Abstract
The method for sequence analysis of large oligodeoxyribonucleotides based on the characteristic mobility shifts of their sequential partial degradation products on two-dimensional homochromatography has been perfected using a large number of synthetic oligodeoxyribonucleotides of defined sequences as standards. Flat bed electrophoresis with careful temperature control gave entirely reproducible mobilities in the first dimension. Using this information, an accurate formula has been derived for calculating the relative electrophoretic mobilities of oligodeoxyribonucleotides of any composition. This formula is used to calculate the mobility shifts between two consecutive oligodeoxyribonucleotides in a series of partial products of an unknown oligomer distributed in the two-dimensional homochromatogram which differ by one nucleotide in length. This is compared with the observed mobility shift value to identify the added nucleotide. This provides a direct and rapid method for obtaining the unambiguous sequence of an entire oligodeoxyribonucleotide up to 15 nucleotides in length.
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