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Olivieri JE, Dehghannasiri R, Wang PL, Jang S, de Morree A, Tan SY, Ming J, Ruohao Wu A, Quake SR, Krasnow MA, Salzman J. RNA splicing programs define tissue compartments and cell types at single-cell resolution. eLife 2021; 10:e70692. [PMID: 34515025 PMCID: PMC8563012 DOI: 10.7554/elife.70692] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 09/10/2021] [Indexed: 02/05/2023] Open
Abstract
The extent splicing is regulated at single-cell resolution has remained controversial due to both available data and methods to interpret it. We apply the SpliZ, a new statistical approach, to detect cell-type-specific splicing in >110K cells from 12 human tissues. Using 10X Chromium data for discovery, 9.1% of genes with computable SpliZ scores are cell-type-specifically spliced, including ubiquitously expressed genes MYL6 and RPS24. These results are validated with RNA FISH, single-cell PCR, and Smart-seq2. SpliZ analysis reveals 170 genes with regulated splicing during human spermatogenesis, including examples conserved in mouse and mouse lemur. The SpliZ allows model-based identification of subpopulations indistinguishable based on gene expression, illustrated by subpopulation-specific splicing of classical monocytes involving an ultraconserved exon in SAT1. Together, this analysis of differential splicing across multiple organs establishes that splicing is regulated cell-type-specifically.
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Affiliation(s)
- Julia Eve Olivieri
- Institute for Computational and Mathematical Engineering, Stanford UniversityStanfordUnited States
- Department of Biomedical Data Science, Stanford UniversityStanfordUnited States
- Department of Biochemistry, Stanford UniversityStanfordUnited States
| | - Roozbeh Dehghannasiri
- Department of Biomedical Data Science, Stanford UniversityStanfordUnited States
- Department of Biochemistry, Stanford UniversityStanfordUnited States
| | - Peter L Wang
- Department of Biochemistry, Stanford UniversityStanfordUnited States
| | - SoRi Jang
- Department of Biochemistry, Stanford UniversityStanfordUnited States
| | - Antoine de Morree
- Department of Neurology and Neurological Sciences, Stanford University School of MedicineStanfordUnited States
| | - Serena Y Tan
- Department of Pathology, Stanford University Medical CenterStanfordUnited States
| | - Jingsi Ming
- Academy for Statistics and Interdisciplinary Sciences, Faculty of Economics and Management,East China Normal UniversityShanghaiChina
- Department of Mathematics, The Hong Kong University of Science and TechnologyHong KongChina
| | - Angela Ruohao Wu
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and TechnologyHong KongChina
| | - Stephen R Quake
- Chan Zuckerberg BiohubSan FranciscoUnited States
- Department of Bioengineering, Stanford UniversityStanfordUnited States
| | - Mark A Krasnow
- Department of Biochemistry, Stanford UniversityStanfordUnited States
| | - Julia Salzman
- Department of Biomedical Data Science, Stanford UniversityStanfordUnited States
- Department of Biochemistry, Stanford UniversityStanfordUnited States
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Kelemen O, Convertini P, Zhang Z, Wen Y, Shen M, Falaleeva M, Stamm S. Function of alternative splicing. Gene 2013; 514:1-30. [PMID: 22909801 PMCID: PMC5632952 DOI: 10.1016/j.gene.2012.07.083] [Citation(s) in RCA: 504] [Impact Index Per Article: 45.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Revised: 07/21/2012] [Accepted: 07/30/2012] [Indexed: 12/15/2022]
Abstract
Almost all polymerase II transcripts undergo alternative pre-mRNA splicing. Here, we review the functions of alternative splicing events that have been experimentally determined. The overall function of alternative splicing is to increase the diversity of mRNAs expressed from the genome. Alternative splicing changes proteins encoded by mRNAs, which has profound functional effects. Experimental analysis of these protein isoforms showed that alternative splicing regulates binding between proteins, between proteins and nucleic acids as well as between proteins and membranes. Alternative splicing regulates the localization of proteins, their enzymatic properties and their interaction with ligands. In most cases, changes caused by individual splicing isoforms are small. However, cells typically coordinate numerous changes in 'splicing programs', which can have strong effects on cell proliferation, cell survival and properties of the nervous system. Due to its widespread usage and molecular versatility, alternative splicing emerges as a central element in gene regulation that interferes with almost every biological function analyzed.
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Affiliation(s)
- Olga Kelemen
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, United States of America
| | - Paolo Convertini
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, United States of America
| | - Zhaiyi Zhang
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, United States of America
| | - Yuan Wen
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, United States of America
| | - Manli Shen
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, United States of America
| | - Marina Falaleeva
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, United States of America
| | - Stefan Stamm
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, United States of America
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Chang MT, Cheng YS, Huang MC. A novel SNP of the PNRC1 gene and its association with reproductive traits in Tsaiya ducks. Theriogenology 2012; 78:140-6. [PMID: 22494678 DOI: 10.1016/j.theriogenology.2012.01.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Revised: 01/28/2012] [Accepted: 01/28/2012] [Indexed: 10/28/2022]
Abstract
Proline-rich nuclear receptor coactivator (PNRC)1 is a member of a new family of nuclear receptor coactivators capable of potentiating the transcriptional activity of nuclear receptors. The objective was to investigate the relationship between PNRC1 genotypes of single nucleotide polymorphism (SNP) and reproductive traits in ducks. Brown Tsaiya ducks (N = 305) from two lines, a control line with no selection and the selected line, were used. Polymerase chain reaction-single strand polymorphism and DNA sequencing were done to screen polymorphisms of the PNRC1 gene. A novel SNP (G98T) in 3'-untranslated region of the PNRC1 gene was identified and resulted in two genotypes, GG and GT. The frequencies of genotype GG and allele G were higher in both lines investigated. Regarding egg weight at first egg (EWFE), based on SNP trait association analysis, ducks with the GG genotype had a 4.48 g per egg greater egg weight at first egg when compared with ducks of the GT genotype in the control line (P < 0.05). In addition, this SNP was associated with the hatchability rate (HR) in the selected line; ducks with the GT genotype had a 6.70% higher hatchability rate than those with the GG genotype (P < 0.05). Therefore, we inferred that the PNRC1 gene could be a candidate locus or linked to a major gene that influenced egg weight-related and hatchability traits in Tsaiya ducks. Further investigations on additional duck populations with larger sample sizes are needed to confirm these results.
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Affiliation(s)
- M-T Chang
- Department of Animal Science, National Chung Hsing University, Taichung, Taiwan
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Wang Y, Chen B, Li Y, Zhou D, Chen S. PNRC accumulates in the nucleolus by interaction with B23/nucleophosmin via its nucleolar localization sequence. BIOCHIMICA ET BIOPHYSICA ACTA 2011; 1813:109-19. [PMID: 20888865 PMCID: PMC3085350 DOI: 10.1016/j.bbamcr.2010.09.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2010] [Revised: 09/22/2010] [Accepted: 09/23/2010] [Indexed: 11/27/2022]
Abstract
PNRC (proline-rich nuclear receptor coregulatory protein) was primarily identified as a coactivator of nuclear receptors (NRs) by our laboratory, which enhances NR-mediated transcription by RNA polymerase II. Recent study has shown that PNRC also stimulates RNA polymerase III-dependent transcription through interaction with the subunit RPC39 of RNA polymerase III. Here, we report that PNRC accumulates in the nucleolus and its depletion by small interfering RNA (siRNA) impairs pre-rRNA transcription by RNA polymerase I. We identified the sequence at position 94-101 ((94)PKKRRKKK(101)) of PNRC as its nucleolar localization sequence (NoLS). Fusion of this sequence to GFP directed GFP to the nucleolus. Characterization of the NoLS revealed that the stretches of six successive basic residues are sufficient to function as a NoLS. Through co-immunoprecipitation assay, we demonstrated that the NoLS is necessary and sufficient to mediate the association of PNRC with B23/nucleophosmin. Moreover, B23 depletion by siRNA disrupted the accumulation of PNRC in the nucleolus. Together, our study indicates that PNRC is a novel nucleolar protein that might be involved in regulation of pre-rRNA synthesis, and it localizes to the nucleolus by interaction with B23 via its NoLS. Our study also suggests that the stretches of six successive basic residues (lysine and/or arginine) could function as NoLS.
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Affiliation(s)
- Yuanzhong Wang
- Division of Tumor Cell Biology, City of Hope National Medical Center and Beckman Research Institute, Duarte, CA 91010, USA
- Department of Biochemistry and Molecular Biology, Third Military Medical University, Chongqing 400038, PR.China
| | - Bin Chen
- Division of Tumor Cell Biology, City of Hope National Medical Center and Beckman Research Institute, Duarte, CA 91010, USA
| | - Yuping Li
- Division of Tumor Cell Biology, City of Hope National Medical Center and Beckman Research Institute, Duarte, CA 91010, USA
| | - Dujin Zhou
- Division of Tumor Cell Biology, City of Hope National Medical Center and Beckman Research Institute, Duarte, CA 91010, USA
- Department of Biochemistry and Molecular Biology, Third Military Medical University, Chongqing 400038, PR.China
| | - Shiuan Chen
- Division of Tumor Cell Biology, City of Hope National Medical Center and Beckman Research Institute, Duarte, CA 91010, USA
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Bulynko YA, O'Malley BW. Nuclear receptor coactivators: structural and functional biochemistry. Biochemistry 2010; 50:313-28. [PMID: 21141906 DOI: 10.1021/bi101762x] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Transcription of eukaryotic cell is a multistep process tightly controlled by concerted action of macromolecules. Nuclear receptors are ligand-activated sequence-specific transcription factors that bind DNA and activate (or repress) transcription of specific sets of nuclear target genes. Successful activation of transcription by nuclear receptors and most other transcription factors requires "coregulators" of transcription. Coregulators make up a diverse family of proteins that physically interact with and modulate the activity of transcription factors and other components of the gene expression machinery via multiple biochemical mechanisms. The coregulators include coactivators that accomplish reactions required for activation of transcription and corepressors that suppress transcription. This review summarizes our current knowledge of nuclear receptor coactivators with an emphasis on their biochemical mechanisms of action and means of regulation.
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Affiliation(s)
- Yaroslava A Bulynko
- Molecular and Cellular Biology, BCM130 Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
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Wang Y, Zhou D, Phung S, Masri S, Smith D, Chen S. SGK3 is an estrogen-inducible kinase promoting estrogen-mediated survival of breast cancer cells. Mol Endocrinol 2010; 25:72-82. [PMID: 21084382 DOI: 10.1210/me.2010-0294] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Serum- and glucocorticoid-inducible kinase 3 (SGK3) is a protein kinase of the AGC family of protein kinase A, protein kinase G, and protein kinase C and functions downstream of phosphatidylinositol 3-kinase (PI3K). Recent study revealed that SGK3 plays a pivotal role in Akt/protein kinase B independent signaling downstream of oncogenic PI3KCA mutations in breast cancer. Here we report that SGK3 is an estrogen receptor (ER) transcriptional target and promotes estrogen-mediated cell survival of ER-positive breast cancer cells. Through a meta-analysis on 22 microarray studies of breast cancer in the Oncomine database, we found that the expression of SGK3 is significantly higher (5.7-fold, P < 0.001) in ER-positive tumors than in ER-negative tumors. In ER-positive breast cancer cells, SGK3 expression was found to be induced by 17β-estradiol (E(2)) in a dose- and time-dependent manner, and the induction of SGK3 mRNA by E(2) is independent of newly synthesized proteins. We identified two ERα-binding regions at the sgk3 locus through chromatin immunoprecipitation with massively parallel DNA sequencing. Promoter analysis revealed that ERα stimulates the activity of sgk3 promoters by interaction with these two ERα-binding regions on E(2) treatment. Loss-of-function analysis indicated that SGK3 is required for E(2)-mediated cell survival of MCF-7 breast carcinoma cells. Moreover, overexpression of SGK3 could partially protect MCF-7 cells against apoptosis caused by antiestrogen ICI 182,780. Together, our study defines the molecular mechanism of regulation of SGK3 by estrogen/ER and provides a new link between the PI3K pathway and ER signaling as well as a new estrogen-mediated cell survival mechanism mediated by SGK3 in breast cancer cells.
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Affiliation(s)
- Yuanzhong Wang
- Division of Tumor Cell Biology, Beckman Research Institute of the City of Hope, 1550 East Duarte Road, Duarte, CA 91010, USA
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