Riboprobes are RNA probes that can be produced by in vitro transcription of cloned DNA inserted in a suitable plasmid downstream of a viral promoter.
Viruses code for their own RNA polymerases, which are highly specific for the viral promoters. Using these enzymes, labeled NTPs, and inserts in both forward and reverse orientations, both sense and antisense riboprobes can be generated from a cloned gene.
Transcription of RNA is performed with the appropriate RNA polymerase (T3, T7 or SP6), depending on the RNA polymerase promoter sites present in the chosen vector. Because these polymerases are extremely promoter-specific (i.e., there is almost no transcriptional cross talk), virtually homogeneous RNA can be obtained using plasmid DNA as the template in a transcription reaction. When it is desirable to copy only insert DNA sequences, the plasmid is linearized at an appropriate restriction site before the transcription reaction and only discrete “run-off” transcripts are obtained, virtually free of vector sequences. RNA transcripts may be used to generate radioactive probes for hybridization to Northern and Southern blots, plaque and colony lifts as well as non-radioactive probes (i.e, labeled with digoxgenin)for in situ hybridization.
Recent references using riboprobes include:
In situ hybridization
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