title: LNA guanine and 2,6-diaminopurine. Synthesis, characterization and hybridization properties of LNA 2,6-diaminopurine containing oligonucleotides.
abstract: LNA guanine and 2,6-diaminopurine (D) phosphoramidites have been synthesized as building blocks for antisense oligonucleotides (ON). The effects of incorporating LNA D into ON were investigated. As expected, LNA D containing ON showed increased affinity towards complementary DNA (Delta Tm +1.6 to +3.0 degrees C) and RNA (Delta Tm +2.6 to +4.6 degrees C) ON. To evaluate if LNA D containing ON have an enhanced mismatch sensitivity compared to their complementary LNA A containing ON thermal denaturation experiments towards singly mismatched DNA and RNA ON were undertaken. Replacing one LNA A residue with LNA D, in fully LNA modified ON, resulted in higher mismatch sensitivity towards DNA ON (Delta Delta Tm -4 to >-17 degrees C). The same trend was observed towards singly mismatched RNA ON (Delta Delta Tm D-a = -8.7 degrees C and D-g = -4.5 degrees C) however, the effect was less clearcut and LNA A showed a better mismatch sensitivity than LNA D towards cytosine (Delta Tm +5.5 degrees C).
authors.affiliation: Santaris Pharma A/S, Bøge Allé 3, DK-2970 Hørsholm, Denmark.
authors.forename: Christoph
authors.initials: C
authors.lastname: Rosenbohm
authors.forename: Daniel Sejer
authors.initials: DS
authors.lastname: Pedersen
authors.forename: Miriam
authors.initials: M
authors.lastname: Frieden
authors.forename: Flemming R
authors.initials: FR
authors.lastname: Jensen
authors.forename: Susan
authors.initials: S
authors.lastname: Arent
authors.forename: Sine
authors.initials: S
authors.lastname: Larsen
authors.forename: Troels
authors.initials: T
authors.lastname: Koch
mesh_terms: D015075:2-Aminopurine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry*; D006147:Guanine / Q000138:chemical synthesis / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D009693:Nucleic Acid Hybridization; D009841:Oligonucleotides / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D009841:Oligonucleotides; D015075:2-Aminopurine; C007300:2,6-diaminopurine; D006147:Guanine