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Childhood Cancer Data Initiative (CCDI): Single-cell atlas of NF1 nerve sheath tumors

ABSTRACT: Childhood Cancer Data Initiative (CCDI): Single-cell atlas of NF1 nerve sheath tumors

PROVIDER: PRJNA1062531 | ENA |

REPOSITORIES: ENA

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Childhood Cancer Data Initiative (CCDI): Single-cell atlas of NF1 nerve sheath tumors

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RNAseq of malignant peripheral nerve sheath tumors from Nf1 flox/flox Arf flox/flox PostnCre+ mice

Project description:Malignant peripheral nerve sheath tumors (MPNSTs) are the leading cause of premature death for patients with Neurofibromatosis type 1 and no approved targeted therapies are available. Transformation from Nf1-null benign plexiform neurofibromas is driven by the loss of the Cdkn2a (Arf) locus. Here, genetically engineered mouse models with combined Nf1 flox/flox and Arf flox/flox alleles were used (crossed with Postn-Cre+ mice). Tissue from MPNSTs that form in the Nf1-/-;Arf-/- setting were used for mRNA sequencing and compared to benign plexiform neurofibroma tissue (Nf1-/- from Nf1 flox/flox; Postn-Cre+ mice, GSE213789) to identify transcriptome signatures from MPNST and compare them to benign plexiform neurofibroma.

2023-12-12 | GSE232707 | GEO

Spatial gene expression profiling unveils immuno-oncogenic programs of NF1-associated peripheral nerve sheath tumor progression

Project description:Plexiform neurofibromas (PNF) are benign peripheral nerve sheath tumors (PNST) that arise in persons with neurofibromatosis type 1 (NF1). Despite similar histological appearance, these neoplasms proceed along diverse evolutionary trajectories, with a subset progressing to a devastating form of sarcoma called malignant peripheral nerve sheath tumor (MPNST), the leading cause of premature death in individuals with NF1. Malignant transformation of PNF often occurs through the development of atypical neurofibroma (ANF) precursor lesions characterized by distinct histopathological features and CDKN2A copy number loss. While genomic studies have improved our understanding of key driver events promoting tumor progression, the transcriptional alterations that precede malignant transformation remain poorly understood. Here we resolve gene expression profiles in PNSTs across the neurofibroma-to-MPNST continuum in NF1 patients and genetically engineered mouse models, providing insight into nascent molecular features associated with neurofibroma evolution and transformation. These findings highlight the need for molecular diagnostic tools that augment conventional histopathological criteria to identify neurofibromas at high risk of undergoing malignant transformation, facilitating risk-adapted care.

2023-12-14 | GSE239561 | GEO

Dual inhibition of SHP2 and autophagy suppresses NF1-associated malignant peripheral nerve sheath tumors

Project description:Malignant peripheral nerve sheath tumors (MPNSTs) are the leading cause of premature death for patients with Neurofibromatosis type 1 and no approved targeted therapies are available. Benign plexiform neurofibromas have been successfully treated with selumetinib, a MEK inhibitor, but after progression to MPNST, MEK inhibition alone is not effective. Frequently, adaptive responses to single agent targeted inhibitors invokes alterations in receptor tyrosine kinase expression and feedback regulation that leads to inhibitor bypass. Here, the effects of SHP099, an inhibitor of the protein-tyrosine phosphatase SHP2 (encoded by the PTPN11 gene) was tested alone and in combination with trametinib (MEKi) in an orthotopic implantation murine model of NF1 MPNST with defined gentotype (NI, Nf1-/-;Ink4a/Arf-/-). Kinase enrichment proteomic analysis was performed using tumor tissue from vehicle, SHP099, or trametinib and SHP099 in combination for 5, 15, or 28 days to evaluate the effects on the functional kinome.

2024-11-20 | PXD035998 | Pride

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