Summary.
Stato- or otoliths are calcified structures in the organ of balance and equilibrium of vertebrates, the inner ear, where they enhance its sensitivity to gravity. The compact otoliths of fish are composed of the calcium carbonate polymorph aragonite and a small fraction of organic molecules. The latter form a protein skeleton which determines the morphology of an otolith as well as its crystal lattice structure. This short review addresses findings according to which the brain obviously plays a prominent role in regulating the mineralisation of fish otoliths and depends on the gravity vector. Overall, otolith mineralisation has thus been identified to be a unique, neuronally guided biomineralisation process. The following is a hypothetical model for regulation of calcification by efferent vestibular neurons: (1) release of calcium at tight junctions in the macular epithelia, (2) macular carbonic anhydrase activity (which in turn is responsible for carbonate deposition), (3) chemical composition of matrix proteins. The rationale and evidence that support this model are discussed.
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Correspondence and reprints: Zoological Institute, University of Hohenheim, Garbenstrasse 30, 70593 Stuttgart, Federal Republic of Germany.
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Anken, R. On the role of the central nervous system in regulating the mineralisation of inner-ear otoliths of fish. Protoplasma 229, 205–208 (2006). https://doi.org/10.1007/s00709-006-0219-6
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DOI: https://doi.org/10.1007/s00709-006-0219-6