Direct In Situ RT-PCR
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In situ polymerase chain reaction (PCR) is a histological technique that exploits the advantages of PCR for detection of mRNA
directly in tissue sections. It somehow conjugates together PCR and in situ hybridization that is more traditionally employed
for mRNA localization in cell organelles, intact cells, or tissue sections. This chapter describes the application of in situ
PCR for neuropeptide mRNA localization. We provide here a detailed protocol for direct in situ reverse transcription (RT)
PCR (RT-PCR) with nonradioactive probes after fixation and paraffin embedding or cryosectioning. Digoxigenin-labeled nucleotides
(digoxigenin-11-dUTP) are incorporated in the PCR product after RT and subsequently detected with an anti-digoxigenin antibody
conjugated with alkaline phosphatase. The procedure can be modified for use with fluorescent probes and employed in combination
with enzyme/fluorescence immunocytochemical labeling.