A Critical Re-Evaluation of "Bridging Single Cells to Organs: Mesoscale Modules as Fundamental Units of Tissue Function" by Chen et al., Cell 2025; doi: 10.1016/j.cell.2025.10.012

This commentary provides an in-depth and critical evaluation of the study “Bridging single cells to organs: Mesoscale modules as fundamental units of tissue function” by Chen et al., Cell (2025). The original paper proposes an ambitious multiscale framework in which mesoscale modules—intermediate, spatially coherent multicellular structures—serve as the fundamental organizational units linking single-cell states to emergent tissue-level physiology. While the concept represents an important departure from exclusively cell-centric or organ-centric models, its empirical and theoretical foundations require careful assessment. This commentary examines the study across conceptual, methodological, computational, and translational dimensions, providing a balanced evaluation of both its innovations and limitations. The analysis first contextualizes mesoscale biology within contemporary spatial and systems biology, emphasizing the need for integrative models that capture structural coherence, dynamic behavior, and functional coordination across scales. It then summarizes the core contributions of Chen et al., including their multimodal integration of spatial transcriptomics, single-cell profiling, and high-resolution imaging to reconstruct mesoscale modules in diverse tissues. The commentary highlights conceptual strengths—such as the formulation of mesoscale modularity as a unifying framework—while also critically examining methodological challenges, including static sampling, sensitivity to computational parameters, and the lack of perturbation-based mechanistic validation. A comprehensive figure-by-figure critique evaluates the validity of the visual evidence presented in the main figures, extended data, and supplementary materials. Particular attention is given to issues of biological interpretability, statistical robustness, missing controls, inappropriate generalization, and algorithmic artifacts. The commentary also explores the broader implications of mesoscale modularity for developmental biology, homeostasis, pathophysiology, tissue engineering, precision medicine, and multiscale therapeutic strategies. Key limitations identified include the absence of longitudinal data demonstrating true module dynamics, insufficient analysis of gradient-based tissues, unclear causal mechanisms underlying module formation, and limited cross-species validation. The commentary outlines detailed future directions—including dynamic imaging, mechanical and biochemical perturbations, uncertainty-aware computational models, and integration of additional modalities such as spatial proteomics and biomechanics. Overall, this work provides the most comprehensive independent assessment to date of the mesoscale module framework proposed by Chen et al. It serves as a resource for researchers seeking to understand the strengths, constraints, and translational potential of mesoscale biology as an emerging paradigm in tissue organization.