Cited by 975Paleontology and Stratigraphy of FossilsPhotosynthetic Processes and MechanismsOrigins and Evolution of Life

2-Methylhopanoids as biomarkers for cyanobacterial oxygenic photosynthesis

Summons, Roger E., Jahnke, Linda L., Hope, Janet M., Logan, Graham A.·1999·Nature

Abstract

Oxygenic photosynthesis is widely accepted as the most important bioenergetic process happening in Earth's surface environment. It is thought to have evolved within the cyanobacterial lineage, but it has been difficult to determine when it began. Evidence based on the occurrence and appearance of stromatolites and microfossils indicates that phototrophy occurred as long ago as 3,465 Myr although no definite physiological inferences can be made from these objects. Carbon isotopes and other geological phenomena provide clues but are also equivocal. Biomarkers are potentially useful because the three domains of extant life-Bacteria, Archaea and Eukarya-have signature membrane lipids with recalcitrant carbon skeletons. These lipids turn into hydrocarbons in sediments and can be found wherever the record is sufficiently well preserved. Here we show that 2-methyl-bacteriohopanepolyols occur in a high proportion of cultured cyanobacteria and cyanobacterial mats. Their 2-methylhopane hydrocarbon derivatives are abundant in organic-rich sediments as old as 2,500 Myr. These biomarkers may help constrain the age of the oldest cyanobacteria and the advent of oxygenic photosynthesis. They could also be used to quantify the ecological importance of cyanobacteria through geological time.

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Crossref · 10.1038/23005

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  • The chemical breakdown (diagenesis) of some biomolecules produces recognizable compounds that are preserved long-term, often called molecular fossils.

    “However, the chemical breakdown (diagenesis) of some biomolecules produces recognizable compounds that are preserved long-term. These breakdown products are often dubbed “molecular fossils” (Brocks et al., 1999; Summons et al., 1999).”

    From The Astrobiology Primer v2.0 (2016) · cites this paper as Summons et al., 1999

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Authors
Summons, R. E., Jahnke, L. L., Hope, J. M., & Logan, G. A.
Corresponding author
Summons, Roger E.
Venue
Nature
Published
1999-08
Volume
400
Issue
6744
Pages
554-557
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1532877896
Cited by
975
References
0
Citations by year
2026: 19 · 2025: 24 · 2024: 23 · 2023: 24 · 2022: 37 · 2021: 27 · 2020: 35 · 2019: 28 · 2018: 35 · 2017: 39 · 2016: 29 · 2015: 33 · 2014: 34 · 2013: 42 · 2012: 60
FWCI
26.27
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
Keywords
cyanobacteria, oxygenic photosynthesis, biomarkers, origin of photosynthesis, cyanobacterial mats, organic-rich sediments, membrane lipids, stromatolites, phototrophy, early Earth
MeSH terms
Cyanobacteria, Fossils, Gas Chromatography-Mass Spectrometry, Oxygen, Photosynthesis, Triterpenes, Biomarkers, Lipid Metabolism

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