+ Most Popular
Cunninghamia lanceolata plantations in China
Mammalian lairs in paleo ecological studies and palynology
Studies on technological possibilities in utilization of anhydrous milk fat for production of recombined butter-like products
Should right-sided fibroelastomas be operated upon?
Large esophageal lipoma
Apoptosis in the mammalian thymus during normal histogenesis and under various in vitro and in vivo experimental conditions
Poissons characoides nouveaux ou non signales de l'Ilha do Bananal, Bresil
Desensitizing efficacy of Colgate Sensitive Maximum Strength and Fresh Mint Sensodyne dentifrices
Administration of fluid by subcutaneous infusion: revival of a forgotten method
Tundra mosquito control - an impossible dream?
Schizophrenia for primary care providers: how to contribute to the care of a vulnerable patient population
Geochemical pattern analysis; method of describing the Southeastern limestone regional aquifer system
Incidence of low birth weights in a hospital of Mexico City
Graded management intensity of grassland systems for enhancing floristic diversity
Microbiology and biochemistry of cheese and fermented milk
The ember tetra: a new pygmy characid tetra from the Rio das Mortes, Brazil, Hyphessobrycon amandae sp. n. (Pisces, Characoidei)
Risk factors of contrast-induced nephropathy in patients after coronary artery intervention
Renovation of onsite domestic wastewater in a poorly drained soil
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Systolic blood pressure in a population of infants in the first year of life: the Brompton study
Haematological studies in rats fed with metanil yellow
Studies on pasteurellosis. I. A new species of Pasteurella encountered in chronic fowl cholera
Dormancy breaking and germination of Acacia salicina Lindl. seeds
therapy of lupus nephritis. a two-year prospective study

Fossil microbial shark tooth decay documents in situ metabolism of enameloid proteins as nutrition source in deep water environments

Fossil microbial shark tooth decay documents in situ metabolism of enameloid proteins as nutrition source in deep water environments

Scientific Reports 10(1): 20979

ISSN/ISBN: 2045-2322

PMID: 33262401

DOI: 10.1038/s41598-020-77964-5

Alteration of organic remains during the transition from the bio- to lithosphere is affected strongly by biotic processes of microbes influencing the potential of dead matter to become fossilized or vanish ultimately. If fossilized, bones, cartilage, and tooth dentine often display traces of bioerosion caused by destructive microbes. The causal agents, however, usually remain ambiguous. Here we present a new type of tissue alteration in fossil deep-sea shark teeth with in situ preservation of the responsible organisms embedded in a delicate filmy substance identified as extrapolymeric matter. The invading microorganisms are arranged in nest- or chain-like patterns between fluorapatite bundles of the superficial enameloid. Chemical analysis of the bacteriomorph structures indicates replacement by a phyllosilicate, which enabled in situ preservation. Our results imply that bacteria invaded the hypermineralized tissue for harvesting intra-crystalline bound organic matter, which provided nutrient supply in a nutrient depleted deep-marine environment they inhabited. We document here for the first time in situ bacteria preservation in tooth enameloid, one of the hardest mineralized tissues developed by animals. This unambiguously verifies that microbes also colonize highly mineralized dental capping tissues with only minor organic content when nutrients are scarce as in deep-marine environments.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 071795151

Download citation: RISBibTeXText

Related references

Strontium isotope age-dating of fossil shark tooth enameloid from the Upper Cretaceous Strata of Alabama and Mississippi, USA. Cretaceous Research 62: 1-12, 2016

Shark tooth morphogenesis. An SEM and EDX analysis of enameloid and dentin development in various shark species. Journal de Biologie Buccale 18(3): 237-248, 1990

Organic components in enameloid of extant and fossil shark teeth. Transactions and Proceedings of the Palaeontological Society of Japan New Series 1995(179): 169-174, 1995

Ultrastructural organization and micromechanical properties of shark tooth enameloid. Acta Biomaterialia 10(9): 3959-3968, 2014

Tooth enameloid as a taxonomic criterion; 1, A new euselachian shark from the Rhaetic-Liassic boundary. Neues Jahrbuch fuer Geologie und Palaeontologie Monatshefte 9: 565-576, 1977

Tooth enameloid as a taxonomic criterion; 3, A new primitive shark family from the lower Keuper. Neues Jahrbuch fuer Geologie und Palaeontologie Abhandlungen 1601: 61-72, 1980

Shape-preserving erosion controlled by the graded microarchitecture of shark tooth enameloid. Nature Communications 11(1): 5971, 2020

Hierarchical Microstructure of Tooth Enameloid in two Lamniform Shark Species, Carcharias taurus and Isurus oxyrinchus. Nanomaterials 11(4), 2021

Tooth enameloid as a taxonomic criterion; 2, Is Dalatias barnstonensis Sykes, 1971 (Triassic, England) a squalomorphic shark?. Neues Jahrbuch fuer Geologie und Palaeontologie Monatshefte 1: 42-58, 1978

Mineral specific proteins and their organization in shark enameloid. Journal of Dental Research: 391, 1988

Isolation of enamelinlike proteins from blue shark (Prionace glauca) enameloid. Journal of Experimental Zoology 234(2): 185-191, 1985

Deep sea sharks and squalene. 1. Notes on the basking shark and ragged-tooth shark. PACIFIC SCIENCE CONGRESS PROCEEDINGS 14(1): 50-53, 1981

Tooth enameloid formation of a fish (Hoplognathus fasciatus). Chronological relationship of matrix formation and mineralization of the enameloid and dentin. Journal of Nihon University School of Dentistry 14(1): 1-11, 1972

A comparative infrared spectroscopic study of hydroxide and carbonate absorption bands in spectra of shark enameloid, shark dentin, and a geological apatite. Calcified Tissue International 65(6): 459-465, 1999

Fossil cow shark's tooth. Poirieria e; 18: 49, 1996