Refining Mouse Models of Gaucher Disease: Advancing Mechanistic Insights, Biomarker Discovery, and Therapeutic Strategies.

Gaucher disease (GD), caused by biallelic pathogenic variants in GBA1, has evolved from being understood as a macrophage-restricted lysosomal disorder to a multisystem condition involving neuroinflammation, immune dysregulation, and cell-type-specific lipid toxicity. This expanded view has driven a parallel progression in GD mouse model development. Early chemically induced and germline knockout models provided foundational insights but were limited by perinatal lethality or incomplete phenotypic fidelity. Subsequent generations of conditional, inducible, and lineage-specific models enabled dissection of visceral and neuronopathic manifestations and clarified the contributions of macrophages, B cells, neurons, microglia, osteoblasts, and endothelial cells to disease pathogenesis. More recent humanized immune and gene-edited platforms, together with multi-omics integration, now allow modeling of genotype-specific biology and therapeutic response with greater translational precision. In this review, we synthesize the evolution of GD mouse models across these eras, evaluate their strengths and limitations, and highlight species-specific challenges including differences in lipid metabolism, immune architecture, and the absence of the GBAP1 pseudogene in mice that influence interpretation and clinical translation. We outline emerging strategies for incorporating patient-derived mutations, modifier pathways, and clinically meaningful endpoints into future models. Our aim is to provide a coherent framework that bridges murine and human GD biology and supports the development of more predictive platforms to accelerate mechanistic discovery, biomarker development, and therapeutic innovation across all subtypes of GD.