Primordial magnetotaxis in putative giant paleoproterozoic magnetofossils.

Autor:	Donardelli Bellon U; Department of Geophysics, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo 05360020, Brazil.; Department of Geophysics, School of Geosciences, University of Edinburgh, Edinburgh EH9 3FE, Scotland., Williams W; Department of Geophysics, School of Geosciences, University of Edinburgh, Edinburgh EH9 3FE, Scotland., Trindade RIF; Department of Geophysics, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo 05360020, Brazil., Maldanis L; Earth Science Department, Vrije Universiteit Amsterdam, Amsterdam 1081 HV, the Netherlands., Galante D; Department of Sedimentary and Environmental Geology, Institute of Geosciences, University of São Paulo, São Paulo 05508080, Brazil.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2024 Jun 04; Vol. 121 (23), pp. e2319148121. Date of Electronic Publication: 2024 May 28.
DOI:	10.1073/pnas.2319148121
Abstrakt:	Magnetotactic bacteria produce chains of nanoscopic iron minerals used for navigation, which can be preserved over geological timescales in the form of magnetofossils. Micrometer-sized magnetite crystals with unusual shapes suggesting a biologically controlled mineralization have been found in the geological record and termed giant magnetofossils. The biological origin and function of giant magnetofossils remains unclear, due to the lack of modern analogues to giant magnetofossils. Using distinctive Ptychographic nanotomography data of Precambrian (1.88 Ga) rocks, we recovered the morphology of micrometric cuboid grains of iron oxides embedded in an organic filamentous fossil to construct synthetic magnetosomes. Their morphology is different from that of previously found giant magnetofossils, but their occurrence in filamentous microfossils and micromagnetic simulations support the hypothesis that they could have functioned as a navigation aid, akin to modern magnetosomes. Competing Interests: Competing interests statement:The authors declare no competing interest.
Databáze:	MEDLINE
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