Single-Cell Comparison of Schwann and Fibroblast Cells Reveals Distinct Transcriptional Programs in NF1-Associated Neurofibromas
Swanson, G.; Arenas-Hernandez, M.; Gurdziel, K.
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Neurofibromatosis type 1 (NF1) is an inherited tumor predisposition syndrome characterized by the development of benign peripheral nerve sheath tumors, most commonly cutaneous neurofibromas (cNFs) and plexiform neurofibromas (pNFs). Although both tumor types arise from Schwann cells and share NF1 loss as a genetic driver, they differ markedly in growth behavior, microenvironmental context, and clinical outcomes, with pNFs carrying risk of malignant transformation. To define transcriptional programs that underlie these differences, we performed an integrative single-cell RNA sequencing analysis of Schwann cells and fibroblasts from cNF and pNF tumors, alongside NF1-expressing reference populations derived from human skin and nerve. This approach enabled us to disentangle NF1-dependent transcriptional changes from tissue-of-origin effects. We identified distinct Schwann cell states that separated tumor from non-tumor populations and further distinguished cNFs from pNFs, highlighting both shared disease-associated features and subtype-specific adaptations. These findings establish a framework for understanding how NF1 loss interacts with developmental origin and tissue context to shape divergent tumor phenotypes and may inform strategies for therapeutic targeting in NF1-associated neurofibromas.
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