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Bondarenko SM, Liang J, Sharakhova MV, Sharakhov IV. Visualization of Polytene Chromatin in Mosquito Cell Nuclei Using Three-Dimensional Fluorescence In Situ Hybridization. Cold Spring Harb Protoc 2022; 2022:599-605. [PMID: 35960625 DOI: 10.1101/pdb.prot107873] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Chromosomes are intricately folded within the cell nucleus and interact with peripheral nuclear proteins. The chromatin architecture has a profound effect on how the genome is organized. 3D-FISH is a powerful technique that can reveal the structural and functional organization of chromosomes in the nuclear space. Here, we present a protocol for visualizing specific genomic regions in whole-mount paraformaldehyde-fixed cell nuclei of Anopheles mosquitoes. This protocol was tested in our laboratories and has been showed to be effective and reliable for visualizing genomic regions of various lengths-from 1-kb gene-scale fragments to chromosome-scale segments of DNA.
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Affiliation(s)
- Simon M Bondarenko
- Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, USA.,Department of Genetics and Cell Biology, Tomsk State University, Tomsk 634050, Russia
| | - Jiangtao Liang
- Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, USA
| | - Maria V Sharakhova
- Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, USA.,Laboratory of Evolutionary Genomics of Insects, Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - Igor V Sharakhov
- Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, USA .,Department of Genetics and Cell Biology, Tomsk State University, Tomsk 634050, Russia
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2
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Chiu M, Trigg B, Taracena M, Wells M. Diverse cellular morphologies during lumen maturation in Anopheles gambiae larval salivary glands. INSECT MOLECULAR BIOLOGY 2021; 30:210-230. [PMID: 33305876 PMCID: PMC8142555 DOI: 10.1111/imb.12689] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 10/29/2020] [Accepted: 12/07/2020] [Indexed: 06/12/2023]
Abstract
Mosquitoes are the greatest animal threat to human health, causing hundreds of millions of infections and around 1 million deaths each year. All mosquito-borne pathogens must traverse the salivary glands (SGs) to be transmitted to the next host, making this organ an ideal target for interventions. The adult SG develops from precursor cells located in the larval SG duct bud. Characterization of the larval SG has been limited. We sought to better understand larval SG architecture, secretion and gene expression. We developed an optimized method for larval SG staining and surveyed hundreds of larval stage 4 (L4) SGs using fluorescence confocal microscopy. Remarkable variation in SG cell and chromatin organization differed among individuals and across the L4 stage. Lumen formation occurred during L4 stage through secretion likely involving a coincident cellular apical lipid enrichment and extracellular vesicle-like structures. Meta-analysis of microarray data showed that larval SG gene expression is divergent from adult SGs, more similar to larval gastric cecae, but different from other larval gut compartments. This work highlights the variable cell architecture of larval Anopheles gambiae SGs and provides candidate targets for genetic strategies aiming to disrupt SGs and transmission of mosquito-borne pathogens.
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Affiliation(s)
- M Chiu
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- The Johns Hopkins Malaria Research Institute, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - B Trigg
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- The Johns Hopkins Malaria Research Institute, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - M Taracena
- Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, USA
| | - M Wells
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- The Johns Hopkins Malaria Research Institute, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of Biomedical Sciences, Idaho College of Osteopathic Medicine (ICOM), Meridian, Idaho, USA
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Maki K, Nava MM, Villeneuve C, Chang M, Furukawa KS, Ushida T, Wickström SA. Hydrostatic pressure prevents chondrocyte differentiation through heterochromatin remodeling. J Cell Sci 2021; 134:224090. [PMID: 33310912 PMCID: PMC7860130 DOI: 10.1242/jcs.247643] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 12/01/2020] [Indexed: 01/03/2023] Open
Abstract
Articular cartilage protects and lubricates joints for smooth motion and transmission of loads. Owing to its high water content, chondrocytes within the cartilage are exposed to high levels of hydrostatic pressure, which has been shown to promote chondrocyte identity through unknown mechanisms. Here, we investigate the effects of hydrostatic pressure on chondrocyte state and behavior, and discover that application of hydrostatic pressure promotes chondrocyte quiescence and prevents maturation towards the hypertrophic state. Mechanistically, hydrostatic pressure reduces the amount of trimethylated H3K9 (K3K9me3)-marked constitutive heterochromatin and concomitantly increases H3K27me3-marked facultative heterochromatin. Reduced levels of H3K9me3 attenuates expression of pre-hypertrophic genes, replication and transcription, thereby reducing replicative stress. Conversely, promoting replicative stress by inhibition of topoisomerase II decreases Sox9 expression, suggesting that it enhances chondrocyte maturation. Our results reveal how hydrostatic pressure triggers chromatin remodeling to impact cell fate and function. This article has an associated First Person interview with the first author of the paper. Highlighted Article: Hydrostatic pressure promotes chondrocyte quiescence and immature chondrocyte state through reducing the amount of H3K9me3-marked heterochromatin.
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Affiliation(s)
- Koichiro Maki
- Helsinki Institute of Life Science, Biomedicum, University of Helsinki, 00290 Helsinki, Finland.,Wihuri Research Institute, Biomedicum, University of Helsinki, 00290 Helsinki, Finland.,Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, 00290 Helsinki, Finland.,Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-0033, Japan
| | - Michele M Nava
- Helsinki Institute of Life Science, Biomedicum, University of Helsinki, 00290 Helsinki, Finland.,Wihuri Research Institute, Biomedicum, University of Helsinki, 00290 Helsinki, Finland.,Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, 00290 Helsinki, Finland.,Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany
| | - Clémentine Villeneuve
- Helsinki Institute of Life Science, Biomedicum, University of Helsinki, 00290 Helsinki, Finland.,Wihuri Research Institute, Biomedicum, University of Helsinki, 00290 Helsinki, Finland.,Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, 00290 Helsinki, Finland
| | - Minki Chang
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-0033, Japan
| | - Katsuko S Furukawa
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-0033, Japan
| | - Takashi Ushida
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-0033, Japan
| | - Sara A Wickström
- Helsinki Institute of Life Science, Biomedicum, University of Helsinki, 00290 Helsinki, Finland .,Wihuri Research Institute, Biomedicum, University of Helsinki, 00290 Helsinki, Finland.,Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, 00290 Helsinki, Finland.,Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany.,Cologne Excellence Cluster for Stress Responses in Ageing-associated diseases (CECAD), University of Cologne, 50931 Cologne, Germany
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George P, Kinney NA, Liang J, Onufriev AV, Sharakhov IV. Three-dimensional Organization of Polytene Chromosomes in Somatic and Germline Tissues of Malaria Mosquitoes. Cells 2020; 9:cells9020339. [PMID: 32024176 PMCID: PMC7072178 DOI: 10.3390/cells9020339] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/22/2020] [Accepted: 01/28/2020] [Indexed: 12/17/2022] Open
Abstract
Spatial organization of chromosome territories and interactions between interphase chromosomes themselves, as well as with the nuclear periphery, play important roles in epigenetic regulation of the genome function. However, the interplay between inter-chromosomal contacts and chromosome-nuclear envelope attachments in an organism’s development is not well-understood. To address this question, we conducted microscopic analyses of the three-dimensional chromosome organization in malaria mosquitoes. We employed multi-colored oligonucleotide painting probes, spaced 1 Mb apart along the euchromatin, to quantitatively study chromosome territories in larval salivary gland cells and adult ovarian nurse cells of Anopheles gambiae, An. coluzzii, and An. merus. We found that the X chromosome territory has a significantly smaller volume and is more compact than the autosomal arm territories. The number of inter-chromosomal, and the percentage of the chromosome–nuclear envelope, contacts were conserved among the species within the same cell type. However, the percentage of chromosome regions located at the nuclear periphery was typically higher, while the number of inter-chromosomal contacts was lower, in salivary gland cells than in ovarian nurse cells. The inverse correlation was considerably stronger for the autosomes. Consistent with previous theoretical arguments, our data indicate that, at the genome-wide level, there is an inverse relationship between chromosome-nuclear envelope attachments and chromosome–chromosome interactions, which is a key feature of the cell type-specific nuclear architecture.
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Affiliation(s)
- Phillip George
- Department of Entomology, Virginia Tech, Blacksburg, VA 24061, USA; (P.G.); (J.L.)
| | - Nicholas A. Kinney
- Genomics, Bioinformatics and Computational Biology, Virginia Tech, Blacksburg, VA 24061, USA; (N.A.K.); (A.V.O.)
| | - Jiangtao Liang
- Department of Entomology, Virginia Tech, Blacksburg, VA 24061, USA; (P.G.); (J.L.)
| | - Alexey V. Onufriev
- Genomics, Bioinformatics and Computational Biology, Virginia Tech, Blacksburg, VA 24061, USA; (N.A.K.); (A.V.O.)
- Department of Computer Science, Virginia Tech, Blacksburg, VA 24061, USA
| | - Igor V. Sharakhov
- Department of Entomology, Virginia Tech, Blacksburg, VA 24061, USA; (P.G.); (J.L.)
- Genomics, Bioinformatics and Computational Biology, Virginia Tech, Blacksburg, VA 24061, USA; (N.A.K.); (A.V.O.)
- Department of Cytology and Genetics, Tomsk State University, 634050 Tomsk, Russian Federation
- Correspondence: ; Tel.: +1-540-231-7316
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