Researchers Develop Standardized MNase-seq Framework for Reproducible Nucleosome Profiling
Scientists created a scalable, standardized workflow for micrococcal nuclease (MNase) sequencing that improves reproducibility of chromatin accessibility studies across different cell types. The framework addresses long-standing limitations including sensitivity to reaction conditions and high cell input requirements by optimizing buffer composition, DNA purification, fixation parameters, and incorporating yeast spike-in normalization. This advance enables more consistent nucleosome profiling across pluripotent stem cells, cardiomyocytes, and other models, potentially accelerating chromatin research.
Researchers developed a comprehensive MNase-seq workflow designed to overcome technical barriers that have limited the widespread application of nucleosome profiling across different cell types. The standardized framework addresses key challenges including sensitivity to reaction conditions, high cell input requirements, and lack of protocol consistency by optimizing multiple parameters: buffer composition, DNA purification chemistry, fixation and decrosslinking procedures, and cell input scalability. The team validated their approach across human induced pluripotent stem cells (hiPSCs), hiPSC-derived cardiomyocytes at various differentiation stages, primary murine embryonic cardiac cells, and adult mouse cardiomyocytes, demonstrating comparable digestion efficiencies despite significant differences in cellular architecture and chromatin organization. Using a yeast spike-in for quantitative normalization and the nucMACC bioinformatic pipeline, they achieved precise nucleosome positioning at regulatory elements controlling pluripotency. This modular, end-to-end platform provides researchers with a standardized tool for reproducible chromatin profiling across diverse experimental models.
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- bioRxivCenter
A scalable MNase-seq framework for reproducible nucleosome profiling across pluripotent stem cell and cardiomyocyte models
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