Cerebrospinal fluid cell-free DNA methylomes recapture pediatric medulloblastoma tissue's tumor feature
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE178666 | GEO | 2024/06/10
REPOSITORIES: GEO
Similar Datasets
Project description:Medulloblastoma (MB) is an embryonal tumor of the cerebellum and a highly malignant childhood brain tumor. Cell-free circulating tumor DNA (ctDNA) from the cerebrospinal fluid (CSF) of patients with brain tumors faithfully represent genomic alterations of brain tumors. Distinct epigenetic signatures among subgroups of MB allow us to detect epigenetic alterations in CSF to aid classify and guide therapy of MB tumors. Here, we evaluate DNA methylation and hydroxymethylation of ctDNA derived from small amount of CSF (200 µL) and matched tumor DNA from 3 MB patients. We find highly concordance of DNA methylation and hydroxymethylation between CSF ctDNA and tumor DNA, especially in CpG islands. Importantly, CSF ctDNA can mostly recapitulate the dynamic changes of DNA methylation and hydroxymehtylation in tumor species compared to healthy cerebellums. Those MB tumor signature CpGs’ DNA methylation status are recovered in CSF ctDNA can clearly distinguish MB subgroups by utilizing public large cohort data. We further identified potential diagnostic and prognostic DNA methylation markers in CSF ctDNA. Our results show that CSF ctNDA methylation and hydroxymethylation can be a minimal invasive method to assess epigenetic alterations of MB, which is complementary to current diagnoses of MB tumors.
2020-10-28 | GSE142241 | GEO
Project description:Medulloblastoma (MB) is an embryonal tumor of the cerebellum and a highly malignant childhood brain tumor. Cell-free circulating tumor DNA (ctDNA) from the cerebrospinal fluid (CSF) of patients with brain tumors faithfully represent genomic alterations of brain tumors. Distinct epigenetic signatures among subgroups of MB allow us to detect epigenetic alterations in CSF to aid classify and guide therapy of MB tumors. Here, we evaluate DNA methylation of ctDNA derived from small amount of CSF (200 µL) and matched tumor DNA from four subtypes of MB patients. We find highly concordance of DNA methylation between CSF ctDNA and tumor DNA in a subtype manner. Our results show that CSF ctNDA methylation can be a minimal invasive precisely method to assess epigenetic alterations of MB in a subtype manner, which is complementary to current diagnoses of MB tumors.
2023-06-01 | GSE178169 | GEO
Project description:Medulloblastomas (MBs) are malignant pediatric brain tumors that are molecularly and clinically very heterogenous. To unravel phenotypically relevant MB subtypes, we compiled a harmonized proteome dataset of 167 MBs and integrated findings with DNA methylation and N-glycome data. Six proteome MB subtypes emerged, that could be assigned to two main molecular programs: transcription/translation (pSHHt, pWNT and pGroup3-Myc), and synapses/immunological processes (pSHHs, pGroup3 and pGroup4). Multiomic analysis revealed different conservation levels of proteome features across MB subtypes at the DNA-methylation level. Aggressive pGroup3-Myc MBs and favorable pWNT MBs were most similar in cluster hierarchies concerning overall proteome patterns but showed different protein abundances of the vincristine resistance associated multiprotein complex TriC/CCT and of N-glycan turnover associated factors. The N-glycome reflected proteome subtypes and complex-bisecting N-glycans characterized pGroup3-Myc tumors. Our results shed light on new targetable alterations in MB and set a foundation for potential immunotherapies targeting glycan structures.
2024-06-05 | PXD039319 | Pride
Project description:Astrocytoma, oligodendroglioma, oligoastrocytoma, and ependymoma are the main histologic subtypes of glioma. The molecular character of these subtypes has profound implications for understanding their causes and treatment. We describe the epigenetic landscape of these tumor types using novel DNA methylation profiling tools. There is a robust association of methylation profile with tumor histology and IDH1 mutation status. Furthermore, tumors with IDH1 mutation independently predict a tumor hypermethylator phenotype, histology, TP53 mutation status, patient age, and survival. Integrating tumor epigenetic and genetic alterations, this work provides a critical step toward better defining the somatic nature of glioma which will have great potential to impact clinical approaches to disease. This work provides an important step forward in classification of malignant brain tumors using DNA methylation profiling, integrating knowledge regarding IDH1 mutation in gliomas. The epigenetic homogeneity of the IDH1 mutant subclass despite histologic diversity implies that IDH1 mutation is a “driver” or functional determinant of a distinct DNA methylation phenotype, suggesting a novel role for an altered metabolic profile in the brain. This association occurs across histologic subtypes and demonstrates a clear relationship between genetic alteration and epigenetic profile. Fresh frozen tumor tissues were obtained from the University of California San Francisco (UCSF) Brain Tumor Research Center tissue bank with appropriate institutional review board approval. Tumors were diagnosed between 1990 and 2003. Tumor samples were defined as secondary GBM if the patients had prior histological diagnosis of a low-grade glioma. Tumors had previously been reviewed by UCSF neuropathologists to assign histologic subtype and grade. Normal brain tissue samples were from cancer-free patients who underwent temporal lobe resection as treatment for epilepsy at UCSF.
2010-12-20 | E-GEOD-20395 | biostudies-arrayexpress
Project description:Medulloblastomas (MBs) are malignant pediatric brain tumors that are molecularly and clinically very heterogenous. To unravel phenotypically relevant MB subtypes, we compiled a harmonized proteome dataset of 167 MBs and integrated findings with DNA methylation and N-glycome data. Six proteome MB subtypes emerged, that could be assigned to two main molecular programs: transcription/translation (pSHHt, pWNT and pGroup3-Myc), and synapses/immunological processes (pSHHs, pGroup3 and pGroup4). Multiomic analysis revealed different conservation levels of proteome features across MB subtypes at the DNA-methylation level. Aggressive pGroup3-Myc MBs and favorable pWNT MBs were most similar in cluster hierarchies concerning overall proteome patterns but showed different protein abundances of the vincristine resistance associated multiprotein complex TriC/CCT and of N-glycan turnover associated factors. The N-glycome reflected proteome subtypes and complex-bisecting N-glycans characterized pGroup3-Myc tumors. Our results shed light on new targetable alterations in MB and set a foundation for potential immunotherapies targeting glycan structures. This dataset includes samples which were used for technical and biological validation of previously acquired results.
2024-06-03 | PXD048767 | Pride
Project description:Neuroblastoma pathogenesis has been reported to be closely associated with numerous genetic alterations. However, underlying DNA methylation patterns have not been extensively studied in this developmental malignancy. In this study, we generated microarray-based DNA methylation profiles of primary neuroblastic tumors. Stringent supervised differential methylation analyses allowed us to identify epigenetic changes characteristic for NB tumors as well as for clinical and biological subtypes of NB. We observed that gene-specific loss of DNA methylation is more prevalent than promoter hypermethylation. Overall, the differentially methylated genes showed that functional pathways affected by hypermethylation are different from those affected by hypomethylation. This study provides a comprehensive view of the global DNA methylation profile of NB tumors. Bisulphite converted DNA from the 25 neuroblastic tumor and 2 non patological tissues (fetal brain and adrenal gland) samples were hybridised to the Illumina Infinium 27k Human Methylation
2012-10-29 | E-GEOD-39626 | biostudies-arrayexpress
Project description:Astrocytoma, oligodendroglioma, oligoastrocytoma, and ependymoma are the main histologic subtypes of glioma. The molecular character of these subtypes has profound implications for understanding their causes and treatment. We describe the epigenetic landscape of these tumor types using novel DNA methylation profiling tools. There is a robust association of methylation profile with tumor histology and IDH1 mutation status. Furthermore, tumors with IDH1 mutation independently predict a tumor hypermethylator phenotype, histology, TP53 mutation status, patient age, and survival. Integrating tumor epigenetic and genetic alterations, this work provides a critical step toward better defining the somatic nature of glioma which will have great potential to impact clinical approaches to disease. This work provides an important step forward in classification of malignant brain tumors using DNA methylation profiling, integrating knowledge regarding IDH1 mutation in gliomas. The epigenetic homogeneity of the IDH1 mutant subclass despite histologic diversity implies that IDH1 mutation is a “driver” or functional determinant of a distinct DNA methylation phenotype, suggesting a novel role for an altered metabolic profile in the brain. This association occurs across histologic subtypes and demonstrates a clear relationship between genetic alteration and epigenetic profile.
2010-12-20 | GSE20395 | GEO
Project description:Embryonal tumors with multilayered rosettes (ETMR) are rare malignant embryonal brain tumors. The prognosis of ETMR is poor and novel therapeutic approaches are desperately needed. Comprehension of ETMR tumor biology is based on only few previous molecular studies, which mainly relied on the analyses of nucleic acids. In this study, we explored integrated ETMR proteomics with the aim to identify novel therapeutic vulnerabilities in these deadly tumors. Using mass spectrometry, proteome data were acquired from FFPE tissue of 40 embryonal brain tumors (16 ETMR, 9 atypical teratoid/rhabdoid tumors (AT/RT), 15 medulloblastomas (MB)) and integrated with case-matched global DNA methylation data, publicly available transcriptome data, and proteome data of further pediatric brain tumors. Proteome-based cluster analyses grouped ETMR samples according to histomorphology, separating neuropil-rich tumors with neuronal signatures from primitive tumors with signatures relating to stemness and chromosome organization. Microdissection analyses highlighted the close relationship of ETMR histomorphology and proteome profiles, regardless of intra- or intertumoral comparisons. Integrated proteomics showcased that ETMR harbor proteasome regulatory proteins in abundancy, implicating their strong dependency on the proteasome machinery to safeguard proteostasis. Respectively, in vitro cell culture viability assays using embryonal brain tumor cell lines BT183 (ETMR), BT16 (AT/RT), and D283 (MB) highlighted that ETMR cells were highly vulnerable towards treatment with the CNS penetrant proteasome inhibitor Marizomib. In summary, histomorphology stipulates the proteome signatures of ETMR. Pervasive and histomorphology-independent abundancy of proteasome regulatory proteins in ETMR indicates a strong proteasome dependency throughout these tumors. As validated in cell culture experiments, proteasome inhibition poses a promising therapeutic option in ETMR.
2024-01-08 | PXD045268 | Pride
Project description:<p>Medulloblastomas (MBs) are malignant pediatric brain tumors that are molecularly and clinically very heterogenous. The application of omics technologies - mainly studying nucleic acids - has significantly improved MB classification and stratification, but treatment options are still unsatisfactory. The proteome and their N-glycans reflect the phenotype of a tumor in a more direct way and thus hold the potential to discover clinically relevant phenotypes and targetable pathways. We compiled a harmonized proteome dataset of 167 MBs and integrated findings with DNA methylome and N-glycome data. Six proteome MB subtypes emerged, that could be assigned to two main molecular programs: transcription/translation (pSHHt, pWNT and pGroup3myc), and synapses/immunological processes (pSHHs, pGroup3 and pGroup4). Multiomic analysis revealed different conservation levels of proteome features across MB subtypes at the DNA methylome level. Aggressive pGroup3myc MBs and favourable pWNT MBs were most similar in cluster hierarchies concerning overall proteome patterns but showed different protein abundances of the vincristine resistance-associated multiprotein complex TriC/CCT and of N-glycan turnover-associated factors. The N-glycome reflected proteome subtypes and complex-bisecting N-glycans characterized pGroup3myc tumors. Our results shed light on new targetable alterations in MB and set a foundation for potential immunotherapies targeting glycan structures.</p><p><br></p><p><strong>Metabolite profiling</strong> is reported in the current study <a href='https://www.ebi.ac.uk/metabolights/MTBLS9830' rel='noopener noreferrer' target='_blank'><strong>MTBLS9830</strong></a>.</p><p><strong>Amino acid profiling</strong> is reported in <a href='https://www.ebi.ac.uk/metabolights/MTBLS9836' rel='noopener noreferrer' target='_blank'><strong>MTBLS9836</strong></a>.</p>
2024-05-30 | MTBLS9830 | MetaboLights
Project description:<p>Medulloblastomas (MBs) are malignant pediatric brain tumors that are molecularly and clinically very heterogenous. The application of omics technologies - mainly studying nucleic acids - has significantly improved MB classification and stratification, but treatment options are still unsatisfactory. The proteome and their N-glycans reflect the phenotype of a tumor in a more direct way and thus hold the potential to discover clinically relevant phenotypes and targetable pathways. We compiled a harmonized proteome dataset of 167 MBs and integrated findings with DNA methylome and N-glycome data. Six proteome MB subtypes emerged, that could be assigned to two main molecular programs: transcription/translation (pSHHt, pWNT and pGroup3myc), and synapses/immunological processes (pSHHs, pGroup3 and pGroup4). Multiomic analysis revealed different conservation levels of proteome features across MB subtypes at the DNA methylome level. Aggressive pGroup3myc MBs and favourable pWNT MBs were most similar in cluster hierarchies concerning overall proteome patterns but showed different protein abundances of the vincristine resistance-associated multiprotein complex TriC/CCT and of N-glycan turnover-associated factors. The N-glycome reflected proteome subtypes and complex-bisecting N-glycans characterized pGroup3myc tumors. Our results shed light on new targetable alterations in MB and set a foundation for potential immunotherapies targeting glycan structures.</p><p><br></p><p><strong>Amino acid profiling</strong> is reported in the current study <a href='https://www.ebi.ac.uk/metabolights/MTBLS9836' rel='noopener noreferrer' target='_blank'><strong>MTBLS9836</strong></a>.</p><p><strong>Metabolite profiling</strong> is reported in <a href='https://www.ebi.ac.uk/metabolights/MTBLS9830' rel='noopener noreferrer' target='_blank'><strong>MTBLS9830</strong></a>.</p>
2024-05-30 | MTBLS9836 | MetaboLights