1
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Werren EA, Kalsner L, Ewald J, Peracchio M, King C, Vats P, Audano PA, Robinson PN, Adams MD, Kelly MA, Matson AP. A de novo variant in PAK2 detected in an individual with Knobloch type 2 syndrome. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.18.590108. [PMID: 38712026 PMCID: PMC11071314 DOI: 10.1101/2024.04.18.590108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
P21-activated kinase 2 (PAK2) is a serine/threonine kinase essential for a variety of cellular processes including signal transduction, cellular survival, proliferation, and migration. A recent report proposed monoallelic PAK2 variants cause Knobloch syndrome type 2 (KNO2)-a developmental disorder primarily characterized by ocular anomalies. Here, we identified a novel de novo heterozygous missense variant in PAK2, NM_002577.4:c.1273G>A, p.(D425N), by whole genome sequencing in an individual with features consistent with KNO2. Notable clinical phenotypes include global developmental delay, congenital retinal detachment, mild cerebral ventriculomegaly, hypotonia, FTT, pyloric stenosis, feeding intolerance, patent ductus arteriosus, and mild facial dysmorphism. The p.(D425N) variant lies within the protein kinase domain and is predicted to be functionally damaging by in silico analysis. Previous clinical genetic testing did not report this variant due to unknown relevance of PAK2 variants at the time of testing, highlighting the importance of reanalysis. Our findings also substantiate the candidacy of PAK2 variants in KNO2 and expand the KNO2 clinical spectrum.
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Affiliation(s)
- Elizabeth A Werren
- The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut, 06032, USA
| | - Louisa Kalsner
- Connecticut Children's Medical Center, Hartford, CT 06106, USA
| | - Jessica Ewald
- The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut, 06032, USA
| | | | - Cameron King
- Connecticut Children's Medical Center, Hartford, CT 06106, USA
| | - Purva Vats
- The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut, 06032, USA
| | - Peter A Audano
- The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut, 06032, USA
| | - Peter N Robinson
- The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut, 06032, USA
| | - Mark D Adams
- The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut, 06032, USA
| | - Melissa A Kelly
- The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut, 06032, USA
| | - Adam P Matson
- Connecticut Children's Medical Center, Hartford, CT 06106, USA
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2
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Arena AF, Escudero J, Shaye DD. A metazoan-specific C-terminal motif in EXC-4 and Gα-Rho/Rac signaling regulate cell outgrowth during tubulogenesis in C. elegans. Development 2022; 149:285944. [PMID: 36398726 PMCID: PMC10108608 DOI: 10.1242/dev.200748] [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: 03/11/2022] [Accepted: 11/07/2022] [Indexed: 11/19/2022]
Abstract
Chloride intracellular channels (CLICs) are conserved proteins for which the cellular and molecular functions remain mysterious. An important insight into CLIC function came from the discovery that Caenorhabditis elegans EXC-4/CLIC regulates morphogenesis of the excretory canal (ExCa) cell, a single-cell tube. Subsequent work showed that mammalian CLICs regulate vascular development and angiogenesis, and human CLIC1 can rescue exc-4 mutants, suggesting conserved function in biological tube formation (tubulogenesis) and maintenance. However, the cell behaviors and signaling pathways regulated by EXC-4/CLICs during tubulogenesis in vivo remain largely unknown. We report a new exc-4 mutation, affecting a C-terminal residue conserved in virtually all metazoan CLICs, that reveals a specific role for EXC-4 in ExCa outgrowth. Cell culture studies suggest a function for CLICs in heterotrimeric G protein (Gα/β/γ)-Rho/Rac signaling, and Rho-family GTPases are common regulators of cell outgrowth. Using our new exc-4 mutant, we describe a previously unknown function for Gα-encoding genes (gpa-12/Gα12/13, gpa-7/Gαi, egl-30/Gαq and gsa-1/Gαs), ced-10/Rac and mig-2/RhoG in EXC-4-mediated ExCa outgrowth. Our results demonstrate that EXC-4/CLICs are primordial players in Gα-Rho/Rac-signaling, a pathway that is crucial for tubulogenesis in C. elegans and in vascular development.
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Affiliation(s)
- Anthony F Arena
- Department of Physiology and Biophysics, University of Illinois at Chicago - College of Medicine, Chicago, IL 60612, USA.,Graduate Education in Biomedical Sciences program, University of Illinois at Chicago - College of Medicine, Chicago, IL 60612, USA
| | - Julianna Escudero
- Department of Physiology and Biophysics, University of Illinois at Chicago - College of Medicine, Chicago, IL 60612, USA
| | - Daniel D Shaye
- Department of Physiology and Biophysics, University of Illinois at Chicago - College of Medicine, Chicago, IL 60612, USA.,Center for Cardiovascular Research, University of Illinois at Chicago - College of Medicine, Chicago, IL 60612, USA
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3
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p21-Activated kinase 1 (PAK1) in aging and longevity: An overview. Ageing Res Rev 2021; 71:101443. [PMID: 34390849 DOI: 10.1016/j.arr.2021.101443] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 07/26/2021] [Accepted: 08/10/2021] [Indexed: 02/08/2023]
Abstract
The p21-activated kinases (PAKs) belong to serine/threonine kinases family, regulated by ∼21 kDa small signaling G proteins RAC1 and CDC42. The mammalian PAK family comprises six members (PAK1-6) that are classified into two groups (I and II) based on their domain architecture and regulatory mechanisms. PAKs are implicated in a wide range of cellular functions. PAK1 has recently attracted increasing attention owing to its involvement in oncogenesis, tumor progression, and metastasis as well as several life-limiting diseases and pathological conditions. In Caenorhabditis elegans, PAK1 functions limit the lifespan under basal conditions by inhibiting forkhead transcription factor DAF-16. Interestingly, PAK depletion extended longevity and attenuated the onset of age-related phenotypes in a premature-aging mouse model and delayed senescence in mammalian fibroblasts. These observations implicate PAKs as not only oncogenic but also aging kinases. Therefore, PAK-targeting genetic and/or pharmacological interventions, particularly PAK1-targeting, could be a viable strategy for developing cancer therapies with relatively no side effects and promoting healthy longevity. This review describes PAK family proteins, their biological functions, and their role in regulating aging and longevity using C. elegans. Moreover, we discuss the effect of small-molecule PAK1 inhibitors on the lifespan and healthspan of C. elegans.
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4
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Riga A, Cravo J, Schmidt R, Pires HR, Castiglioni VG, van den Heuvel S, Boxem M. Caenorhabditis elegans LET-413 Scribble is essential in the epidermis for growth, viability, and directional outgrowth of epithelial seam cells. PLoS Genet 2021; 17:e1009856. [PMID: 34673778 PMCID: PMC8570498 DOI: 10.1371/journal.pgen.1009856] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 11/05/2021] [Accepted: 10/04/2021] [Indexed: 12/12/2022] Open
Abstract
The conserved adapter protein Scribble (Scrib) plays essential roles in a variety of cellular processes, including polarity establishment, proliferation, and directed cell migration. While the mechanisms through which Scrib promotes epithelial polarity are beginning to be unraveled, its roles in other cellular processes including cell migration remain enigmatic. In C. elegans, the Scrib ortholog LET-413 is essential for apical–basal polarization and junction formation in embryonic epithelia. However, whether LET-413 is required for postembryonic development or plays a role in migratory events is not known. Here, we use inducible protein degradation to investigate the functioning of LET-413 in larval epithelia. We find that LET-413 is essential in the epidermal epithelium for growth, viability, and junction maintenance. In addition, we identify a novel role for LET-413 in the polarized outgrowth of the epidermal seam cells. These stem cell-like epithelial cells extend anterior and posterior directed apical protrusions in each larval stage to reconnect to their neighbors. We show that the role of LET-413 in seam cell outgrowth is likely mediated largely by the junctional component DLG-1 discs large, which we demonstrate is also essential for directed outgrowth of the seam cells. Our data uncover multiple essential functions for LET-413 in larval development and show that the polarized outgrowth of the epithelial seam cells is controlled by LET-413 Scribble and DLG-1 Discs large. Most cells in multicellular organisms are organized along a directional axis of cell polarity. One protein that is important for this polarized organization is the conserved polarity regulator Scribble. This protein has several functions, including forming the basolateral domains of cells, promoting the formation of cell junctions, and promoting cell migration. How Scribble performs these functions is not fully understood. In this paper we study the role of Scribble during larval development of the small nematode Caenorhabditis elegans using an inducible protein degradation system. We show that Scribble, called LET-413 in C. elegans, is essential in the epidermal epithelium for animal development, as depletion of LET-413 in only this tissue blocks growth. We also demonstrate that LET-413 is required for the polarized outgrowth of an epithelial cell type called the seam cells, a process resembling cell migration. Finally, we show that one major function of LET-413 in seam cell outgrowth is the localization of the junctional component Discs large (DLG-1), which we demonstrate is also essential for this process. Our data thus uncover multiple essential functions for LET-413 in larval development and provide new insights into how the directional outgrowth of epithelial seam cells is controlled.
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Affiliation(s)
- Amalia Riga
- Division of Developmental Biology, Institute of Biodynamics and Biocomplexity, Department of Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Janine Cravo
- Division of Developmental Biology, Institute of Biodynamics and Biocomplexity, Department of Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Ruben Schmidt
- Division of Developmental Biology, Institute of Biodynamics and Biocomplexity, Department of Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Helena R. Pires
- Division of Developmental Biology, Institute of Biodynamics and Biocomplexity, Department of Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Victoria G. Castiglioni
- Division of Developmental Biology, Institute of Biodynamics and Biocomplexity, Department of Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Sander van den Heuvel
- Division of Developmental Biology, Institute of Biodynamics and Biocomplexity, Department of Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Mike Boxem
- Division of Developmental Biology, Institute of Biodynamics and Biocomplexity, Department of Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands
- * E-mail:
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5
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Pedone KH, González-Pérez V, Leopold LE, Rasmussen NR, Der CJ, Cox AD, Ahmed S, Reiner DJ. Engineering threshold-based selection systems. G3 (BETHESDA, MD.) 2021; 11:jkab234. [PMID: 34544135 PMCID: PMC8496214 DOI: 10.1093/g3journal/jkab234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 06/28/2021] [Indexed: 11/12/2022]
Abstract
Using model organisms to identify novel therapeutic targets is frequently constrained by pre-existing genetic toolkits. To expedite positive selection for identification of novel downstream effectors, we engineered conditional expression of activated CED-10/Rac to disrupt Caenorhabditis elegans embryonic morphogenesis, titrated to 100% lethality. The strategy of engineering thresholds for positive selection using experimental animals was validated with pharmacological and genetic suppression and is generalizable to diverse molecular processes and experimental systems.
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Affiliation(s)
- Katherine H Pedone
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Vanessa González-Pérez
- Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Luciana E Leopold
- Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC 27599, USA
- Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Neal R Rasmussen
- Institute of Biosciences and Technology, College of Medicine, Texas A&M Health Science Center, Houston, TX 77030, USA
| | - Channing J Der
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599, USA
- Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC 27599, USA
- Department of Pharmacology, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Adrienne D Cox
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599, USA
- Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC 27599, USA
- Department of Pharmacology, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Shawn Ahmed
- Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC 27599, USA
- Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USA
| | - David J Reiner
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599, USA
- Institute of Biosciences and Technology, College of Medicine, Texas A&M Health Science Center, Houston, TX 77030, USA
- Department of Pharmacology, University of North Carolina, Chapel Hill, NC 27599, USA
- Department of Radiation Oncology, University of North Carolina, Chapel Hill, NC 27599, USA
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6
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Fu R, Jiang X, Huang Z, Zhang H. The spectraplakins of Caenorhabditis elegans : Cytoskeletal crosslinkers and beyond. Semin Cell Dev Biol 2017; 69:58-68. [DOI: 10.1016/j.semcdb.2017.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 06/04/2017] [Accepted: 06/10/2017] [Indexed: 02/07/2023]
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7
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Cecchetelli AD, Cram EJ. Regulating distal tip cell migration in space and time. Mech Dev 2017; 148:11-17. [PMID: 28442366 DOI: 10.1016/j.mod.2017.04.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 01/26/2017] [Accepted: 04/12/2017] [Indexed: 12/16/2022]
Abstract
Gonad morphogenesis in the nematode C. elegans is guided by two leader cells, the distal tip cells (DTC). The DTCs migrate along a stereotyped path, executing two 90° turns before stopping at the midpoint of the animal. This migratory path determines the double-U shape of the adult gonad, therefore, the path taken by the DTCs can be inferred from the final shape of the organ. In this review, we focus on the mechanism by which the DTC executes the first 90° turn from the ventral to dorsal side of the animal, and how it finds its correct stopping place at the midpoint of the animal. We discuss the role of heterochronic genes in coordinating DTC migration with larval development, the role of feedback loops and miRNA regulation in phenotypic robustness, and the role of RNA binding proteins in the cessation of DTC migration.
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Affiliation(s)
- Alyssa D Cecchetelli
- Department of Biology, Northeastern University, 360 Huntington Avenue, 134 Mugar Hall, Boston, MA 02115, United States
| | - Erin J Cram
- Department of Biology, Northeastern University, 360 Huntington Avenue, 134 Mugar Hall, Boston, MA 02115, United States.
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8
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Kidd AR, Muñiz-Medina V, Der CJ, Cox AD, Reiner DJ. The C. elegans Chp/Wrch Ortholog CHW-1 Contributes to LIN-18/Ryk and LIN-17/Frizzled Signaling in Cell Polarity. PLoS One 2015. [PMID: 26208319 PMCID: PMC4514874 DOI: 10.1371/journal.pone.0133226] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Wnt signaling controls various aspects of developmental and cell biology, as well as contributing to certain cancers. Expression of the human Rho family small GTPase Wrch/RhoU is regulated by Wnt signaling, and Wrch and its paralog Chp/RhoV are both implicated in oncogenic transformation and regulation of cytoskeletal dynamics. We performed developmental genetic analysis of the single Caenorhabditis elegans ortholog of Chp and Wrch, CHW-1. Using a transgenic assay of the distal tip cell migration, we found that wild-type CHW-1 is likely to be partially constitutively active and that we can alter ectopic CHW-1-dependent migration phenotypes with mutations predicted to increase or decrease intrinsic GTP hydrolysis rate. The vulval P7.p polarity decision balances multiple antagonistic Wnt signals, and also uses different types of Wnt signaling. Previously described cooperative Wnt receptors LIN-17/Frizzled and LIN-18/Ryk orient P7.p posteriorly, with LIN-17/Fz contributing approximately two-thirds of polarizing activity. CHW-1 deletion appears to equalize the contributions of these two receptors. We hypothesize that CHW-1 increases LIN-17/Fz activity at the expense of LIN-18/Ryk, thus making the contribution of these signals unequal. For P7.p to polarize correctly and form a proper vulva, LIN-17/Fz and LIN-18/Ryk antagonize other Wnt transmembrane systems VANG-1/VanGogh and CAM-1/Ror. Our genetic data suggest that LIN-17/Fz represses both VANG-1/VanGogh and CAM-1/Ror, while LIN-18/Ryk represses only VANG-1. These data expand our knowledge of a sophisticated signaling network to control P7.p polarity, and suggests that CHW-1 can alter ligand gradients or receptor priorities in the system.
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Affiliation(s)
- Ambrose R. Kidd
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - Vanessa Muñiz-Medina
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - Channing J. Der
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, United States of America
- Department of Pharmacology, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - Adrienne D. Cox
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, United States of America
- Department of Pharmacology, University of North Carolina, Chapel Hill, North Carolina, United States of America
- Department of Radiation Oncology, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - David J. Reiner
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, United States of America
- Department of Pharmacology, University of North Carolina, Chapel Hill, North Carolina, United States of America
- Center for Translational Cancer Research, Institute of Biosciences and Technology, Texas A&M Health Science Center and College of Medicine, Houston, Texas, 77030, United States of America
- * E-mail:
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9
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Meighan CM, Kelly VE, Krahe EC, Gaeta AJ. α integrin cytoplasmic tails can rescue the loss of Rho-family GTPase signaling in the C. elegans somatic gonad. Mech Dev 2015; 136:111-22. [PMID: 25576691 DOI: 10.1016/j.mod.2014.12.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 12/02/2014] [Accepted: 12/30/2014] [Indexed: 10/24/2022]
Abstract
Integrin signaling relies on multiple, distinct pathways to impact a diverse set of cell behaviors. The Rho family of GTPases are well-established downstream signaling partners of integrins that regulate cell shape, polarity, and migration. The nematode C. elegans provides a simple in vivo system for studying both integrins and the Rho family. Our previous work showed that the C. elegans α integrin cytoplasmic tails have tissue-specific functions during development. Here, we use chimeric α integrins to show that the cytoplasmic tails can rescue the loss of the Rho family of GTPases in three cell types in the somatic gonad. Knockdown of rho-1 by RNAi causes defects in sheath cell actin organization, ovulation, and vulva morphology. Chimeric α integrin ina-1 with the pat-2 cytoplasmic tail can rescue both actin organization and ovulation after rho-1 RNAi, yet cannot restore vulva morphology. Knockdown of cdc-42 by RNAi causes defects in sheath cell actin organization, ovulation, vulva morphology, and distal tip cell migration. Chimeric α integrin pat-2 with the ina-1 cytoplasmic tail can rescue vulva morphology defects and distal tip cell migration after cdc-42 RNAi, yet cannot restore sheath cell actin organization or ovulation. Disruption of Rac yields the same phenotype in distal tip cells regardless of α integrin cytoplasmic tail composition. Taken together, the cytoplasmic tails of α integrins can bypass signaling from members of the Rho family of GTPases during development.
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Affiliation(s)
| | - Victoria E Kelly
- Christopher Newport University, Newport News, VA 23606, United States
| | - Elena C Krahe
- Christopher Newport University, Newport News, VA 23606, United States
| | - Adriel J Gaeta
- Christopher Newport University, Newport News, VA 23606, United States
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10
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The BED finger domain protein MIG-39 halts migration of distal tip cells in Caenorhabditis elegans. Dev Biol 2014; 397:151-61. [PMID: 25446539 DOI: 10.1016/j.ydbio.2014.10.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 10/08/2014] [Accepted: 10/14/2014] [Indexed: 11/21/2022]
Abstract
Organs are often formed by the extension and branching of epithelial tubes. An appropriate termination of epithelial tube extension is important for generating organs of the proper size and morphology. However, the mechanism by which epithelial tubes terminate their extension is mostly unknown. Here we show that the BED-finger domain protein MIG-39 acts to stop epithelial tube extension in Caenorhabditis elegans. The gonadal leader cells, called distal tip cells (DTCs), migrate in a U-shaped pattern during larval development and stop migrating at the young adult stage, generating a gonad with anterior and posterior U-shaped arms. In mig-39 mutants, however, DTCs overshot their normal stopping position. MIG-39 promoted the deceleration of DTCs, leading to the proper timing and positioning of the cessation of DTC migration. Among three Rac GTPase genes, mutations in ced-10 and rac-2 enhanced the overshoot of anterior DTCs, while they suppressed that of posterior DTCs of mig-39 mutants. On the other hand, the mutation in mig-2 suppressed both the anterior and posterior DTC defects of mig-39. Genetic analyses suggested that MIG-39 acts in parallel with Rac GTPases in stopping DTC migration. We propose a model in which the anterior and posterior DTCs respond in an opposite manner to the levels of Rac activities in the cessation of DTC migration.
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11
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Martin E, Harel S, Nkengfac B, Hamiche K, Neault M, Jenna S. pix-1 controls early elongation in parallel with mel-11 and let-502 in Caenorhabditis elegans. PLoS One 2014; 9:e94684. [PMID: 24732978 PMCID: PMC3986101 DOI: 10.1371/journal.pone.0094684] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 03/17/2014] [Indexed: 12/17/2022] Open
Abstract
Cell shape changes are crucial for metazoan development. During Caenorhabditis elegans embryogenesis, epidermal cell shape changes transform ovoid embryos into vermiform larvae. This process is divided into two phases: early and late elongation. Early elongation involves the contraction of filamentous actin bundles by phosphorylated non-muscle myosin in a subset of epidermal (hypodermal) cells. The genes controlling early elongation are associated with two parallel pathways. The first one involves the rho-1/RHOA-specific effector let-502/Rho-kinase and mel-11/myosin phosphatase regulatory subunit. The second pathway involves the CDC42/RAC-specific effector pak-1. Late elongation is driven by mechanotransduction in ventral and dorsal hypodermal cells in response to body-wall muscle contractions, and involves the CDC42/RAC-specific Guanine-nucleotide Exchange Factor (GEF) pix-1, the GTPase ced-10/RAC and pak-1. In this study, pix-1 is shown to control early elongation in parallel with let-502/mel-11, as previously shown for pak-1. We show that pix-1, pak-1 and let-502 control the rate of elongation, and the antero-posterior morphology of the embryos. In particular, pix-1 and pak-1 are shown to control head, but not tail width, while let-502 controls both head and tail width. This suggests that let-502 function is required throughout the antero-posterior axis of the embryo during early elongation, while pix-1/pak-1 function may be mostly required in the anterior part of the embryo. Supporting this hypothesis we show that low pix-1 expression level in the dorsal-posterior hypodermal cells is required to ensure high elongation rate during early elongation.
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Affiliation(s)
- Emmanuel Martin
- Department of Chemistry, Pharmaqam, Biomed, Université du Québec à Montréal (UQÀM), Montréal, Québec, Canada
| | - Sharon Harel
- Department of Chemistry, Pharmaqam, Biomed, Université du Québec à Montréal (UQÀM), Montréal, Québec, Canada
| | - Bernard Nkengfac
- Department of Chemistry, Pharmaqam, Biomed, Université du Québec à Montréal (UQÀM), Montréal, Québec, Canada
| | - Karim Hamiche
- Department of Chemistry, Pharmaqam, Biomed, Université du Québec à Montréal (UQÀM), Montréal, Québec, Canada
| | - Mathieu Neault
- Department of Chemistry, Pharmaqam, Biomed, Université du Québec à Montréal (UQÀM), Montréal, Québec, Canada
| | - Sarah Jenna
- Department of Chemistry, Pharmaqam, Biomed, Université du Québec à Montréal (UQÀM), Montréal, Québec, Canada
- * E-mail:
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12
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A DTC niche plexus surrounds the germline stem cell pool in Caenorhabditis elegans. PLoS One 2014; 9:e88372. [PMID: 24586318 PMCID: PMC3929564 DOI: 10.1371/journal.pone.0088372] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 01/11/2014] [Indexed: 01/13/2023] Open
Abstract
The mesenchymal distal tip cell (DTC) provides the niche for Caenorhabditis elegans germline stem cells (GSCs). The DTC has a complex cellular architecture: its cell body caps the distal gonadal end and contacts germ cells extensively, but it also includes multiple cellular processes that extend along the germline tube and intercalate between germ cells. Here we use the lag-2 DTC promoter to drive expression of myristoylated GFP, which highlights DTC membranes and permits a more detailed view of DTC architecture. We find that short processes intercalating between germ cells contact more germ cells than seen previously. We define this region of extensive niche contact with germ cells as the DTC plexus. The extent of the DTC plexus corresponds well with the previously determined extent of the GSC pool. Moreover, expression of a differentiation marker increases as germ cells move out of the plexus. Maintenance of this DTC plexus depends on the presence of undifferentiated germ cells, suggesting that germ cell state can influence niche architecture. The roles of this DTC architecture remain an open question. One idea is that the DTC plexus delivers Notch signaling to the cluster of germ cells comprising the GSC pool; another idea is that the plexus anchors GSCs at the distal end.
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13
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Kennedy LM, Pham SCDL, Grishok A. Nonautonomous regulation of neuronal migration by insulin signaling, DAF-16/FOXO, and PAK-1. Cell Rep 2013; 4:996-1009. [PMID: 23994474 DOI: 10.1016/j.celrep.2013.07.045] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 07/02/2013] [Accepted: 07/30/2013] [Indexed: 01/29/2023] Open
Abstract
Neuronal migration is essential for nervous system development in all organisms and is regulated in the nematode, C. elegans, by signaling pathways that are conserved in humans. Here, we demonstrate that the insulin/IGF-1-PI3K signaling pathway modulates the activity of the DAF-16/FOXO transcription factor to regulate the anterior migrations of the hermaphrodite-specific neurons (HSNs) during embryogenesis of C. elegans. When signaling is reduced, DAF-16 is activated and promotes migration; conversely, when signaling is enhanced, DAF-16 is inactivated, and migration is inhibited. We show that DAF-16 acts nonautonomously in the hypodermis to promote HSN migration. Furthermore, we identify PAK-1, a p21-activated kinase, as a downstream mediator of insulin/IGF-1-DAF-16 signaling in the nonautonomous control of HSN migration. Because a FOXO-Pak1 pathway was recently shown to regulate mammalian neuronal polarity, our findings indicate that the roles of FOXO and Pak1 in neuronal migration are most likely conserved from C. elegans to higher organisms.
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Affiliation(s)
- Lisa M Kennedy
- Department of Genetics and Development, Columbia University, New York, NY 10032, USA
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