Biomarkers: Informative Molecules for Studies in Geobiology

Summons, Roger E.; Lincoln, Sara A.

doi:10.1002/9781118280874.ch15

Cited by 27 publications

(15 citation statements)

References 245 publications

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“…Due to the sparse preservation of physical remains, very little is known about organismic diversity, and especially, the environmental prevalence of eukaryotic algae, in the period between these events, i.e., roughly covering the late Mesoproterozoic Era and Tonian Period. In contrast to acritarch microfossils, which evade exact taxonomic classification and which do not provide contextual environmental details, the sedimentary hydrocarbon remnants of biologically produced lipids can present a wealth of information on microbial diversity and environmental conditions during deposition and early diagenesis (e.g., Summons and Lincoln, 2012). But for the aforementioned period that lies between the first occurrence of undisputed eukaryotic microfossils (1.49 Ga, Roper Group) and the oldest detection of unambiguously syngenetic eukaryotic steranes (ca.…”

Section: Introductionmentioning

confidence: 95%

Comparative microbial diversity and redox environments of black shale and stromatolite facies in the Mesoproterozoic Xiamaling Formation

Luo

Hallmann

Xie

et al. 2015

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 95%

Comparative microbial diversity and redox environments of black shale and stromatolite facies in the Mesoproterozoic Xiamaling Formation

Luo

Hallmann

Xie

et al. 2015

Geochimica et Cosmochimica Acta

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“…Hopanoids are bacterial membrane lipids ubiquitous in modern day environments dominated by microbes and readily preserved in ancient sedimentary rock (Ourisson and Albrecht, 1992), making them ideal tools for reconstructing and understanding microbial ecosystems (Brocks et al, 2004;Summons and Lincoln, 2012). Due to size and structural similarities, hopanoids are considered bacterial surrogates of eukaryotic sterols, possibly regulating the fluidity and permeability of the bacterial membrane (Ourisson et al, 1987;Kannenberg and Poralla, 1999).…”

Section: Introductionmentioning

confidence: 99%

Elucidation of the Burkholderia cenocepacia hopanoid biosynthesis pathway uncovers functions for conserved proteins in hopanoid‐producing bacteria

Schmerk

Welander

Hamad

et al. 2014

Environmental Microbiology

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This is the pre-peer reviewed version of the following article: Schmerk, C. L., Welander, P. V., Hamad, M. A., Bain, K. L., Bernards, M. A., Summons, R. E. and Valvano, M. A. (2015), Elucidation of the Burkholderia cenocepacia hopanoid biosynthesis pathway uncovers functions for conserved proteins in hopanoid-producing bacteria. Environmental Microbiology, 17: 735-750, which has been published in final form at http://onlinelibrary.wiley.com/wol1/doi/10.1111/1462-2920.12509/abstract. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. General rightsCopyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights.Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact openaccess@qub.ac.uk. grow under any stress condition tested, whereas ΔhpnI, ΔhpnJ, and ΔhpnK displayed wild type 42 growth rates when exposed to detergent, but varying levels of sensitivity to low pH and 43 polymyxin B. This study not only elucidates the biosynthetic pathway of hopanoids in B. 44 cenocepacia, but also uncovers a biosynthetic role for the conserved proteins HpnI, HpnJ, and 45

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“…These molecules encode diagnostic signatures via their chain lengths, and patterns of unsaturation and branching (Dowling et al ., ; White & Ringelberg, ). Polycyclic terpenoids, such as steroids (Volkman, , ) and hopanoids (Rohmer et al ., ; Talbot & Farrimond, ; Handley et al ., ), are well established as excellent biomarkers and can be found in sediments from the present day extending back to billions of years (Summons & Lincoln, ).…”

Section: Introductionmentioning

confidence: 99%

Molecular indicators of microbial diversity in oolitic sands of Highborne Cay, Bahamas

et al. 2013

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Microbialites (stromatolites and thrombolites) are mineralized mat structures formed via the complex interactions of diverse microbial-mat communities. At Highborne Cay, in the Bahamas, the carbonate component of these features is mostly comprised of ooids. These are small, spherical to ellipsoidal grains characterized by concentric layers of calcium carbonate and organic matter and these sand-sized particles are incorporated with the aid of extra-cellular polymeric substances (EPS), into the matrix of laminated stromatolites and clotted thrombolite mats. Here, we present a comparison of the bacterial diversity within oolitic sand samples and bacterial diversity previously reported in thrombolitic and stromatolitic mats of Highborne Cay based on analysis of clone libraries of small subunit ribosomal RNA gene fragments and lipid biomarkers. The 16S-rRNA data indicate that the overall bacterial diversity within ooids is comparable to that found within thrombolites and stromatolites of Highborne Cay, and this significant overlap in taxonomic groups suggests that ooid sands may be a source for much of the bacterial diversity found in the local microbialites. Cyanobacteria were the most diverse taxonomic group detected, followed by Alphaproteobacteria, Gammaproteobacteria, Planctomyces, Deltaproteobacteria, and several other groups also found in mat structures. The distributions of intact polar lipids, the fatty acids derived from them, and bacteriohopanepolyols provide broad general support for the bacterial diversity identified through analysis of nucleic acid clone libraries.

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Biomarkers: Informative Molecules for Studies in Geobiology

Cited by 27 publications

References 245 publications

Comparative microbial diversity and redox environments of black shale and stromatolite facies in the Mesoproterozoic Xiamaling Formation

Comparative microbial diversity and redox environments of black shale and stromatolite facies in the Mesoproterozoic Xiamaling Formation

Elucidation of the Burkholderia cenocepacia hopanoid biosynthesis pathway uncovers functions for conserved proteins in hopanoid‐producing bacteria

Molecular indicators of microbial diversity in oolitic sands of Highborne Cay, Bahamas

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