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      Neural network learning defines glioblastoma features to be of neural crest perivascular or radial glia lineages

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          Abstract

          Glioblastoma is believed to originate from nervous system cells; however, a putative origin from vessel-associated progenitor cells has not been considered. We deeply single-cell RNA–sequenced glioblastoma progenitor cells of 18 patients and integrated 710 bulk tumors and 73,495 glioma single cells of 100 patients to determine the relation of glioblastoma cells to normal brain cell types. A novel neural network–based projection of the developmental trajectory of normal brain cells uncovered two principal cell-lineage features of glioblastoma, neural crest perivascular and radial glia, carrying defining methylation patterns and survival differences. Consistently, introducing tumorigenic alterations in naïve human brain perivascular cells resulted in brain tumors. Thus, our results suggest that glioblastoma can arise from the brains’ vasculature, and patients with such glioblastoma have a significantly poorer outcome.

          Abstract

          Abstract

          Neural network defines GBM features to be of neural crest perivascular or radial glia lineage.

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          Most cited references60

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          Comprehensive Integration of Single-Cell Data

          Single-cell transcriptomics has transformed our ability to characterize cell states, but deep biological understanding requires more than a taxonomic listing of clusters. As new methods arise to measure distinct cellular modalities, a key analytical challenge is to integrate these datasets to better understand cellular identity and function. Here, we develop a strategy to "anchor" diverse datasets together, enabling us to integrate single-cell measurements not only across scRNA-seq technologies, but also across different modalities. After demonstrating improvement over existing methods for integrating scRNA-seq data, we anchor scRNA-seq experiments with scATAC-seq to explore chromatin differences in closely related interneuron subsets and project protein expression measurements onto a bone marrow atlas to characterize lymphocyte populations. Lastly, we harmonize in situ gene expression and scRNA-seq datasets, allowing transcriptome-wide imputation of spatial gene expression patterns. Our work presents a strategy for the assembly of harmonized references and transfer of information across datasets.
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            RNA velocity of single cells

            RNA abundance is a powerful indicator of the state of individual cells. Single-cell RNA sequencing can reveal RNA abundance with high quantitative accuracy, sensitivity and throughput1. However, this approach captures only a static snapshot at a point in time, posing a challenge for the analysis of time-resolved phenomena, such as embryogenesis or tissue regeneration. Here we show that RNA velocity—the time derivative of the gene expression state—can be directly estimated by distinguishing unspliced and spliced mRNAs in common single-cell RNA sequencing protocols. RNA velocity is a high-dimensional vector that predicts the future state of individual cells on a timescale of hours. We validate its accuracy in the neural crest lineage, demonstrate its use on multiple published datasets and technical platforms, reveal the branching lineage tree of the developing mouse hippocampus, and examine the kinetics of transcription in human embryonic brain. We expect RNA velocity to greatly aid the analysis of developmental lineages and cellular dynamics, particularly in humans.
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              The basics of epithelial-mesenchymal transition.

              The origins of the mesenchymal cells participating in tissue repair and pathological processes, notably tissue fibrosis, tumor invasiveness, and metastasis, are poorly understood. However, emerging evidence suggests that epithelial-mesenchymal transitions (EMTs) represent one important source of these cells. As we discuss here, processes similar to the EMTs associated with embryo implantation, embryogenesis, and organ development are appropriated and subverted by chronically inflamed tissues and neoplasias. The identification of the signaling pathways that lead to activation of EMT programs during these disease processes is providing new insights into the plasticity of cellular phenotypes and possible therapeutic interventions.

                Author and article information

                Contributors
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: ResourcesRole: SoftwareRole: ValidationRole: VisualizationRole: Writing - original draftRole: Writing - review & editing
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: InvestigationRole: MethodologyRole: ResourcesRole: ValidationRole: VisualizationRole: Writing - original draftRole: Writing - review & editing
                Role: ConceptualizationRole: InvestigationRole: MethodologyRole: ValidationRole: Writing - original draftRole: Writing - review & editing
                Role: Formal analysisRole: SoftwareRole: ValidationRole: Writing - original draft
                Role: Investigation
                Role: Investigation
                Role: Investigation
                Role: InvestigationRole: Methodology
                Role: InvestigationRole: Validation
                Role: Formal analysisRole: Software
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: SoftwareRole: Visualization
                Role: ConceptualizationRole: ResourcesRole: Writing - original draftRole: Writing - review & editing
                Role: ConceptualizationRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SupervisionRole: Validation
                Role: ConceptualizationRole: MethodologyRole: ResourcesRole: Supervision
                Role: ConceptualizationRole: Funding acquisitionRole: MethodologyRole: Project administrationRole: ResourcesRole: SupervisionRole: ValidationRole: VisualizationRole: Writing - original draftRole: Writing - review & editing
                Journal
                Sci Adv
                Sci Adv
                sciadv
                advances
                Science Advances
                American Association for the Advancement of Science
                2375-2548
                June 2022
                08 June 2022
                : 8
                : 23
                : eabm6340
                Affiliations
                [1 ]Division of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.
                [2 ]Computational Biology Group, Luxembourg Centre for Systems Biomedicine (LCSB), University of Luxembourg, 4362 Esch-sur-Alzette, Luxembourg.
                [3 ]CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain.
                [4 ]IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain.
                [5 ]Department of Molecular Neurosciences, Center for Brain Research, Medical University Vienna, Vienna, Austria.
                [6 ]Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
                [7 ]Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
                [8 ]Department of Neurosurgery, Karolinska University Hospital, Stockholm, Sweden.
                Author notes
                [* ]Corresponding author. Email: patrik.ernfors@ 123456ki.se
                [†]

                These authors contributed equally to this work.

                Author information
                https://orcid.org/0000-0002-2635-0258
                https://orcid.org/0000-0003-4517-2650
                https://orcid.org/0000-0001-5780-0971
                https://orcid.org/0000-0003-4808-6643
                https://orcid.org/0000-0002-3603-8073
                https://orcid.org/0000-0002-6348-1994
                https://orcid.org/0000-0001-7031-998X
                https://orcid.org/0000-0003-4949-0533
                https://orcid.org/0000-0001-7777-3210
                https://orcid.org/0000-0002-9926-617X
                https://orcid.org/0000-0001-5471-0356
                https://orcid.org/0000-0003-1179-7003
                https://orcid.org/0000-0001-5906-7443
                https://orcid.org/0000-0002-1140-3986
                Article
                abm6340
                10.1126/sciadv.abm6340
                9177076
                35675414
                1a37d16f-38dd-421a-b3c5-88559f0f3513
                Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

                This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

                History
                : 30 September 2021
                : 20 April 2022
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100003748, Svenska Sällskapet för Medicinsk Forskning;
                Award ID: 18 0635
                Funded by: FundRef http://dx.doi.org/10.13039/501100003748, Svenska Sällskapet för Medicinsk Forskning;
                Funded by: Swedish Cancer Society;
                Award ID: 18 0635
                Funded by: Swedish Society for Medical Research (SSMF);
                Funded by: Swedish Medical Research Council;
                Funded by: Knut and Alice Wallenbergs Foundation;
                Categories
                Research Article
                Biomedicine and Life Sciences
                SciAdv r-articles
                Cell Biology
                Computer Science
                Cell Biology
                Custom metadata
                Mjoy Azul

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