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Nucleic Acids Research, Vol 25, Issue 21 4219-4223, Copyright © 1997 by Oxford University Press

ARTICLES

Method for phosphorothioate antisense DNA sequencing by capillary electrophoresis with UV detection

D Froim, CE Hopkins, A Belenky and AS Cohen
Analytical Research, Hybridon, Inc., Cambridge, MA 02139, USA.

The progress of antisense DNA therapy demands development of reliable and convenient methods for sequencing short single-stranded oligonucleotides. A method of phosphorothioate antisense DNA sequencing analysis using UV detection coupled to capillary electrophoresis (CE) has been developed based on a modified chain termination sequencing method. The proposed method reduces the sequencing cost since it uses affordable CE-UV instrumentation and requires no labeling with minimal sample processing before analysis. Cycle sequencing with ThermoSequenase generates quantities of sequencing products that are readily detectable by UV. Discrimination of undesired components from sequencing products in the reaction mixture, previously accomplished by fluorescent or radioactive labeling, is now achieved by bringing concentrations of undesired components below the UV detection range which yields a 'clean', well defined sequence. UV detection coupled with CE offers additional conveniences for sequencing since it can be accomplished with commercially available CE-UV equipment and is readily amenable to automation.
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