Abstract
Fossilized lipids preserved in sedimentary rocks offer singular insights into the Earth’s palaeobiology. These ‘biomarkers’ encode information pertaining to the oxygenation of the atmosphere and oceans, transitions in ocean plankton, the greening of continents, mass extinctions and climate change. Historically, biomarker interpretations relied on inventories of lipids present in extant microorganisms and counterparts in natural environments. However, progress has been impeded because only a small fraction of the Earth’s microorganisms can be cultured, many environmentally significant microorganisms from the past no longer exist and there are gaping holes in knowledge concerning lipid biosynthesis. The revolution in genomics and bioinformatics has provided new tools to expand our understanding of lipid biomarkers, their biosynthetic pathways and distributions in nature. In this Review, we explore how preserved organic molecules provide a unique perspective on the history of the Earth’s microbial life. We discuss how advances in molecular biology have helped elucidate biomarker origins and afforded more robust interpretations of fossil lipids and how the rock record provides vital calibration points for molecular clocks. Such studies are open to further exploitation with the expansion of sequenced microbial genomes in accessible databases.
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Acknowledgements
This work was supported by a grant from the Simons Collaboration on the Origin of Life through an award (290361FY18) to R.E.S. and by National Science Foundation awards (1752564) to P.V.W and (2044871) to D.A.G.
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Glossary
- Warrawoona Group
-
A geological unit in Western Australia that includes the remains of microorganisms as old as 3.46 billion years.
- Pilbara Craton
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An ancient fragment of continental crust in Western Australia that includes rocks as old as 3.6 billion years.
- Stromatolites
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Layered sedimentary structures that form when a microbial community traps and binds sediment grains.
- Hopanoids
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A class of molecules comprising six C5 isoprene units folded into a pentacyclic ring system.
- Accessory pigment
-
A coloured molecule that absorbs light and works in concert with the primary pigment, typically chlorophyll a.
- Sedimentary diagenesis
-
The processes by which sedimentary rocks and their components became modified over time during burial.
- Carbonaceous chondrites
-
Carbon-rich meteorites composed of small mineral grains and representing some of the post-primitive material in the solar system.
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Summons, R.E., Welander, P.V. & Gold, D.A. Lipid biomarkers: molecular tools for illuminating the history of microbial life. Nat Rev Microbiol 20, 174–185 (2022). https://doi.org/10.1038/s41579-021-00636-2
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DOI: https://doi.org/10.1038/s41579-021-00636-2