One-step, PCR-mediated, gene disruption in the yeast Hansenula polymorpha

Area of Science:

• Molecular Biology
• Yeast Genetics
• Biotechnology

Background:

• One-step gene disruption in Hansenula polymorpha has been challenging.
• Previous laboratory experience indicated difficulties with this technique.
• Systematic investigation of influencing factors was needed.

Purpose of the Study:

• To identify critical factors affecting one-step gene disruption frequency in H. polymorpha.
• To optimize conditions for efficient gene disruption.
• To develop improved PCR strategies for construct generation.

Main Methods:

• Systematic study of factors influencing gene disruption frequency.
• Evaluation of target gene region length flanking the marker gene.
• Testing of different gene markers, loci, and yeast strains.
• Development of an alternative PCR strategy.

Main Results:

• Target gene regions of approximately 1 kb flanking the marker gene are crucial for ~50% disruption frequency.
• Gene marker type, locus, and strain had minimal impact on disruption frequency.
• The highest disruption frequency for the YNR1 gene was observed in strain HMI39 using Saccharomyces cerevisiae URA3.
• A novel PCR strategy was developed due to limitations of existing methods with long flanking regions.

Conclusions:

• Optimizing flanking region length is key to successful one-step gene disruption in H. polymorpha.
• The developed PCR strategy facilitates gene disruption construct generation in H. polymorpha.
• Findings advance genetic manipulation techniques in industrial yeast strains.