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ARTICLE |
An Optimized Method for In Situ Hybridization with Signal Amplification That Allows the Detection of Rare mRNAs
Hui Yanga, Ina B. Wannera, Stephen D. Ropera, and Nirupa Chaudhariaa Department of Physiology and Biophysics, University of Miami School of Medicine, Miami, Florida
Correspondence to: Nirupa Chaudhari, Dept. of Physiology and Biophysics (R430), U. of Miami School of Medicine, PO Box 016430, Miami, FL 33101.
In situ hybridization (ISH) using nonradioactive probes enables mRNAs to be detected with improved cell resolution but compromised sensitivity compared to ISH with radiolabeled probes. To detect rare mRNAs, we optimized several parameters for ISH using digoxygenin (DIG)-labeled probes, and adapted tyramide signal amplification (TSA) in combination with alkaline phosphatase (AP)-based visualization. This method, which we term TSA-AP, achieves the high sensitivity normally associated with radioactive probes but with the cell resolution of chromogenic ISH. Unlike published protocols, long RNA probes (up to 2.61 KB) readily permeated cryosections and yielded stronger hybridization signals than hydrolyzed probes of equivalent complexity. RNase digestion after hybridization was unnecessary and led to a substantial loss of signal intensity without significantly reducing nonspecific background. Probe concentration was also a key parameter for improving signal-to-noise ratio in ISH. Using these optimized methods on rat taste tissue, we detected mRNA for mGluR4, a receptor, and transducin, a G-protein, both of which are expressed at very low abundance and are believed to be involved in chemosensory transduction. Because the effect of the tested parameters was similar for ISH on sections of brain and tongue, we believe that these methodological improvements for detecting rare mRNAs may be broadly applicable to other tissues. (J Histochem Cytochem 47:431–445, 1999)
Key Words: rare mRNA, in situ hybridization, tyramide amplification, taste, sensory transduction
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