What question did this study set out to answer?

To derive improved predictions for DNA duplex stability based on thermodynamic parameters.

January 1, 1996

Improved Nearest-Neighbor Parameters for Predicting DNA Duplex Stability

Key Points

To derive improved predictions for DNA duplex stability based on thermodynamic parameters.
Determined thermodynamic data from UV absorbance vs temperature profiles of 23 oligonucleotides.
Combined literature data for 21 sequences to derive improved nearest-neighbor parameters.
Optimized parameters for oligonucleotides dissolved in 1 M NaCl.
Improved parameters predict deltaG within 4%, deltaH within 7%, deltaS within 8%, and T(m) within 2 degrees C.
Observed stability trend: GC > CG > GG > GA approximately GT approximately CA > CT > AA > AT > TA.
Establishes key role of sequence and base composition in determining DNA duplex stability.

Abstract

Thermodynamic data were determined from UV absorbance vs temperature profiles of 23 oligonucleotides. These data were combined with data from the literature for 21 sequences to derive improved parameters for the 10 Watson-Crick nearest neighbors. The observed trend in nearest-neighbor stabilities at 37 degrees C is GC > CG > GG > GA approximately GT approximately CA > CT > AA > AT > TA (where only the top strand is shown for each nearest neighbor). This trend suggests that both sequence and base composition are important determinants of DNA duplex stability. On average, the improved parameters predict deltaG degrees(37), deltaH degrees, deltaS degrees, and T(m) within 4%, 7%, 8%, and 2 degrees C, respectively. The parameters are optimized for the prediction of oligonucleotides dissolved in 1 M NaC1.

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Improved Nearest-Neighbor Parameters for Predicting DNA Duplex Stability

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Abstract

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