1
|
Basier C, Nurse P. TOR regulates variability of protein synthesis rates. EMBO J 2024; 43:1618-1633. [PMID: 38499788 PMCID: PMC11021518 DOI: 10.1038/s44318-024-00075-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 02/20/2024] [Accepted: 02/23/2024] [Indexed: 03/20/2024] Open
Abstract
Cellular processes are subject to inherent variability, but the extent to which cells can regulate this variability has received little investigation. Here, we explore the characteristics of the rate of cellular protein synthesis in single cells of the eukaryote fission yeast. Strikingly, this rate is highly variable despite protein synthesis being dependent on hundreds of reactions which might be expected to average out at the overall cellular level. The rate is variable over short time scales, and exhibits homoeostatic behaviour at the population level. Cells can regulate the level of variability through processes involving the TOR pathway, suggesting there is an optimal level of variability conferring a selective advantage. While this could be an example of bet-hedging, but we propose an alternative explanation: regulated 'loose' control of complex processes of overall cellular metabolism such as protein synthesis, may lead to this variability. This could ensure cells are fluid in control and agile in response to changing conditions, and may constitute a novel organisational principle of complex metabolic cellular systems.
Collapse
Affiliation(s)
- Clovis Basier
- Cell Cycle Laboratory, The Francis Crick Institute, London, NW1 1AT, UK.
| | - Paul Nurse
- Cell Cycle Laboratory, The Francis Crick Institute, London, NW1 1AT, UK
- Laboratory of Yeast Genetics and Cell Biology, Rockefeller University, New York, NY, 10065, USA
| |
Collapse
|
2
|
Helms HR, Oyama KA, Ware JP, Ibsen SD, Bertassoni LE. Multiplex Single-Cell Bioprinting for Engineering of Heterogeneous Tissue Constructs with Subcellular Spatial Resolution. bioRxiv 2024:2024.02.01.578499. [PMID: 38352428 PMCID: PMC10862823 DOI: 10.1101/2024.02.01.578499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
Tissue development, function, and disease are largely driven by the spatial organization of individual cells and their cell-cell interactions. Precision engineered tissues with single-cell spatial resolution, therefore, have tremendous potential for next generation disease models, drug discovery, and regenerative therapeutics. Despite significant advancements in biofabrication approaches to improve feature resolution, strategies to fabricate tissues with the exact same organization of individual cells in their native cellular microenvironment have remained virtually non-existent to date. Here we report a method to spatially pattern single cells with up to eight cell phenotypes and subcellular spatial precision. As proof-of-concept we first demonstrate the ability to systematically assess the influence of cellular microenvironments on cell behavior by controllably altering the spatial arrangement of cell types in bioprinted precision cell-cell interaction arrays. We then demonstrate, for the first time, the ability to produce high-fidelity replicas of a patient's annotated cancer biopsy with subcellular resolution. The ability to replicate native cellular microenvironments marks a significant advancement for precision biofabricated in-vitro models, where heterogenous tissues can be engineered with single-cell spatial precision to advance our understanding of complex biological systems in a controlled and systematic manner.
Collapse
Affiliation(s)
- Haylie R Helms
- Knight Cancer Precision Biofabrication Hub, Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97201, USA
- Department of Biomedical Engineering, School of Medicine, Oregon Health and Science University, Portland, OR 97201, USA
- Cancer Early Detection Advanced Research Center (CEDAR), Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97201, USA
| | - Kody A Oyama
- Knight Cancer Precision Biofabrication Hub, Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97201, USA
| | - Jason P Ware
- Department of Biomedical Engineering, School of Medicine, Oregon Health and Science University, Portland, OR 97201, USA
- Cancer Early Detection Advanced Research Center (CEDAR), Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97201, USA
| | - Stuart D Ibsen
- Department of Biomedical Engineering, School of Medicine, Oregon Health and Science University, Portland, OR 97201, USA
- Cancer Early Detection Advanced Research Center (CEDAR), Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97201, USA
| | - Luiz E Bertassoni
- Knight Cancer Precision Biofabrication Hub, Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97201, USA
- Department of Biomedical Engineering, School of Medicine, Oregon Health and Science University, Portland, OR 97201, USA
- Cancer Early Detection Advanced Research Center (CEDAR), Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97201, USA
- Division of Oncological Sciences, Knight Cancer Institute, Oregon Health and Science University, Portland, OR 97201, USA
- Division of Biomaterials and Biomechanics, Department of Oral Rehabilitation and Biosciences, School of Dentistry, Oregon Health and Science University, Portland, OR 97201, USA
- Center for Regenerative Medicine, School of Medicine, Oregon Health and Science University, Portland, OR 97201, USA
| |
Collapse
|
3
|
Ve K, R R, Cac P, A K, E T, Cc S, Ab O. Single Nucleotide Polymorphism (SNP) and Antibody-based Cell Sorting (SNACS): A tool for demultiplexing single-cell DNA sequencing data. bioRxiv 2024:2024.02.07.579345. [PMID: 38370638 PMCID: PMC10871358 DOI: 10.1101/2024.02.07.579345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Abstract
Motivation Recently, single-cell DNA sequencing (scDNA-seq) and multi-modal profiling with the addition of cell-surface antibodies (scDAb-seq) have provided key insights into cancer heterogeneity. Scaling these technologies across large patient cohorts, however, is cost and time prohibitive. Multiplexing, in which cells from unique patients are pooled into a single experiment, offers a possible solution. While multiplexing methods exist for scRNAseq, accurate demultiplexing in scDNAseq remains an unmet need. Results Here, we introduce SNACS: Single-Nucleotide Polymorphism (SNP) and Antibody-based Cell Sorting. SNACS relies on a combination of patient-level cell-surface identifiers and natural variation in genetic polymorphisms to demultiplex scDNAseq data. We demonstrated the performance of SNACS on a dataset consisting of multi-sample experiments from patients with leukemia where we knew truth from single-sample experiments from the same patients. Using SNACS, accuracy ranged from 0.948 - 0.991 vs 0.552 - 0.934 using demultiplexing methods from the single-cell literature.
Collapse
Affiliation(s)
- Kennedy Ve
- Division of Hematology and Oncology, Department of Medicine, University of California San Francisco, San Francisco, CA, USA, 94143
| | - Roy R
- Hellen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA, USA, 94143
| | - Peretz Cac
- Hellen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA, USA, 94143
- Division of Hematology and Oncology, Department of Pediatrics, University of California San Francisco, San Francisco, CA, USA, 94143
| | - Koh A
- Division of Hematology and Oncology, Department of Medicine, University of California San Francisco, San Francisco, CA, USA, 94143
| | - Tran E
- Division of Hematology and Oncology, Department of Medicine, University of California San Francisco, San Francisco, CA, USA, 94143
| | - Smith Cc
- Division of Hematology and Oncology, Department of Medicine, University of California San Francisco, San Francisco, CA, USA, 94143
- Hellen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA, USA, 94143
| | - Olshen Ab
- Hellen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA, USA, 94143
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USA, 94143
| |
Collapse
|
4
|
Barut I, He X, Sener E, Sämfors S, Ewing AG, Fletcher JS. Correlative Cellular Mass Spectrometry Imaging and Amperometry Show Dose Dependent Changes in Lipid Composition and Exocytosis. Angew Chem Int Ed Engl 2023; 62:e202217993. [PMID: 36749546 DOI: 10.1002/anie.202217993] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/27/2023] [Accepted: 02/07/2023] [Indexed: 02/08/2023]
Abstract
Aberrant functioning of the proteasome has been associated with crucial pathologic conditions including neurodegeneration. Yet, the complex underlying causes at the cellular level remain unclear and there are conflicting reports of neuroprotective to neurodegenerative effects of proteasomal inhibitors such as lactacystin that are utilised as models for neurodegenerative diseases. The conflicting results may be associated with different dose regimes of lactacystin and hence we have performed a dose dependent study of the effects of lactacystin to identify concurrent changes in the cell membrane lipid profile and the dynamics of exocytosis using a combination of surface sensitive mass spectrometry and single cell amperometry. Significant changes of negatively charged lipids were associated with different lactacystin doses that showed a weak correlation with exocytosis while changes in PE and PE-O lipids showed dose dependent changes correlated with initial pore formation and total release of vesicle content respectively.
Collapse
Affiliation(s)
- Inci Barut
- Department of Chemistry and Molecular Biology, University of Gothenburg, 41296, Gothenburg, Sweden.,Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Gazi University, Ankara, Turkey
| | - Xiulan He
- Department of Chemistry and Molecular Biology, University of Gothenburg, 41296, Gothenburg, Sweden
| | - Erol Sener
- Department of Analytical Chemistry, Faculty of Pharmacy, Anadolu University, 26470, Eskisehir, Turkey
| | - Sanna Sämfors
- Department of Chemistry and Molecular Biology, University of Gothenburg, 41296, Gothenburg, Sweden
| | - Andrew G Ewing
- Department of Chemistry and Molecular Biology, University of Gothenburg, 41296, Gothenburg, Sweden
| | - John S Fletcher
- Department of Chemistry and Molecular Biology, University of Gothenburg, 41296, Gothenburg, Sweden
| |
Collapse
|
5
|
Kanke M, Kennedy Ng MM, Connelly S, Singh M, Schaner M, Shanahan MT, Wolber EA, Beasley C, Lian G, Jain A, Long MD, Barnes EL, Herfarth HH, Isaacs KL, Hansen JJ, Kapadia M, Guillem JG, Feschotte C, Furey TS, Sheikh SZ, Sethupathy P. Single-Cell Analysis Reveals Unexpected Cellular Changes and Transposon Expression Signatures in the Colonic Epithelium of Treatment-Naïve Adult Crohn's Disease Patients. Cell Mol Gastroenterol Hepatol 2022; 13:1717-1740. [PMID: 35158099 PMCID: PMC9046244 DOI: 10.1016/j.jcmgh.2022.02.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 02/04/2022] [Accepted: 02/04/2022] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS The intestinal barrier comprises a monolayer of specialized intestinal epithelial cells (IECs) that are critical in maintaining mucosal homeostasis. Dysfunction within various IEC fractions can alter intestinal permeability in a genetically susceptible host, resulting in a chronic and debilitating condition known as Crohn's disease (CD). Defining the molecular changes in each IEC type in CD will contribute to an improved understanding of the pathogenic processes and the identification of cell type-specific therapeutic targets. We performed, at single-cell resolution, a direct comparison of the colonic epithelial cellular and molecular landscape between treatment-naïve adult CD and non-inflammatory bowel disease control patients. METHODS Colonic epithelial-enriched, single-cell sequencing from treatment-naïve adult CD and non-inflammatory bowel disease patients was investigated to identify disease-induced differences in IEC types. RESULTS Our analysis showed that in CD patients there is a significant skew in the colonic epithelial cellular distribution away from canonical LGR5+ stem cells, located at the crypt bottom, and toward one specific subtype of mature colonocytes, located at the crypt top. Further analysis showed unique changes to gene expression programs in every major cell type, including a previously undescribed suppression in CD of most enteroendocrine driver genes as well as L-cell markers including GCG. We also dissect an incompletely understood SPIB+ cell cluster, revealing at least 4 subclusters that likely represent different stages of a maturational trajectory. One of these SPIB+ subclusters expresses crypt-top colonocyte markers and is up-regulated significantly in CD, whereas another subcluster strongly expresses and stains positive for lysozyme (albeit no other canonical Paneth cell marker), which surprisingly is greatly reduced in expression in CD. In addition, we also discovered transposable element markers of colonic epithelial cell types as well as transposable element families that are altered significantly in CD in a cell type-specific manner. Finally, through integration with data from genome-wide association studies, we show that genes implicated in CD risk show heretofore unknown cell type-specific patterns of aberrant expression in CD, providing unprecedented insight into the potential biological functions of these genes. CONCLUSIONS Single-cell analysis shows a number of unexpected cellular and molecular features, including transposable element expression signatures, in the colonic epithelium of treatment-naïve adult CD.
Collapse
Affiliation(s)
- Matt Kanke
- Biomedical Sciences, Cornell University, Ithaca, New York
| | - Meaghan M Kennedy Ng
- Genetics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Sean Connelly
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Manvendra Singh
- Molecular Biology and Genetics, Cornell University, Ithaca, New York
| | - Matthew Schaner
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | | | - Elizabeth A Wolber
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Caroline Beasley
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Grace Lian
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Animesh Jain
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Millie D Long
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Edward L Barnes
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Hans H Herfarth
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Kim L Isaacs
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Jonathon J Hansen
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Muneera Kapadia
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Jose Gaston Guillem
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Cedric Feschotte
- Molecular Biology and Genetics, Cornell University, Ithaca, New York
| | - Terrence S Furey
- Genetics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
| | - Shehzad Z Sheikh
- Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
| | | |
Collapse
|
6
|
Cortese N, Carriero R, Laghi L, Mantovani A, Marchesi F. Prognostic significance of tumor-associated macrophages: past, present and future. Semin Immunol 2020; 48:101408. [PMID: 32943279 DOI: 10.1016/j.smim.2020.101408] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 08/06/2020] [Accepted: 08/12/2020] [Indexed: 12/14/2022]
Abstract
Tumor tissues are populated by a multitude of macrophages, highly different in functional activity, localization and morphology. A clear contribution to disease progression has been shown in multiple cancer types, holding promise for the development of innovative macrophage-based prognostic tools. Current studies aimed at assessing the prognostic role of macrophages have documented the relevance of the macrophage population as a whole. However, dissecting the diversity of mononuclear phagocytes in tumor tissues has provided important information about the coexistence of distinct populations of macrophages with different prognostic significance. Here we summarize evidence of macrophage prognostic function in human cancer and focus on classical and modern strategies aimed at measuring macrophage features and deciphering their diversity. The wealth of new data generated will reshape our knowledge of macrophage complexity and hopefully foster the forthcoming development of these new metrics into prognostic tools as well as new therapeutic strategies.
Collapse
|
7
|
Abstract
Background A key challenge in the emerging field of single-cell RNA-Seq is to characterize phenotypic diversity between cells and visualize this information in an informative manner. A common technique when dealing with high-dimensional data is to project the data to 2 or 3 dimensions for visualization. However, there are a variety of methods to achieve this result and once projected, it can be difficult to ascribe biological significance to the observed features. Additionally, when analyzing single-cell data, the relationship between cells can be obscured by technical confounders such as variable gene capture rates. Results To aid in the analysis and interpretation of single-cell RNA-Seq data, we have developed FastProject, a software tool which analyzes a gene expression matrix and produces a dynamic output report in which two-dimensional projections of the data can be explored. Annotated gene sets (referred to as gene ‘signatures’) are incorporated so that features in the projections can be understood in relation to the biological processes they might represent. FastProject provides a novel method of scoring each cell against a gene signature so as to minimize the effect of missed transcripts as well as a method to rank signature-projection pairings so that meaningful associations can be quickly identified. Additionally, FastProject is written with a modular architecture and designed to serve as a platform for incorporating and comparing new projection methods and gene selection algorithms. Conclusions Here we present FastProject, a software package for two-dimensional visualization of single cell data, which utilizes a plethora of projection methods and provides a way to systematically investigate the biological relevance of these low dimensional representations by incorporating domain knowledge. Electronic supplementary material The online version of this article (doi:10.1186/s12859-016-1176-5) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- David DeTomaso
- Department of Electrical Engineering and Computer Science and Center for Computational Biology, University of California, Berkeley, 97420, CA, USA
| | - Nir Yosef
- Department of Electrical Engineering and Computer Science and Center for Computational Biology, University of California, Berkeley, 97420, CA, USA. .,Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology, and Harvard University, Boston, 02139, Massachusetts, USA.
| |
Collapse
|