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Biology subjects

Backova, L.

Publications and source records attributed to Backova, L..

4 recordsLinked to original sources

PhenoMe: An interactive AI framework for interpretable, microscopy-driven phenotyping

Extracting meaningful biological patterns from microscopy image datasets requires tools that quantitatively connect visual similarities and experimental context. Deep learning models, and in particular novel foundation models, have the capacity to translate images into high-dimensional embeddings that can better represent complex visual patterns. Using these complex representations analytically and linking them to experimental information, it is possible to build advanced exploratory and phenotyping capabilities. Here, we present PhenoMe, an open-source, model-agnostic framework to handle pretrained foundation model-derived image representations alongside quantitative image properties and experimental metadata. PhenoMe integrates multiple scriptable and interactive workflows for embedding space visualisation, dimensionality reduction and clustering, similarity-based comparison and retrieval of representative images for each phenotype, among others. It also supports correlation analyses that link the embedding structure to interpretable image properties. We demonstrate PhenoMe's capabilities on seven public microscopy datasets, ranging from cell painting assays, nanoscale synaptic images, drug-response analyses and dynamic cell-phenotyping. These case studies show how readily available image representations can support data contextualisation, curation and analysis. Through guided notebooks, reproducible configurations, extensible model wrappers and a napari plugin, PhenoMe makes representation-based microscopy exploration accessible to researchers without dedicated technical expertise. PhenoMe lays the groundwork for applying foundation models and representation learning to microscopy data analysis.

bioinformatics↗

Patterned membrane recycling balances apical and lateral cell surfaces to confine tissue deformation under stretch

During development, epithelia undergo large stretches, but how tissues confine the resulting deformations and stresses to specific regions is poorly understood. Here, we show that during Drosophila dorsal closure, the epidermis confines deformation through a developmentally controlled, patterned increase in apical cell surface. Dorsal cells respond to stretch by expanding their apical surface and flattening, whereas ventral cells do not expand nor flatten, even when over-stretched and despite reorganizing their actomyosin. Both shape changes require Rab11-dependent membrane recycling, showing that cell height and apical area are actively controlled rather than passively set by stretch. The Dpp/Brinker pathway restricts this remodeling to the dorsal epidermis. A vertex model shows that localized remodeling is sufficient to pattern tissue deformation and to reduce stresses, including in the ventral, non-remodeling, region. Tissue deformation is thus spatially confined by developmental patterning of the balance between apical and lateral surfaces through membrane recycling, rather than by cytoskeletal forces.

developmental biology↗

Mechanosensitive and Reversible Chromatin-Lamina Dewetting Triggers Cellular Contraction During Wound Healing

Tissue wounding causes rapid mechanical changes in the epithelium, but how these changes affect intracellular organization remains unclear. Using the Drosophila embryonic epidermis, we show that wounding induces a fast, transient compaction of chromatin and its detachment ("dewetting") from the nuclear lamina in about half of the wound-edge cells. Within minutes, chromatin in these cells re-expands and re-associates with the lamina ("re-wetting"). This reversible chromatin-lamina dewetting is mechanosensitive, requiring both the LINC complex and intracellular calcium. During compaction, calcium is stored within chromatin and is later released during ATR-mediated expansion and lamina re-wetting. Chromatin re-expansion then triggers actomyosin contraction and promotes tissue repair through Jun kinase activation, straightening of the wound edge, and supracellular actin ring formation. Together, our findings reveal a multiscale mechanosensitive mechanism by which tissue-scale mechanical changes induce a reversible chromatin-lamina dewetting, leading to cellular contraction and initiation of tissue repair.

cell biology↗

BiaPy: A unified framework for versatile bioimage analysis with deep learning

BiaPy is an open-source library and application that streamlines the use of common deep learning approaches for bioimage analysis. Designed to simplify technical complexities, it offers an intuitive interface, zero-code notebooks, and Docker integration, catering to both users and developers. While focused on deep learning workflows for 2D and 3D image data, it enhances performance with multi-GPU capabilities, memory optimization, and scalability for large datasets. Although BiaPy does not encompass all aspects of bioimage analysis, such as visualization and manual annotation tools, it empowers researchers by providing a ready-to-use environment with customizable templates that facilitate sophisticated bioimage analysis workflows.

bioinformatics↗