Diatom Adhesion and Motility

Poulsen, Nicole; Davutoglu, Metin Gabriel; Suchanova, Jirina Zackova

doi:10.1007/978-3-030-92499-7_14

Cited by 12 publications

(11 citation statements)

References 133 publications

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“…The available data on diatom motility do not distinguish between force generation through actomyosin motors and EPS polymerization 15,16 . Our force measurements tend to support the former model.…”

Section: Discussionmentioning

confidence: 99%

“…This arrangement supports a model of motility where myosin motors exert pushing forces on the extracellular EPS through a transmembrane protein 23 . However, this protein has yet to be identified, and since actin is likely to be required for EPS secretion 24,25 , an alternative model where force is generated from EPS polymerization has not been excluded 15,16 .…”

Section: Introductionmentioning

confidence: 99%

“…A group of pennate diatoms latter evolved a fine longitudinal slit through the frustule known as the raphe. These raphid pennate diatoms can move using a lineage-specific form of gliding motility 15,16 , and have undergone substantial evolutionary radiation to comprise the most species-rich and diverse lineage of diatoms 9 .…”

Section: Introductionmentioning

confidence: 99%

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Cooperative Motility, Force Generation and Mechanosensing in a Foraging Non-Photosynthetic Diatom

Zheng

Kumadaki

Quek

et al. 2023

Preprint

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Diatoms are ancestrally photosynthetic microalgae. However, some underwent a major evolutionary transition, losing photosynthesis to become obligate heterotrophs. The molecular and physiological basis for this transition is unclear. Here, we isolate and characterize new strains of non-photosynthetic diatoms from the coastal waters of Singapore. These diatoms occupy diverse ecological niches and display glucose-mediated catabolite repression, a classical feature of bacterial and fungal heterotrophs. Live-cell imaging reveals deposition of secreted extracellular polymeric substance (EPS). Diatoms moving on pre-existing EPS trails (runners) move faster than those laying new trails (blazers). This leads to cell-to-cell coupling where runners can push blazers to make them move faster. Calibrated micropipettes measure substantial single cell pushing forces, which are consistent with high-order myosin motor cooperativity. Collisions that impede forward motion induce reversal, revealing navigation-related force sensing. Together, these data identify aspects of metabolism and motility that are likely to facilitate and underpin the transition to obligate heterotrophy.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cooperative Motility, Force Generation and Mechanosensing in a Foraging Non-Photosynthetic Diatom

Zheng

Kumadaki

Quek

et al. 2023

Preprint

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“…The illumination of these cells generates PJs at the shadow side, which are assumed to be perceived by a putative, well-distributed network of photoreceptors fixed on the plasma membrane, triggering a cellular signal transduction cascade ending by the flagella movement toward or outward from the light (see Figure 5 in [ 113 ]). However, unlike Synechocystis sp., the motility in raphid pennate diatoms, and, thus, GP, does not involve a flagellum, but rather gliding motility through the secretion of mucilage from their raphe slits [ 115 , 116 ].…”

Section: Discussionmentioning

confidence: 99%

Numerical Analysis of the Light Modulation by the Frustule of Gomphonema parvulum: The Role of Integrated Optical Components

et al. 2022

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Siliceous diatom frustules present a huge variety of shapes and nanometric pore patterns. A better understanding of the light modulation by these frustules is required to determine whether or not they might have photobiological roles besides their possible utilization as building blocks in photonic applications. In this study, we propose a novel approach for analyzing the near-field light modulation by small pennate diatom frustules, utilizing the frustule of Gomphonema parvulum as a model. Numerical analysis was carried out for the wave propagation across selected 2D cross-sections in a statistically representative 3D model for the valve based on the finite element frequency domain method. The influences of light wavelength (vacuum wavelengths from 300 to 800 nm) and refractive index changes, as well as structural parameters, on the light modulation were investigated and compared to theoretical predictions when possible. The results showed complex interference patterns resulting from the overlay of different optical phenomena, which can be explained by the presence of a few integrated optical components in the valve. Moreover, studies on the complete frustule in an aqueous medium allow the discussion of its possible photobiological relevance. Furthermore, our results may enable the simple screening of unstudied pennate frustules for photonic applications.

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“…The gliding motion observed in diatoms is unique among microbial eukaryotes, as it does not involve swimming, use of additional appendages, or alteration of cell shape (Poulsen et al 2022). Instead, the force for the gliding mechanism is hypothesized to be driven by an actin-myosin based system (Edgar andPickett-Heaps 1984, Wetherbee et al 1998).…”

mentioning

confidence: 99%

Gliding toward new discoveries in diatom adhesion and motility

Abbriano

2023

Journal of Phycology

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Diatom Adhesion and Motility

Cited by 12 publications

References 133 publications

Cooperative Motility, Force Generation and Mechanosensing in a Foraging Non-Photosynthetic Diatom

Cooperative Motility, Force Generation and Mechanosensing in a Foraging Non-Photosynthetic Diatom

Numerical Analysis of the Light Modulation by the Frustule of Gomphonema parvulum: The Role of Integrated Optical Components

Gliding toward new discoveries in diatom adhesion and motility

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