ArticlebioRxiv : the preprint server for biology2025
Spatial transcriptomic profiling of decalcified murine musculoskeletal samples via Xenium Prime 5K.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Successful generation of high-quality spatial transcriptomics data from murine musculoskeletal tissues has been impeded by the challenge of preserving RNA integrity through the harsh tissue processing steps required for histological sectioning. In particular, the need to thoroughly fix and decalcify mineralized tissues has proven problematic. We detail a comprehensive sample processing pipeline for three common murine musculoskeletal tissue samples, enabling high-quality transcript detection via imaging-based spatial transcriptomics using the Xenium Prime 5K platform from 10x Genomics. Our protocol outlines methodological details for transcardiac perfusion, fixation, decalcification, paraffin processing, and a sample co-embedding strategy facilitating anatomically consistent and simultaneous sectioning of multiple samples onto the spatial transcriptomics slide. Rigorous quality control demonstrates high-quality tissue-specific outcomes across intact knee joints, tibiae, and lumbar spines from adult mice. Our pipeline enabled 70-91% high-quality transcripts across synovium, meniscus, patellar tendon, articular cartilage, subchondral bone, cortical bone, bone marrow, muscle, fracture callus, and dorsal root ganglion tissues. The average number of detected transcripts varied markedly between tissue types - soft tissues such as synovium, patellar tendon, muscle, bone marrow, and callus exhibited ~200 - 400 transcript per cell; mineralized tissues such as subchondral bone, meniscus, and cortical bone exhibited ~ 13 - 150 transcripts per cell; highly active neuronal tissues such as dorsal root ganglion neurons yielded 750 - 1100 transcripts per cell. Canonical cell markers within each tissue confirmed successful identification and representation of key cell types. Through rigorous sample quality assessment at multiple stages of processing, this protocol yields high-quality RNA transcript detection while preserving critical anatomical context and will serve as a valuable tool enabling spatial transcriptomic profiling of intact musculoskeletal tissue samples. Lay summary: Spatial transcriptomics is a powerful scientific tool that characterizes genetic coding material ("transcripts") of specific cell types in their native anatomical context. However, successfully applying this tool to musculoskeletal tissues has been challenging because preserving transcript integrity in these tissues requires additional care. The authors of this publication developed a specialized method for preparing tissue samples from mice that works with the spatial transcriptomics platform, 10x Genomics Xenium Prime 5K. This protocol improves sample quality while preserving high-quality genetic information in various mouse musculoskeletal tissues, making it easier to explore their functions. Graphical abstract:
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