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Base pairing involving deoxyinosine: implications for probe design

Open access
Martin, Francis H., Castro, Miguel M., Aboul-ela, Fareed, Tinoco, Ignacio·1985·Nucleic Acids Research

Abstract

The thermal stability of oligodeoxyribonucleotide duplexes containing deoxyinosine (I) residues matched with each of the four normal DNA bases were determined by optical melting techniques. The duplexes containing at least one I were obtained by mixing equimolar amounts of an oligonucleotide of sequence dCA3XA3G with one of sequence dCT3YT3G where X and Y were A, C, G, T, or I. Comparison of optical melting curves yielded relative stabilities for the I-containing standard base pairs in an otherwise identical base-pair sequence. I:C pairs were found to be less stable than A:T pairs in these duplexes. Large neighboring-base effects upon stability were observed. For example, when (X,Y) = (I,A), the duplex is eight-fold more stable than when (X,Y) = (A,I). Independent of sequence effects the order of stabilities is: I:C greater than I:A greater than I:T congruent to I:G. This order differs from that of deoxyguanosine which pairs less strongly with dA; otherwise each deoxyinosine base pair is less stable than its deoxyguanosine counterpart in the same sequence environment. Implications of these results for design of DNA oligonucleotide probes are discussed.

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Metadata

Authors
Martin, F. H., Castro, M. M., Aboul-ela, F., & Tinoco, I.
Venue
Nucleic Acids Research
Published
1985
Volume
13
Issue
24
Pages
8927-8938
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W2084285144
Cited by
342
References
16
FWCI
3.94
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Base pairing involving deoxyinosine: implications for probe design. https://app.cochat.ai/papers/10.1093/nar/13.24.8927
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Martin, F. H., Castro, M. M., Aboul-ela, F., & Tinoco, I. (1985). Base pairing involving deoxyinosine: implications for probe design. Nucleic Acids Research. https://doi.org/10.1093/nar/13.24.8927

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