Nucleic Acids Res 22(2): 131-136
Studies on the base pairing properties of deoxyinosine by solid phase hybridisation to oligonucleotides.
Abstract
Extensive analyses of the base-pairing properties of deoxyinosine to A, C, G, and T were carried out by measuring the hybridisation of oligonucleotides with deoxyinosine in various positions to complementary sets of oligonucleotides made as an array on the surface of a glass microscope slide. With deoxyinosine in internal positions, results are consistent with previous studies, showing a preferential order for pairing of I-C > I-A > I-G approximately I-T. With two adjacent deoxyinosines in the centre of the oligonucleotide, the order in duplex yield is CC > CA > AA > AC > GC > GA > CG > TA > TC > CT = AG > AT > GT > TT. With deoxyinosine at the ends of the oligonucleotide, we find that at the 3' end there is the same order in duplex yield as for the deoxyinosine in internal positions, though with lower discrimination between the bases. When hybridisation is carried out in TMACI there is little base pairing discrimination with deoxyinosine, or indeed any of the four natural bases at the 5' end. Changing the cation to Na+ increased discrimination slightly.
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