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Optimizing DNA extraction for sputum microbiota analysis is crucial. Combining dithiothreitol (DTT) with enzymatic treatments and an enzymatic kit enhances DNA yield and microbial detection.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • Sputum microbiota analysis is vital for respiratory health research.
  • Standardized DNA extraction protocols for sputum are lacking.
  • Variability in DNA extraction impacts microbiota study reproducibility.

Purpose of the Study:

  • To evaluate dithiothreitol (DTT) and enzymatic treatments for sputum DNA extraction.
  • To identify the optimal DNA extraction technique for sputum microbiota analysis.
  • To improve the reliability of 16S rRNA gene-based microbiota studies.

Main Methods:

  • Comparison of sputum treatments with and without DTT for DNA yield and qPCR.
  • Assessment of lysozyme and lysostaphin treatments on *S. aureus* detection via qPCR.
  • Evaluation of enzyme-based and bead-based DNA extraction kits for yield, qPCR, and diversity analysis.

Main Results:

  • DTT treatment reduced variability in DNA yield and 16S rRNA qPCR.
  • Lysostaphin and lysozyme treatments enhanced *S. aureus* detection.
  • An enzyme-based kit provided superior DNA yield and qPCR performance without affecting alpha-diversity.

Conclusions:

  • DTT treatment improves DNA extraction consistency for sputum microbiota.
  • Enzymatic treatments, particularly lysostaphin/lysozyme, boost specific bacterial detection.
  • A combined approach using DTT, enzymatic treatment, and an enzymatic kit is recommended for robust sputum microbiota analysis.