Quantitative assessment of inner ear variation in elasmobranchs

Sauer, Derek J.; Radford, Craig A.; Mull, Christopher G.; Yopak, Kara E.

doi:10.1038/s41598-023-39151-0

Cited by 4 publications

(1 citation statement)

References 122 publications

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“…MRI also allows to investigate damage to the myelin sheath, making it possible to study the different water pools in complex macromolecular environments (van der Weijden et al, 2023). This, like MR microscopy (Pooh et al, 2011), chemical exchange saturation transfer (CEST) MRI (Maralani et al, 2023), or DW-MRI for determining microscopic tumor spread (Shusharina and Nguyen, 2023), could increasingly benefit to marine biology, as shown recently (Chanet et al, 2023;Sauer et al, 2023;Gerussi et al, 2024).…”

Section: Lessons From the Oceansmentioning

confidence: 99%

The biophysics of water in cell biology: perspectives on a keystone for both marine sciences and cancer research

Pouliquen

2024

Front. Cell Dev. Biol.

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The biophysics of water, has been debated over more than a century. Although its importance is still underestimated, significant breakthroughs occurred in recent years. The influence of protein condensation on water availability control was documented, new findings on water-transport proteins emerged, and the way water molecules rearrange to minimize free energy at interfaces was deciphered, influencing membrane thermodynamics. The state of knowledge continued to progress in the field of deep-sea marine biology, highlighting unknown effects of high hydrostatic pressure and/or temperature on interactions between proteins and ligands in extreme environments, and membrane structure adaptations. The role of osmolytes in protein stability control under stress is also discussed here in relation to fish egg hydration/buoyancy. The complexity of water movements within the cell is updated, all these findings leading to a better view of their impact on many cellular processes. The way water flow and osmotic gradients generated by ion transport work together to produce the driving force behind cell migration is also relevant to both marine biology and cancer research. Additional common points concern water dynamic changes during the neoplastic transformation of cells and tissues, or embryo development. This could improve imaging techniques, early cancer diagnosis, and understanding of the molecular and physiological basis of buoyancy for many marine species.

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Section: Lessons From the Oceansmentioning

confidence: 99%

The biophysics of water in cell biology: perspectives on a keystone for both marine sciences and cancer research

Pouliquen

2024

Front. Cell Dev. Biol.

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Skeletal labyrinth morphology of four species of living elasmobranchs

Neal,

Rodrigues,

Denton

et al. 2024

The Anatomical Record

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Despite detailed descriptions of cranial anatomy in representatives of most major chondrichthyan groups, the inner ear has been described infrequently and most often from the soft tissue of the membranous labyrinth. However, skeletal labyrinth morphology has been linked with ecology in several groups of vertebrates, and shark skeletal labyrinths bear several specializations for detecting low frequency sounds. Without description of these structures across a broad sample of taxa, future exploration of the ecomorphology of ear shape is not possible. We used high‐resolution CT scanning to generate three‐dimensional models of the endocranial anatomy in four elasmobranchs: the Nurse Shark (Ginglymostoma cirratum), the Japanese Tope Shark (Hemitriakis japanica), the Horn Shark (Heterodontus francisci), and the Zebra Shark (Stegostoma tigrinum). Major differences are apparent between the skeletal labyrinths of these taxa, which might be ascribed to either phylogenetic history or lifestyle. In particular, the size of the skeletal labyrinth relative to the cranium dramatically differs among these chondrichthyans, as does the diameter and angle of the semicircular canals and the size of the canals relative to the vestibule. Based on the separation of the anterior and posterior semicircular canals, and the lack thereof in S. tigrinum, the degree of specialization for low frequency sound detection may also vary.

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From the morphospace to the soundscape: Exploring the diversity and functional morphology of the fish inner ear, with a focus on elasmobranchs

Chapuis,

Yopak,

Radford

2023

The Journal of the Acoustical Society of America

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Fishes, including elasmobranchs (sharks, rays, and skates), present an astonishing diversity in inner ear morphologies; however, the functional significance of these variations and how they confer auditory capacity is yet to be resolved. The relationship between inner ear structure and hearing performance is unclear, partly because most of the morphological and biomechanical mechanisms that underlie the hearing functions are complex and poorly known. Here, we present advanced opportunities to document discontinuities in the macroevolutionary trends of a complex biological form, like the inner ear, and test hypotheses regarding what factors may be driving morphological diversity. Three-dimensional (3D) bioimaging, geometric morphometrics, and finite element analysis are methods that can be combined to interrogate the structure-to-function links in elasmobranch fish inner ears. In addition, open-source 3D morphology datasets, advances in phylogenetic comparative methods, and methods for the analysis of highly multidimensional shape data have leveraged these opportunities. Questions that can be explored with this toolkit are identified, the different methods are justified, and remaining challenges are highlighted as avenues for future work.

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Quantitative assessment of inner ear variation in elasmobranchs

Cited by 4 publications

References 122 publications

The biophysics of water in cell biology: perspectives on a keystone for both marine sciences and cancer research

The biophysics of water in cell biology: perspectives on a keystone for both marine sciences and cancer research

Skeletal labyrinth morphology of four species of living elasmobranchs

From the morphospace to the soundscape: Exploring the diversity and functional morphology of the fish inner ear, with a focus on elasmobranchs

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