1
|
Forrester-Gauntlett B, Peters L, Oback B. Grainyhead-like 2 is required for morphological integrity of mouse embryonic stem cells and orderly formation of inner ear-like organoids. Front Cell Dev Biol 2023; 11:1112069. [PMID: 37745294 PMCID: PMC10513505 DOI: 10.3389/fcell.2023.1112069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 08/21/2023] [Indexed: 09/26/2023] Open
Abstract
Mutations in the transcription factor gene grainyhead-like 2 (GRHL2) are associated with progressive non-syndromic sensorineural deafness autosomal dominant type 28 (DFNA28) in humans. Since complete loss of Grhl2 is lethal in mouse embryos, we studied its role during inner ear pathology and hearing loss in vitro. To this end, we generated different homozygous deletions to knockout Grhl2 in mouse embryonic stem cells (Grhl2-KO ESCs), including some mimicking naturally occurring truncations in the dimerisation domain related to human DFNA28. Under naïve culture conditions, Grhl2-KO cells in suspension were more heterogenous in size and larger than wild-type controls. Adherent Grhl2-KO cells were also larger, with a less uniform shape, flattened, less circular morphology, forming loose monolayer colonies with poorly defined edges. These changes correlated with lower expression of epithelial cadherin Cdh1 but no changes in tight junction markers (Ocln, Tjp2) or other Grhl isoforms (Grhl1, Grhl3). Clonogenicity from single cells, proliferation rates of cell populations and proliferation markers were reduced in Grhl2-KO ESCs. We next induced stepwise directed differentiation of Grhl2-KO ESCs along an otic pathway, giving rise to three-dimensional inner ear-like organoids (IELOs). Quantitative morphometry revealed that Grhl2-KO cells initially formed larger IELOs with a less compacted structure, more eccentric shape and increased surface area. These morphological changes persisted for up to one week. They were partially rescued by forced cell aggregation and fully restored by stably overexpressing exogenous Grhl2 in Grhl2-KO ESCs, indicating that Grhl2 alters cell-cell interactions. On day 8, aggregates were transferred into minimal maturation medium to allow self-guided organogenesis for another two weeks. During this period, Grhl2-KO cells and wild-type controls developed similarly, expressing neural, neuronal and sensory hair cell markers, while maintaining their initial differences in size and shape. In summary, Grhl2 is required for morphological maintenance of ESCs and orderly formation of IELOs, consistent with an essential role in organising epithelial integrity during inner ear development. Our findings validate quantitative morphometry as a useful, non-invasive screening method for molecular phenotyping of candidate mutations during organoid development.
Collapse
Affiliation(s)
- Blaise Forrester-Gauntlett
- Animal Biotech, AgResearch, Hamilton, New Zealand
- School of Science, University of Waikato, Hamilton, New Zealand
| | - Linda Peters
- School of Science, University of Waikato, Hamilton, New Zealand
| | - Björn Oback
- Animal Biotech, AgResearch, Hamilton, New Zealand
- School of Science, University of Waikato, Hamilton, New Zealand
- School of Medical Sciences, University of Auckland, Auckland, New Zealand
| |
Collapse
|
2
|
Ramachandran J, Zhou W, Bardenhagen AE, Nasr T, Yates ER, Zorn AM, Ji H, Vokes SA. Hedgehog regulation of epithelial cell state and morphogenesis in the larynx. eLife 2022; 11:e77055. [PMID: 36398878 PMCID: PMC9718526 DOI: 10.7554/elife.77055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 11/18/2022] [Indexed: 11/19/2022] Open
Abstract
The larynx enables speech while regulating swallowing and respiration. Larynx function hinges on the laryngeal epithelium which originates as part of the anterior foregut and undergoes extensive remodeling to separate from the esophagus and form vocal folds that interface with the adjacent trachea. Here we find that sonic hedgehog (SHH) is essential for epithelial integrity in the mouse larynx as well as the anterior foregut. During larynx-esophageal separation, low Shh expression marks specific domains of actively remodeling epithelium that undergo an epithelial-to-mesenchymal transition (EMT) characterized by the induction of N-Cadherin and movement of cells out of the epithelial layer. Consistent with a role for SHH signaling in regulating this process, Shh mutants undergo an abnormal EMT throughout the anterior foregut and larynx, marked by a cadherin switch, movement out of the epithelial layer and cell death. Unexpectedly, Shh mutant epithelial cells are replaced by a new population of FOXA2-negative cells that likely derive from adjacent pouch tissues and form a rudimentary epithelium. These findings have important implications for interpreting the etiology of HH-dependent birth defects within the foregut. We propose that SHH signaling has a default role in maintaining epithelial identity throughout the anterior foregut and that regionalized reductions in SHH trigger epithelial remodeling.
Collapse
Affiliation(s)
- Janani Ramachandran
- Department of Molecular Biosciences, The University of Texas at AustinAustinUnited States
| | - Weiqiang Zhou
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public HealthBaltimoreUnited States
| | - Anna E Bardenhagen
- Department of Molecular Biosciences, The University of Texas at AustinAustinUnited States
| | - Talia Nasr
- Center for Stem Cell and Organoid Medicine (CuSTOM), Division of Developmental Biology, and Perinatal Institute, Cincinnati Children’s Hospital Medical CenterCincinnatiUnited States
- Department of Pediatrics, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Ellen R Yates
- Department of Molecular Biosciences, The University of Texas at AustinAustinUnited States
| | - Aaron M Zorn
- Center for Stem Cell and Organoid Medicine (CuSTOM), Division of Developmental Biology, and Perinatal Institute, Cincinnati Children’s Hospital Medical CenterCincinnatiUnited States
- Department of Pediatrics, University of Cincinnati College of MedicineCincinnatiUnited States
| | - Hongkai Ji
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public HealthBaltimoreUnited States
| | - Steven A Vokes
- Department of Molecular Biosciences, The University of Texas at AustinAustinUnited States
| |
Collapse
|
3
|
GRHL2 Enhances Phosphorylated Estrogen Receptor (ER) Chromatin Binding and Regulates ER-Mediated Transcriptional Activation and Repression. Mol Cell Biol 2022; 42:e0019122. [PMID: 36036613 PMCID: PMC9584124 DOI: 10.1128/mcb.00191-22] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Phosphorylation of estrogen receptor α (ER) at serine 118 (pS118-ER) is induced by estrogen and is the most abundant posttranslational mark associated with a transcriptionally active receptor. Cistromic analysis of pS118-ER from our group revealed enrichment of the GRHL2 motif near pS118-ER binding sites. In this study, we used cistromic and transcriptomic analyses to interrogate the relationship between GRHL2 and pS118-ER. We found that GRHL2 is bound to chromatin at pS118-ER/GRHL2 co-occupancy sites prior to ligand treatment, and GRHL2 binding is required for maximal pS118-ER recruitment. pS118-ER/GRHL2 co-occupancy sites were enriched at active enhancers marked by H3K27ac and H3K4me1, along with FOXA1 and p300, compared to sites where each factor binds independently. Transcriptomic analysis yielded four subsets of ER/GRHL2-coregulated genes revealing that GRHL2 can both enhance and antagonize E2-mediated ER transcriptional activity. Gene ontology analysis indicated that coregulated genes are involved in cell migration. Accordingly, knockdown of GRHL2, combined with estrogen treatment, resulted in increased cell migration but no change in proliferation. These results support a model in which GRHL2 binds to selected enhancers and facilitates pS118-ER recruitment to chromatin, which then results in differential activation and repression of genes that control estrogen-regulated ER-positive breast cancer cell migration.
Collapse
|
4
|
Engelhardt DM, Martyr CA, Niswander L. Pathogenesis of neural tube defects: The regulation and disruption of cellular processes underlying neural tube closure. WIREs Mech Dis 2022; 14:e1559. [PMID: 35504597 PMCID: PMC9605354 DOI: 10.1002/wsbm.1559] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 04/04/2022] [Accepted: 04/06/2022] [Indexed: 11/08/2022]
Abstract
Neural tube closure (NTC) is crucial for proper development of the brain and spinal cord and requires precise morphogenesis from a sheet of cells to an intact three-dimensional structure. NTC is dependent on successful regulation of hundreds of genes, a myriad of signaling pathways, concentration gradients, and is influenced by epigenetic and environmental cues. Failure of NTC is termed a neural tube defect (NTD) and is a leading class of congenital defects in the United States and worldwide. Though NTDs are all defined as incomplete closure of the neural tube, the pathogenesis of an NTD determines the type, severity, positioning, and accompanying phenotypes. In this review, we survey pathogenesis of NTDs relating to disruption of cellular processes arising from genetic mutations, altered epigenetic regulation, and environmental influences by micronutrients and maternal condition. This article is categorized under: Congenital Diseases > Genetics/Genomics/Epigenetics Neurological Diseases > Genetics/Genomics/Epigenetics Neurological Diseases > Stem Cells and Development.
Collapse
Affiliation(s)
- David M Engelhardt
- Molecular Cellular Developmental Biology, University of Colorado, Boulder, Colorado, USA
| | - Cara A Martyr
- Molecular Cellular Developmental Biology, University of Colorado, Boulder, Colorado, USA
| | - Lee Niswander
- Molecular Cellular Developmental Biology, University of Colorado, Boulder, Colorado, USA
| |
Collapse
|
5
|
Guan Z, Liang Y, Wang X, Zhu Z, Yang A, Li S, Yu J, Niu B, Wang J. Unraveling the Mechanisms of Clinical Drugs-Induced Neural Tube Defects Based on Network Pharmacology and Molecular Docking Analysis. Neurochem Res 2022; 47:3709-3722. [PMID: 35960485 DOI: 10.1007/s11064-022-03717-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 07/23/2022] [Accepted: 07/31/2022] [Indexed: 11/30/2022]
Abstract
Chemotherapeutic agents such as methotrexate (MTX), raltitrexed (RTX), 5-fluorouracil (5-FU), hydroxyurea (HU), and retinoic acid (RA), and valproic acid (VPA), an antiepileptic drug, all can cause malformations in the developing central nervous system (CNS), such as neural tube defects (NTDs). However, the common pathogenic mechanisms remain unclear. This study aimed to explore the mechanisms of NTDs caused by MTX, RTX, 5-FU, HU, RA, and VPA (MRFHRV), based on network pharmacology and molecular biology experiments. The MRFHRV targets were integrated with disease targets, to find the potential molecules related to MRFHRV-induced NTDs. Protein-protein interaction analysis and molecular docking were performed to analyze these common targets. Utilizing the kyoto encyclopedia of genes and genomes (KEGG) signaling pathways, we analyzed and searched the possible causative pathogenic mechanisms by crucial targets and the signaling pathway. Results showed that MRFHRV induced NTDs through several key targets (including TP53, MAPK1, HSP90AA1, ESR1, GRB2, HDAC1, EGFR, PIK3CA, RXRA, and FYN) and multiple signaling pathways such as PI3K/Akt pathway, suggesting that abnormal proliferation and differentiation could be critical pathogenic contributors in NTDs induced by MRFHRV. These results were further validated by CCK8 assay in mouse embryonic stem cells and GFAP staining in embryonic brain tissue. This study indicated that chemotherapeutic and antiepileptic agents induced NTDs might through predicted targets TP53, MAPK1, GRB2, HDAC1, EGFR, PIK3CA, RXRA, and FYN and multiple signaling pathways. More caution was required for the clinical administration for women with childbearing potential and pregnant.
Collapse
Affiliation(s)
- Zhen Guan
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Translational Medicine Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Yingchao Liang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Translational Medicine Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Xiuwei Wang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Translational Medicine Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Zhiqiang Zhu
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Translational Medicine Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Aiyun Yang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Translational Medicine Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Shen Li
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Translational Medicine Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Jialu Yu
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Translational Medicine Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Bo Niu
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Translational Medicine Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China.
| | - Jianhua Wang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Translational Medicine Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China.
| |
Collapse
|
6
|
Gasperoni JG, Fuller JN, Darido C, Wilanowski T, Dworkin S. Grainyhead-like (Grhl) Target Genes in Development and Cancer. Int J Mol Sci 2022; 23:ijms23052735. [PMID: 35269877 PMCID: PMC8911041 DOI: 10.3390/ijms23052735] [Citation(s) in RCA: 4] [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: 01/25/2022] [Revised: 02/25/2022] [Accepted: 02/26/2022] [Indexed: 12/12/2022] Open
Abstract
Grainyhead-like (GRHL) factors are essential, highly conserved transcription factors (TFs) that regulate processes common to both natural cellular behaviours during embryogenesis, and de-regulation of growth and survival pathways in cancer. Serving to drive the transcription, and therefore activation of multiple co-ordinating pathways, the three GRHL family members (GRHL1-3) are a critical conduit for modulating the molecular landscape that guides cellular decision-making processes during proliferation, epithelial-mesenchymal transition (EMT) and migration. Animal models and in vitro approaches harbouring GRHL loss or gain-of-function are key research tools to understanding gene function, which gives confidence that resultant phenotypes and cellular behaviours may be translatable to humans. Critically, identifying and characterising the target genes to which these factors bind is also essential, as they allow us to discover and understand novel genetic pathways that could ultimately be used as targets for disease diagnosis, drug discovery and therapeutic strategies. GRHL1-3 and their transcriptional targets have been shown to drive comparable cellular processes in Drosophila, C. elegans, zebrafish and mice, and have recently also been implicated in the aetiology and/or progression of a number of human congenital disorders and cancers of epithelial origin. In this review, we will summarise the state of knowledge pertaining to the role of the GRHL family target genes in both development and cancer, primarily through understanding the genetic pathways transcriptionally regulated by these factors across disparate disease contexts.
Collapse
Affiliation(s)
- Jemma G. Gasperoni
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, VIC 3086, Australia; (J.G.G.); (J.N.F.)
| | - Jarrad N. Fuller
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, VIC 3086, Australia; (J.G.G.); (J.N.F.)
| | - Charbel Darido
- The Peter MacCallum Cancer Centre, 305 Grattan St, Melbourne, VIC 3000, Australia;
- Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Tomasz Wilanowski
- Institute of Genetics and Biotechnology, Faculty of Biology, University of Warsaw, 02-096 Warsaw, Poland;
| | - Sebastian Dworkin
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, VIC 3086, Australia; (J.G.G.); (J.N.F.)
- Correspondence:
| |
Collapse
|
7
|
Tian T, Lai X, Xiang K, Han X, Yin S, Cabrera RM, Steele JW, Lei Y, Cao X, Finnell RH, Wang L, Ren A. Hypermethylation of PI3K-AKT signalling pathway genes is associated with human neural tube defects. Epigenetics 2022; 17:133-146. [PMID: 33491544 PMCID: PMC8865305 DOI: 10.1080/15592294.2021.1878725] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 12/25/2020] [Accepted: 01/07/2021] [Indexed: 10/22/2022] Open
Abstract
Neural tube defects (NTDs) are a group of common and severe congenital malformations. The PI3K-AKT signalling pathway plays a crucial role in the neural tube development. There is limited evidence concerning any possible association between aberrant methylation in PI3K-AKT signalling pathway genes and NTDs. Therefore, we aimed to investigate potential associations between aberrant methylation of PI3K-AKT pathway genes and NTDs. Methylation studies of PI3K-AKT pathway genes utilizing microarray genome-methylation data derived from neural tissues of ten NTD cases and eight non-malformed controls were performed. Targeted DNA methylation analysis was subsequently performed in an independent cohort of 73 NTD cases and 32 controls to validate the methylation levels of identified genes. siRNAs were used to pull-down the target genes in human embryonic stem cells (hESCs) to examine the effects of the aberrant expression of target genes on neural cells. As a result, 321 differentially hypermethylated CpG sites in the promoter regions of 30 PI3K-AKT pathway genes were identified in the microarray data. In target methylation analysis, CHRM1, FGF19, and ITGA7 were confirmed to be significantly hypermethylated in NTD cases and were associated with increased risk for NTDs. The down-regulation of FGF19, CHRM1, and ITGA7 impaired the formation of rosette-like cell aggregates. The down-regulation of those three genes affected the expression of PAX6, SOX2 and MAP2, implying their influence on the differentiation of neural cells. This study for the first time reported that hypermethylation of PI3K-AKT pathway genes such as CHRM1, FGF19, and ITGA7 is associated with human NTDs.
Collapse
Affiliation(s)
- Tian Tian
- Institute of Reproductive and Child Health, National Health Commission Key Laboratory of Reproductive Health, Peking University, Beijing, China
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing, China
| | - Xinyuan Lai
- Department of Microbiology and Infectious Disease Center, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Kuanhui Xiang
- Department of Microbiology and Infectious Disease Center, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Xiao Han
- Center for Precision Environmental Health, Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - Shengju Yin
- Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Robert M. Cabrera
- Center for Precision Environmental Health, Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - John W. Steele
- Center for Precision Environmental Health, Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - Yunping Lei
- Center for Precision Environmental Health, Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - Xuanye Cao
- Center for Precision Environmental Health, Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - Richard H. Finnell
- Center for Precision Environmental Health, Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
- Departments of Molecular and Human Genetics and Medicine, Baylor College of Medicine, Houston, TX, USA
| | - Linlin Wang
- Institute of Reproductive and Child Health, National Health Commission Key Laboratory of Reproductive Health, Peking University, Beijing, China
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing, China
| | - Aiguo Ren
- Institute of Reproductive and Child Health, National Health Commission Key Laboratory of Reproductive Health, Peking University, Beijing, China
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing, China
| |
Collapse
|
8
|
Johnson KS, Hussein S, Chakraborty P, Muruganantham A, Mikhail S, Gonzalez G, Song S, Jolly MK, Toneff MJ, Benton ML, Lin YC, Taube JH. CTCF Expression and Dynamic Motif Accessibility Modulates Epithelial-Mesenchymal Gene Expression. Cancers (Basel) 2022; 14:cancers14010209. [PMID: 35008373 PMCID: PMC8750563 DOI: 10.3390/cancers14010209] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 12/14/2022] Open
Abstract
Epithelial-mesenchymal transition (EMT) and its reversal, mesenchymal-epithelial transition (MET) drive tissue reorganization critical for early development. In carcinomas, processing through EMT, MET, or partial states promotes migration, invasion, dormancy, and metastatic colonization. As a reversible process, EMT is inherently regulated at epigenetic and epigenomic levels. To understand the epigenomic nature of reversible EMT and its partial states, we characterized chromatin accessibility dynamics, transcriptomic output, protein expression, and cellular phenotypes during stepwise reversible EMT. We find that the chromatin insulating protein machinery, including CTCF, is suppressed and re-expressed, coincident with broad alterations in chromatin accessibility, during EMT/MET, and is lower in triple-negative breast cancer cell lines with EMT features. Through an analysis of chromatin accessibility using ATAC-seq, we identify that early phases of EMT are characterized by enrichment for AP-1 family member binding motifs, but also by a diminished enrichment for CTCF binding motifs. Through a loss-of-function analysis, we demonstrate that the suppression of CTCF alters cellular plasticity, strengthening the epithelial phenotype via the upregulation of epithelial markers E-cadherin/CDH1 and downregulation of N-cadherin/CDH2. Conversely, the upregulation of CTCF leads to the upregulation of EMT gene expression and an increase in mesenchymal traits. These findings are indicative of a role of CTCF in regulating epithelial-mesenchymal plasticity and gene expression.
Collapse
Affiliation(s)
- Kelsey S. Johnson
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Shaimaa Hussein
- Baylor Institute for Immunology Research, Baylor Scott & White, Dallas, TX 75246, USA; (S.H.); (Y.C.L.)
| | - Priyanka Chakraborty
- Centre for BioSystems Science and Engineering, Indian Institute of Science, Bangalore 560012, India; (P.C.); (M.K.J.)
| | - Arvind Muruganantham
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Sheridan Mikhail
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Giovanny Gonzalez
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Shuxuan Song
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
| | - Mohit Kumar Jolly
- Centre for BioSystems Science and Engineering, Indian Institute of Science, Bangalore 560012, India; (P.C.); (M.K.J.)
| | | | | | - Yin C. Lin
- Baylor Institute for Immunology Research, Baylor Scott & White, Dallas, TX 75246, USA; (S.H.); (Y.C.L.)
| | - Joseph H. Taube
- Department of Biology, Baylor University, Waco, TX 76706, USA; (K.S.J.); (A.M.); (S.M.); (G.G.); (S.S.)
- Dan L. Duncan Cancer Center, Houston, TX 76706, USA
- Correspondence:
| |
Collapse
|
9
|
Jaffe E, Niswander L. Loss of Grhl3 is correlated with altered cellular protrusions in the non-neural ectoderm during neural tube closure. Dev Dyn 2021; 250:732-744. [PMID: 33378081 DOI: 10.1002/dvdy.292] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 12/21/2020] [Accepted: 12/21/2020] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The transcription factor Grainyhead-like 3 (GRHL3) has multiple roles in a variety of tissues during development including epithelial patterning and actin cytoskeletal regulation. During neural tube closure (NTC) in the mouse embryo, GRHL3 is expressed and functions in the non-neural ectoderm (NNE). Two important functions of GRHL3 are regulating the actin cytoskeleton during NTC and regulating the boundary between the NNE and neural ectoderm. However, an open question that remains is whether these functions explain the caudally restricted neural tube defect (NTD) of spina bifida observed in Grhl3 mutants. RESULTS Using scanning electron microscopy and immunofluorescence based imaging on Grhl3 mutants and wildtype controls, we show that GRHL3 is dispensable for NNE identity or epithelial maintenance in the caudal NNE but is needed for regulation of cellular protrusions during NTC. Grhl3 mutants have decreased lamellipodia relative to wildtype embryos during caudal NTC, first observed at the onset of delays when lamellipodia become prominent in wildtype embryos. At the axial level of NTD, half of the mutants show increased and disorganized filopodia and half lack cellular protrusions. CONCLUSION These data suggest that altered cellular protrusions during NTC contribute to the etiology of NTD in Grhl3 mutants.
Collapse
Affiliation(s)
- Eric Jaffe
- Molecular Biology Graduate Program, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, Colorado, USA
| | - Lee Niswander
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, Colorado, USA
| |
Collapse
|
10
|
Deng Z, Cangkrama M, Butt T, Jane SM, Carpinelli MR. Grainyhead-like transcription factors: guardians of the skin barrier. Vet Dermatol 2021; 32:553-e152. [PMID: 33843098 DOI: 10.1111/vde.12956] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 11/24/2020] [Accepted: 12/14/2020] [Indexed: 01/02/2023]
Abstract
There has been selective pressure to maintain a skin barrier since terrestrial animals evolved 360 million years ago. These animals acquired an unique integumentary system with a keratinized, stratified, squamous epithelium surface barrier. The barrier protects against dehydration and entry of microbes and toxins. The skin barrier centres on the stratum corneum layer of the epidermis and consists of cornified envelopes cemented by the intercorneocyte lipid matrix. Multiple components of the barrier undergo cross-linking by transglutaminase (TGM) enzymes, while keratins provide additional mechanical strength. Cellular tight junctions also are crucial for barrier integrity. The grainyhead-like (GRHL) transcription factors regulate the formation and maintenance of the integument in diverse species. GRHL3 is essential for formation of the skin barrier during embryonic development, whereas GRHL1 maintains the skin barrier postnatally. This is achieved by transactivation of Tgm1 and Tgm5, respectively. In addition to its barrier function, GRHL3 plays key roles in wound repair and as an epidermal tumour suppressor. In its former role, GRHL3 activates the planar cell polarity signalling pathway to mediate wound healing by providing directional migration cues. In squamous epithelium, GRHL3 regulates the balance between proliferation and differentiation, and its loss induces squamous cell carcinoma (SCC). In the skin, this is mediated through increased expression of MIR21, which reduces the expression levels of GRHL3 and its direct target, PTEN, leading to activation of the PI3K-AKT signalling pathway. These data position the GRHL family as master regulators of epidermal homeostasis across a vast gulf of evolutionary history.
Collapse
Affiliation(s)
- Zihao Deng
- Department of Medicine, Central Clinical School, Monash University, Melbourne, Australia
| | - Michael Cangkrama
- Department of Biology, Institute of Molecular Health Sciences, ETH Zurich, Zurich, Switzerland
| | - Tariq Butt
- Department of Medicine, Central Clinical School, Monash University, Melbourne, Australia
| | - Stephen M Jane
- Department of Medicine, Central Clinical School, Monash University, Melbourne, Australia
| | - Marina R Carpinelli
- Department of Medicine, Central Clinical School, Monash University, Melbourne, Australia
| |
Collapse
|
11
|
Au KS, Hebert L, Hillman P, Baker C, Brown MR, Kim DK, Soldano K, Garrett M, Ashley-Koch A, Lee S, Gleeson J, Hixson JE, Morrison AC, Northrup H. Human myelomeningocele risk and ultra-rare deleterious variants in genes associated with cilium, WNT-signaling, ECM, cytoskeleton and cell migration. Sci Rep 2021; 11:3639. [PMID: 33574475 PMCID: PMC7878900 DOI: 10.1038/s41598-021-83058-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 01/28/2021] [Indexed: 01/08/2023] Open
Abstract
Myelomeningocele (MMC) affects one in 1000 newborns annually worldwide and each surviving child faces tremendous lifetime medical and caregiving burdens. Both genetic and environmental factors contribute to disease risk but the mechanism is unclear. This study examined 506 MMC subjects for ultra-rare deleterious variants (URDVs, absent in gnomAD v2.1.1 controls that have Combined Annotation Dependent Depletion score ≥ 20) in candidate genes either known to cause abnormal neural tube closure in animals or previously associated with human MMC in the current study cohort. Approximately 70% of the study subjects carried one to nine URDVs among 302 candidate genes. Half of the study subjects carried heterozygous URDVs in multiple genes involved in the structure and/or function of cilium, cytoskeleton, extracellular matrix, WNT signaling, and/or cell migration. Another 20% of the study subjects carried heterozygous URDVs in candidate genes associated with gene transcription regulation, folate metabolism, or glucose metabolism. Presence of URDVs in the candidate genes involving these biological function groups may elevate the risk of developing myelomeningocele in the study cohort.
Collapse
Affiliation(s)
- K S Au
- Division of Medical Genetics, Department of Pediatrics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, 77030, USA.
| | - L Hebert
- Division of Medical Genetics, Department of Pediatrics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, 77030, USA
| | - P Hillman
- Division of Medical Genetics, Department of Pediatrics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, 77030, USA
| | - C Baker
- Division of Medical Genetics, Department of Pediatrics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, 77030, USA.,Munroe-Meyer Institute, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - M R Brown
- Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, University of Texas Health Science Center At Houston, Houston, TX, 77030, USA
| | - D-K Kim
- Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, University of Texas Health Science Center At Houston, Houston, TX, 77030, USA
| | - K Soldano
- Department of Medicine, Duke University Medical Center, Durham, NC, 27701, USA
| | - M Garrett
- Department of Medicine, Duke University Medical Center, Durham, NC, 27701, USA
| | - A Ashley-Koch
- Department of Medicine, Duke University Medical Center, Durham, NC, 27701, USA
| | - S Lee
- Department of Neurosciences and Pediatrics, University of California-San Diego, La Jolla, CA, 92093, USA.,Rady Children's Institute for Genomic Medicine, San Diego, CA, 92025, USA
| | - J Gleeson
- Department of Neurosciences and Pediatrics, University of California-San Diego, La Jolla, CA, 92093, USA.,Rady Children's Institute for Genomic Medicine, San Diego, CA, 92025, USA
| | - J E Hixson
- Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, University of Texas Health Science Center At Houston, Houston, TX, 77030, USA
| | - A C Morrison
- Department of Epidemiology, Human Genetics and Environmental Sciences, School of Public Health, University of Texas Health Science Center At Houston, Houston, TX, 77030, USA
| | - H Northrup
- Division of Medical Genetics, Department of Pediatrics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, 77030, USA
| |
Collapse
|
12
|
Shen J, Wu J, Yang Y, Wang P, Luo T, Guo Y, Zhao J, Dai W, Han Y, Zhu P, Wu Q, Li W, Chen A, Xue C, Xia X. The paradoxical problem with COVID-19 ocular infection: Moderate clinical manifestation and potential infection risk. Comput Struct Biotechnol J 2021; 19:1063-1071. [PMID: 33613871 PMCID: PMC7881169 DOI: 10.1016/j.csbj.2021.01.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 01/19/2021] [Accepted: 01/23/2021] [Indexed: 01/08/2023] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which induced mainly the respiratory damage also caused ocular surface symptoms. However, the detailed description of ocular manifestations, severity fluctuations in confirmed COVID-19 adult patients still lacked. We analyzed onset clinical symptoms and duration, ocular symptoms, needs for medication, outcomes in 28 conjunctivitis patients who were extracted from 3198 COVID-19 patients hospitalized in Huoshenshan Hospital and Taikangtongji Hospital, Wuhan, China. The expression levels of ACE2, TMPRSS2, ANPEP, DPP4, NRP1 on fetal and adult ocular surface and mouse lacrimal glands were assessed by single cell seq analysis. Our results indicated that conjunctivitis was a rare and self-limited complication in adults with COVID-19 while the existence of coronavirus receptors on human ocular surface and mouse lacrimal glands indicated the risk of SARS-CoV-2 infection. Our research firstly examined SARS-CoV-2 receptors, including the new discovered one, NRP1, on the fetal ocular surface and in the mouse lacrimal glands.
Collapse
Affiliation(s)
- Jiawei Shen
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
- Department of Ophthalmology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, Jiangsu 210002, China
| | - Jian Wu
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Yang Yang
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Pengcheng Wang
- Department of Clinical Laboratory, The 901th Hospital of the Joint Logistics Support Force of PLA, Hefei, Anhui 230031, China
- Department of Clinical Laboratory, Taikang Tongji Hospital, Wuhan, Hubei 430050, China
| | - Tao Luo
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Yanju Guo
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Jun Zhao
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Wei Dai
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Ying Han
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Peiran Zhu
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Qiuyue Wu
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Weiwei Li
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
| | - Andrew Chen
- Jericho High School, 99 Cedar Swamp Rd, Jericho, NY 11753, USA
| | - Chunyan Xue
- Department of Ophthalmology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, Jiangsu 210002, China
- Corresponding authors at: Department of Ophthalmology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, Jiangsu 210002, China (C. Xue). COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China (X. Xia).
| | - Xinyi Xia
- COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China
- Joint Expert Group for COVID-19, Department of Laboratory Medicine, Wuhan Huoshenshan Hospital, Wuhan, Hubei 430100, China
- Corresponding authors at: Department of Ophthalmology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, Jiangsu 210002, China (C. Xue). COVID-19 Research Center, Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing Clinical College of Southern Medical University, Nanjing, Jiangsu 210002, China (X. Xia).
| |
Collapse
|
13
|
Brooks ER, Islam MT, Anderson KV, Zallen JA. Sonic hedgehog signaling directs patterned cell remodeling during cranial neural tube closure. eLife 2020; 9:60234. [PMID: 33103996 PMCID: PMC7655103 DOI: 10.7554/elife.60234] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 10/25/2020] [Indexed: 12/13/2022] Open
Abstract
Neural tube closure defects are a major cause of infant mortality, with exencephaly accounting for nearly one-third of cases. However, the mechanisms of cranial neural tube closure are not well understood. Here, we show that this process involves a tissue-wide pattern of apical constriction controlled by Sonic hedgehog (Shh) signaling. Midline cells in the mouse midbrain neuroepithelium are flat with large apical surfaces, whereas lateral cells are taller and undergo synchronous apical constriction, driving neural fold elevation. Embryos lacking the Shh effector Gli2 fail to produce appropriate midline cell architecture, whereas embryos with expanded Shh signaling, including the IFT-A complex mutants Ift122 and Ttc21b and embryos expressing activated Smoothened, display apical constriction defects in lateral cells. Disruption of lateral, but not midline, cell remodeling results in exencephaly. These results reveal a morphogenetic program of patterned apical constriction governed by Shh signaling that generates structural changes in the developing mammalian brain.
Collapse
Affiliation(s)
- Eric R Brooks
- Howard Hughes Medical Institute and Developmental Biology Program, Sloan Kettering Institute, New York, United States
| | - Mohammed Tarek Islam
- Howard Hughes Medical Institute and Developmental Biology Program, Sloan Kettering Institute, New York, United States
| | - Kathryn V Anderson
- Developmental Biology Program, Sloan Kettering Institute, New York, United States
| | - Jennifer A Zallen
- Howard Hughes Medical Institute and Developmental Biology Program, Sloan Kettering Institute, New York, United States
| |
Collapse
|
14
|
Sundararajan V, Pang QY, Choolani M, Huang RYJ. Spotlight on the Granules (Grainyhead-Like Proteins) - From an Evolutionary Conserved Controller of Epithelial Trait to Pioneering the Chromatin Landscape. Front Mol Biosci 2020; 7:213. [PMID: 32974388 PMCID: PMC7471608 DOI: 10.3389/fmolb.2020.00213] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Accepted: 08/03/2020] [Indexed: 12/12/2022] Open
Abstract
Among the transcription factors that are conserved across phylogeny, the grainyhead family holds vital roles in driving the epithelial cell fate. In Drosophila, the function of grainyhead (grh) gene is essential during developmental processes such as epithelial differentiation, tracheal tube formation, maintenance of wing and hair polarity, and epidermal barrier wound repair. Three main mammalian orthologs of grh: Grainyhead-like 1-3 (GRHL1, GRHL2, and GRHL3) are highly conserved in terms of their gene structures and functions. GRHL proteins are essentially associated with the development and maintenance of the epithelial phenotype across diverse physiological conditions such as epidermal differentiation and craniofacial development as well as pathological functions including hearing impairment and neural tube defects. More importantly, through direct chromatin binding and induction of epigenetic alterations, GRHL factors function as potent suppressors of oncogenic cellular dedifferentiation program - epithelial-mesenchymal transition and its associated tumor-promoting phenotypes such as tumor cell migration and invasion. On the contrary, GRHL factors also induce pro-tumorigenic effects such as increased migration and anchorage-independent growth in certain tumor types. Furthermore, investigations focusing on the epithelial-specific activation of grh and GRHL factors have revealed that these factors potentially act as a pioneer factor in establishing a cell-type/cell-state specific accessible chromatin landscape that is exclusive for epithelial gene transcription. In this review, we highlight the essential roles of grh and GRHL factors during embryogenesis and pathogenesis, with a special focus on its emerging pioneering function.
Collapse
Affiliation(s)
- Vignesh Sundararajan
- Center for Translational Medicine, Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Qing You Pang
- Center for Translational Medicine, Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
- Department of Obstetrics and Gynaecology, National University of Singapore, Singapore, Singapore
| | - Mahesh Choolani
- Department of Obstetrics and Gynaecology, National University of Singapore, Singapore, Singapore
| | - Ruby Yun-Ju Huang
- Department of Obstetrics and Gynaecology, National University of Singapore, Singapore, Singapore
- School of Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
- Graduate Institute of Oncology, College of Medicine, National Taiwan University, Taipei, Taiwan
| |
Collapse
|
15
|
Abstract
During embryonic development, the central nervous system forms as the neural plate and then rolls into a tube in a complex morphogenetic process known as neurulation. Neural tube defects (NTDs) occur when neurulation fails and are among the most common structural birth defects in humans. The frequency of NTDs varies greatly anywhere from 0.5 to 10 in 1000 live births, depending on the genetic background of the population, as well as a variety of environmental factors. The prognosis varies depending on the size and placement of the lesion and ranges from death to severe or moderate disability, and some NTDs are asymptomatic. This chapter reviews how mouse models have contributed to the elucidation of the genetic, molecular, and cellular basis of neural tube closure, as well as to our understanding of the causes and prevention of this devastating birth defect.
Collapse
Affiliation(s)
- Irene E Zohn
- Center for Genetic Medicine, Children's Research Institute, Children's National Medical Center, Washington, DC, USA.
| |
Collapse
|
16
|
Carpinelli MR, de Vries ME, Auden A, Butt T, Deng Z, Partridge DD, Miles LB, Georgy SR, Haigh JJ, Darido C, Brabletz S, Brabletz T, Stemmler MP, Dworkin S, Jane SM. Inactivation of Zeb1 in GRHL2-deficient mouse embryos rescues mid-gestation viability and secondary palate closure. Dis Model Mech 2020; 13:dmm.042218. [PMID: 32005677 PMCID: PMC7104862 DOI: 10.1242/dmm.042218] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 01/13/2020] [Indexed: 12/12/2022] Open
Abstract
Cleft lip and palate are common birth defects resulting from failure of the facial processes to fuse during development. The mammalian grainyhead-like (Grhl1-3) genes play key roles in a number of tissue fusion processes including neurulation, epidermal wound healing and eyelid fusion. One family member, Grhl2, is expressed in the epithelial lining of the first pharyngeal arch in mice at embryonic day (E)10.5, prompting analysis of the role of this factor in palatogenesis. Grhl2-null mice die at E11.5 with neural tube defects and a cleft face phenotype, precluding analysis of palatal fusion at a later stage of development. However, in the first pharyngeal arch of Grhl2-null embryos, dysregulation of transcription factors that drive epithelial-mesenchymal transition (EMT) occurs. The aberrant expression of these genes is associated with a shift in RNA-splicing patterns that favours the generation of mesenchymal isoforms of numerous regulators. Driving the EMT perturbation is loss of expression of the EMT-suppressing transcription factors Ovol1 and Ovol2, which are direct GRHL2 targets. The expression of the miR-200 family of microRNAs, also GRHL2 targets, is similarly reduced, resulting in a 56-fold upregulation of Zeb1 expression, a major driver of mesenchymal cellular identity. The critical role of GRHL2 in mediating cleft palate in Zeb1−/− mice is evident, with rescue of both palatal and facial fusion seen in Grhl2−/−;Zeb1−/− embryos. These findings highlight the delicate balance between GRHL2/ZEB1 and epithelial/mesenchymal cellular identity that is essential for normal closure of the palate and face. Perturbation of this pathway may underlie cleft palate in some patients. Summary: Epithelial transcription factor GRHL2 is required for face closure while mesenchymal transcription factor ZEB1 is required for palate closure. Surprisingly, animals lacking both factors close their face and secondary palate.
Collapse
Affiliation(s)
- Marina R Carpinelli
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Michael E de Vries
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Alana Auden
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Tariq Butt
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Zihao Deng
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Darren D Partridge
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Lee B Miles
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Smitha R Georgy
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Jody J Haigh
- Australian Centre for Blood Diseases, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Charbel Darido
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Simone Brabletz
- Department of Experimental Medicine I, Nikolaus-Fiebiger Center for Molecular Medicine, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen 91054, Germany
| | - Thomas Brabletz
- Department of Experimental Medicine I, Nikolaus-Fiebiger Center for Molecular Medicine, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen 91054, Germany
| | - Marc P Stemmler
- Department of Experimental Medicine I, Nikolaus-Fiebiger Center for Molecular Medicine, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen 91054, Germany
| | - Sebastian Dworkin
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| | - Stephen M Jane
- Department of Medicine, Central Clinical School, Monash University, 99 Commercial Road, Melbourne, VIC 3004, Australia
| |
Collapse
|
17
|
de Vries M, Carpinelli M, Rutland E, Hatzipantelis A, Partridge D, Auden A, Anderson PJ, De Groef B, Wu H, Osterwalder M, Visel A, Jane SM, Dworkin S. Interrogating the Grainyhead-like 2 (Grhl2) genomic locus identifies an enhancer element that regulates palatogenesis in mouse. Dev Biol 2020; 459:194-203. [PMID: 31782997 DOI: 10.1016/j.ydbio.2019.11.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 11/22/2019] [Accepted: 11/26/2019] [Indexed: 10/25/2022]
Abstract
The highly-conserved Grainyhead-like (Grhl) transcription factors are critical regulators of embryogenesis that regulate cellular survival, proliferation, migration and epithelial integrity, especially during the formation of the craniofacial skeleton. Family member Grhl2 is expressed throughout epithelial tissues during development, and loss of Grhl2 function leads to significant defects in neurulation, abdominal wall closure, formation of the face and fusion of the maxilla/palate. Whereas numerous downstream target genes of Grhl2 have been identified, very little is known about how this crucial developmental transcription factor itself is regulated. Here, using in silico and in utero expression analyses and functional deletion in mice, we have identified a novel 2.4 kb enhancer element (mm1286) that drives reporter gene expression in a pattern that strongly recapitulates endogenous Grhl2 in the craniofacial primordia, modulates Grhl2 expression in these tissues, and augments Grhl2-mediated closure of the secondary palate. Deletion of this genomic element, in the context of inactivation of one allele of Grhl2 (through generation of double heterozygous Grhl2+/-;mm1286+/- mice), results in a significant predisposition to palatal clefting at birth. Moreover, we found that a highly conserved 325 bp region of mm1286 is both necessary and sufficient for mediating the craniofacial-specific enhancer activity of this region, and that an extremely well-conserved 12-bp sequence within this element (CTGTCAAACAGGT) substantially determines full enhancer function. Together, these data provide valuable new insights into the upstream genomic regulatory landscape responsible for transcriptional control of Grhl2 during palatal closure.
Collapse
Affiliation(s)
- Michael de Vries
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3004, Australia; Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, Victoria, 3086, Australia
| | - Marina Carpinelli
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3004, Australia
| | - Emilie Rutland
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3004, Australia
| | - Aaron Hatzipantelis
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3004, Australia
| | - Darren Partridge
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3004, Australia
| | - Alana Auden
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3004, Australia
| | - Peter J Anderson
- Australian Craniofacial Unit, Women and Children's Hospital, Adelaide, SA, 5005, Australia; Faculty of Health Sciences, University of Adelaide, SA, 5005, Australia; Nanjing Medical University, Nanjing, PR China
| | - Bert De Groef
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, Victoria, 3086, Australia
| | - Han Wu
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Marco Osterwalder
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Axel Visel
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA; U.S. Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA; School of Natural Sciences, University of California, Merced, CA, 95343, USA
| | - Stephen M Jane
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3004, Australia
| | - Sebastian Dworkin
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, Victoria, 3086, Australia.
| |
Collapse
|
18
|
He J, Feng C, Zhu H, Wu S, Jin P, Xu T. Grainyhead-like 2 as a double-edged sword in development and cancer. Am J Transl Res 2020; 12:310-331. [PMID: 32194886 PMCID: PMC7061838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 01/04/2020] [Indexed: 06/10/2023]
Abstract
Grainyhead-like 2 (GRHL2), one of the three homologs of Drosophila grainyhead, contributes to epithelial morphogenesis and differentiation. Dysregulation of GRHL2 has been shown to be involved in hearing loss and neural tube defects during embryogenesis. Moreover, it is well-recognized that GRHL2 suppresses epithelial-to-mesenchymal transition (EMT) that is required for migration and invasion of carcinoma, implicating, GRHL2 in carcinogenesis. Diverse mechanisms, as well as the varied roles of GRHL2 in different tumor tissues, have been elucidated. However, the functions of GRHL2 appear to be more complicated than initially thought. GRHL2, acting as either a tumor enhancer or a tumor inhibitor, depends on the type of cancer. In this review, we summarize research progress about normal physiological functions of GRHL2 including epithelial morphogenesis, neural tube closure, and hearing loss. Moreover, the mechanisms of GRHL2 in tumorigenesis, containing EMT suppression, forming a negative feedback loop with ZEB1 and miR200 family, interactions with estrogen receptor (ER)-dependent signaling pathway, regulation of telomerase reverse transcriptase and relationships with TGF-beta signaling pathway are discussed in this review in an effort to better understand the roles of GRHL2 in a variety of cancers toward the goal of GRHL2-targeted treatment in the near future.
Collapse
Affiliation(s)
- Jiaxing He
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin UniversityChangchun, Jilin, China
| | - Chunyang Feng
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin UniversityChangchun, Jilin, China
| | - He Zhu
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin UniversityChangchun, Jilin, China
| | - Shuying Wu
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin UniversityChangchun, Jilin, China
| | - Peng Jin
- Department of Human Genetics, Emory University School of MedicineAtlanta, GA 30322, USA
| | - Tianmin Xu
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin UniversityChangchun, Jilin, China
| |
Collapse
|
19
|
Francou A, Anderson KV. The Epithelial-to-Mesenchymal Transition (EMT) in Development and Cancer. ANNUAL REVIEW OF CANCER BIOLOGY-SERIES 2019; 4:197-220. [PMID: 34113749 DOI: 10.1146/annurev-cancerbio-030518-055425] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Epithelial-to-mesenchymal transitions (EMTs) are complex cellular processes where cells undergo dramatic changes in signaling, transcriptional programming, and cell shape, while directing the exit of cells from the epithelium and promoting migratory properties of the resulting mesenchyme. EMTs are essential for morphogenesis during development and are also a critical step in cancer progression and metastasis formation. Here we provide an overview of the molecular regulation of the EMT process during embryo development, focusing on chick and mouse gastrulation and neural crest development. We go on to describe how EMT regulators participate in the progression of pancreatic and breast cancer in mouse models, and discuss the parallels with developmental EMTs and how these help to understand cancer EMTs. We also highlight the differences between EMTs in tumor and in development to arrive at a broader view of cancer EMT. We conclude by discussing how further advances in the field will rely on in vivo dynamic imaging of the cellular events of EMT.
Collapse
Affiliation(s)
- Alexandre Francou
- Developmental Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York NY 10065 USA
| | - Kathryn V Anderson
- Developmental Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York NY 10065 USA
| |
Collapse
|
20
|
Meta-Analysis of Grainyhead-Like Dependent Transcriptional Networks: A Roadmap for Identifying Novel Conserved Genetic Pathways. Genes (Basel) 2019; 10:genes10110876. [PMID: 31683705 PMCID: PMC6896185 DOI: 10.3390/genes10110876] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 10/25/2019] [Accepted: 10/28/2019] [Indexed: 12/17/2022] Open
Abstract
The Drosophila grainyhead (grh) and vertebrate Grainyhead-like (Grhl) transcription factors are among the most critical genes for epithelial development, maintenance and homeostasis, and are remarkably well conserved from fungi to humans. Mutations affecting grh/Grhl function lead to a myriad of developmental and adult onset epithelial disease, such as aberrant skin barrier formation, facial/palatal clefting, impaired neural tube closure, age-related hearing loss, ectodermal dysplasia, and importantly, cancers of epithelial origin. Recently, mutations in the family member GRHL3 have been shown to lead to both syndromic and non-syndromic facial and palatal clefting in humans, particularly the genetic disorder Van Der Woude Syndrome (VWS), as well as spina bifida, whereas mutations in mammalian Grhl2 lead to exencephaly and facial clefting. As transcription factors, Grhl proteins bind to and activate (or repress) a substantial number of target genes that regulate and drive a cascade of transcriptional networks. A multitude of large-scale datasets have been generated to explore the grh/Grhl-dependent transcriptome, following ablation or mis-regulation of grh/Grhl-function. Here, we have performed a meta-analysis of all 41 currently published grh and Grhl RNA-SEQ, and microarray datasets, in order to identify and characterise the transcriptional networks controlled by grh/Grhl genes across disparate biological contexts. Moreover, we have also cross-referenced our results with published ChIP and ChIP-SEQ datasets, in order to determine which of the critical effector genes are likely to be direct grh/Grhl targets, based on genomic occupancy by grh/Grhl genes. Lastly, to interrogate the predictive strength of our approach, we experimentally validated the expression of the top 10 candidate grhl target genes in epithelial development, in a zebrafish model lacking grhl3, and found that orthologues of seven of these (cldn23, ppl, prom2, ocln, slc6a19, aldh1a3, and sod3) were significantly down-regulated at 48 hours post-fertilisation. Therefore, our study provides a strong predictive resource for the identification of putative grh/grhl effector target genes.
Collapse
|
21
|
Hockman D, Chong-Morrison V, Green SA, Gavriouchkina D, Candido-Ferreira I, Ling ITC, Williams RM, Amemiya CT, Smith JJ, Bronner ME, Sauka-Spengler T. A genome-wide assessment of the ancestral neural crest gene regulatory network. Nat Commun 2019; 10:4689. [PMID: 31619682 PMCID: PMC6795873 DOI: 10.1038/s41467-019-12687-4] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Accepted: 09/23/2019] [Indexed: 12/17/2022] Open
Abstract
The neural crest (NC) is an embryonic cell population that contributes to key vertebrate-specific features including the craniofacial skeleton and peripheral nervous system. Here we examine the transcriptional and epigenomic profiles of NC cells in the sea lamprey, in order to gain insight into the ancestral state of the NC gene regulatory network (GRN). Transcriptome analyses identify clusters of co-regulated genes during NC specification and migration that show high conservation across vertebrates but also identify transcription factors (TFs) and cell-adhesion molecules not previously implicated in NC migration. ATAC-seq analysis uncovers an ensemble of cis-regulatory elements, including enhancers of Tfap2B, SoxE1 and Hox-α2 validated in the embryo. Cross-species deployment of lamprey elements identifies the deep conservation of lamprey SoxE1 enhancer activity, mediating homologous expression in jawed vertebrates. Our data provide insight into the core GRN elements conserved to the base of the vertebrates and expose others that are unique to lampreys.
Collapse
Affiliation(s)
- Dorit Hockman
- Radcliffe Department of Medicine, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Division of Cell Biology, Department of Human Biology, Neuroscience Institute, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Vanessa Chong-Morrison
- Radcliffe Department of Medicine, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Division of Biosciences, Faculty of Life Sciences, University College London, London, UK
| | - Stephen A Green
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Daria Gavriouchkina
- Radcliffe Department of Medicine, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Okinawa Institute of Science and Technology, Molecular Genetics Unit, Onna, Japan
| | - Ivan Candido-Ferreira
- Radcliffe Department of Medicine, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Irving T C Ling
- Radcliffe Department of Medicine, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Ruth M Williams
- Radcliffe Department of Medicine, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Chris T Amemiya
- Molecular Cell Biology, School of Natural Sciences, University of California, Merced, CA, USA
| | - Jeramiah J Smith
- Department of Biology, University of Kentucky, Lexington, KY, USA
| | - Marianne E Bronner
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Tatjana Sauka-Spengler
- Radcliffe Department of Medicine, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK.
| |
Collapse
|
22
|
Reese RM, Harrison MM, Alarid ET. Grainyhead-like Protein 2: The Emerging Role in Hormone-Dependent Cancers and Epigenetics. Endocrinology 2019; 160:1275-1288. [PMID: 30958537 DOI: 10.1210/en.2019-00213] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 04/02/2019] [Indexed: 01/16/2023]
Abstract
In mammals, the grainyhead-like transcription factor (GRHL) family is composed of three nuclear proteins that are responsible for driving epithelial cell fate: GRHL1, GRHL2, and GRHL3. GRHL2 is important in maintaining proper tubulogenesis during development and in suppressing the epithelial-to-mesenchymal transition. Within the last decade, evidence indicates both tumor-suppressive and oncogenic roles for GRHL2 in various types of cancers. Recent studies suggest that GRHL2 may be especially important in hormone-dependent cancers, as correlative relationships exist between GRHL2 and various steroid receptors, such as the androgen and estrogen receptors. Acting as a pioneer factor and coactivator, GRHL2 may directly affect steroid receptor transcriptional activity. This review will highlight recent discoveries of GRHL2 activity in cancer and in maintaining the epithelial state, while also exploring recent literature on the role of GRHL2 in hormone-dependent cancers and epigenetics.
Collapse
Affiliation(s)
- Rebecca M Reese
- Department of Oncology and Carbone Comprehensive Cancer Center, McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, Wisconsin
| | - Melissa M Harrison
- Department of Biomolecular Chemistry, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Elaine T Alarid
- Department of Oncology and Carbone Comprehensive Cancer Center, McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, Wisconsin
| |
Collapse
|
23
|
Pei D, Shu X, Gassama-Diagne A, Thiery JP. Mesenchymal–epithelial transition in development and reprogramming. Nat Cell Biol 2019; 21:44-53. [DOI: 10.1038/s41556-018-0195-z] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 08/10/2018] [Indexed: 02/07/2023]
|
24
|
Wang G, Pan J, Zhang L, Wang C. Overexpression of grainyhead-like transcription factor 2 is associated with poor prognosis in human pancreatic carcinoma. Oncol Lett 2018; 17:1491-1496. [PMID: 30675204 PMCID: PMC6341798 DOI: 10.3892/ol.2018.9741] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 10/03/2018] [Indexed: 12/23/2022] Open
Abstract
Recent studies have demonstrated that the abnormal expression of the grainyhead-like transcription factor 2 (GRHL2) gene contributes to the progression and poor prognosis of cancer through multiple mechanisms, but little is known about its expression status and prognostic value in pancreatic carcinoma (PC). The aim of the present study was to investigate the expression of GRHL2 in PC and to evaluate its clinicopathological and prognostic significance. Immunohistochemistry and western blotting were used to detect the expression of GRHL2 in PC tissues and cell lines, respectively. The expression of GRHL2 was investigated in 92 PC tissue samples by immunohistochemistry. High expression of GRHL2 was significantly associated with histological differentiation (P=0.018) and lymphatic metastasis (P=0.024). A Kaplan-Meier analysis revealed that high expression of GRHL2 was associated with worsened overall survival time (P<0.001). Multivariate analysis indicated that GRHL2 may be an independent prognostic factor for poor overall survival time (P=0.001). Additionally, western blot analysis demonstrated that the GRHL2 protein was highly expressed in PC cell lines. GRHL2 may serve an important role in the tumourigenesis of PC and serve as a potential therapeutic target for the prevention of PC progression.
Collapse
Affiliation(s)
- Gang Wang
- Department of General Surgery, Anhui Provincial Hospital Affiliated with Anhui Medical University, Anhui Province Key Laboratory of Hepatopancreatobiliary Surgery, Hefei, Anhui 230001, P.R. China
| | - Jingen Pan
- Department of General Surgery, Anhui Provincial Hospital Affiliated with Anhui Medical University, Anhui Province Key Laboratory of Hepatopancreatobiliary Surgery, Hefei, Anhui 230001, P.R. China
| | - Lu Zhang
- Department of General Surgery, Anhui Provincial Hospital Affiliated with Anhui Medical University, Anhui Province Key Laboratory of Hepatopancreatobiliary Surgery, Hefei, Anhui 230001, P.R. China
| | - Cheng Wang
- Department of General Surgery, Anhui Provincial Hospital Affiliated with Anhui Medical University, Anhui Province Key Laboratory of Hepatopancreatobiliary Surgery, Hefei, Anhui 230001, P.R. China
| |
Collapse
|
25
|
Naylor RW, Chang HHG, Qubisi S, Davidson AJ. A novel mechanism of gland formation in zebrafish involving transdifferentiation of renal epithelial cells and live cell extrusion. eLife 2018; 7:38911. [PMID: 30394875 PMCID: PMC6250424 DOI: 10.7554/elife.38911] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 11/05/2018] [Indexed: 12/12/2022] Open
Abstract
Transdifferentiation is the poorly understood phenomenon whereby a terminally differentiated cell acquires a completely new identity. Here, we describe a rare example of a naturally occurring transdifferentiation event in zebrafish in which kidney distal tubule epithelial cells are converted into an endocrine gland known as the Corpuscles of Stannius (CS). We find that this process requires Notch signalling and is associated with the cytoplasmic sequestration of the Hnf1b transcription factor, a master-regulator of renal tubule fate. A deficiency in the Irx3b transcription factor results in ectopic transdifferentiation of distal tubule cells to a CS identity but in a Notch-dependent fashion. Using live-cell imaging we show that CS cells undergo apical constriction en masse and are then extruded from the tubule to form a distinct organ. This system provides a valuable new model to understand the molecular and morphological basis of transdifferentiation and will advance efforts to exploit this rare phenomenon therapeutically.
Collapse
Affiliation(s)
- Richard W Naylor
- Department of Molecular Medicine and Pathology, University of Auckland, Auckland, New Zealand
| | - Hao-Han G Chang
- Department of Molecular Medicine and Pathology, University of Auckland, Auckland, New Zealand
| | - Sarah Qubisi
- Department of Molecular Medicine and Pathology, University of Auckland, Auckland, New Zealand
| | - Alan J Davidson
- Department of Molecular Medicine and Pathology, University of Auckland, Auckland, New Zealand
| |
Collapse
|
26
|
Caviglia S, Ober EA. Non-conventional protrusions: the diversity of cell interactions at short and long distance. Curr Opin Cell Biol 2018; 54:106-113. [DOI: 10.1016/j.ceb.2018.05.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/18/2018] [Accepted: 05/23/2018] [Indexed: 01/04/2023]
|
27
|
Cristo I, Carvalho L, Ponte S, Jacinto A. Novel role for Grainy head in the regulation of cytoskeletal and junctional dynamics during epithelial repair. J Cell Sci 2018; 131:jcs.213595. [PMID: 30131442 DOI: 10.1242/jcs.213595] [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: 12/05/2017] [Accepted: 08/06/2018] [Indexed: 12/23/2022] Open
Abstract
Tissue repair is critical for the maintenance of epithelial integrity and permeability. Simple epithelial repair relies on a combination of collective cell movements and the action of a contractile actomyosin cable at the wound edge that together promote the fast and efficient closure of tissue discontinuities. The Grainy head family of transcription factors (Grh in flies; GRHL1-GRHL3 in mammals) are essential proteins that have been implicated both in the development and repair of epithelia. However, the genes and the molecular mechanisms that it controls remain poorly understood. Here, we show that Grh knockdown disrupts actomyosin dynamics upon injury of the Drosophila pupa epithelial tissue. This leads to the formation of an ectopic actomyosin cable away from the wound edge and impaired wound closure. We also uncovered that E-Cadherin is downregulated in the Grh-depleted tissue around the wound, likely as a consequence of Dorsal (an NF-κB protein) misregulation, which also affects actomyosin cable formation. Our work highlights the importance of Grh as a stress response factor and its central role in the maintenance of epithelial characteristics necessary for tissue repair through regulating cytoskeleton and E-Cadherin dynamics.
Collapse
Affiliation(s)
- Inês Cristo
- CEDOC - Chronic Diseases Research Centre, NOVA Medical School, Universidade NOVA de Lisboa, 1169-056 Lisboa, Portugal
| | - Lara Carvalho
- CEDOC - Chronic Diseases Research Centre, NOVA Medical School, Universidade NOVA de Lisboa, 1169-056 Lisboa, Portugal
| | - Susana Ponte
- CEDOC - Chronic Diseases Research Centre, NOVA Medical School, Universidade NOVA de Lisboa, 1169-056 Lisboa, Portugal
| | - António Jacinto
- CEDOC - Chronic Diseases Research Centre, NOVA Medical School, Universidade NOVA de Lisboa, 1169-056 Lisboa, Portugal
| |
Collapse
|
28
|
Rogers CD, Nie S. Specifying neural crest cells: From chromatin to morphogens and factors in between. WILEY INTERDISCIPLINARY REVIEWS. DEVELOPMENTAL BIOLOGY 2018; 7:e322. [PMID: 29722151 PMCID: PMC6215528 DOI: 10.1002/wdev.322] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 03/26/2018] [Accepted: 03/27/2018] [Indexed: 12/16/2022]
Abstract
Neural crest (NC) cells are a stem-like multipotent population of progenitor cells that are present in vertebrate embryos, traveling to various regions in the developing organism. Known as the "fourth germ layer," these cells originate in the ectoderm between the neural plate (NP), which will become the brain and spinal cord, and nonneural tissues that will become the skin and the sensory organs. NC cells can differentiate into more than 30 different derivatives in response to the appropriate signals including, but not limited to, craniofacial bone and cartilage, sensory nerves and ganglia, pigment cells, and connective tissue. The molecular and cellular mechanisms that control the induction and specification of NC cells include epigenetic control, multiple interactive and redundant transcriptional pathways, secreted signaling molecules, and adhesion molecules. NC cells are important not only because they transform into a wide variety of tissue types, but also because their ability to detach from their epithelial neighbors and migrate throughout developing embryos utilizes mechanisms similar to those used by metastatic cancer cells. In this review, we discuss the mechanisms required for the induction and specification of NC cells in various vertebrate species, focusing on the roles of early morphogenesis, cell adhesion, signaling from adjacent tissues, and the massive transcriptional network that controls the formation of these amazing cells. This article is categorized under: Nervous System Development > Vertebrates: General Principles Gene Expression and Transcriptional Hierarchies > Regulatory Mechanisms Gene Expression and Transcriptional Hierarchies > Gene Networks and Genomics Signaling Pathways > Cell Fate Signaling.
Collapse
Affiliation(s)
- Crystal D. Rogers
- Department of Biology, College of Science and Mathematics, California State University Northridge, Northridge, California
| | - Shuyi Nie
- School of Biological Sciences and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia
| |
Collapse
|
29
|
Insights into the Etiology of Mammalian Neural Tube Closure Defects from Developmental, Genetic and Evolutionary Studies. J Dev Biol 2018; 6:jdb6030022. [PMID: 30134561 PMCID: PMC6162505 DOI: 10.3390/jdb6030022] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 08/13/2018] [Accepted: 08/15/2018] [Indexed: 02/06/2023] Open
Abstract
The human neural tube defects (NTD), anencephaly, spina bifida and craniorachischisis, originate from a failure of the embryonic neural tube to close. Human NTD are relatively common and both complex and heterogeneous in genetic origin, but the genetic variants and developmental mechanisms are largely unknown. Here we review the numerous studies, mainly in mice, of normal neural tube closure, the mechanisms of failure caused by specific gene mutations, and the evolution of the vertebrate cranial neural tube and its genetic processes, seeking insights into the etiology of human NTD. We find evidence of many regions along the anterior–posterior axis each differing in some aspect of neural tube closure—morphology, cell behavior, specific genes required—and conclude that the etiology of NTD is likely to be partly specific to the anterior–posterior location of the defect and also genetically heterogeneous. We revisit the hypotheses explaining the excess of females among cranial NTD cases in mice and humans and new developments in understanding the role of the folate pathway in NTD. Finally, we demonstrate that evidence from mouse mutants strongly supports the search for digenic or oligogenic etiology in human NTD of all types.
Collapse
|
30
|
Rogers CD, Sorrells LK, Bronner ME. A catenin-dependent balance between N-cadherin and E-cadherin controls neuroectodermal cell fate choices. Mech Dev 2018; 152:44-56. [PMID: 30009960 PMCID: PMC6112866 DOI: 10.1016/j.mod.2018.07.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 06/16/2018] [Accepted: 07/02/2018] [Indexed: 01/19/2023]
Abstract
Characterizing endogenous protein expression, interaction and function, this study identifies in vivo interactions and competitive balance between N-cadherin and E-cadherin in developing avian (Gallus gallus) neural and neural crest cells. Numerous cadherin proteins, including neural cadherin (Ncad) and epithelial cadherin (Ecad), are expressed in the developing neural plate as well as in neural crest cells as they delaminate from the newly closed neural tube. To clarify independent or coordinate function during development, we examined their expression in the cranial region. The results revealed surprising overlap and distinct localization of Ecad and Ncad in the neural tube. Using a proximity ligation assay and co-immunoprecipitation, we found that Ncad and Ecad formed heterotypic complexes in the developing neural tube, and that modulation of Ncad levels led to reciprocal gain or reduction of Ecad protein, which then alters ectodermal cell fate. Here, we demonstrate that the balance of Ecad and Ncad is dependent upon the availability of β-catenin proteins, and that alteration of either classical cadherin modifies the proportions of the neural crest and neuroectodermal cells that are specified.
Collapse
Affiliation(s)
- Crystal D Rogers
- Department of Biology, California State University, Northridge, Northridge, CA 91330, United States of America.
| | - Lisa K Sorrells
- Department of Biology, California State University, Northridge, Northridge, CA 91330, United States of America.
| | - Marianne E Bronner
- Division of Biology and Biological Engineering 139-74, California Institute of Technology, Pasadena, CA 91125, United States of America.
| |
Collapse
|
31
|
Chen AF, Liu AJ, Krishnakumar R, Freimer JW, DeVeale B, Blelloch R. GRHL2-Dependent Enhancer Switching Maintains a Pluripotent Stem Cell Transcriptional Subnetwork after Exit from Naive Pluripotency. Cell Stem Cell 2018; 23:226-238.e4. [PMID: 30017589 DOI: 10.1016/j.stem.2018.06.005] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 12/17/2017] [Accepted: 06/10/2018] [Indexed: 01/09/2023]
Abstract
The enhancer landscape of pluripotent stem cells undergoes extensive reorganization during early mammalian development. The functions and mechanisms behind such reorganization, however, are unclear. Here, we show that the transcription factor GRHL2 is necessary and sufficient to activate an epithelial subset of enhancers as naive embryonic stem cells (ESCs) transition into formative epiblast-like cells (EpiLCs). Surprisingly, many GRHL2 target genes do not change in expression during the ESC-EpiLC transition. Instead, enhancers regulating these genes in ESCs diminish in activity in EpiLCs while GRHL2-dependent alternative enhancers become activated to maintain transcription. GRHL2 therefore assumes control over a subset of the naive network via enhancer switching to maintain expression of epithelial genes upon exit from naive pluripotency. These data evoke a model where the naive pluripotency network becomes partitioned into smaller, independent networks regulated by EpiLC-specific transcription factors, thereby priming cells for lineage specification.
Collapse
Affiliation(s)
- Amy F Chen
- The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Center for Reproductive Sciences, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Urology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Arthur J Liu
- Department of Urology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Raga Krishnakumar
- The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Center for Reproductive Sciences, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Urology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Jacob W Freimer
- The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Center for Reproductive Sciences, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Urology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Brian DeVeale
- The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Center for Reproductive Sciences, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Urology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Robert Blelloch
- The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Center for Reproductive Sciences, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Urology, University of California, San Francisco, San Francisco, CA 94143, USA.
| |
Collapse
|
32
|
Lou W, Liu J, Gao Y, Zhong G, Ding B, Xu L, Fan W. MicroRNA regulation of liver cancer stem cells. Am J Cancer Res 2018; 8:1126-1141. [PMID: 30094089 PMCID: PMC6079154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 06/01/2018] [Indexed: 06/08/2023] Open
Abstract
MicroRNAs (miRNAs), a class of emerging small non-coding RNAs, serve as vital players in modulating multiple biological processes via the post-transcriptional regulation of gene expression. Dysregulated expression of miRNAs in liver cancer is well documented, and the involvement of miRNAs in liver cancer initiation and progression has also been described. Cancer stem cells (CSCs) are a subset of cells known to be at the root of cancer recurrence and resistance to therapy. In this review, we highlight recent reports indicating that miRNAs participate in the regulation of liver cancer stem cells (LCSCs). The Wnt signaling pathway, TGF-beta signaling pathway, JAK/STAT signaling pathway and epithelial-mesenchymal transition (EMT) are all closely correlated with the miRNA modulation of LCSCs. In addition, several miRNAs have been demonstrated to be involved in the regulation of LCSCs in response to therapy sensitivity. Targeting LCSCs by regulating the expression of these miRNAs represents a potential therapeutic strategy for treating cancer drug resistance, metastasis and recurrence in the near future.
Collapse
Affiliation(s)
- Weiyang Lou
- Program of Innovative Cancer Therapeutics, Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, College of Medicine, Zhejiang University, Key Laboratory of Organ TransplantationHangzhou 310003, Zhejiang Province, China
- Key Laboratory of Organ TransplantationHangzhou 310003, Zhejiang Province, China
- Key Laboratory of Combined Multi-organ Transplantation, Ministry of Public HealthHangzhou 310000, China
| | - Jingxing Liu
- Department of Intensive Care Unit, Changxing People’s Hospital of ZhejiangHuzhou 313100, Zhejiang Province, China
| | - Yanjia Gao
- Department of Anesthesiology, International Hospital of Zhejiang University, Shulan (Hangzhou) HospitalHangzhou 310003, Zhejiang Province, China
| | - Guansheng Zhong
- Department of Thyroid and Breast Surgery, Zhejiang Provincial People’s Hospital, People’s Hospital of Hangzhou Medical CollegeHangzhou 310000, Zhejiang Province, China
| | - Bisha Ding
- Program of Innovative Cancer Therapeutics, Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, College of Medicine, Zhejiang University, Key Laboratory of Organ TransplantationHangzhou 310003, Zhejiang Province, China
- Key Laboratory of Organ TransplantationHangzhou 310003, Zhejiang Province, China
- Key Laboratory of Combined Multi-organ Transplantation, Ministry of Public HealthHangzhou 310000, China
| | - Liang Xu
- Program of Innovative Cancer Therapeutics, Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, College of Medicine, Zhejiang University, Key Laboratory of Organ TransplantationHangzhou 310003, Zhejiang Province, China
- Key Laboratory of Organ TransplantationHangzhou 310003, Zhejiang Province, China
- Key Laboratory of Combined Multi-organ Transplantation, Ministry of Public HealthHangzhou 310000, China
| | - Weimin Fan
- Program of Innovative Cancer Therapeutics, Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, College of Medicine, Zhejiang University, Key Laboratory of Organ TransplantationHangzhou 310003, Zhejiang Province, China
- Key Laboratory of Organ TransplantationHangzhou 310003, Zhejiang Province, China
- Key Laboratory of Combined Multi-organ Transplantation, Ministry of Public HealthHangzhou 310000, China
- Department of Pathology and Laboratory Medicine, Medical University of South CarolinaCharleston, SC 29425, USA
| |
Collapse
|
33
|
Alkobtawi M, Ray H, Barriga EH, Moreno M, Kerney R, Monsoro-Burq AH, Saint-Jeannet JP, Mayor R. Characterization of Pax3 and Sox10 transgenic Xenopus laevis embryos as tools to study neural crest development. Dev Biol 2018. [PMID: 29522707 PMCID: PMC6453020 DOI: 10.1016/j.ydbio.2018.02.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The neural crest is a multipotent population of cells that originates a variety of cell types. Many animal models are used to study neural crest induction, migration and differentiation, with amphibians and birds being the most widely used systems. A major technological advance to study neural crest development in mouse, chick and zebrafish has been the generation of transgenic animals in which neural crest specific enhancers/promoters drive the expression of either fluorescent proteins for use as lineage tracers, or modified genes for use in functional studies. Unfortunately, no such transgenic animals currently exist for the amphibians Xenopus laevis and tropicalis, key model systems for studying neural crest development. Here we describe the generation and characterization of two transgenic Xenopus laevis lines, Pax3-GFP and Sox10-GFP, in which GFP is expressed in the pre-migratory and migratory neural crest, respectively. We show that Pax3-GFP could be a powerful tool to study neural crest induction, whereas Sox10-GFP could be used in the study of neural crest migration in living embryos. Pax3-GFP Xenopus laves transgenic expresses GFP in pre-migratory neural crest Pax3-GFP Xenopus laevis transgenic responds to Wnt signalling Sox10-GFP Xenopus laevis transgenic expresses GFP in migrating neural crest Pax3-GFP and Sox10-GFP Xenopus laevis transgenic represent potential tools to study neural crest induction and migration
Collapse
Affiliation(s)
- Mansour Alkobtawi
- UMR3347 Université Paris Sud-Paris Saclay, Institut Curie/CNRS/U1021 INSERM, Centre Universitaire bât, 110 91405 ORSAY Cedex, Paris, France
| | - Heather Ray
- Dept. of Cell, Developmental and Integrative Biology, The University of Alabama at Birmingham MCLM 338, 1918 University Dr. Birmingham, AL 35294, USA
| | - Elias H Barriga
- Department of Cell and Developmental Biology, University College London, Gower Street, WC1E 6BT, London, UK
| | - Mauricio Moreno
- Department of Cell and Developmental Biology, University College London, Gower Street, WC1E 6BT, London, UK
| | - Ryan Kerney
- Department of Biology, Gettysburg College Gettysburg, PA 17325, USA
| | - Anne-Helene Monsoro-Burq
- UMR3347 Université Paris Sud-Paris Saclay, Institut Curie/CNRS/U1021 INSERM, Centre Universitaire bât, 110 91405 ORSAY Cedex, Paris, France; Institut Universitaire de France, 75005, Paris France
| | - Jean-Pierre Saint-Jeannet
- New York University, College of Dentistry, Department of Basic Science&Craniofacial Biology, New York, NY 10010, USA
| | - Roberto Mayor
- Department of Cell and Developmental Biology, University College London, Gower Street, WC1E 6BT, London, UK.
| |
Collapse
|
34
|
Hinze C, Ruffert J, Walentin K, Himmerkus N, Nikpey E, Tenstad O, Wiig H, Mutig K, Yurtdas ZY, Klein JD, Sands JM, Branchi F, Schumann M, Bachmann S, Bleich M, Schmidt-Ott KM. GRHL2 Is Required for Collecting Duct Epithelial Barrier Function and Renal Osmoregulation. J Am Soc Nephrol 2017; 29:857-868. [PMID: 29237740 DOI: 10.1681/asn.2017030353] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 11/09/2017] [Indexed: 12/31/2022] Open
Abstract
Collecting ducts make up the distal-most tubular segments of the kidney, extending from the cortex, where they connect to the nephron proper, into the medulla, where they release urine into the renal pelvis. During water deprivation, body water preservation is ensured by the selective transepithelial reabsorption of water into the hypertonic medullary interstitium mediated by collecting ducts. The collecting duct epithelium forms tight junctions composed of barrier-enforcing claudins and exhibits a higher transepithelial resistance than other segments of the renal tubule exhibit. However, the functional relevance of this strong collecting duct epithelial barrier is unresolved. Here, we report that collecting duct-specific deletion of an epithelial transcription factor, grainyhead-like 2 (GRHL2), in mice led to reduced expression of tight junction-associated barrier components, reduced collecting duct transepithelial resistance, and defective renal medullary accumulation of sodium and other osmolytes. In vitro, Grhl2-deficient collecting duct cells displayed increased paracellular flux of sodium, chloride, and urea. Consistent with these effects, Grhl2-deficient mice had diabetes insipidus, produced dilute urine, and failed to adequately concentrate their urine after water restriction, resulting in susceptibility to prerenal azotemia. These data indicate a direct functional link between collecting duct epithelial barrier characteristics, which appear to prevent leakage of interstitial osmolytes into urine, and body water homeostasis.
Collapse
Affiliation(s)
- Christian Hinze
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,Berlin Institute of Health, Berlin, Germany.,Departments of Nephrology and Medical Intensive Care
| | - Janett Ruffert
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,Berlin Institute of Urologic Research, Berlin, Germany
| | - Katharina Walentin
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Nina Himmerkus
- Institute of Physiology, Christian Albrechts University Kiel, Kiel, Germany
| | - Elham Nikpey
- Department of Biomedicine, University of Bergen, Bergen, Norway.,Department of Medicine, Haukeland University Hospital, Bergen, Norway; and
| | - Olav Tenstad
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Helge Wiig
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | | | - Zeliha Yesim Yurtdas
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,Berlin Institute of Urologic Research, Berlin, Germany
| | - Janet D Klein
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Jeff M Sands
- Renal Division, Department of Medicine, Emory University, Atlanta, Georgia
| | - Federica Branchi
- Gastroenterology, Infectious Diseases and Rheumatology, Charité Universitätsmedizin, Berlin, Germany
| | - Michael Schumann
- Gastroenterology, Infectious Diseases and Rheumatology, Charité Universitätsmedizin, Berlin, Germany
| | | | - Markus Bleich
- Institute of Physiology, Christian Albrechts University Kiel, Kiel, Germany
| | - Kai M Schmidt-Ott
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany; .,Departments of Nephrology and Medical Intensive Care
| |
Collapse
|
35
|
Nikolopoulou E, Galea GL, Rolo A, Greene NDE, Copp AJ. Neural tube closure: cellular, molecular and biomechanical mechanisms. Development 2017; 144:552-566. [PMID: 28196803 DOI: 10.1242/dev.145904] [Citation(s) in RCA: 313] [Impact Index Per Article: 44.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Neural tube closure has been studied for many decades, across a range of vertebrates, as a paradigm of embryonic morphogenesis. Neurulation is of particular interest in view of the severe congenital malformations - 'neural tube defects' - that result when closure fails. The process of neural tube closure is complex and involves cellular events such as convergent extension, apical constriction and interkinetic nuclear migration, as well as precise molecular control via the non-canonical Wnt/planar cell polarity pathway, Shh/BMP signalling, and the transcription factors Grhl2/3, Pax3, Cdx2 and Zic2. More recently, biomechanical inputs into neural tube morphogenesis have also been identified. Here, we review these cellular, molecular and biomechanical mechanisms involved in neural tube closure, based on studies of various vertebrate species, focusing on the most recent advances in the field.
Collapse
Affiliation(s)
- Evanthia Nikolopoulou
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
| | - Gabriel L Galea
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
| | - Ana Rolo
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
| | - Nicholas D E Greene
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
| | - Andrew J Copp
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
| |
Collapse
|
36
|
Neumann DP, Goodall GJ, Gregory PA. Regulation of splicing and circularisation of RNA in epithelial mesenchymal plasticity. Semin Cell Dev Biol 2017; 75:50-60. [PMID: 28789987 DOI: 10.1016/j.semcdb.2017.08.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 07/28/2017] [Accepted: 08/03/2017] [Indexed: 12/13/2022]
Abstract
Interconversions between epithelial and mesenchymal states, often referred to as epithelial mesenchymal transition (EMT) and its reverse MET, play important roles in embryonic development and are recapitulated in various adult pathologies including cancer progression. These conversions are regulated by complex transcriptional and post-transcriptional mechanisms including programs of alternative splicing which are orchestrated by specific splicing factors. This review will focus on the latest developments in our understanding of the splicing factors regulating epithelial mesenchymal plasticity associated with cancer progression and the induction of pluripotency, including potential roles for circular RNAs (circRNAs) which have been recently implicated in these processes.
Collapse
Affiliation(s)
- Daniel P Neumann
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, SA, 5000, Australia
| | - Gregory J Goodall
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, SA, 5000, Australia; Discipline of Medicine, The University of Adelaide, Adelaide, SA 5005, Australia; School of Molecular and Biomedical Science, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Philip A Gregory
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, SA, 5000, Australia; Discipline of Medicine, The University of Adelaide, Adelaide, SA 5005, Australia.
| |
Collapse
|
37
|
Tanimizu N, Mitaka T. Epithelial Morphogenesis during Liver Development. Cold Spring Harb Perspect Biol 2017; 9:cshperspect.a027862. [PMID: 28213465 DOI: 10.1101/cshperspect.a027862] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Tissue stem/progenitor cells supply multiple types of epithelial cells that eventually acquire specialized functions during organ development. In addition, three-dimensional (3D) tissue structures need to be established for organs to perform their physiological functions. The liver contains two types of epithelial cells, namely, hepatocytes and cholangiocytes, which are derived from hepatoblasts, fetal liver stem/progenitor cells (LPCs), in mid-gestation. Hepatocytes performing many metabolic reactions form cord-like structures, whereas cholangiocytes, biliary epithelial cells, form tubular structures called intrahepatic bile ducts. Analyses for human genetic diseases and mutant mice have identified crucial molecules for liver organogenesis. Functions of those molecules can be examined in in vitro culture systems where LPCs are induced to differentiate into hepatocytes or cholangiocytes. Recent technical advances have revealed 3D epithelial morphogenesis during liver organogenesis. Therefore, the liver is a good model to understand how tissue stem/progenitor cells differentiate and establish 3D tissue architectures during organ development.
Collapse
Affiliation(s)
- Naoki Tanimizu
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Chuo-ku, Sapporo 060-8556, Japan
| | - Toshihiro Mitaka
- Department of Tissue Development and Regeneration, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Chuo-ku, Sapporo 060-8556, Japan
| |
Collapse
|
38
|
Frisch SM, Farris JC, Pifer PM. Roles of Grainyhead-like transcription factors in cancer. Oncogene 2017; 36:6067-6073. [PMID: 28714958 DOI: 10.1038/onc.2017.178] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 04/12/2017] [Accepted: 05/04/2017] [Indexed: 12/18/2022]
Abstract
The mammalian homologs of the D. melanogaster Grainyhead gene, Grainyhead-like 1-3 (GRHL1, GRHL2 and GRHL3), are transcription factors implicated in wound healing, tubulogenesis and cancer. Their induced target genes encode diverse epithelial cell adhesion molecules, while mesenchymal genes involved in cell migration and invasion are repressed. Moreover, GRHL2 suppresses the oncogenic epithelial-mesencyhmal transition, thereby acting as a tumor suppressor. Mechanisms, some involving established cancer-related signaling/transcription factor pathways (for example, Wnt, TGF-β, mir200, ZEB1, OVOL2, p63 and p300) and translational implications of the Grainyhead proteins in cancer are discussed in this review article.
Collapse
Affiliation(s)
- S M Frisch
- West Virginia University Cancer Institute, West Virginia University, Morgantown, WV, USA
| | - J C Farris
- West Virginia University Cancer Institute, West Virginia University, Morgantown, WV, USA
| | - P M Pifer
- West Virginia University Cancer Institute, West Virginia University, Morgantown, WV, USA
| |
Collapse
|
39
|
Abstract
Grainyhead-like 2 is a human homolog of Drosophila grainyhead. It inhibits epithelial-to-mesenchymal transition that is necessary for cell migration, and it is involved in neural tube closure, epithelial morphogenesis, and barrier formation during embryogenesis by regulation of the expression of cell junction proteins such as E-cadherin and vimentin. Cancer shares many common characters with development such as epithelial-to-mesenchymal transition. In addition to its important role in development, grainyhead-like 2 is implicated in carcinogenesis as well. However, the reports on grainyhead-like 2 in various cancers are controversial. Grainyhead-like 2 can act as either a tumor suppressor or an oncogene with the mechanisms not well elucidated. In this review, we summarized recent progress on grainyhead-like 2 in development and cancer in order to get an insight into the regulation network of grainyhead-like 2 and understand the roles of grainyhead-like 2 in various cancers.
Collapse
Affiliation(s)
- Lijun Ma
- 1 Department of Oncology, Tongren Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, P.R. China
| | - Hongli Yan
- 3 Department of Laboratory Medicine, Changhai Hospital, The Second Military Medical University, Shanghai, P.R. China
| | - Hui Zhao
- 4 School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong
| | - Jianmin Sun
- 2 Department of Pathogen Biology and Immunology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, P.R. China.,5 Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University, Lund, Sweden.,6 Lund Stem Cell Center, Department of Laboratory Medicine, Lund University, Lund, Sweden
| |
Collapse
|
40
|
Dworkin S, Auden A, Partridge DD, Daglas M, Medcalf RL, Mantamadiotis T, Georgy SR, Darido C, Jane SM, Ting SB. Grainyhead-like 3 (Grhl3) deficiency in brain leads to altered locomotor activity and decreased anxiety-like behaviors in aged mice. Dev Neurobiol 2017; 77:775-788. [PMID: 27907249 DOI: 10.1002/dneu.22469] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 10/17/2016] [Accepted: 11/15/2016] [Indexed: 01/24/2023]
Abstract
The highly conserved Grainyhead-like (Grhl) family of transcription factors, comprising three members in vertebrates (Grhl1-3), play critical regulatory roles during embryonic development, cellular proliferation, and apoptosis. Although loss of Grhl function leads to multiple neural abnormalities in numerous animal models, a comprehensive analysis of Grhl expression and function in the mammalian brain has not been reported. Here they show that only Grhl3 expression is detectable in the embryonic mouse brain; particularly within the habenula, an organ known to modulate repressive behaviors. Using both Grhl3-knockout mice (Grhl3-/- ), and brain-specific conditional deletion of Grhl3 in adult mice (Nestin-Cre/Grhl3flox/flox ), they performed histological expression analyses and behavioral tests to assess long-term effects of Grhl3 loss on motor co-ordination, spatial memory, anxiety, and stress. They found that complete deletion of Grhl3 did not lead to noticeable structural or cell-intrinsic defects in the embryonic brain; however, aged Grhl3 conditional knockout (cKO) mice showed enlarged lateral ventricles and displayed marked changes in motor function and behaviors suggestive of decreased fear and anxiety. They conclude that loss of Grhl3 in the brain leads to significant alterations in locomotor activity and decreased self-inhibition, and as such, these mice may serve as a novel model of human conditions of impulsive behavior or hyperactivity. © 2017 Wiley Periodicals, Inc. Develop Neurobiol 77: 775-788, 2017.
Collapse
Affiliation(s)
- Sebastian Dworkin
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3181, Australia
| | - Alana Auden
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3181, Australia
| | - Darren D Partridge
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3181, Australia
| | - Maria Daglas
- Molecular Neurotrauma and Haemostasis, Australian Centre for Blood Diseases, Monash University Central Clinical School, Prahran, Victoria, 3181, Australia
| | - Robert L Medcalf
- Molecular Neurotrauma and Haemostasis, Australian Centre for Blood Diseases, Monash University Central Clinical School, Prahran, Victoria, 3181, Australia
| | - Theo Mantamadiotis
- Department of Pathology, University of Melbourne, Parkville, Victoria, 3050, Australia
| | - Smitha R Georgy
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3181, Australia
| | - Charbel Darido
- Peter MacCallum Cancer Centre, The Victorian Comprehensive Cancer Centre, Parkville, Victoria, 3050, Australia
| | - Stephen M Jane
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3181, Australia.,Department of Hematology, Alfred Hospital, Prahran, Victoria, 3181, Australia
| | - Stephen B Ting
- Department of Medicine, Monash University Central Clinical School, Prahran, Victoria, 3181, Australia.,Department of Hematology, Alfred Hospital, Prahran, Victoria, 3181, Australia
| |
Collapse
|
41
|
Zak J, Vives V, Szumska D, Vernet A, Schneider JE, Miller P, Slee EA, Joss S, Lacassie Y, Chen E, Escobar LF, Tucker M, Aylsworth AS, Dubbs HA, Collins AT, Andrieux J, Dieux-Coeslier A, Haberlandt E, Kotzot D, Scott DA, Parker MJ, Zakaria Z, Choy YS, Wieczorek D, Innes AM, Jun KR, Zinner S, Prin F, Lygate CA, Pretorius P, Rosenfeld JA, Mohun TJ, Lu X. ASPP2 deficiency causes features of 1q41q42 microdeletion syndrome. Cell Death Differ 2016; 23:1973-1984. [PMID: 27447114 PMCID: PMC5136487 DOI: 10.1038/cdd.2016.76] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 06/09/2016] [Accepted: 06/13/2016] [Indexed: 11/09/2022] Open
Abstract
Chromosomal abnormalities are implicated in a substantial number of human developmental syndromes, but for many such disorders little is known about the causative genes. The recently described 1q41q42 microdeletion syndrome is characterized by characteristic dysmorphic features, intellectual disability and brain morphological abnormalities, but the precise genetic basis for these abnormalities remains unknown. Here, our detailed analysis of the genetic abnormalities of 1q41q42 microdeletion cases identified TP53BP2, which encodes apoptosis-stimulating protein of p53 2 (ASPP2), as a candidate gene for brain abnormalities. Consistent with this, Trp53bp2-deficient mice show dilation of lateral ventricles resembling the phenotype of 1q41q42 microdeletion patients. Trp53bp2 deficiency causes 100% neonatal lethality in the C57BL/6 background associated with a high incidence of neural tube defects and a range of developmental abnormalities such as congenital heart defects, coloboma, microphthalmia, urogenital and craniofacial abnormalities. Interestingly, abnormalities show a high degree of overlap with 1q41q42 microdeletion-associated abnormalities. These findings identify TP53BP2 as a strong candidate causative gene for central nervous system (CNS) defects in 1q41q42 microdeletion syndrome, and open new avenues for investigation of the mechanisms underlying CNS abnormalities.
Collapse
Affiliation(s)
- J Zak
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - V Vives
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - D Szumska
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford OX3 7BN, UK
| | - A Vernet
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford OX3 7BN, UK
| | - J E Schneider
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford OX3 7BN, UK
| | - P Miller
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - E A Slee
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - S Joss
- Queen Elizabeth University Hospital Glasgow, Glasgow G51 4TF, UK
| | - Y Lacassie
- Department of Pediatrics, Louisiana State University, New Orleans, LA 70118, USA
- Genetics Services, Children's Hospital New Orleans, New Orleans, LA 70118, USA
| | - E Chen
- Kaiser Permanente, San Francisco Medical Center, San Francisco, CA 94115, USA
| | - L F Escobar
- St Vincent Children's Hospital, Indianapolis, IN 46260, USA
| | - M Tucker
- St Vincent Children's Hospital, Indianapolis, IN 46260, USA
| | - A S Aylsworth
- Departments of Pediatrics and Genetics, University of North Carolina, Chapel Hill, NC 27599, USA
| | - H A Dubbs
- Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - A T Collins
- Seattle Children's Hospital, Seattle, WA 98105, USA
| | - J Andrieux
- Institute of Medical Genetics, Jeanne de Flandre Hospital, CHRU de Lille, Lille 59000, France
| | | | - E Haberlandt
- Clinical Department of Pediatrics, Innsbruck Medical University, Innsbruck A-6020, Austria
| | - D Kotzot
- Division of Human Genetics, Department of Medical Genetics, Molecular and Clinical Pharmacology, Innsbruck Medical University, Innsbruck A-6020, Austria
| | - D A Scott
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - M J Parker
- Sheffield Children's Hospital NHS Foundation Trust, Western Bank, Sheffield, S10 2TH, UK
| | - Z Zakaria
- Institute for Medical Research, Kuala Lumpur, Jalan Pahang 50588, Malaysia
| | - Y S Choy
- Prince Court Medical Centre, Kuala Lumpur 50450, Malaysia
| | - D Wieczorek
- Institute of Human Genetics, University Clinic Essen, Duisburg-Essen University, Essen 45122, Germany
- Institute of Human Genetics, University Clinic, Heinrich-Heine University, Düsseldorf 40225, Germany
| | - A M Innes
- Department of Medical Genetics and Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada T3B 6A8
| | - K R Jun
- Department of Laboratory Medicine, Haeundae Paik Hospital, Inje University, Haeundae-gu, Busan, Korea
| | - S Zinner
- Seattle Children's Hospital, Seattle, WA 98105, USA
| | - F Prin
- The Francis Crick Institute Mill Hill Laboratory, London NW7 1AA, UK
| | - C A Lygate
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford OX3 7BN, UK
| | - P Pretorius
- Department of Neuroradiology, John Radcliffe Hospital, Oxford University Hospitals NHS Trust, Oxford OX3 9DU, UK
| | - J A Rosenfeld
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - T J Mohun
- The Francis Crick Institute Mill Hill Laboratory, London NW7 1AA, UK
| | - X Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| |
Collapse
|
42
|
Göttgens EL, Span PN, Zegers MM. Roles and Regulation of Epithelial Splicing Regulatory Proteins 1 and 2 in Epithelial-Mesenchymal Transition. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2016; 327:163-194. [PMID: 27692175 DOI: 10.1016/bs.ircmb.2016.06.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The transformation of polarized epithelial cells into cells with mesenchymal characteristics by the morphogenetic process of epithelial-mesenchymal transition (EMT) is a well-characterized process essential for embryonic development and associated with cancer progression. EMT is a program driven by changes in gene expression induced by several EMT-specific transcription factors, which inhibit the expression of cell-cell adhesion proteins and other epithelial markers, causing a characteristic loss of cell-cell adhesion, a switch to mesenchymal cell morphology, and increased migratory capabilities. Recently, it has become apparent that in addition to these transcriptionally regulated changes, EMT may also be regulated posttranscriptionally, that is, by alternative splicing. Specifically, the epithelial splicing regulatory proteins 1 and 2 (ESRP1 and ESRP2) have been described as epithelial-specific splicing master regulators specifically involved in EMT-associated alternative splicing. Here, we discuss the regulation of ESRP activity, as well as the evidence supporting a causal role of ESRPs in EMT.
Collapse
Affiliation(s)
- E-L Göttgens
- Department of Radiation Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - P N Span
- Department of Radiation Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - M M Zegers
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands.
| |
Collapse
|
43
|
Rolo A, Savery D, Escuin S, de Castro SC, Armer HEJ, Munro PMG, Molè MA, Greene NDE, Copp AJ. Regulation of cell protrusions by small GTPases during fusion of the neural folds. eLife 2016; 5:e13273. [PMID: 27114066 PMCID: PMC4846376 DOI: 10.7554/elife.13273] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 03/18/2016] [Indexed: 11/26/2022] Open
Abstract
Epithelial fusion is a crucial process in embryonic development, and its failure underlies several clinically important birth defects. For example, failure of neural fold fusion during neurulation leads to open neural tube defects including spina bifida. Using mouse embryos, we show that cell protrusions emanating from the apposed neural fold tips, at the interface between the neuroepithelium and the surface ectoderm, are required for completion of neural tube closure. By genetically ablating the cytoskeletal regulators Rac1 or Cdc42 in the dorsal neuroepithelium, or in the surface ectoderm, we show that these protrusions originate from surface ectodermal cells and that Rac1 is necessary for the formation of membrane ruffles which typify late closure stages, whereas Cdc42 is required for the predominance of filopodia in early neurulation. This study provides evidence for the essential role and molecular regulation of membrane protrusions prior to fusion of a key organ primordium in mammalian development. DOI:http://dx.doi.org/10.7554/eLife.13273.001 The neural tube is an embryonic structure that gives rise to the brain and spinal cord. It originates from a flat sheet of cells – the neural plate – that rolls up and fuses to form a tube during development. If this closure fails, it leads to birth defects such as spina bifida, a condition that causes severe disability because babies are born with an exposed and damaged spinal cord. As the edges of the neural plate meet, they need to fuse together to produce a closed tube. It was known that cells at these edges extend protrusions. However, it was unclear how these protrusions are regulated, whether they arise from neural or non-neural cells and whether or not they are required for the neural tube to close fully. By studying mutant mouse embryos, Rolo et al. found that cellular protrusions are indeed required for the neural tube to close completely. These protrusions proved to be regulated by proteins called Rac1 and Cdc42, which control the filaments inside the cell that are responsible for cell shape and movement. Rolo et al. also found that the cells that give rise to the protrusions are not part of the neural plate itself. Instead, these cells are neighboring cells from the layer that later forms the epidermis of the skin (the surface ectoderm). Future studies will need to investigate which signals instruct those precise cells to make protrusions and to discover what happens to the protrusions after contact is made with cells on the opposite side. It will also be important to determine whether spina bifida may arise in humans if the protrusions are defective or absent. DOI:http://dx.doi.org/10.7554/eLife.13273.002
Collapse
Affiliation(s)
- Ana Rolo
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| | - Dawn Savery
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| | - Sarah Escuin
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| | - Sandra C de Castro
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| | - Hannah E J Armer
- Imaging Unit, Institute of Ophthalmology, University College London, London, United Kingdom
| | - Peter M G Munro
- Imaging Unit, Institute of Ophthalmology, University College London, London, United Kingdom
| | - Matteo A Molè
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| | - Nicholas D E Greene
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| | - Andrew J Copp
- Newlife Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| |
Collapse
|
44
|
Ray HJ, Niswander L. Grainyhead-like 2 downstream targets act to suppress epithelial-to-mesenchymal transition during neural tube closure. J Cell Sci 2016. [DOI: 10.1242/jcs.190140] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|