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A Method for Targeted 16S Sequencing of Human Milk Samples
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Comprehensive census of bacteria in clean rooms by using DNA microarray and cloning methods.

Myron T La Duc1, Shariff Osman, Parag Vaishampayan

  • 1Biotechnology and Planetary Protection, NASA Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 89, Oak Grove Dr., Pasadena, CA 91109, USA.

Applied and Environmental Microbiology
|August 25, 2009
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DNA microarray analysis revealed significantly more bacterial taxa in clean rooms than gene sequencing. Different bacterial populations were found in facilities for the Phoenix and Mars Science Laboratory missions, impacting extraterrestrial life detection.

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Area of Science:

  • Microbiology
  • Astrobiology
  • Space Science

Background:

  • Clean rooms are critical environments for spacecraft assembly.
  • Contamination by microbial communities can compromise sensitive experiments, including extraterrestrial life detection.

Purpose of the Study:

  • To characterize the bacterial populations in clean room facilities used for spacecraft assembly.
  • To compare the effectiveness of 16S rRNA gene sequencing and DNA microarray (PhyloChip) analysis for microbial census.

Main Methods:

  • Collected surface samples from clean rooms at Lockheed Martin Aeronautics (LMA-MTF), Kennedy Space Center (KSC-PHSF), and Jet Propulsion Laboratory (JPL-SAF).
  • Analyzed bacterial populations using 16S rRNA gene cloning and sequencing, and DNA microarray (PhyloChip) technology.
  • Compared microbial diversity and composition between facilities and mission phases.

Main Results:

  • DNA microarray identified 9- to 70-fold more bacterial taxa than 16S rRNA gene sequencing.
  • JPL-SAF (Mars Science Laboratory mission) had a less diverse bacterial population compared to LMA-MTF and KSC-PHSF (Phoenix mission).
  • Arid-condition-thriving bacteria were prevalent in JPL-SAF, while proteobacteria dominated KSC-PHSF.

Conclusions:

  • Comprehensive bacterial censuses are essential for identifying potential contaminants in space missions.
  • DNA microarray technology offers high sensitivity and robustness for monitoring contamination in critical environments.
  • Findings support the proactive identification of biomatter to safeguard extraterrestrial life detection experiments.