DNA sequencing and melting curve.

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Abstract
The dependence of DNA absorbance (for light at about 260 nm) on temperature is related to a specific DNA sequence structure in the vicinity of DNA thermal denaturation (the so-called DNA melting or coiling). A straightforward analysis of the experimental DNA melting curve allows the determination of the lenghts, the A + T content and the location in DNA of certain domains. In the case of a specific DNA fragmentation, the order of fragments in DNA can be learned from this analysis, nondestructively and quickly, without fractionating the fragments and other methods of fragmentation. If the DNA nucleotide sequence is known except for some sites and uncertain proteions, the analysis determines these sites and the accuracy of the sequence at the portions. This information may complement exact methods of DNA sequencing. The proposed analysis is applied to bacteriophage .vphi.X174, whose melting curve is known. The results are compared to and were in excellent agreement with the known .vphi.X174 nucleotide sequence.