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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1996 Feb 6;93(3):1352–1356. doi: 10.1073/pnas.93.3.1352

Extending the chemistry that supports genetic information transfer in vivo: phosphorothioate DNA, phosphorothioate RNA, 2'-O-methyl RNA, and methylphosphonate DNA.

D S Thaler 1, S Liu 1, G Tombline 1
PMCID: PMC40084  PMID: 8577768

Abstract

DNA and RNA are the polynucleotides known to carry genetic information in life. Chemical variants of DNA and RNA backbones have been used in structure-function and biosynthesis studies in vitro, and in antisense pharmacology, where their properties of nuclease resistance and enhanced cellular uptake are important. This study addressed the question of whether the base(s) attached to artificial backbones encodes genetic information that can be transferred in vivo. Oligonucleotides containing chemical variants of DNA or RNA were used as primers for site-specific mutagenesis of bacteriophage f1. Progeny phage were scored both genetically and physically for the inheritance of information originally encoded by bases attached to the nonstandard backbones. Four artificial backbone chemistries were tested: phosphorothioate DNA, phosphorothioate RNA, 2'-O-methyl RNA and methylphosphonate DNA. All four were found capable of faithful information transfer from their attached bases when one or three artificial positions were flanked by normal DNA. Among oligonucleotides composed entirely of nonstandard backbones, only phosphorothioate DNA supported genetic information transfer in vivo.

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Selected References

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