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An optimized method for high quality DNA extraction from microalga Prototheca wickerhamii for genome sequencing
Tomasz Jagielski1, Jan Gawor2, Zofia Bakuła1
1Department of Applied Microbiology, Institute of Microbiology, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland.
Plant Methods
|October 14, 2017
Summary
A new DNA isolation method for Prototheca algae provides higher yield and purity. This technique is suitable for next-generation sequencing and whole genome sequencing of these yeast-like pathogens.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Algal cell walls present challenges for DNA extraction.
- Prototheca are yeast-like microalgae and the only known plant pathogens affecting humans and animals.
- Efficient DNA isolation is crucial for genomic studies of Prototheca.
Purpose of the Study:
- To develop a next-generation sequencing-suitable DNA isolation method for Prototheca.
- To compare the new method against existing DNA isolation techniques for plants and yeasts.
Main Methods:
- The new method utilizes glass beads pulverization and cesium chloride (CsCl) density gradient centrifugation.
- Compared against five other methods including liquid nitrogen grinding and enzymatic digestion.
- Evaluated DNA quantity, purity (A260/A280 and A260/A230 ratios), and integrity.
Main Results:
- The new method yielded significantly higher DNA concentrations (74.2 ng/µL) compared to other assays (average 16.15 ng/µL).
- Demonstrated superior DNA purity with improved A260/A280 and A260/A230 ratios.
- Isolated genomic DNA from Prototheca wickerhamii was successfully used for Illumina MiSeq sequencing.
Conclusions:
- A novel DNA isolation protocol for Prototheca algae has been established.
- The method surpasses existing techniques in DNA yield and quality.
- This is the first method enabling whole genome sequencing of Prototheca species.