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Experimental Protocol for Detecting Cyanobacteria in Liquid and Solid Samples with an Antibody Microarray Chip
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SOLID2: an antibody array-based life-detector instrument in a Mars Drilling Simulation Experiment (MARTE).

Víctor Parro1, Patricia Fernández-Calvo, José A Rodríguez Manfredi

  • 1Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, Madrid, Spain. parrogv@inta.es

Astrobiology
|December 25, 2008
PubMed
Summary

The Signs Of LIfe Detector (SOLID2) instrument successfully identified biological material in simulated Mars samples. This antibody array technology shows promise for detecting life in future space exploration missions.

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Area of Science:

  • Astrobiology
  • Biotechnology
  • Planetary Science

Background:

  • The search for extraterrestrial life requires sensitive and reliable detection instruments.
  • Antibody arrays offer a potential method for identifying specific biomolecules indicative of life.

Purpose of the Study:

  • To evaluate the performance of the Signs Of LIfe Detector (SOLID2), an antibody array-based instrument, in a simulated extraterrestrial environment.
  • To assess SOLID2's capability to detect biological material in deep-core samples.

Main Methods:

  • SOLID2, equipped with 157 antibodies, was integrated into a robotic drilling rig for a Mars drilling mission simulation (MARTE).
  • Automatic processing and analysis of ground core samples (0.5 g) from depths up to 5.5 meters were performed.
  • Control experiments involved high-temperature treatment of samples to verify the biological origin of detected signals.

Main Results:

  • Positive antibody reactions were observed for microorganisms like Leptospirillum ferrooxidans and Acidithiobacillus species, as well as for biofilm extracts from Río Tinto samples.
  • These positive signals were absent in heat-treated samples, confirming their biological origin and structural dependence.
  • SOLID2 demonstrated successful automatic sample processing and analysis.

Conclusions:

  • The antibody array-based SOLID2 instrument can effectively detect complex biological material.
  • SOLID2 is a viable candidate for future planetary missions focused on the search for life.