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A sensitive technique to clone low abundance receptor transcripts from single microdissected tissue punches.
Xinhai Yang1, James E Marchand
1Anesthesia Research Lab, Department of Pharmacology and Experimental Therapeutics, Tufts University School of Medicine, 136 Harrison Ave., Boston, MA 02111, USA. xinhai,yang@tufts.edu
Brain Research. Brain Research Protocols
|May 30, 2002
Summary
This study enhances tissue microdissection for gene expression analysis. Optimized techniques allow cloning of rare olfactory receptor (OR) genes from single, small tissue samples.
Area of Science:
- Molecular Biology
- Genetics
- Neuroscience
Background:
- Tissue microdissection enables gene expression analysis from small cell samples.
- Current limitations exist in isolating rare mRNA from minute tissue volumes.
Purpose of the Study:
- To develop an optimized protocol for amplifying and cloning rare mRNA from microdissected tissues.
- To demonstrate the protocol's efficacy using the olfactory receptor (OR) gene family.
Main Methods:
- Optimized RNA extraction and purification steps were integrated into the reverse-transcription polymerase chain reaction (RT-PCR) workflow.
- Nested degenerate primers were designed to amplify olfactory receptor (OR) genes.
- Tissue microdissection was performed on mouse main olfactory bulb (MOB) sections.
Main Results:
- The enhanced protocol successfully amplified, cloned, and sequenced multiple ORs from single, small tissue punches.
- Low-abundance OR mRNA was detected and localized in microdissected MOB samples.
- In situ hybridization confirmed the presence of cloned OR sequences in MOB sections.
Conclusions:
- The optimized protocol significantly improves the sensitivity of tissue microdissection for gene expression studies.
- This method facilitates the cloning of novel gene family members from limited tissue samples.
- The approach broadens the application of tissue microdissection in genetic research.