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Yaghmaeian Salmani B, Lahti L, Gillberg L, Jacobsen JK, Mantas I, Svenningsson P, Perlmann T. Transcriptomic atlas of midbrain dopamine neurons uncovers differential vulnerability in a Parkinsonism lesion model. eLife 2024; 12:RP89482. [PMID: 38587883 PMCID: PMC11001297 DOI: 10.7554/elife.89482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024] Open
Abstract
Midbrain dopamine (mDA) neurons comprise diverse cells with unique innervation targets and functions. This is illustrated by the selective sensitivity of mDA neurons of the substantia nigra compacta (SNc) in patients with Parkinson's disease, while those in the ventral tegmental area (VTA) are relatively spared. Here, we used single nuclei RNA sequencing (snRNA-seq) of approximately 70,000 mouse midbrain cells to build a high-resolution atlas of mouse mDA neuron diversity at the molecular level. The results showed that differences between mDA neuron groups could best be understood as a continuum without sharp differences between subtypes. Thus, we assigned mDA neurons to several 'territories' and 'neighborhoods' within a shifting gene expression landscape where boundaries are gradual rather than discrete. Based on the enriched gene expression patterns of these territories and neighborhoods, we were able to localize them in the adult mouse midbrain. Moreover, because the underlying mechanisms for the variable sensitivities of diverse mDA neurons to pathological insults are not well understood, we analyzed surviving neurons after partial 6-hydroxydopamine (6-OHDA) lesions to unravel gene expression patterns that correlate with mDA neuron vulnerability and resilience. Together, this atlas provides a basis for further studies on the neurophysiological role of mDA neurons in health and disease.
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Affiliation(s)
| | - Laura Lahti
- Department of Cell and Molecular Biology, Karolinska InstitutetStockholmSweden
| | - Linda Gillberg
- Department of Cell and Molecular Biology, Karolinska InstitutetStockholmSweden
| | - Jesper Kjaer Jacobsen
- Department of Cell and Molecular Biology, Karolinska InstitutetStockholmSweden
- Department of Neurology, Karolinska University HospitalStockholmSweden
| | - Ioannis Mantas
- Department of Clinical Neuroscience, Karolinska InstitutetStockholmSweden
| | - Per Svenningsson
- Department of Clinical Neuroscience, Karolinska InstitutetStockholmSweden
| | - Thomas Perlmann
- Department of Cell and Molecular Biology, Karolinska InstitutetStockholmSweden
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2
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Bersani F, Picca F, Morena D, Righi L, Napoli F, Russo M, Oddo D, Rospo G, Negrino C, Castella B, Volante M, Listì A, Zambelli V, Benso F, Tabbò F, Bironzo P, Monteleone E, Poli V, Pietrantonio F, Di Nicolantonio F, Bardelli A, Ponzetto C, Novello S, Scagliotti GV, Taulli R. Exploring circular MET RNA as a potential biomarker in tumors exhibiting high MET activity. J Exp Clin Cancer Res 2023; 42:120. [PMID: 37170152 PMCID: PMC10176894 DOI: 10.1186/s13046-023-02690-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 04/27/2023] [Indexed: 05/13/2023] Open
Abstract
BACKGROUND MET-driven acquired resistance is emerging with unanticipated frequency in patients relapsing upon molecular therapy treatments. However, the determination of MET amplification remains challenging using both standard and next-generation sequencing-based methodologies. Liquid biopsy is an effective, non-invasive approach to define cancer genomic profiles, track tumor evolution over time, monitor treatment response and detect molecular resistance in advance. Circular RNAs (circRNAs), a family of RNA molecules that originate from a process of back-splicing, are attracting growing interest as potential novel biomarkers for their stability in body fluids. METHODS We identified a circRNA encoded by the MET gene (circMET) and exploited blood-derived cell-free RNA (cfRNA) and matched tumor tissues to identify, stratify and monitor advanced cancer patients molecularly characterized by high MET activity, generally associated with genomic amplification. RESULTS Using publicly available bioinformatic tools, we discovered that the MET locus transcribes several circRNA molecules, but only one candidate, circMET, was particularly abundant. Deeper molecular analysis revealed that circMET levels positively correlated with MET expression and activity, especially in MET-amplified cells. We developed a circMET-detection strategy and, in parallel, we performed standard FISH and IHC analyses in the same specimens to assess whether circMET quantification could identify patients displaying high MET activity. Longitudinal monitoring of circMET levels in the plasma of selected patients revealed the early emergence of MET amplification as a mechanism of acquired resistance to molecular therapies. CONCLUSIONS We found that measurement of circMET levels allows identification and tracking of patients characterized by high MET activity. Circulating circMET (ccMET) detection and analysis could be a simple, cost-effective, non-invasive approach to better implement patient stratification based on MET expression, as well as to dynamically monitor over time both therapy response and clonal evolution during treatment.
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Affiliation(s)
- Francesca Bersani
- Department of Oncology, University of Torino, Orbassano, Italy
- Center for Experimental Research and Medical Studies (CeRMS), AOU Città della Salute e della Scienza di Torino, Turin, Italy
| | - Francesca Picca
- Department of Oncology, University of Torino, Orbassano, Italy
- Center for Experimental Research and Medical Studies (CeRMS), AOU Città della Salute e della Scienza di Torino, Turin, Italy
| | - Deborah Morena
- Department of Oncology, University of Torino, Orbassano, Italy
- Center for Experimental Research and Medical Studies (CeRMS), AOU Città della Salute e della Scienza di Torino, Turin, Italy
| | - Luisella Righi
- Pathology Unit, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy
| | - Francesca Napoli
- Pathology Unit, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy
| | - Mariangela Russo
- Department of Oncology, University of Torino, Orbassano, Italy
- Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Italy
| | - Daniele Oddo
- Department of Oncology, University of Torino, Orbassano, Italy
- Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Italy
| | - Giuseppe Rospo
- Department of Oncology, University of Torino, Orbassano, Italy
- Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Italy
| | - Carola Negrino
- Department of Oncology, University of Torino, Orbassano, Italy
| | - Barbara Castella
- Center for Experimental Research and Medical Studies (CeRMS), AOU Città della Salute e della Scienza di Torino, Turin, Italy
- Laboratorio di Immunologia dei Tumori del Sangue (LITS), Centro Interdipartimentale di Ricerca in Biologia Molecolare (CIRBM), University of Torino, Turin, Italy
| | - Marco Volante
- Pathology Unit, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy
| | - Angela Listì
- Pathology Unit, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy
| | - Vanessa Zambelli
- Pathology Unit, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy
| | - Federica Benso
- Pathology Unit, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy
| | - Fabrizio Tabbò
- Thoracic Unit and Medical Oncology Division, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy
| | - Paolo Bironzo
- Thoracic Unit and Medical Oncology Division, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy
| | - Emanuele Monteleone
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Turin, Italy
- Università Vita-Salute San Raffaele, Milan, Italy
| | - Valeria Poli
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Turin, Italy
| | - Filippo Pietrantonio
- Medical Oncology Department, Fondazione IRCCS Istituto Nazionale Dei Tumori, Milan, Italy
- Department of Oncology and Hemato-Oncology, University of Milano, Milan, Italy
| | - Federica Di Nicolantonio
- Department of Oncology, University of Torino, Orbassano, Italy
- Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Italy
| | - Alberto Bardelli
- Department of Oncology, University of Torino, Orbassano, Italy
- IFOM, Istituto Fondazione di Oncologia Molecolare ETS, Milan, Italy
| | - Carola Ponzetto
- Department of Oncology, University of Torino, Orbassano, Italy
- Center for Experimental Research and Medical Studies (CeRMS), AOU Città della Salute e della Scienza di Torino, Turin, Italy
| | - Silvia Novello
- Thoracic Unit and Medical Oncology Division, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy
| | - Giorgio V Scagliotti
- Thoracic Unit and Medical Oncology Division, Department of Oncology at San Luigi Hospital, University of Torino, Orbassano, Italy.
| | - Riccardo Taulli
- Department of Oncology, University of Torino, Orbassano, Italy.
- Center for Experimental Research and Medical Studies (CeRMS), AOU Città della Salute e della Scienza di Torino, Turin, Italy.
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Hilscher MM, Gyllborg D, Yokota C, Nilsson M. In Situ Sequencing: A High-Throughput, Multi-Targeted Gene Expression Profiling Technique for Cell Typing in Tissue Sections. Methods Mol Biol 2020; 2148:313-329. [PMID: 32394391 DOI: 10.1007/978-1-0716-0623-0_20] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
Recent advances of image-based in situ mRNA quantification methods allow to visualize where in a tissue section a set of genes is expressed. It enables to map large numbers of genes in parallel and by capturing cellular boundaries allows to assign genes to cells. Here, we present a high-throughput, multi-targeted gene expression profiling technique called in situ sequencing that is capable of localizing hundreds of genes simultaneously and supports cell type classifications that follow transcriptome-based taxonomy. In situ sequencing is a targeted, amplified, and barcoded approach using padlock probes (PLPs) and rolling circle amplification (RCA). The current protocol relies on mRNA fixation, mRNA reverse transcription, residual mRNA degradation, and PLP hybridization. PLPs are amplified by RCA and labeled with fluorophore-conjugated probes, allowing their detection under conventional fluorescence microscopes.
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Affiliation(s)
- Markus M Hilscher
- Molecular Diagnostics, Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Solna, Sweden.
| | - Daniel Gyllborg
- Molecular Diagnostics, Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Solna, Sweden
| | - Chika Yokota
- Molecular Diagnostics, Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Solna, Sweden.,In situ sequencing facility, Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Solna, Sweden
| | - Mats Nilsson
- Molecular Diagnostics, Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Solna, Sweden
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Qualifying antibodies for image-based immune profiling and multiplexed tissue imaging. Nat Protoc 2019; 14:2900-2930. [PMID: 31534232 DOI: 10.1038/s41596-019-0206-y] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 06/03/2019] [Indexed: 12/27/2022]
Abstract
Multiplexed tissue imaging enables precise, spatially resolved enumeration and characterization of cell types and states in human resection specimens. A growing number of methods applicable to formalin-fixed, paraffin-embedded (FFPE) tissue sections have been described, the majority of which rely on antibodies for antigen detection and mapping. This protocol provides step-by-step procedures for confirming the selectivity and specificity of antibodies used in fluorescence-based tissue imaging and for the construction and validation of antibody panels. Although the protocol is implemented using tissue-based cyclic immunofluorescence (t-CyCIF) as an imaging platform, these antibody-testing methods are broadly applicable. We demonstrate assembly of a 16-antibody panel for enumerating and localizing T cells and B cells, macrophages, and cells expressing immune checkpoint regulators. The protocol is accessible to individuals with experience in microscopy and immunofluorescence; some experience in computation is required for data analysis. A typical 30-antibody dataset for 20 FFPE slides can be generated within 2 weeks.
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Sharafdarkolaee SH, Gill P, Motovali-Bashi M, Sharafdarkolaee FH. Isothermal Amplification Methods for the SNP Genotyping. Curr Mol Med 2019; 19:461-472. [PMID: 31131752 DOI: 10.2174/1566524019666190527083947] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Revised: 06/30/2018] [Accepted: 04/23/2019] [Indexed: 12/20/2022]
Abstract
The demands for genotyping techniques with acceptable precision, accuracy, cost-effectiveness in high throughput formats made driving forces for continuous development of novel technologies. A wide range of mutation detection techniques based on polymerase chain reaction (PCR) have been introduced. The best alternatives were the isothermal amplification technologies that those did not require a thermal cycler. In this review, we aimed to describe the most known isothermal amplification techniques for SNP genotyping.
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Affiliation(s)
| | - Pooria Gill
- Nanomedicine Group, Immunogenetics Research Center, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran.,The Health of Plant and Livestock Products Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Majid Motovali-Bashi
- Department of Genetics, Faculty of Sciences, University of Isfahan, Isfahan, Iran
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Andreassi C, Crerar H, Riccio A. Post-transcriptional Processing of mRNA in Neurons: The Vestiges of the RNA World Drive Transcriptome Diversity. Front Mol Neurosci 2018; 11:304. [PMID: 30210293 PMCID: PMC6121099 DOI: 10.3389/fnmol.2018.00304] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 08/09/2018] [Indexed: 12/17/2022] Open
Abstract
Neurons are morphologically complex cells that rely on the compartmentalization of protein expression to develop and maintain their extraordinary cytoarchitecture. This formidable task is achieved, at least in part, by targeting mRNA to subcellular compartments where they are rapidly translated. mRNA transcripts are the conveyor of genetic information from DNA to the translational machinery, however, they are also endowed with additional functions linked to both the coding sequence (open reading frame, or ORF) and the flanking 5′ and 3′ untranslated regions (UTRs), that may harbor coding-independent functions. In this review, we will highlight recent evidences supporting new coding-dependent and -independent functions of mRNA and discuss how nuclear and cytoplasmic post-transcriptional modifications of mRNA contribute to localization and translation in mammalian cells with specific emphasis on neurons. We also describe recently developed techniques that can be employed to study RNA dynamics at subcellular level in eukaryotic cells in developing and regenerating neurons.
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Affiliation(s)
- Catia Andreassi
- MRC Laboratory for Molecular Cell Biology, University College London, London, United Kingdom
| | - Hamish Crerar
- MRC Laboratory for Molecular Cell Biology, University College London, London, United Kingdom
| | - Antonella Riccio
- MRC Laboratory for Molecular Cell Biology, University College London, London, United Kingdom
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Ishigaki Y, Sato K. Effects of Microchannel Shape and Ultrasonic Mixing on Microfluidic Padlock Probe Rolling Circle Amplification (RCA) Reactions. MICROMACHINES 2018; 9:mi9060272. [PMID: 30424205 PMCID: PMC6187661 DOI: 10.3390/mi9060272] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 05/22/2018] [Accepted: 05/29/2018] [Indexed: 01/17/2023]
Abstract
The fluorescence in situ hybridization (FISH)-based padlock probe and rolling circle amplification (RCA) method allows for the detection of point mutations. However, it requires multiple reaction steps and solution exchanges, making it costly, labor-intensive, and time-consuming. In this study, we aimed to improve the efficiency of padlock/RCA by determining the effects of microchannel shape and ultrasonic solution mixing. Using a circular-shaped microchamber and ultrasonic mixing, the efficiency of microfluidic padlock/RCA was improved, and the consumption of the expensive probe solution was reduced from 10 µL to approximately 3.5 µL. Moreover, the fluorescent probe hybridization time was reduced to 5 min, which is four times faster than that of the standard protocol. We used this method to successfully detect mitochondrial DNA and transcripts of β-actin and K-ras proto-oncogene codon 12 in cells. Our method offers improvements over current padlock/RCA methods and will be helpful in optimizing other microfluidics-based FISH-related analyses.
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Affiliation(s)
- Yuri Ishigaki
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Bunkyo, Tokyo 112-8681, Japan.
| | - Kae Sato
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Bunkyo, Tokyo 112-8681, Japan.
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8
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Kristoffersen EL, Givskov A, Jørgensen LA, Jensen PW, W Byl JA, Osheroff N, Andersen AH, Stougaard M, Ho YP, Knudsen BR. Interlinked DNA nano-circles for measuring topoisomerase II activity at the level of single decatenation events. Nucleic Acids Res 2017; 45:7855-7869. [PMID: 28541438 PMCID: PMC5570003 DOI: 10.1093/nar/gkx480] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 05/22/2017] [Indexed: 12/23/2022] Open
Abstract
DNA nano-structures present appealing new means for monitoring different molecules. Here, we demonstrate the assembly and utilization of a surface-attached double-stranded DNA catenane composed of two intact interlinked DNA nano-circles for specific and sensitive measurements of the life essential topoisomerase II (Topo II) enzyme activity. Topo II activity was detected via the numeric release of DNA nano-circles, which were visualized at the single-molecule level in a fluorescence microscope upon isothermal amplification and fluorescence labeling. The transition of each enzymatic reaction to a micrometer sized labeled product enabled quantitative detection of Topo II activity at the single decatenation event level rendering activity measurements in extracts from as few as five cells possible. Topo II activity is a suggested predictive marker in cancer therapy and, consequently, the described highly sensitive monitoring of Topo II activity may add considerably to the toolbox of individualized medicine where decisions are based on very sparse samples.
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Affiliation(s)
- Emil L Kristoffersen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark.,Interdisciplinary Nanoscience Center - iNANO, Aarhus University, 8000 Aarhus C, Denmark
| | - Asger Givskov
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
| | - Line A Jørgensen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
| | - Pia W Jensen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
| | - Jo Ann W Byl
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Neil Osheroff
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.,VA Tennessee Valley Healthcare System, Nashville, TN 37212, USA
| | - Anni H Andersen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
| | - Magnus Stougaard
- Department of Pathology, Aarhus University Hospital, 8000 Aarhus C, Denmark
| | - Yi-Ping Ho
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark.,Interdisciplinary Nanoscience Center - iNANO, Aarhus University, 8000 Aarhus C, Denmark.,Division of Biomedical Engineering, Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China
| | - Birgitta R Knudsen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark.,Interdisciplinary Nanoscience Center - iNANO, Aarhus University, 8000 Aarhus C, Denmark
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Simultaneous Single-Cell In Situ Analysis of Human Adenovirus Type 5 DNA and mRNA Expression Patterns in Lytic and Persistent Infection. J Virol 2017; 91:JVI.00166-17. [PMID: 28298601 DOI: 10.1128/jvi.00166-17] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 03/06/2017] [Indexed: 12/14/2022] Open
Abstract
An efficient adenovirus infection results in high-level accumulation of viral DNA and mRNAs in the infected cell population. However, the average viral DNA and mRNA content in a heterogeneous cell population does not necessarily reflect the same abundance in individual cells. Here, we describe a novel padlock probe-based rolling-circle amplification technique that enables simultaneous detection and analysis of human adenovirus type 5 (HAdV-5) genomic DNA and virus-encoded mRNAs in individual infected cells. We demonstrate that the method is applicable for detection and quantification of HAdV-5 DNA and mRNAs in short-term infections in human epithelial cells and in long-term infections in human B lymphocytes. Single-cell evaluation of these infections revealed high heterogeneity and unique cell subpopulations defined by differential viral DNA content and mRNA expression. Further, our single-cell analysis shows that the specific expression pattern of viral E1A 13S and 12S mRNA splice variants is linked to HAdV-5 DNA content in the individual cells. Furthermore, we show that expression of a mature form of the HAdV-5 histone-like protein VII affects virus genome detection in HAdV-5-infected cells. Collectively, padlock probes combined with rolling-circle amplification should be a welcome addition to the method repertoire for the characterization of the molecular details of the HAdV life cycle in individual infected cells.IMPORTANCE Human adenoviruses (HAdVs) have been extensively used as model systems to study various aspects of eukaryotic gene expression and genome organization. The vast majority of the HAdV studies are based on standard experimental procedures carried out using heterogeneous cell populations, where data averaging often masks biological differences. As every cell is unique, characteristics and efficiency of an HAdV infection can vary from cell to cell. Therefore, the analysis of HAdV gene expression and genome organization would benefit from a method that permits analysis of individual infected cells in the heterogeneous cell population. Here, we show that the padlock probe-based rolling-circle amplification method can be used to study concurrent viral DNA accumulation and mRNA expression patterns in individual HAdV-5-infected cells. Hence, this versatile method can be applied to detect the extent of infection and virus gene expression changes in different HAdV-5 infections.
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