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American Journal of Pathology, Vol 139, 1239-1244, Copyright © 1991 by American Society for Investigative Pathology

REGULAR ARTICLES

An improved technique for the in situ detection of DNA after polymerase chain reaction amplification

GJ Nuovo, F Gallery, P MacConnell, J Becker and W Bloch
Department of Pathology, SUNY, Stony Brook 11794-8691.

In situ detection of polymerase chain reaction (PCR)-amplified DNA in cell and tissue preparations previously required 5 to 7 primer pairs designed to generate a long (greater than 1,000 base pair) product. The authors describe a nonisotopic PCR in situ technique, employing a single primer pair and target sequences as short as 115 base pairs, that can detect one target molecule per cell. The essential procedural change is to withhold the DNA polymerase or primers until the reaction temperature approaches 80 degrees C. The Hot-Start method greatly increased amplification specificity which, more than product size, appears to determine success of in situ PCR. The marked improvement in specificity may permit target detection by direct incorporation of labeled nucleotides.

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