.2), 100 mM NaCl, 4 μM each oligonucleotide, 0.5°C/min at 260 nm. Target strands: 5′-r(AGCAAAAAACGC)-3′ and 5′-d(AGCAAAAAACGC)-3′. The Tm values reflect the average of three measurements. ΔTm/mod.: change in Tm value (ΔTm) per modification compared to the unmodified oligonucleotide (ODN22 or ODN23).