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Genomic DNA in Prokaryotes00:46

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Small-Scale Extraction of Caenorhabditis elegans Genomic DNA
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A modified method for genomic DNA extraction from the fish intestinal microflora.

Zhuoran Han1,2, Jingfeng Sun3, Aijun Lv1

  • 1Tianjin Key Lab of Aqua-ecology and Aquaculture, Fisheries College, Tianjin Agricultural University, Tianjin, 300384, China.

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Summary

A new DNA extraction method, the combination of lysozyme and ultrasonic lysis (CLU), efficiently isolates high-quality fish DNA. This cost-effective technique yields high-molecular-weight DNA suitable for molecular biology applications.

Keywords:
DNA concentrationFish intestinal microfloraGenomic DNA extractionModified methodOD260/OD280 ratio

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Analyzing fish intestinal microflora requires efficient genomic DNA extraction.
  • Existing methods may have limitations in yield, quality, or cost-effectiveness.

Purpose of the Study:

  • To develop and evaluate a modified genomic DNA extraction method, the combination of lysozyme and ultrasonic lysis (CLU), for fish intestinal microflora analysis.
  • To compare the CLU method's performance against established techniques.

Main Methods:

  • The CLU method combines physical disruption (ultrasonic lysis) and chemical lysis (lysozyme).
  • Key parameters, including incubation temperatures for lysozyme and RNase, were optimized.
  • DNA yield and purity were assessed using OD260/OD280 ratios and agarose gel electrophoresis.
  • The quality of extracted DNA was evaluated by amplifying the 16S rDNA V3 region.

Main Results:

  • The CLU method yielded high-quality DNA with OD260/OD280 ratios around 2.02-2.08 and concentrations up to 309.8 µg/µL.
  • Agarose gel electrophoresis showed a major high-intensity band of DNA >10 kb, indicating minimal degradation.
  • Optimized incubation temperatures (60°C lysozyme, 30°C RNase) reduced DNA smearing compared to 37°C for both.
  • Successful amplification of the 16S rDNA V3 region (~600 bp) confirmed DNA suitability for PCR.

Conclusions:

  • The CLU method is a simple, cost-effective, and efficient technique for extracting high-quality, high-molecular-weight genomic DNA from fish intestinal microflora.
  • The extracted DNA is suitable for various molecular biology applications, comparable to commercial kits.