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T7 DNA polymerase with chemically inactivated 3'-5' exo-nuclease activity, as well as unmodified T7 DNA polymerase, were used for sequencing by the dideoxy method in an automated system with fluorescence labelled primer and on-line detection of laser-excited reaction products. An analysis of signal intensity variations in the C track revealed that low C signals were usually preceded by a T in the sequence. This effect was modified by surrounding nucleotides. Signal intensities were more uniform with T7 polymerase than with the Klenow fragment of DNA polymerase I. Some sequences ambiguous with the Klenow enzyme could easily be evaluated with the T7 enzyme. One sequence could only be read by the unmodified T7 polymerase, while both the Klenow fragment and the chemically modified T7 enzyme gave uninterpretable data.

T7 DNA polymerase in automated dideoxy sequencing