Polysphaeroides filiformis, a proterozoic cyanobacterial microfossil and implications for cyanobacteria evolution.

Autor:	Demoulin CF; Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium., Sforna MC; Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium.; Centre de Biophysique Moléculaire, (UPR CNRS 4301), 45071 Orléans, France., Lara YJ; Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium., Cornet Y; Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium., Somogyi A; Synchrotron Soleil, 91190 Saint-Aubin - BP 48, France., Medjoubi K; Synchrotron Soleil, 91190 Saint-Aubin - BP 48, France., Grolimund D; Paul Scherrer Institut, Swiss Light Source, 5232 Villigen PSI, Switzerland., Sanchez DF; Paul Scherrer Institut, Swiss Light Source, 5232 Villigen PSI, Switzerland., Tachoueres RT; ESRF-The European Synchrotron, 38000 Grenoble, France., Addad A; Unité Matériaux et Transformations (UMR CNRS 8207), Université Lille 1 - Sciences et Technologies, 59650 Villeneuve d'Ascq, France., Fadel A; Unité Matériaux et Transformations (UMR CNRS 8207), Université Lille 1 - Sciences et Technologies, 59650 Villeneuve d'Ascq, France., Compère P; Functional and Evolutive Morphology, UR FOCUS, and Center for Applied Research and Education in Microscopy (CAREM-ULiege), University of Liège, 4000 Liège, Belgium., Javaux EJ; Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium.
Jazyk:	angličtina
Zdroj:	IScience [iScience] 2024 Jan 11; Vol. 27 (2), pp. 108865. Date of Electronic Publication: 2024 Jan 11 (Print Publication: 2024).
DOI:	10.1016/j.isci.2024.108865
Abstrakt:	Deciphering the fossil record of cyanobacteria is crucial to understand their role in the chemical and biological evolution of the early Earth. They profoundly modified the redox conditions of early ecosystems more than 2.4 Ga ago, the age of the Great Oxidation Event (GOE), and provided the ancestor of the chloroplast by endosymbiosis, leading the diversification of photosynthetic eukaryotes. Here, we analyze the morphology, ultrastructure, chemical composition, and metals distribution of Polysphaeroides filiformis from the 1040-1006 Ma Mbuji-Mayi Supergroup (DR Congo). We evidence trilaminar and bilayered ultrastructures for the sheath and the cell wall, respectively, and the preservation of Ni-tetrapyrrole moieties derived from chlorophyll in intracellular inclusions. This approach allows an unambiguous interpretation of P. filiformis as a branched and multiseriate photosynthetic cyanobacterium belonging to the family of Stigonemataceae. It also provides a possible minimum age for the emergence of multiseriate true branching nitrogen-fixing and probably heterocytous cyanobacteria. Competing Interests: The authors declare no competing interests. (© 2024 The Author(s).)
Databáze:	MEDLINE
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