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Huang X, Fu Y, Lee H, Zhao Y, Yang W, van de Leemput J, Han Z. Single-cell profiling of the developing embryonic heart in Drosophila. Development 2023; 150:dev201936. [PMID: 37526610 PMCID: PMC10482008 DOI: 10.1242/dev.201936] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 07/20/2023] [Indexed: 08/02/2023]
Abstract
Drosophila is an important model for studying heart development and disease. Yet, single-cell transcriptomic data of its developing heart have not been performed. Here, we report single-cell profiling of the entire fly heart using ∼3000 Hand-GFP embryos collected at five consecutive developmental stages, ranging from bilateral migrating rows of cardiac progenitors to a fused heart tube. The data revealed six distinct cardiac cell types in the embryonic fly heart: cardioblasts, both Svp+ and Tin+ subtypes; and five types of pericardial cell (PC) that can be distinguished by four key transcription factors (Eve, Odd, Ct and Tin) and include the newly described end of the line PC. Notably, the embryonic fly heart combines transcriptional signatures of the mammalian first and second heart fields. Using unique markers for each heart cell type, we defined their number and location during heart development to build a comprehensive 3D cell map. These data provide a resource to track the expression of any gene in the developing fly heart, which can serve as a reference to study genetic perturbations and cardiac diseases.
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Affiliation(s)
- Xiaohu Huang
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Yulong Fu
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Hangnoh Lee
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Yunpo Zhao
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Wendy Yang
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Joyce van de Leemput
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Zhe Han
- Center for Precision Disease Modeling, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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Breznak SM, Peng Y, Deng L, Kotb NM, Flamholz Z, Rapisarda IT, Martin ET, LaBarge KA, Fabris D, Gavis ER, Rangan P. H/ACA snRNP-dependent ribosome biogenesis regulates translation of polyglutamine proteins. SCIENCE ADVANCES 2023; 9:eade5492. [PMID: 37343092 PMCID: PMC10284551 DOI: 10.1126/sciadv.ade5492] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 05/17/2023] [Indexed: 06/23/2023]
Abstract
Stem cells in many systems, including Drosophila germline stem cells (GSCs), increase ribosome biogenesis and translation during terminal differentiation. Here, we show that the H/ACA small nuclear ribonucleoprotein (snRNP) complex that promotes pseudouridylation of ribosomal RNA (rRNA) and ribosome biogenesis is required for oocyte specification. Reducing ribosome levels during differentiation decreased the translation of a subset of messenger RNAs that are enriched for CAG trinucleotide repeats and encode polyglutamine-containing proteins, including differentiation factors such as RNA-binding Fox protein 1. Moreover, ribosomes were enriched at CAG repeats within transcripts during oogenesis. Increasing target of rapamycin (TOR) activity to elevate ribosome levels in H/ACA snRNP complex-depleted germlines suppressed the GSC differentiation defects, whereas germlines treated with the TOR inhibitor rapamycin had reduced levels of polyglutamine-containing proteins. Thus, ribosome biogenesis and ribosome levels can control stem cell differentiation via selective translation of CAG repeat-containing transcripts.
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Affiliation(s)
- Shane M. Breznak
- Department of Biological Sciences, RNA Institute, University at Albany, 1400 Washington Avenue, LSRB 2033D, Albany, NY 12222, USA
| | - Yingshi Peng
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA
| | - Limin Deng
- Department of Biological Sciences, RNA Institute, University at Albany, 1400 Washington Avenue, LSRB 2033D, Albany, NY 12222, USA
- Department of Chemistry, University of Connecticut, 55N Eagleville Rd, Storrs, CT 06269, USA
| | - Noor M. Kotb
- Department of Biological Sciences, RNA Institute, University at Albany, 1400 Washington Avenue, LSRB 2033D, Albany, NY 12222, USA
- Department of Biomedical Sciences, University at Albany School of Public Health, Albany, NY 12144, USA
| | - Zachary Flamholz
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA
| | - Ian T. Rapisarda
- Department of Biological Sciences, RNA Institute, University at Albany, 1400 Washington Avenue, LSRB 2033D, Albany, NY 12222, USA
- Lake Erie College of Osteopathic Medicine, College of Medicine, 1858 W Grandview Blvd, Erie, PA 16509, USA
| | - Elliot T. Martin
- Department of Biological Sciences, RNA Institute, University at Albany, 1400 Washington Avenue, LSRB 2033D, Albany, NY 12222, USA
| | - Kara A. LaBarge
- Department of Biological Sciences, RNA Institute, University at Albany, 1400 Washington Avenue, LSRB 2033D, Albany, NY 12222, USA
| | - Dan Fabris
- Department of Biological Sciences, RNA Institute, University at Albany, 1400 Washington Avenue, LSRB 2033D, Albany, NY 12222, USA
- Department of Chemistry, University of Connecticut, 55N Eagleville Rd, Storrs, CT 06269, USA
| | - Elizabeth R. Gavis
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA
| | - Prashanth Rangan
- Department of Biological Sciences, RNA Institute, University at Albany, 1400 Washington Avenue, LSRB 2033D, Albany, NY 12222, USA
- Black Family Stem Cell Institute, Department of Cell, Developmental, and Regenerative Biology, Icahn School of Medicine at Mount Sinai, 1 Gustave L. Levy Place, New York, NY 10029, USA
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Breznak SM, Kotb NM, Rangan P. Dynamic regulation of ribosome levels and translation during development. Semin Cell Dev Biol 2023; 136:27-37. [PMID: 35725716 DOI: 10.1016/j.semcdb.2022.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 05/20/2022] [Accepted: 06/12/2022] [Indexed: 01/11/2023]
Abstract
The ability of ribosomes to translate mRNAs into proteins is the basis of all life. While ribosomes are essential for cell viability, reduction in levels of ribosomes can affect cell fate and developmental transitions in a tissue specific manner and can cause a plethora of related diseases called ribosomopathies. How dysregulated ribosomes homeostasis influences cell fate and developmental transitions is not fully understood. Model systems such as Drosophila and C. elegans oogenesis have been used to address these questions since defects in conserved steps in ribosome biogenesis result in stem cell differentiation and developmental defects. In this review, we first explore how ribosome levels affect stem cell differentiation. Second, we describe how ribosomal modifications and incorporation of ribosomal protein paralogs contribute to development. Third, we summarize how cells with perturbed ribosome biogenesis are sensed and eliminated during organismal growth.
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Affiliation(s)
- Shane M Breznak
- Department of Biological Sciences/RNA Institute, University at Albany SUNY, Albany, NY, 12222, USA
| | - Noor M Kotb
- Department of Biomedical Sciences, The School of Public Health, University at Albany SUNY, 11 Albany, NY 12222, USA
| | - Prashanth Rangan
- Department of Cell, Developmental, and Regenerative Biology, Black Family Stem Cell Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
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Downregulation of snoRNA SNORA52 and Its Clinical Significance in Hepatocellular Carcinoma. BIOMED RESEARCH INTERNATIONAL 2021; 2021:7020637. [PMID: 34195281 PMCID: PMC8203349 DOI: 10.1155/2021/7020637] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 05/02/2021] [Accepted: 05/15/2021] [Indexed: 12/12/2022]
Abstract
Hepatocellular carcinoma (HCC) is one of the most common and aggressive tumors in the world while the accuracy of the present tests for detecting HCC is poor. A novel diagnostic and prognostic biomarker for HCC is urgently needed. Overwhelming evidence has demonstrated the regulatory roles of small nucleolar RNA (snoRNA) in carcinogenesis. This study is aimed at analyzing the expression of a snoRNA, SNORA52, in HCC and exploring the correlation between its expression and various clinical characteristics of HCC patients. By using quantitative real-time PCR, we found that SNORA52 was downregulated in HCC cell lines (P < 0.05) and HCC tissues (P < 0.001). Correlation analysis showed that the expression of SNORA52 was obviously associated with tumor size (P = 0.011), lesion number (P = 0.007), capsular invasion (P = 0.011), tumor differentiation degree (P = 0.046), and TNM stage (P = 0.004). The disease-free survival (DFS) and overall survival (OS) analysis showed that patients with lower SNORA52 expression had a worse prognosis (P < 0.001). Univariate and multivariate Cox regression analysis showed that SNORA52 expression was a completely independent prognostic factor to predict DFS (P = 0.009) and OS (P = 0.012) of HCC patients. Overall, our findings showed SNORA52 expression levels were downregulated in HCC tissues and correlated with multiple clinical variables, and SNORA52 was an independent prognostic factor for HCC patients, which suggested that SNORA52 could function as a potential diagnostic and prognostic biomarker for HCC patients.
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Blatt P, Martin ET, Breznak SM, Rangan P. Post-transcriptional gene regulation regulates germline stem cell to oocyte transition during Drosophila oogenesis. Curr Top Dev Biol 2019; 140:3-34. [PMID: 32591078 DOI: 10.1016/bs.ctdb.2019.10.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
During oogenesis, several developmental processes must be traversed to ensure effective completion of gametogenesis including, stem cell maintenance and asymmetric division, differentiation, mitosis and meiosis, and production of maternally contributed mRNAs, making the germline a salient model for understanding how cell fate transitions are mediated. Due to silencing of the genome during meiotic divisions, there is little instructive transcription, barring a few examples, to mediate these critical transitions. In Drosophila, several layers of post-transcriptional regulation ensure that the mRNAs required for these processes are expressed in a timely manner and as needed during germline differentiation. These layers of regulation include alternative splicing, RNA modification, ribosome production, and translational repression. Many of the molecules and pathways involved in these regulatory activities are conserved from Drosophila to humans making the Drosophila germline an elegant model for studying the role of post-transcriptional regulation during stem cell differentiation and meiosis.
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Affiliation(s)
- Patrick Blatt
- Department of Biological Sciences/RNA Institute, University at Albany SUNY, Albany, NY, United States; University at Albany SUNY, Albany, NY, United States
| | - Elliot T Martin
- Department of Biological Sciences/RNA Institute, University at Albany SUNY, Albany, NY, United States; University at Albany SUNY, Albany, NY, United States
| | - Shane M Breznak
- Department of Biological Sciences/RNA Institute, University at Albany SUNY, Albany, NY, United States; University at Albany SUNY, Albany, NY, United States
| | - Prashanth Rangan
- Department of Biological Sciences/RNA Institute, University at Albany SUNY, Albany, NY, United States; University at Albany SUNY, Albany, NY, United States.
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