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Sugar modified oligonucleotides that detect and modulate gene expression

  • US 5,670,633 A
  • Filed: 03/05/1992
  • Issued: 09/23/1997
  • Est. Priority Date: 01/11/1990
  • Status: Expired due to Term
First Claim
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1. An oligonucleotide that hybridizes with RNA or DNA, having 5 to 50 covalently-bound nucleosides that individually include a ribose or deoxyribose sugar portion and a base portion, wherein:

  • said sugar portions of said nucleosides are joined together by 3'"'"'-5'"'"' internucleoside linkages such that the base portions of said nucleosides form a mixed base sequence that is complementary to an RNA base sequence or to a DNA base sequence; and

    at least two of said nucleosides include a modified deoxyfuranosyl moiety bearing a 2'"'"'-fluoro substituent; and

    whereina duplex formed between said oligonucleotide and its complement exhibits greater thermal stability than does a duplex formed between said complement and an oligonucleotide that does not include 2'"'"'-fluoro substituents.

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