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RACE and RAGE cloning in parasitic microbial eukaryotes
Bryony A P Williams1, Robert P Hirt
1Department of Botany, University of British Columbia, Vanvouver, Canada.
Methods in Molecular Biology (Clifton, N.J.)
|May 22, 2004
Summary
Researchers developed RACE and RAGE PCR methods to clone full-length genes from parasitic microbes. This technique successfully identified mitochondrial genes in microsporidia, revealing the presence of mitochondrial-like organelles.
Area of Science:
- Molecular biology
- Parasitology
- Microbial eukaryotes
Background:
- Gene cloning often yields partial sequences, necessitating methods to obtain full-length open reading frames (ORFs).
- Traditional gene library construction is complex and time-consuming.
- PCR-based approaches offer efficient alternatives using limited starting material.
Purpose of the Study:
- To present and validate two PCR-based methods, RACE (using cDNA) and RAGE (using genomic DNA), for cloning full-length ORFs.
- To apply these methods to amitochondriate parasitic microbial eukaryotes, specifically microsporidia.
- To investigate genes of mitochondrial origin and their implications in these organisms.
Main Methods:
- Rapid Amplification of cDNA Ends (RACE) using cDNA template.
- Rapid Amplification of Genomic Ends (RAGE) using genomic DNA template.
- Complementary use of RACE and RAGE to achieve full-length gene cloning.
Main Results:
- Successful cloning and sequencing of a full-length mitochondrial Hsp70 gene from microsporidia.
- Development of a specific antibody against a fusion protein of mitochondrial Hsp70.
- Demonstration of mitochondrial-like organelles in microsporidia using the specific antibody.
Conclusions:
- RACE and RAGE are effective strategies for cloning full-length genes from limited biological samples, such as microsporidia spores.
- The findings confirm the presence of mitochondrial-like organelles in microsporidia, offering insights into their evolutionary and biomedical significance.
- This work provides a foundation for further genetic and functional studies in amitochondriate eukaryotes.
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