Super-resolution imaging based on single-molecule localization has been developed for more than a decade. These techniques can break through diffraction limit of fluorescent microscopy and initially improve the resolution by an order of magnitude to ~20 nm, by introducing photoactivatable/photoswitching probes and centroid fitting method. As the demand of biological research, the localization precision of single-molecules was further improved by several state-of-the-art methods in the past several years. This review focuses on the latest developed techniques which have greatly improved the performance of single-molecule localization microscopy, from measurement principle to hardware design. These methods are essential for the study of nanostructures and biomacromolecule dynamics inside of cells.
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http://dx.doi.org/10.52601/bpr.2021.210023 | DOI Listing |
Alzheimers Dement
December 2024
Dementia Research Centre, UCL Queen Square Institute of Neurology, London, United Kingdom.
Background: Accelerated long-term forgetting (ALF) is a form of episodic memory impairment where information is retained normally over 30-60 minutes but lost at an accelerated rate over subsequent days to weeks, and is a very early - perhaps the earliest - cognitive change in both autosomal dominant and sporadic Alzheimer's disease (AD). However, the neuroanatomical changes underlying ALF in AD have remained elusive. We explored associations between ALF and focal cortical thickness in presymptomatic autosomal dominant AD (ADAD).
View Article and Find Full Text PDFNat Commun
January 2025
Laboratory of Single Molecule Biology, Graduate School of Science and Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita, Osaka, 565-0871, Japan.
Excitable systems of eukaryotic chemotaxis can generate asymmetric signals of Ras-GTP-enriched domains spontaneously to drive random cell migration without guidance cues. However, the molecules responsible for the spontaneous signal generation remain elusive. Here, we characterized RasGEFs encoded in Dictyostelium discoideum by live-cell imaging of the spatiotemporal dynamics of Ras-GTP and hierarchical clustering, finding that RasGEFX is primarily required for the spontaneous generation of Ras-GTP-enriched domains and is essential for random migration in combination with RasGEFB/M/U in starved cells, and they are dispensable for chemotaxis to chemoattractant cAMP.
View Article and Find Full Text PDFElife
January 2025
Institute of Parasitology, Faculty of Agricultural and Environmental Sciences, McGill University, Montreal, Canada.
Paramyxovirus membrane fusion requires an attachment protein for receptor binding and a fusion protein for membrane fusion triggering. Nipah virus (NiV) attachment protein (G) binds to ephrinB2 or -B3 receptors, and fusion protein (F) mediates membrane fusion. NiV-F is a class I fusion protein and is activated by endosomal cleavage.
View Article and Find Full Text PDFMethods Mol Biol
January 2025
Institut de Génomique Fonctionnelle de Lyon (IGFL), UMR5242, Ecole Normale Supérieure de Lyon (ENSL), CNRS, Université de Lyon, Lyon, France.
Bimolecular Fluorescence Complementation (BiFC) is a powerful molecular imaging method used to visualize protein-protein interactions (PPIs) in living cells or organisms. BiFC is based on the reassociation of hemi-fragments of a monomeric fluorescent protein upon spatial proximity. It is compatible with conventional light microscopy, providing a resolution that is constrained by the diffraction of light to around 250 nm.
View Article and Find Full Text PDFAlzheimers Res Ther
December 2024
Faculty of Health, Medicine and Life Sciences, Mental Health and Neuroscience Research Institute, Alzheimer Centre Limburg, Maastricht University, Maastricht, The Netherlands.
Background: Although separate lines of research indicated a moderating role of sex in both sleep-wake disruption and in the interindividual vulnerability to Alzheimer's disease (AD)-related processes, the quantification of sex differences in the interplay between sleep-wake dysregulation and AD pathology remains critically overlooked. Here, we examined sex-specific associations between circadian rest-activity patterns and AD-related pathophysiological processes across the adult lifespan.
Methods: Ninety-two cognitively unimpaired adults (mean age = 59.
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