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We have used a chemiluminescent detection method to improve both the sensitivity and the speed of detection of human genes with oligonucleotide probes. A direct chemiluminescent substrate (AMPPD) was used in combination with an alkaline-phosphatase-labeled oligonucleotide probe to detect the human tissue of plasminogen activator gene by Southern blot analysis. X-ray exposures obtained after 4 h were comparable to those obtained after 7 days with a 32P-labeled oligomer. After 16 h, the signal was 12 times greater than the 32P signal. The detection of the single-copy tissue plasminogen activator gene in 0.25 micrograms of human genomic DNA (76,000 molecules) was achieved. The improved sensitivity obtained by chemiluminescent detection should increase the usefulness of oligonucleotide probes in the direct Southern analysis of human genetic disorders.
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I Bronstein
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