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Published on: June 25, 2014
Tagging Hansenula polymorpha genes by random integration of linear DNA fragments (RALF)
R van Dijk1, K N Faber, A T Hammond
1Eukaryotic Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute (GBB), University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands.
Molecular Genetics and Genomics : MGG
|January 26, 2002
Summary
We developed Random integration of Linear DNA Fragments (RALF) for gene tagging in Hansenula polymorpha. This method efficiently isolates mutants, aiding in the discovery of new genes involved in peroxisome biogenesis and degradation.
Area of Science:
- Microbiology
- Molecular Biology
- Yeast Genetics
Background:
- Gene tagging and mutagenesis are crucial for understanding gene function in model organisms like Hansenula polymorpha.
- Restriction enzyme-mediated integration (REMI) is a known mutagenesis technique, but its efficiency and application in H. polymorpha require optimization.
Purpose of the Study:
- To investigate the feasibility of using a modified REMI approach for efficient gene tagging and mutant isolation in H. polymorpha.
- To develop and characterize a novel gene tagging method, termed Random integration of Linear DNA Fragments (RALF), for H. polymorpha.
Main Methods:
- Utilized a non-replicative plasmid, pREMI-Z, containing a zeocin resistance cassette for integration and mutagenesis.
- Optimized transformation protocols by comparing linearized and circular plasmids, with and without restriction endonuclease addition.
- Screened transformants for mutants defective in peroxisome biogenesis (pex) and selective peroxisome degradation (pdd).
Main Results:
- High transformation efficiency was achieved using linearized pREMI-Z, with only a slight increase upon addition of restriction endonuclease.
- Integration of pREMI-Z occurred randomly throughout the H. polymorpha genome, validating the RALF method.
- RALF successfully identified known PEX genes and novel genes involved in peroxisome pathways, including H. polymorpha PEX12.
Conclusions:
- Random integration of Linear DNA Fragments (RALF) is a powerful and efficient tool for gene tagging in H. polymorpha.
- RALF facilitates genome-wide mutagenesis screens, enabling the discovery of genes involved in essential cellular processes like peroxisome biogenesis.
