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Fingerprinting Non-Terran Biosignatures
Most strategies for life detection rely upon finding features known to be associated with terran life, such as particular classes of molecules. But life may be vastly different on other planets and moons, particularly as we expand our efforts to explore ocean worlds like Europa and Enceladus. We pro...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Mary Ann Liebert, Inc.
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6067094/ https://www.ncbi.nlm.nih.gov/pubmed/29634318 http://dx.doi.org/10.1089/ast.2017.1712 |
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author | Johnson, Sarah S. Anslyn, Eric V. Graham, Heather V. Mahaffy, Paul R. Ellington, Andrew D. |
author_facet | Johnson, Sarah S. Anslyn, Eric V. Graham, Heather V. Mahaffy, Paul R. Ellington, Andrew D. |
author_sort | Johnson, Sarah S. |
collection | PubMed |
description | Most strategies for life detection rely upon finding features known to be associated with terran life, such as particular classes of molecules. But life may be vastly different on other planets and moons, particularly as we expand our efforts to explore ocean worlds like Europa and Enceladus. We propose a new concept for life detection that harnesses the power of DNA sequencing to yield intricate informatics fingerprints, even for life that is not nucleic acid–based. The concept is based on the fact that folded nucleic acid structures (aptamers) have been shown to be capable of binding a wide variety of compounds, whether inorganic, organic, or polymeric, and irrespective of being from a biotic or abiotic source. Each nucleic acid sequence can be thought of as a code, and a combination of codes as a “fingerprint.” Over multiple analytes, the “fingerprint” of a non-terran sample can be analyzed by chemometric protocols to provide a classifier of molecular patterns and complexity. Ultimately the chemometric fingerprints of living systems, which may differ significantly from nonliving systems, could provide an empirical, agnostic means of detecting life. Because nucleic acids are exponentially amplified by the polymerase chain reaction, even very small input signals could be translated into a robust readable output. The derived sequences could be identified by a small, portable sequencing device or by capture and optical imaging on a DNA microarray. Without presupposing any particular molecular framework, this agnostic approach to life detection could be used from Mars to the far reaches of the Solar System, all within the framework of an instrument drawing little heat and power. |
format | Online Article Text |
id | pubmed-6067094 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Mary Ann Liebert, Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-60670942018-08-01 Fingerprinting Non-Terran Biosignatures Johnson, Sarah S. Anslyn, Eric V. Graham, Heather V. Mahaffy, Paul R. Ellington, Andrew D. Astrobiology Research Articles Most strategies for life detection rely upon finding features known to be associated with terran life, such as particular classes of molecules. But life may be vastly different on other planets and moons, particularly as we expand our efforts to explore ocean worlds like Europa and Enceladus. We propose a new concept for life detection that harnesses the power of DNA sequencing to yield intricate informatics fingerprints, even for life that is not nucleic acid–based. The concept is based on the fact that folded nucleic acid structures (aptamers) have been shown to be capable of binding a wide variety of compounds, whether inorganic, organic, or polymeric, and irrespective of being from a biotic or abiotic source. Each nucleic acid sequence can be thought of as a code, and a combination of codes as a “fingerprint.” Over multiple analytes, the “fingerprint” of a non-terran sample can be analyzed by chemometric protocols to provide a classifier of molecular patterns and complexity. Ultimately the chemometric fingerprints of living systems, which may differ significantly from nonliving systems, could provide an empirical, agnostic means of detecting life. Because nucleic acids are exponentially amplified by the polymerase chain reaction, even very small input signals could be translated into a robust readable output. The derived sequences could be identified by a small, portable sequencing device or by capture and optical imaging on a DNA microarray. Without presupposing any particular molecular framework, this agnostic approach to life detection could be used from Mars to the far reaches of the Solar System, all within the framework of an instrument drawing little heat and power. Mary Ann Liebert, Inc. 2018-07-01 2018-07-01 /pmc/articles/PMC6067094/ /pubmed/29634318 http://dx.doi.org/10.1089/ast.2017.1712 Text en © Sarah S. Johnson et al., 2018; Published by Mary Ann Liebert, Inc. This Open Access article is distributed under the terms of the Creative Commons Attribution Noncommercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. |
spellingShingle | Research Articles Johnson, Sarah S. Anslyn, Eric V. Graham, Heather V. Mahaffy, Paul R. Ellington, Andrew D. Fingerprinting Non-Terran Biosignatures |
title | Fingerprinting Non-Terran Biosignatures |
title_full | Fingerprinting Non-Terran Biosignatures |
title_fullStr | Fingerprinting Non-Terran Biosignatures |
title_full_unstemmed | Fingerprinting Non-Terran Biosignatures |
title_short | Fingerprinting Non-Terran Biosignatures |
title_sort | fingerprinting non-terran biosignatures |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6067094/ https://www.ncbi.nlm.nih.gov/pubmed/29634318 http://dx.doi.org/10.1089/ast.2017.1712 |
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