All known life uses informational polymers based on nucleic acids. Future missions to Mars and Ocean Worlds such as Enceladus and/or Europa may target these or related polymers in the search for extant life beyond Earth. Nanopore-based devices represent a promising approach for sensing and characterizing these, and possibly other, biomarkers. Here we demonstrate low-input (200 pg)DNA sequencing, equivalent to extraction from 106 Bacillus subtilis spores at 5 percent extraction yield, using the Oxford Nanopore MinION in a thermal vacuum chamber under Mars-like temperature (−60°C), atmosphere (100% CO2), and pressure (400 to 500 Pa). Current limits of detection correspond to 2 to 5 pg DNA. With additional advances in nucleic acid extraction and library preparation efficiency, a sequencing-based approach to life detection will be viable at cell densities representative of the most extreme Mars analog environments here on Earth.


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    Title :

    Nucleic Acid Sequencing Under Mars-Like Conditions




    Publication date :

    2019-03-01


    Size :

    7728540 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English