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Controlled hydroxyapatite biomineralization in an ~810 million-year-old unicellular eukaryote.


ABSTRACT: Biomineralization marks one of the most significant evolutionary milestones among the Eukarya, but its roots in the fossil record remain obscure. We report crystallographic and geochemical evidence for controlled eukaryotic biomineralization in Neoproterozoic scale microfossils from the Fifteenmile Group of Yukon, Canada. High-resolution transmission electron microscopy reveals that the microfossils are constructed of a hierarchically organized interwoven network of fibrous hydroxyapatite crystals each elongated along the [001] direction, indicating biological control over microstructural crystallization. New Re-Os geochronological data from organic-rich shale directly below the fossil-bearing limestone constrain their age to <810.7 ± 6.3 million years ago. Mineralogical and geochemical variations from these sedimentary rocks indicate that dynamic global marine redox conditions, enhanced by local restriction, may have led to an increase in dissolved phosphate in pore and bottom waters of the Fifteenmile basin and facilitated the necessary geochemical conditions for the advent of calcium phosphate biomineralization.

SUBMITTER: Cohen PA 

PROVIDER: S-EPMC5489269 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Controlled hydroxyapatite biomineralization in an ~810 million-year-old unicellular eukaryote.

Cohen Phoebe A PA   Strauss Justin V JV   Rooney Alan D AD   Sharma Mukul M   Tosca Nicholas N  

Science advances 20170628 6


Biomineralization marks one of the most significant evolutionary milestones among the Eukarya, but its roots in the fossil record remain obscure. We report crystallographic and geochemical evidence for controlled eukaryotic biomineralization in Neoproterozoic scale microfossils from the Fifteenmile Group of Yukon, Canada. High-resolution transmission electron microscopy reveals that the microfossils are constructed of a hierarchically organized interwoven network of fibrous hydroxyapatite crysta  ...[more]

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