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DNA and RNA sequencing utilizing phosphorothioate chemistry.

A method for nucleic acid sequencing has been developed based on the observation that phosphorothioate diesters are hydrolysed by treatment with 2-iodoethanol in a solution of aqueous ethanol. For DNA sequencing, primed single-stranded M13 DNA is polymerised with the Klenow fragment of DNA polymerase I in the presence of the three normal deoxyribonucleotide triphosphates and one alpha-phosphorothioate derivative. This is followed by treatment with 2-iodoethanol, precipitation of the DNA fragments and analysis by polyacrylamide electrophoresis. RNA transcribed from plasmids containing the SP6 RNA polymerase promoter is sequenced by including the alpha-phosphorothioate derivative of the ribonucleotide triphosphates in the polymerisation and treating the product with iodoethane. The cleavage reaction involves alkylation of the sulfur atom to form the phosphorothioate triester and hydrolysis catalysed by an adjacent hydroxyl group.[1]

References

  1. DNA and RNA sequencing utilizing phosphorothioate chemistry. Gish, G., Eckstein, F. Nucleic Acids Symp. Ser. (1987) [Pubmed]
 
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