51
|
Córdoba S, Requena D, Jory A, Saiz A, Estella C. The evolutionary conserved transcription factor Sp1 controls appendage growth through Notch signaling. Development 2016; 143:3623-3631. [DOI: 10.1242/dev.138735] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 08/12/2016] [Indexed: 12/25/2022]
Abstract
The appendages of arthropods and vertebrates are not homologous structures, although the underlying genetic mechanisms that pattern them are highly conserved. Members of the Sp family of transcription factors are expressed in the developing limbs and their function is required for limb growth in both insects and chordates. Despite the fundamental and conserved role that these transcription factors play during appendage development, their target genes and the mechanisms in which they participate to control limb growth are mostly unknown. We analyzed here the individual contributions of two Drosophila Sp members, buttonhead (btd) and Sp1, during leg development. We show that Sp1 plays a more prominent role controlling leg growth than btd. We identified a regulatory function of Sp1 in Notch signaling, and performed a genome wide transcriptome analysis to identify other potential Sp1 target genes contributing to leg growth. Our data suggest a mechanism by which the Sp factors control appendage growth through the Notch signaling.
Collapse
Affiliation(s)
- Sergio Córdoba
- Departamento de Biología Molecular and Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid (UAM), Nicolás Cabrera 1, 28049 Madrid, Spain
| | - David Requena
- Departamento de Biología Molecular and Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid (UAM), Nicolás Cabrera 1, 28049 Madrid, Spain
| | - Aurelie Jory
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York, United States of America
| | - Almudena Saiz
- Departamento de Biología Molecular and Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid (UAM), Nicolás Cabrera 1, 28049 Madrid, Spain
| | - Carlos Estella
- Departamento de Biología Molecular and Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid (UAM), Nicolás Cabrera 1, 28049 Madrid, Spain
| |
Collapse
|
52
|
Schock EN, Chang CF, Youngworth IA, Davey MG, Delany ME, Brugmann SA. Utilizing the chicken as an animal model for human craniofacial ciliopathies. Dev Biol 2015; 415:326-337. [PMID: 26597494 DOI: 10.1016/j.ydbio.2015.10.024] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 10/13/2015] [Accepted: 10/21/2015] [Indexed: 11/30/2022]
Abstract
The chicken has been a particularly useful model for the study of craniofacial development and disease for over a century due to their relatively large size, accessibility, and amenability for classical bead implantation and transplant experiments. Several naturally occurring mutant lines with craniofacial anomalies also exist and have been heavily utilized by developmental biologist for several decades. Two of the most well known lines, talpid(2) (ta(2)) and talpid(3) (ta(3)), represent the first spontaneous mutants to have the causative genes identified. Despite having distinct genetic causes, both mutants have recently been identified as ciliopathic. Excitingly, both of these mutants have been classified as models for human craniofacial ciliopathies: Oral-facial-digital syndrome (ta(2)) and Joubert syndrome (ta(3)). Herein, we review and compare these two models of craniofacial disease and highlight what they have revealed about the molecular and cellular etiology of ciliopathies. Furthermore, we outline how applying classical avian experiments and new technological advances (transgenics and genome editing) with naturally occurring avian mutants can add a tremendous amount to what we currently know about craniofacial ciliopathies.
Collapse
Affiliation(s)
- Elizabeth N Schock
- Division of Plastic Surgery, Department of Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA; Division of Developmental Biology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Ching-Fang Chang
- Division of Plastic Surgery, Department of Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA; Division of Developmental Biology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Ingrid A Youngworth
- College of Agricultural and Environmental Sciences, Department of Animal Science, University of California Davis, Davis, CA 95616, USA
| | - Megan G Davey
- Division of Developmental Biology, The Roslin Institute and R(D)SVS, University of Edinburgh, Midlothian, UK
| | - Mary E Delany
- College of Agricultural and Environmental Sciences, Department of Animal Science, University of California Davis, Davis, CA 95616, USA
| | - Samantha A Brugmann
- Division of Plastic Surgery, Department of Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA; Division of Developmental Biology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
| |
Collapse
|
53
|
Pelosi E, Forabosco A, Schlessinger D. Genetics of the ovarian reserve. Front Genet 2015; 6:308. [PMID: 26528328 PMCID: PMC4606124 DOI: 10.3389/fgene.2015.00308] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 09/24/2015] [Indexed: 11/13/2022] Open
Abstract
Primordial follicles or non-growing follicles (NGFs) are the functional unit of reproduction, each comprising a single germ cell surrounded by supporting somatic cells. NGFs constitute the ovarian reserve (OR), prerequisite for germ cell ovulation and the continuation of the species. The dynamics of the reserve is determined by the number of NGFs formed and their complex subsequent fates. During the reproductive lifespan, the OR progressively diminishes due to follicle atresia as well as recruitment, maturation, and ovulation. The depletion of the OR is the major determining driver of menopause, which ensues when the number of primordial follicles falls below a threshold of ∼1,000. Therefore, genes and processes involved in follicle dynamics are particularly important to understand the process of menopause, both in the typical reproductive lifespan and in conditions like primary ovarian insufficiency, defined as menopause before age 40. Genes and their variants that affect the timing of menopause thereby provide candidates for diagnosis of and intervention in problems of reproductive lifespan. We review the current knowledge of processes and genes involved in the development of the OR and in the dynamics of ovarian follicles.
Collapse
Affiliation(s)
- Emanuele Pelosi
- Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | | | - David Schlessinger
- Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| |
Collapse
|
54
|
Abstract
Palatogenesis involves the initiation, growth, morphogenesis, and fusion of the primary and secondary palatal shelves from initially separate facial prominences during embryogenesis to form the intact palate separating the oral cavity from the nostrils. The palatal shelves consist mainly of cranial neural crest-derived mesenchymal cells covered by a simple embryonic epithelium. The growth and patterning of the palatal shelves are controlled by reciprocal epithelial-mesenchymal interactions regulated by multiple signaling pathways and transcription factors. During palatal shelf outgrowth, the embryonic epithelium develops a "teflon" coat consisting of a single, continuous layer of periderm cells that prevents the facial prominences and palatal shelves from forming aberrant interepithelial adhesions. Palatal fusion involves not only spatiotemporally regulated disruption of the periderm but also dynamic cellular and molecular processes that result in adhesion and intercalation of the palatal medial edge epithelia to form an intershelf epithelial seam, and subsequent dissolution of the epithelial seam to form the intact roof of the oral cavity. The complexity of regulation of these morphogenetic processes is reflected by the common occurrence of cleft palate in humans. This review will summarize major recent advances and discuss major remaining gaps in the understanding of cellular and molecular mechanisms controlling palatogenesis.
Collapse
Affiliation(s)
- Yu Lan
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA; Division of Plastic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
| | - Jingyue Xu
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Rulang Jiang
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA; Division of Plastic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
| |
Collapse
|
55
|
Farr JN, Roforth MM, Fujita K, Nicks KM, Cunningham JM, Atkinson EJ, Therneau TM, McCready LK, Peterson JM, Drake MT, Monroe DG, Khosla S. Effects of Age and Estrogen on Skeletal Gene Expression in Humans as Assessed by RNA Sequencing. PLoS One 2015; 10:e0138347. [PMID: 26402159 PMCID: PMC4581624 DOI: 10.1371/journal.pone.0138347] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 08/26/2015] [Indexed: 01/19/2023] Open
Abstract
UNLABELLED Precise delineation of the specific genes and pathways altered with aging and estrogen (E) therapy may lead to new skeletal biomarkers and the development of novel bone therapeutics. Previous human bone studies, however, have been limited by only examining pre-specified genes and pathways. High-throughput RNA sequencing (RNAseq), on the other hand, offers an unbiased approach to examine the entire transcriptome. Here we present an RNAseq analysis of human bone samples, obtained from iliac crest needle biopsies, to yield the first in vivo interrogation of all genes and pathways that may be altered in bone with aging and E therapy in humans. 58 healthy women were studied, including 19 young women (mean age ± SD, 30.3 ± 5.4 years), 19 old women (73.1 ± 6.6 years), and 20 old women treated with 3 weeks of E therapy (70.5 ± 5.2 years). Using generally accepted criteria (false discovery rate [q] < 0.10), aging altered a total of 678 genes and 12 pathways, including a subset known to regulate bone metabolism (e.g., Notch). Interestingly, the LEF1 transcription factor, which is a classical downstream target of the Wnt/β-catenin signaling pathway, was significantly downregulated in the bones from the old versus young women; consistent with this, LEF1 binding sites were significantly enriched in the promoter regions of the differentially expressed genes in the old versus young women, suggesting that aging was associated with alterations in Wnt signaling in bone. Further, of the 21 unique genes altered in bone by E therapy, the expression of INHBB (encoding for the inhibin, beta B polypeptide), which decreased with aging (by 0.6-fold), was restored to young adult levels in response to E therapy. In conclusion, our data demonstrate that aging alters a substantial portion of the skeletal transcriptome, whereas E therapy appears to have significant, albeit less wide-ranging effects. These data provide a valuable resource for the potential identification of novel biomarkers associated with age-related bone loss and also highlight potential pathways that could be targeted to treat osteoporosis. TRIAL REGISTRATION ClinicalTrials.gov NCT02349113.
Collapse
Affiliation(s)
- Joshua N. Farr
- Division of Endocrinology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
- Robert and Arlene Kogod Center on Aging, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - Matthew M. Roforth
- Division of Endocrinology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
- Robert and Arlene Kogod Center on Aging, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - Koji Fujita
- Division of Endocrinology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
- Robert and Arlene Kogod Center on Aging, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - Kristy M. Nicks
- Division of Endocrinology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
- Robert and Arlene Kogod Center on Aging, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - Julie M. Cunningham
- Department of Experimental Pathology and Laboratory Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - Elizabeth J. Atkinson
- Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - Terry M. Therneau
- Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - Louise K. McCready
- Division of Endocrinology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - James M. Peterson
- Division of Endocrinology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - Matthew T. Drake
- Division of Endocrinology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
- Robert and Arlene Kogod Center on Aging, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - David G. Monroe
- Division of Endocrinology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
- Robert and Arlene Kogod Center on Aging, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
| | - Sundeep Khosla
- Division of Endocrinology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
- Robert and Arlene Kogod Center on Aging, Mayo Clinic College of Medicine, Rochester, MN, 55905, United States of America
- * E-mail:
| |
Collapse
|
56
|
Zengin T, Ekinci B, Kucukkose C, Yalcin-Ozuysal O. IRF6 Is Involved in the Regulation of Cell Proliferation and Transformation in MCF10A Cells Downstream of Notch Signaling. PLoS One 2015; 10:e0132757. [PMID: 26161746 PMCID: PMC4498616 DOI: 10.1371/journal.pone.0132757] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 06/17/2015] [Indexed: 12/22/2022] Open
Abstract
IRF6, a member of Interferon Regulatory Factors (IRF) family, is involved in orofacial and epidermal development. In breast cancer cell lines ectopic expression of IRF6 reduces cell numbers suggesting a role as negative regulator of cell cycle. IRF6 is a direct target of canonical Notch signaling in keratinocyte differentiation. Notch is involved in luminal cell fate determination and stem cell regulation in the normal breast and is implicated as an oncogene in breast cancer. Notch activation is sufficient to induce proliferation and transformation in non-tumorigenic breast epithelial cell line, MCF10A. ΔNp63, which is downregulated by Notch activation in the breast, regulates IRF6 expression in keratinocytes. In this report, we investigate Notch-IRF6 and ΔNp63-IRF6 interactions in MCF10A and MDA MB 231 cells. We observed that in these cells, IRF6 expression is partially regulated by canonical Notch signaling and ΔNp63 downregulation. Furthermore, we demonstrate that IRF6 abrogation impairs Notch-induced proliferation and transformation in MCF10A cells. Thus, we confirm the previous findings by showing a tissue independent regulation of IRF6 by Notch signaling, and extend them by proposing a context dependent role for IRF6, which acts as a positive regulator of proliferation and transformation in MCF10A cells downstream of Notch signaling.
Collapse
Affiliation(s)
- Talip Zengin
- Department of Molecular Biology and Genetic, Izmir Institute of Technology, Izmir, Turkey
| | - Burcu Ekinci
- Department of Molecular Biology and Genetic, Izmir Institute of Technology, Izmir, Turkey
| | - Cansu Kucukkose
- Department of Molecular Biology and Genetic, Izmir Institute of Technology, Izmir, Turkey
| | - Ozden Yalcin-Ozuysal
- Department of Molecular Biology and Genetic, Izmir Institute of Technology, Izmir, Turkey
- * E-mail:
| |
Collapse
|
57
|
Ghazali N, Rahman NA, Kannan TP, Jaafar S. Screening of Transforming Growth Factor Beta 3 and Jagged2 Genes in the Malay Population with Nonsyndromic Cleft Lip with or without Cleft Palate. Cleft Palate Craniofac J 2015; 52:e88-94. [DOI: 10.1597/14-024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Objective To determine the prevalence of mutations in transforming growth factor beta 3 (TGFβ3) and Jagged2 genes and their association with nonsyndromic cleft lip with or without cleft palate (CL±P) patients. Design Cross-sectional study on nonsyndromic CL±P and noncleft patients. Setting Reconstructive clinic and outpatient dental clinic, Hospital Universiti Sains Malaysia. Patients Blood samples of 96 nonsyndromic CL±P and 96 noncleft subjects. Main Outcome Measure Prevalence and association of mutations in TGFβ3 and Jagged2 genes with nonsyndromic CL±P. Results Most of the nonsyndromic CL±P patients (53.1%) had left unilateral CLP. There were slightly more females (56.6%) compared with males. The prevalence of the mutations in the TGFβ3 gene was 17.7% (95% confidence interval [CI]: 9.5, 24.5) and in the Jagged2 gene was 12.5% (95% CI: 5.5, 18.5), which was higher compared with the noncleft group. For the TGFβ3 gene, there was no mutation in the coding region in either of the groups. All variants were single nucleotide polymorphisms located within the intronic flanking region. Two variants were identified (g.15812T>G and g.15966A>G) in both nonsyndromic CL±P and noncleft patients. However, the association was not significant ( P > .05). Three variants (g.19779C>T, g.19547G>A, and g.19712C>T) were identified in the Jagged2 gene among nonsyndromic CL±P and noncleft patients. Only g.19712C>T showed a significant association with nonsyndromic CL±P patients ( P = .039). Conclusion g.19712C>T might play a crucial role in the development of cleft lip and palate. To the best of our knowledge, this is the first report of the mutation found within intron 13 of the Jagged2 gene among nonsyndromic CL±P Malay patients.
Collapse
Affiliation(s)
- Norliana Ghazali
- Dental Public Health Unit, Universiti Sains Malaysia, Kelantan, Malaysia
| | | | | | - Saidi Jaafar
- Molecular Biology Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia
| |
Collapse
|
58
|
Southgate L, Sukalo M, Karountzos ASV, Taylor EJ, Collinson CS, Ruddy D, Snape KM, Dallapiccola B, Tolmie JL, Joss S, Brancati F, Digilio MC, Graul-Neumann LM, Salviati L, Coerdt W, Jacquemin E, Wuyts W, Zenker M, Machado RD, Trembath RC. Haploinsufficiency of the NOTCH1 Receptor as a Cause of Adams-Oliver Syndrome With Variable Cardiac Anomalies. ACTA ACUST UNITED AC 2015; 8:572-581. [PMID: 25963545 DOI: 10.1161/circgenetics.115.001086] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Accepted: 05/01/2015] [Indexed: 01/17/2023]
Abstract
BACKGROUND Adams-Oliver syndrome (AOS) is a rare disorder characterized by congenital limb defects and scalp cutis aplasia. In a proportion of cases, notable cardiac involvement is also apparent. Despite recent advances in the understanding of the genetic basis of AOS, for the majority of affected subjects, the underlying molecular defect remains unresolved. This study aimed to identify novel genetic determinants of AOS. METHODS AND RESULTS Whole-exome sequencing was performed for 12 probands, each with a clinical diagnosis of AOS. Analyses led to the identification of novel heterozygous truncating NOTCH1 mutations (c.1649dupA and c.6049_6050delTC) in 2 kindreds in which AOS was segregating as an autosomal dominant trait. Screening a cohort of 52 unrelated AOS subjects, we detected 8 additional unique NOTCH1 mutations, including 3 de novo amino acid substitutions, all within the ligand-binding domain. Congenital heart anomalies were noted in 47% (8/17) of NOTCH1-positive probands and affected family members. In leukocyte-derived RNA from subjects harboring NOTCH1 extracellular domain mutations, we observed significant reduction of NOTCH1 expression, suggesting instability and degradation of mutant mRNA transcripts by the cellular machinery. Transient transfection of mutagenized NOTCH1 missense constructs also revealed significant reduction in gene expression. Mutant NOTCH1 expression was associated with downregulation of the Notch target genes HEY1 and HES1, indicating that NOTCH1-related AOS arises through dysregulation of the Notch signaling pathway. CONCLUSIONS These findings highlight a key role for NOTCH1 across a range of developmental anomalies that include cardiac defects and implicate NOTCH1 haploinsufficiency as a likely molecular mechanism for this group of disorders.
Collapse
Affiliation(s)
- Laura Southgate
- Division of Genetics & Molecular Medicine, King's College London, Faculty of Life Sciences & Medicine, Guy's Hospital, London, United Kingdom.,Barts & The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom
| | - Maja Sukalo
- Institute of Human Genetics, Otto-von-Guericke-Universität Magdeburg, University Hospital Magdeburg, Magdeburg, Germany
| | | | - Edward J Taylor
- School of Life Sciences, University of Lincoln, Lincoln, United Kingdom
| | - Claire S Collinson
- Division of Genetics & Molecular Medicine, King's College London, Faculty of Life Sciences & Medicine, Guy's Hospital, London, United Kingdom
| | - Deborah Ruddy
- Department of Clinical Genetics, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - Katie M Snape
- Department of Clinical Genetics, South West Thames Regional Genetics Service, St George's Healthcare NHS Trust, London, United Kingdom
| | - Bruno Dallapiccola
- Scientific Directorate, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - John L Tolmie
- South West of Scotland Clinical Genetics Service, Southern General Hospital, Glasgow, United Kingdom
| | - Shelagh Joss
- South West of Scotland Clinical Genetics Service, Southern General Hospital, Glasgow, United Kingdom
| | - Francesco Brancati
- Department of Medical, Oral & Biotechnological Sciences, Gabriele d'Annunzio University of Chieti-Pescara, Chieti, Italy
| | | | | | - Leonardo Salviati
- Clinical Genetics Unit, Department of Woman & Child Health, University of Padova, Padova, Italy
| | - Wiltrud Coerdt
- Institute of Human Genetics, Mainz University Medical Center, Mainz, Germany
| | - Emmanuel Jacquemin
- Pediatric Hepatology & Liver Transplantation Unit, Bicêtre Hospital, Assistance Publique - Hôpitaux de Paris, Hepatinov, Le Kremlin Bicêtre, France.,Inserm U1174, University Paris-Sud 11, Orsay, France
| | - Wim Wuyts
- Department of Medical Genetics, University & University Hospital of Antwerp, Edegem, Belgium
| | - Martin Zenker
- Institute of Human Genetics, Otto-von-Guericke-Universität Magdeburg, University Hospital Magdeburg, Magdeburg, Germany
| | - Rajiv D Machado
- School of Life Sciences, University of Lincoln, Lincoln, United Kingdom
| | - Richard C Trembath
- Barts & The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom.,Department of Clinical Genetics, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| |
Collapse
|
59
|
Combined QTL and selective sweep mappings with coding SNP annotation and cis-eQTL analysis revealed PARK2 and JAG2 as new candidate genes for adiposity regulation. G3-GENES GENOMES GENETICS 2015; 5:517-29. [PMID: 25653314 PMCID: PMC4390568 DOI: 10.1534/g3.115.016865] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Very few causal genes have been identified by quantitative trait loci (QTL) mapping because of the large size of QTL, and most of them were identified thanks to functional links already known with the targeted phenotype. Here, we propose to combine selection signature detection, coding SNP annotation, and cis-expression QTL analyses to identify potential causal genes underlying QTL identified in divergent line designs. As a model, we chose experimental chicken lines divergently selected for only one trait, the abdominal fat weight, in which several QTL were previously mapped. Using new haplotype-based statistics exploiting the very high SNP density generated through whole-genome resequencing, we found 129 significant selective sweeps. Most of the QTL colocalized with at least one sweep, which markedly narrowed candidate region size. Some of those sweeps contained only one gene, therefore making them strong positional causal candidates with no presupposed function. We then focused on two of these QTL/sweeps. The absence of nonsynonymous SNPs in their coding regions strongly suggests the existence of causal mutations acting in cis on their expression, confirmed by cis-eQTL identification using either allele-specific expression or genetic mapping analyses. Additional expression analyses of those two genes in the chicken and mice contrasted for adiposity reinforces their link with this phenotype. This study shows for the first time the interest of combining selective sweeps mapping, coding SNP annotation and cis-eQTL analyses for identifying causative genes for a complex trait, in the context of divergent lines selected for this specific trait. Moreover, it highlights two genes, JAG2 and PARK2, as new potential negative and positive key regulators of adiposity in chicken and mice.
Collapse
|
60
|
Zhang C, Ge X, Liu Q, Jiang M, Li MW, Li H. MicroRNA-mediated non-cell-autonomous regulation of cortical radial glial transformation revealed by a Dicer1 knockout mouse model. Glia 2015; 63:860-76. [PMID: 25643827 DOI: 10.1002/glia.22789] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 12/23/2014] [Indexed: 11/09/2022]
Abstract
Radial glia (RG), as neurogenic progenitors and neuronal migration scaffolds, play critical roles during cortical neurogenesis. RG transformation into astrocytes, marking the transition from developmental to physiological function of these cells, is an important step during cortical development. In this study, we aim to determine the roles of microRNAs (miRNAs) during this biological process. In a conditional Dicer1-null mouse where Dicer1 is deleted in both RG and their neuronal progeny, we observe delayed RG transformation as revealed by the persistence of their radial processes, and reduced number and complexity of translocated RG cell bodies in the postnatal cerebral cortex. Downregulation of Notch1 signaling is crucial to RG transformation, and consistently we find that Notch1 signaling is enhanced in the Dicer1-null cerebral cortex. In addition, we show that, among the Notch1 ligands, Jagged2 (Jag2) is preferentially upregulated in the postnatal Dicer1-null cerebral cortex as well as primary embryonic cortical cultures with instant Dicer1 deletion. Functionally, Dicer1-deleted postnatal cerebellar cells with elevated Jag2 expression stimulate a stronger Notch1 signaling in a RG clone L2.3 when co-cultured than control cells. Therefore, we unravel a novel non-cell-autonomous mechanism that regulates RG transformation by modulating Notch1 signaling via miRNA-mediated suppression of the Nocth1 ligand Jag2. Furthermore, we validate Jag2 as a miR-124 target gene and demonstrate in vitro that Jag2 expression is highly sensitive to Dicer1 deletion. Finally, we propose a new concept of MiRNA-Sensitive target genes, identification of which may unravel a unique mode of miRNA-mediated gene expression regulation.
Collapse
Affiliation(s)
- Chi Zhang
- West China Developmental & Stem Cell Institute, Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, People's Republic of China
| | | | | | | | | | | |
Collapse
|
61
|
Biggs LC, Goudy SL, Dunnwald M. Palatogenesis and cutaneous repair: A two-headed coin. Dev Dyn 2014; 244:289-310. [PMID: 25370680 DOI: 10.1002/dvdy.24224] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 10/14/2014] [Accepted: 10/27/2014] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND The reparative mechanism that operates following post-natal cutaneous injury is a fundamental survival function that requires a well-orchestrated series of molecular and cellular events. At the end, the body will have closed the hole using processes like cellular proliferation, migration, differentiation and fusion. RESULTS These processes are similar to those occurring during embryogenesis and tissue morphogenesis. Palatogenesis, the formation of the palate from two independent palatal shelves growing towards each other and fusing, intuitively, shares many similarities with the closure of a cutaneous wound from the two migrating epithelial fronts. CONCLUSIONS In this review, we summarize the current information on cutaneous development, wound healing, palatogenesis and orofacial clefting and propose that orofacial clefting and wound healing are conserved processes that share common pathways and gene regulatory networks.
Collapse
Affiliation(s)
- Leah C Biggs
- Department of Pediatrics, Carver College of Medicine, The University of Iowa, Iowa City, Iowa
| | | | | |
Collapse
|
62
|
Deciphering TGF-β3 function in medial edge epithelium specification and fusion during mouse secondary palate development. Dev Dyn 2014; 243:1536-43. [DOI: 10.1002/dvdy.24177] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 07/14/2014] [Accepted: 07/31/2014] [Indexed: 01/16/2023] Open
|
63
|
Schatz O, Langer E, Ben-Arie N. Gene dosage of the transcription factor Fingerin (bHLHA9) affects digit development and links syndactyly to ectrodactyly. Hum Mol Genet 2014; 23:5394-401. [PMID: 24852374 DOI: 10.1093/hmg/ddu257] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Distal limb deformities are congenital malformations with phenotypic variability, genetic heterogeneity and complex inheritance. Among these, split-hand/foot malformation is an ectrodactyly with missing central fingers, yielding a lobster claw-like hand, which when combined with long-bone deficiency is defined as split-hand/foot malformation and long-bone deficiency (SHFLD) that is genetically heterogeneous. Copy number variation (CNV) consisting of 17p13.3 duplication was identified in unrelated pedigrees, underlying SHFLD3 (OMIM 612576). Although the transcription factor Fingerin (bHLHA9) is the only complete gene in the critical region, its biological role is not yet known and there are no data supporting its involvement in mammalian limb development. We have generated knockout mice in which only the entire coding region of Fingerin was deleted, and indeed found that most null mice display some limb defects. These include various levels of simple asymmetrical syndactyly, characterized by webbed fingers, generated by incomplete separation of soft, but not skeletal, tissues between forelimb digits 2 and 3. As expected, hand pads of Fingerin null embryos exhibited reduced apoptosis between digital rays 2 and 3. This defect was shown to cause syndactyly when the same limbs were grown ex vivo following the apoptosis assay. Extrapolating from mouse data, we suggest that Fingerin loss-of-function in humans may underlie MSSD syndactyly (OMIM 609432), which was mapped to the same locus. Taken together, Fingerin gene dosage links two different congenital limb malformations, syndactyly and ectrodactyly, which were previously postulated to share a common etiology. These results add limb disorders to the growing list of diseases resulting from CNV.
Collapse
Affiliation(s)
- Omri Schatz
- Department of Cell and Developmental Biology, Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Erez Langer
- Department of Cell and Developmental Biology, Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Nissim Ben-Arie
- Department of Cell and Developmental Biology, Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| |
Collapse
|
64
|
ZHANG JUNLI, TU KANGSHENG, YANG WEI, LI CHAO, YAO YINGMIN, ZHENG XIN, LIU QINGGUANG. Evaluation of Jagged2 and Gli1 expression and their correlation with prognosis in human hepatocellular carcinoma. Mol Med Rep 2014; 10:749-54. [DOI: 10.3892/mmr.2014.2246] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2013] [Accepted: 04/16/2014] [Indexed: 11/06/2022] Open
|
65
|
Okano J, Udagawa J, Shiota K. Roles of retinoic acid signaling in normal and abnormal development of the palate and tongue. Congenit Anom (Kyoto) 2014; 54:69-76. [PMID: 24666225 DOI: 10.1111/cga.12049] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 12/26/2013] [Indexed: 02/02/2023]
Abstract
Palatogenesis involves various developmental events such as growth, elevation, elongation and fusion of opposing palatal shelves. Extrinsic factors such as mouth opening and subsequent tongue withdrawal are also needed for the horizontal elevation of palate shelves. Failure of any of these steps can lead to cleft palate, one of the most common birth defects in humans. It has been shown that retinoic acid (RA) plays important roles during palate development, but excess RA causes cleft palate in fetuses of both rodents and humans. Thus, the coordinated regulation of retinoid metabolism is essential for normal palatogenesis. The endogenous RA level is determined by the balance of RA-synthesizing (retinaldehyde dehydrogenases: RALDHs) and RA-degrading enzymes (CYP26s). Cyp26b1 is a key player in normal palatogenesis. In this review, we discuss recent progress in the study of the pathogenesis of RA-induced cleft palate, with special reference to the regulation of endogenous RA levels by RA-degrading enzymes.
Collapse
Affiliation(s)
- Junko Okano
- Department of Anatomy and Cell Biology, Shiga University of Medical Science, Otsu
| | | | | |
Collapse
|
66
|
Thymic epithelial cell development and its dysfunction in human diseases. BIOMED RESEARCH INTERNATIONAL 2014; 2014:206929. [PMID: 24672784 PMCID: PMC3929497 DOI: 10.1155/2014/206929] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 11/28/2013] [Indexed: 12/01/2022]
Abstract
Thymic epithelial cells (TECs) are the key components in thymic microenvironment for T cells development. TECs, composed of cortical and medullary TECs, are derived from a common bipotent progenitor and undergo a stepwise development controlled by multiple levels of signals to be functionally mature for supporting thymocyte development. Tumor necrosis factor receptor (TNFR) family members including the receptor activator for NFκB (RANK), CD40, and lymphotoxin β receptor (LTβR) cooperatively control the thymic medullary microenvironment and self-tolerance establishment. In addition, fibroblast growth factors (FGFs), Wnt, and Notch signals are essential for establishment of functional thymic microenvironment. Transcription factors Foxn1 and autoimmune regulator (Aire) are powerful modulators of TEC development, differentiation, and self-tolerance. Dysfunction in thymic microenvironment including defects of TEC and thymocyte development would cause physiological disorders such as tumor, infectious diseases, and autoimmune diseases. In the present review, we will summarize our current understanding on TEC development and the underlying molecular signals pathways and the involvement of thymus dysfunction in human diseases.
Collapse
|
67
|
Neural crest-specific deletion of Ldb1 leads to cleft secondary palate with impaired palatal shelf elevation. BMC DEVELOPMENTAL BIOLOGY 2014; 14:3. [PMID: 24433583 PMCID: PMC3899388 DOI: 10.1186/1471-213x-14-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 01/08/2014] [Indexed: 11/10/2022]
Abstract
Background LIM domain binding protein 1 (LDB1) is a transcriptional co-factor, which interacts with multiple transcription factors and other proteins containing LIM domains. Complete inactivation of Ldb1 in mice resulted in early embryonic lethality with severe patterning defects during gastrulation. Tissue-specific deletions using a conditional knockout allele revealed additional roles of Ldb1 in the development of the central nervous system, hematopoietic system, and limbs. The goal of the current study was to determine the importance of Ldb1 function during craniofacial development in mouse embryos. Results We generated tissue-specific Ldb1 mutants using Wnt1-Cre, which causes deletion of a floxed allele in the neural crest; neural crest-derived cells contribute to most of the mesenchyme of the developing face. All examined Wnt1-Cre;Ldb1fl/- mutants suffered from cleft secondary palate. Therefore, we performed a series of experiments to investigate how Ldb1 regulated palate development. First, we examined the expression of Ldb1 during normal development, and found that Ldb1 was expressed broadly in the palatal mesenchyme during early stages of palate development. Second, we compared the morphology of the developing palate in control and Ldb1 mutant embryos using sections. We found that the mutant palatal shelves had abnormally blunt appearance, and failed to elevate above the tongue at the posterior domain. An in vitro head culture experiment indicated that the elevation defect was not due to interference by the tongue. Finally, in the Ldb1 mutant palatal shelves, cell proliferation was abnormal in the anterior, and the expression of Wnt5a, Pax9 and Osr2, which regulate palatal shelf elevation, was also altered. Conclusions The function of Ldb1 in the neural crest-derived palatal mesenchyme is essential for normal morphogenesis of the secondary palate.
Collapse
|
68
|
Okamoto T. The epigenetic alteration of synovial cell gene expression in rheumatoid arthritis and the roles of nuclear factor κB and Notch signaling pathways. Mod Rheumatol 2014. [DOI: 10.3109/s10165-004-0372-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|
69
|
McManus MM, Weiss KR, Hughes DPM. Understanding the role of Notch in osteosarcoma. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 804:67-92. [PMID: 24924169 DOI: 10.1007/978-3-319-04843-7_4] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The Notch pathway has been described as an oncogene in osteosarcoma, but the myriad functions of all the members of this complex signaling pathway, both in malignant cells and nonmalignant components of tumors, make it more difficult to define Notch as simply an oncogene or a tumor suppressor. The cell-autonomous behaviors caused by Notch pathway manipulation may vary between cell lines but can include changes in proliferation, migration, invasiveness, oxidative stress resistance, and expression of markers associated with stemness or tumor-initiating cells. Beyond these roles, Notch signaling also plays a vital role in regulating tumor angiogenesis and vasculogenesis, which are vital aspects of osteosarcoma growth and behavior in vivo. Further, osteosarcoma cells themselves express relatively low levels of Notch ligand, making it likely that nonmalignant cells, especially endothelial cells and pericytes, are the major source of Notch activation in osteosarcoma tumors in vivo and in patients. As a result, Notch pathway expression is not expected to be uniform across a tumor but likely to be highest in those areas immediately adjacent to blood vessels. Therapeutic targeting of the Notch pathway is likewise expected to be complicated. Most pharmacologic approaches thus far have focused on inhibition of gamma secretase, a protease of the presenilin complex. This enzyme, however, has numerous other target proteins that would be expected to affect osteosarcoma behavior, including CD44, the WNT/β-catenin pathway, and Her-4. In addition, Notch plays a vital role in tissue and organ homeostasis in numerous systems, and toxicities, especially GI intolerance, have limited the effectiveness of gamma secretase inhibitors. New approaches are in development, and the downstream targets of Notch pathway signaling also may turn out to be good targets for therapy. In summary, a full understanding of the complex functions of Notch in osteosarcoma is only now unfolding, and this deeper knowledge will help position the field to better utilize novel therapies as they are developed.
Collapse
Affiliation(s)
- Madonna M McManus
- The Children's Cancer Hospital at MD Anderson Cancer Center, Houston, TX, USA
| | | | | |
Collapse
|
70
|
Bigas A, Guiu J, Gama-Norton L. Notch and Wnt signaling in the emergence of hematopoietic stem cells. Blood Cells Mol Dis 2013; 51:264-70. [DOI: 10.1016/j.bcmd.2013.07.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Accepted: 04/28/2013] [Indexed: 10/26/2022]
|
71
|
Münder S, Tischer S, Grundhuber M, Büchels N, Bruckmeier N, Eckert S, Seefeldt CA, Prexl A, Käsbauer T, Böttger A. Notch-signalling is required for head regeneration and tentacle patterning in Hydra. Dev Biol 2013; 383:146-57. [PMID: 24012879 DOI: 10.1016/j.ydbio.2013.08.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2013] [Revised: 08/22/2013] [Accepted: 08/26/2013] [Indexed: 12/20/2022]
Abstract
Local self-activation and long ranging inhibition provide a mechanism for setting up organising regions as signalling centres for the development of structures in the surrounding tissue. The adult hydra hypostome functions as head organiser. After hydra head removal it is newly formed and complete heads can be regenerated. The molecular components of this organising region involve Wnt-signalling and β-catenin. However, it is not known how correct patterning of hypostome and tentacles are achieved in the hydra head and whether other signals in addition to HyWnt3 are needed for re-establishing the new organiser after head removal. Here we show that Notch-signalling is required for re-establishing the organiser during regeneration and that this is due to its role in restricting tentacle activation. Blocking Notch-signalling leads to the formation of irregular head structures characterised by excess tentacle tissue and aberrant expression of genes that mark the tentacle boundaries. This indicates a role for Notch-signalling in defining the tentacle pattern in the hydra head. Moreover, lateral inhibition by HvNotch and its target HyHes are required for head regeneration and without this the formation of the β-catenin/Wnt dependent head organiser is impaired. Work on prebilaterian model organisms has shown that the Wnt-pathway is important for setting up signalling centres for axial patterning in early multicellular animals. Our data suggest that the integration of Wnt-signalling with Notch-Delta activity was also involved in the evolution of defined body plans in animals.
Collapse
Affiliation(s)
- Sandra Münder
- Department of Biology 2, Ludwig-Maximilians-Universität München, Munich, Germany.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
72
|
Tanriverdi G, Denir S, Ayla S, Bilir A, Oktar H, Cepni I, Irez T. Notch signaling pathway in cumulus cells can be a novel marker to identify poor and normal responder IVF patients. J Assist Reprod Genet 2013; 30:1319-26. [PMID: 23922013 DOI: 10.1007/s10815-013-0072-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 07/26/2013] [Indexed: 12/20/2022] Open
Abstract
PURPOSE To identify expression of Notch signaling proteins and its ligands in human cumulus cells which were obtained by follicle aspiration and to compare the differences of this protein expression between the normal and poor responder patients. METHODS 47 patients who applied to the assisted reproductive treatments with various infertility problems were included to the study. Controlled ovarian hyperstimulation was performed by using GnRH agonist and gonadotropins. Serum hormon levels were measured by using Chemilluminescent Microparticle Immunoassay method for each patient. After ultrasonographic ovarian follicle screening, oocytes were retrievaled. Cumulus cells obtained from the follicles were cultured for 72 h and immunuhistochemistry were performed for Notch1, Notch2, Notch3, Notch4, Jagged1 and Jagged2 proteins. Histological score (HSCORE) were applied to all of the samples. The association between Notch and its ligands protein expressions and the oocyte-embryo quality and fertilization rates were investigated. RESULTS Significant differences were observed between the mean values of age, AMH and FSH in the 2 groups, respectively (p < 0.05). However, the mean female infertility duration and total gonadotropin dose did not differ significantly between normal and poor responder groups. All the patients cumulus cells expressed Notch1, Notch2, Notch3, Notch4, Jagged1 and Jagged2. There was a significant difference (p < 0.05) only for Notch2 between the 2 groups and a positive correlation between Notch2 and Notch3 (r = 547, p = 0.00) expressions were noted. Furthermore, no correlations were observed between the following: Notch1, Notch2, Notch3, Notch4, Jagged1, and Jagged2 expression; mature oocyte number; fertilization rates, and embryo quality percentage in both of the groups. CONCLUSION Notch signalling proteins can be an indicator for understanding the ovarian response in ovulation induction.
Collapse
Affiliation(s)
- Gamze Tanriverdi
- Cerrahpasa Medical Faculty, Histology and Embryology Department, Istanbul University, 34098 , Cerrahpasa, Istanbul, Turkey,
| | | | | | | | | | | | | |
Collapse
|
73
|
Garside VC, Chang AC, Karsan A, Hoodless PA. Co-ordinating Notch, BMP, and TGF-β signaling during heart valve development. Cell Mol Life Sci 2013; 70:2899-917. [PMID: 23161060 PMCID: PMC4996658 DOI: 10.1007/s00018-012-1197-9] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Revised: 10/12/2012] [Accepted: 10/15/2012] [Indexed: 12/22/2022]
Abstract
Congenital heart defects affect approximately 1-5 % of human newborns each year, and of these cardiac defects 20-30 % are due to heart valve abnormalities. Recent literature indicates that the key factors and pathways that regulate valve development are also implicated in congenital heart defects and valve disease. Currently, there are limited options for treatment of valve disease, and therefore having a better understanding of valve development can contribute critical insight into congenital valve defects and disease. There are three major signaling pathways required for early specification and initiation of endothelial-to-mesenchymal transformation (EMT) in the cardiac cushions: BMP, TGF-β, and Notch signaling. BMPs secreted from the myocardium set up the environment for the overlying endocardium to become activated; Notch signaling initiates EMT; and both BMP and TGF-β signaling synergize with Notch to promote the transition of endothelia to mesenchyme and the mesenchymal cell invasiveness. Together, these three essential signaling pathways help form the cardiac cushions and populate them with mesenchyme and, consequently, set off the cascade of events required to develop mature heart valves. Furthermore, integration and cross-talk between these pathways generate highly stratified and delicate valve leaflets and septa of the heart. Here, we discuss BMP, TGF-β, and Notch signaling pathways during mouse cardiac cushion formation and how they together produce a coordinated EMT response in the developing mouse valves.
Collapse
Affiliation(s)
- Victoria C. Garside
- Terry Fox Laboratory, BC Cancer Agency, 675 West 10th Avenue, Vancouver, BC V5Z 1L3 Canada
- Cell and Developmental Biology Program, University of British Columbia, Vancouver, BC V6T 1Z4 Canada
| | - Alex C. Chang
- Michael Smith Genome Sciences Centre, BC Cancer Agency, 675 West 10th Avenue, Vancouver, BC V5Z 1L3 Canada
| | - Aly Karsan
- Michael Smith Genome Sciences Centre, BC Cancer Agency, 675 West 10th Avenue, Vancouver, BC V5Z 1L3 Canada
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z4 Canada
| | - Pamela A. Hoodless
- Terry Fox Laboratory, BC Cancer Agency, 675 West 10th Avenue, Vancouver, BC V5Z 1L3 Canada
- Cell and Developmental Biology Program, University of British Columbia, Vancouver, BC V6T 1Z4 Canada
- Department of Medical Genetics, University of British Columbia, Vancouver, BC V6T 1Z4 Canada
| |
Collapse
|
74
|
Abstract
The numerous processes involved in the etiology of breast cancer such as cell survival, metabolism, proliferation, differentiation, and angiogenesis are currently being elucidated. However, underlying mechanisms that drive breast cancer progression and drug resistance are still poorly understood. As we discuss here in detail, the Notch signaling pathway is an important regulatory component of normal breast development, cell fate of normal breast stem cells, and proliferation and survival of breast cancer initiating cells. Notch exerts a wide range of critical effects through a canonical pathway where it is expressed as a type I membrane precursor heterodimer followed by at least two subsequent cleavages induced by ligand engagement to ultimately release an intracellular form to function as a transcriptional activator. Notch and its ligands are overexpressed in breast cancer, and one method of effectively blocking Notch activity is preventing its cleavage at the cell surface with γ-secretase inhibitors. In the context of Notch signaling, the application of clinically relevant anti-Notch drugs in treatment regimens may contribute to novel therapeutic interventions and promote more effective clinical response in women with breast cancer.
Collapse
Affiliation(s)
- Roma Olsauskas-Kuprys
- The Oncology Institute, Cardinal Bernardin Cancer Center, Loyola University Chicago, Chicago, IL, USA
| | | | | |
Collapse
|
75
|
Popovic M, Zlatev V, Hodnik V, Anderluh G, Felli IC, Pongor S, Pintar A. Flexibility of the PDZ-binding motif in the micelle-bound form of Jagged-1 cytoplasmic tail. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1818:1706-16. [PMID: 22465068 DOI: 10.1016/j.bbamem.2012.03.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 03/13/2012] [Accepted: 03/14/2012] [Indexed: 01/07/2023]
Abstract
Human Jagged-1, one of the ligands of Notch receptors, is a transmembrane protein composed of a large extracellular region and a 125-residue cytoplasmic tail which bears a C-terminal PDZ recognition motif. To investigate the interaction between Jagged-1 cytoplasmic tail and the inner leaflet of the plasma membrane we determined, by solution NMR, the secondary structure and dynamics of the recombinant protein corresponding to the intracellular region of Jagged-1, J1_tmic, bound to negatively charged lysophospholipid micelles. NMR showed that the PDZ binding motif is preceded by four alpha-helical segments and that, despite the extensive interaction between J1_tmic and the micelle, the PDZ binding motif remains highly flexible. Binding of J1_tmic to negatively charged, but not to zwitterionic vesicles, was confirmed by surface plasmon resonance. To study the PDZ binding region in more detail, we prepared a peptide corresponding to the last 24 residues of Jagged-1, J1C24, and different phosphorylated variants of it. J1C24 displays a marked helical propensity and undergoes a coil-helix transition in the presence of negatively charged, but not zwitterionic, lysophospholipid micelles. Phosphorylation at different positions drastically decreases the helical propensity of the peptides and abolishes the coil-helix transition triggered by lysophospholipid micelles. We propose that phosphorylation of residues upstream of the PDZ binding motif may shift the equilibrium from an ordered, membrane-bound, interfacial form of Jagged-1 C-terminal region to a more disordered form with an increased accessibility of the PDZ recognition motif, thus playing an indirect role in the interaction between Jagged-1 and the PDZ-containing target protein.
Collapse
Affiliation(s)
- Matija Popovic
- International Centre for Genetic Engineering and Biotechnology, AREA Science Park Padriciano 99, 1-34149 Trieste, Italy
| | | | | | | | | | | | | |
Collapse
|
76
|
Ma L, Shi B, Zheng Q. Targeted mutations of genes reveal important roles in palatal development in mice. Ann Plast Surg 2013; 74:263-8. [PMID: 23851369 DOI: 10.1097/sap.0b013e318295dcb8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The process of palatal development is regulated by growth factors, extracellular matrix (ECM) protein, and cell adhesion molecules, of which disturbance may result in cleft palate. Knockout mice are important animal models for studying the role of genes during palatal development. Therefore, in this review, we will describe genes knockout in mice to reveal the biological mechanisms of these genes in the formation of the cleft palate.
Collapse
Affiliation(s)
- Li Ma
- From the *Department of Cleft Lip and Palate Surgery, West China Stomatological Hospital, Sichuan University; †State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | | | | |
Collapse
|
77
|
Abstract
Gonocytes (or prospermatogonia) are the precursors to spermatogonial stem cells (SSCs), which provide the foundation for spermatogenesis through their ability to both self-renew and generate daughter cells. Despite their relative importance, the regulatory mechanisms that govern gonocyte maintenance and transition to SSCs are poorly understood. Recently, we reported that constitutive activation of NOTCH1 signaling in Sertoli cells causes gonocyte exit from quiescence--the first suggestion of the potential role of this signaling pathway in the testis. This Extra View will review what is known about NOTCH signaling, particularly in Sertoli cells and germ cells in the testes, by providing a background on germ cell biology and a summary of our recently published data on NOTCH1 signaling in Sertoli cells. We also describe additional data showing that aberrant proliferation and differentiation of gonocytes in response to constitutive activation of NOTCH1 signaling in Sertoli cells involves de novo expression of cell cycle proteins and a marked upregulation of the KIT receptor. These data further suggest that NOTCH signaling orchestrates a dynamic balance between maintenance and differentiation of gonocytes in the perinatal testis.
Collapse
Affiliation(s)
- Thomas Xavier Garcia
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | | |
Collapse
|
78
|
Notch signalling is required for the formation of structurally stable muscle fibres in zebrafish. PLoS One 2013; 8:e68021. [PMID: 23840804 PMCID: PMC3695967 DOI: 10.1371/journal.pone.0068021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 05/23/2013] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Accurate regulation of Notch signalling is central for developmental processes in a variety of tissues, but its function in pectoral fin development in zebrafish is still unknown. METHODOLOGY/PRINCIPAL FINDINGS Here we show that core elements necessary for a functional Notch pathway are expressed in developing pectoral fins in or near prospective muscle territories. Blocking Notch signalling at different levels of the pathway consistently leads to the formation of thin, wavy, fragmented and mechanically weak muscles fibres and loss of stress fibres in endoskeletal disc cells in pectoral fins. Although the structural muscle genes encoding Desmin and Vinculin are normally transcribed in Notch-disrupted pectoral fins, their proteins levels are severely reduced, suggesting that weak mechanical forces produced by the muscle fibres are unable to stabilize/localize these proteins. Moreover, in Notch signalling disrupted pectoral fins there is a decrease in the number of Pax7-positive cells indicative of a defect in myogenesis. CONCLUSIONS/SIGNIFICANCE We propose that by controlling the differentiation of myogenic progenitor cells, Notch signalling might secure the formation of structurally stable muscle fibres in the zebrafish pectoral fin.
Collapse
|
79
|
Tung JJ, Tattersall IW, Kitajewski J. Tips, stalks, tubes: notch-mediated cell fate determination and mechanisms of tubulogenesis during angiogenesis. Cold Spring Harb Perspect Med 2013; 2:a006601. [PMID: 22355796 DOI: 10.1101/cshperspect.a006601] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Angiogenesis is the process of developing vascular sprouts from existing blood vessels. Luminal endothelial cells convert into "tip" cells that contribute to the development of a multicellular stalk, which then undergoes lumen formation. In this review, we consider a variety of cellular and molecular pathways that mediate these transitions. We focus first on Notch signaling in cell fate determination as a mechanism to define tip and stalk cells. We next discuss the current models of lumen formation and describe new players in this process, such as chloride intracellular channel proteins. Finally, we consider the possible medical therapeutic benefits of understanding these processes and acknowledge potential obstacles in drug development.
Collapse
Affiliation(s)
- Jennifer J Tung
- Department of Obstetrics/Gynecology and Pathology, Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, New York 10032, USA
| | | | | |
Collapse
|
80
|
Abstract
Notch receptors are single-pass transmembrane proteins that determine cell fate. Upon Notch ligand interactions, proteolytic cleavages release the Notch intracellular domain, which translocates to the nucleus to regulate the transcription of target genes, including Hairy enhancer of split (Hes) and Hes related to YRPW motif (Hey). Notch is critical for skeletal development and activity of skeletal cells, and dysregulation of Notch signaling is associated with human diseases affecting the skeleton. Inherited or sporadic mutations in components of the Notch signaling pathway are associated with spondylocostal dysostosis, spondylothoracic dysostosis and recessive brachydactyly, diseases characterized by skeletal patterning defects. Inactivating mutations of the Notch ligand JAG1 or of NOTCH2 are associated with Alagille syndrome, and activating mutations in NOTCH2 are associated with Hajdu-Cheney syndrome (HCS). Individuals affected by HCS exhibit osteolysis in distal phalanges and osteoporosis. NOTCH is activated in selected tumors, such as osteosarcoma, and in breast cancer cells that form osteolytic bone metastases. In conclusion, Notch regulates skeletal development and bone remodeling, and gain- or loss-of-function mutations of Notch signaling result in important skeletal diseases.
Collapse
Affiliation(s)
- Stefano Zanotti
- Department of Research, Saint Francis Hospital and Medical Center, Hartford, CT 06105 USA
- The University of Connecticut School of Medicine, Farmington, CT 06030, USA
| | - Ernesto Canalis
- Department of Research, Saint Francis Hospital and Medical Center, Hartford, CT 06105 USA
- The University of Connecticut School of Medicine, Farmington, CT 06030, USA
- Address correspondence: Ernesto Canalis, M.D. Department of Research, Saint Francis Hospital and Medical Center, 114 Woodland Street, Hartford, CT 06105-1299, Tel: (860)714-4068, Fax: (860)714-8053,
| |
Collapse
|
81
|
Van de Walle I, Waegemans E, De Medts J, De Smet G, De Smedt M, Snauwaert S, Vandekerckhove B, Kerre T, Leclercq G, Plum J, Gridley T, Wang T, Koch U, Radtke F, Taghon T. Specific Notch receptor-ligand interactions control human TCR-αβ/γδ development by inducing differential Notch signal strength. ACTA ACUST UNITED AC 2013; 210:683-97. [PMID: 23530123 PMCID: PMC3620353 DOI: 10.1084/jem.20121798] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Jagged2 preferentially signals through Notch3 to promote γδ T cell development. In humans, high Notch activation promotes γδ T cell development, whereas lower levels promote αβ-lineage differentiation. How these different Notch signals are generated has remained unclear. We show that differential Notch receptor–ligand interactions mediate this process. Whereas Delta-like 4 supports both TCR-αβ and -γδ development, Jagged1 induces mainly αβ-lineage differentiation. In contrast, Jagged2-mediated Notch activation primarily results in γδ T cell development and represses αβ-lineage differentiation by inhibiting TCR-β formation. Consistently, TCR-αβ T cell development is rescued through transduction of a TCR-β transgene. Jagged2 induces the strongest Notch signal through interactions with both Notch1 and Notch3, whereas Delta-like 4 primarily binds Notch1. In agreement, Notch3 is a stronger Notch activator and only supports γδ T cell development, whereas Notch1 is a weaker activator supporting both TCR-αβ and -γδ development. Fetal thymus organ cultures in JAG2-deficient thymic lobes or with Notch3-blocking antibodies confirm the importance of Jagged2/Notch3 signaling in human TCR-γδ differentiation. Our findings reveal that differential Notch receptor–ligand interactions mediate human TCR-αβ and -γδ T cell differentiation and provide a mechanistic insight into the high Notch dependency of human γδ T cell development.
Collapse
Affiliation(s)
- Inge Van de Walle
- The Department of Clinical Chemistry, Microbiology and Immunology, Faculty of Medicine and Health Sciences, Ghent University, Ghent University Hospital, 9000 Ghent, Belgium
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
82
|
Ubiquitinations in the notch signaling pathway. Int J Mol Sci 2013; 14:6359-81. [PMID: 23519106 PMCID: PMC3634445 DOI: 10.3390/ijms14036359] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 03/11/2013] [Accepted: 03/14/2013] [Indexed: 12/22/2022] Open
Abstract
The very conserved Notch pathway is used iteratively during development and adulthood to regulate cell fates. Notch activation relies on interactions between neighboring cells, through the binding of Notch receptors to their ligands, both transmembrane molecules. This inter-cellular contact initiates a cascade of events eventually transforming the cell surface receptor into a nuclear factor acting on the transcription of specific target genes. This review highlights how the various processes undergone by Notch receptors and ligands that regulate the pathway are linked to ubiquitination events.
Collapse
|
83
|
The etiology of cleft palate formation in BMP7-deficient mice. PLoS One 2013; 8:e59463. [PMID: 23516636 PMCID: PMC3597594 DOI: 10.1371/journal.pone.0059463] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 02/18/2013] [Indexed: 12/18/2022] Open
Abstract
Palatogenesis is a complex process implying growth, elevation and fusion of the two lateral palatal shelves during embryogenesis. This process is tightly controlled by genetic and mechanistic cues that also coordinate the growth of other orofacial structures. Failure at any of these steps can result in cleft palate, which is a frequent craniofacial malformation in humans. To understand the etiology of cleft palate linked to the BMP signaling pathway, we studied palatogenesis in Bmp7-deficient mouse embryos. Bmp7 expression was found in several orofacial structures including the edges of the palatal shelves prior and during their fusion. Bmp7 deletion resulted in a general alteration of oral cavity morphology, unpaired palatal shelf elevation, delayed shelf approximation, and subsequent lack of fusion. Cell proliferation and expression of specific genes involved in palatogenesis were not altered in Bmp7-deficient embryos. Conditional ablation of Bmp7 with Keratin14-Cre or Wnt1-Cre revealed that neither epithelial nor neural crest-specific loss of Bmp7 alone could recapitulate the cleft palate phenotype. Palatal shelves from mutant embryos were able to fuse when cultured in vitro as isolated shelves in proximity, but not when cultured as whole upper jaw explants. Thus, deformations in the oral cavity of Bmp7-deficient embryos such as the shorter and wider mandible were not solely responsible for cleft palate formation. These findings indicate a requirement for Bmp7 for the coordination of both developmental and mechanistic aspects of palatogenesis.
Collapse
|
84
|
Song Z, Liu C, Iwata J, Gu S, Suzuki A, Sun C, He W, Shu R, Li L, Chai Y, Chen Y. Mice with Tak1 deficiency in neural crest lineage exhibit cleft palate associated with abnormal tongue development. J Biol Chem 2013; 288:10440-50. [PMID: 23460641 DOI: 10.1074/jbc.m112.432286] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Cleft palate represents one of the most common congenital birth defects in humans. TGFβ signaling, which is mediated by Smad-dependent and Smad-independent pathways, plays a crucial role in regulating craniofacial development and patterning, particularly in palate development. However, it remains largely unknown whether the Smad-independent pathway contributes to TGFβ signaling function during palatogenesis. In this study, we investigated the function of TGFβ activated kinase 1 (Tak1), a key regulator of Smad-independent TGFβ signaling in palate development. We show that Tak1 protein is expressed in both the epithelium and mesenchyme of the developing palatal shelves. Whereas deletion of Tak1 in the palatal epithelium or mesenchyme did not give rise to a cleft palate defect, inactivation of Tak1 in the neural crest lineage using the Wnt1-Cre transgenic allele resulted in failed palate elevation and subsequently the cleft palate formation. The failure in palate elevation in Wnt1-Cre;Tak1(F/F) mice results from a malformed tongue and micrognathia, resembling human Pierre Robin sequence cleft of the secondary palate. We found that the abnormal tongue development is associated with Fgf10 overexpression in the neural crest-derived tongue tissue. The failed palate elevation and cleft palate were recapitulated in an Fgf10-overexpressing mouse model. The repressive effect of the Tak1-mediated noncanonical TGFβ signaling on Fgf10 expression was further confirmed by inhibition of p38, a downstream kinase of Tak1, in the primary cell culture of developing tongue. Tak1 thus functions to regulate tongue development by controlling Fgf10 expression and could represent a candidate gene for mutation in human PRS clefting.
Collapse
Affiliation(s)
- Zhongchen Song
- Department of Periodontology, Ninth People's Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, China
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
85
|
Lossie AC, Lo CL, Baumgarner KM, Cramer MJ, Garner JP, Justice MJ. ENU mutagenesis reveals that Notchless homolog 1 (Drosophila) affects Cdkn1a and several members of the Wnt pathway during murine pre-implantation development. BMC Genet 2012; 13:106. [PMID: 23231322 PMCID: PMC3558363 DOI: 10.1186/1471-2156-13-106] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 11/24/2012] [Indexed: 01/20/2023] Open
Abstract
Background Our interests lie in determining the genes and genetic pathways that are important for establishing and maintaining maternal-fetal interactions during pregnancy. Mutation analysis targeted to a 34 Mb domain flanked by Trp53 and Wnt3 demonstrates that this region of mouse chromosome 11 contains a large number of essential genes. Two mutant alleles (l11Jus1 and l11Jus4), which fall into the same complementation group, survive through implantation but fail prior to gastrulation. Results Through a positional cloning strategy, we discovered that these homozygous mutant alleles contain non-conservative missense mutations in the Notchless homolog 1 (Drosophila) (Nle1) gene. NLE1 is a member of the large WD40-repeat protein family, and is thought to signal via the canonical NOTCH pathway in vertebrates. However, the phenotype of the Nle1 mutant mice is much more severe than single Notch receptor mutations or even in animals in which NOTCH signaling is blocked. To test the hypothesis that NLE1 functions in multiple signaling pathways during pre-implantation development, we examined expression of multiple Notch downstream target genes, as well as select members of the Wnt pathway in wild-type and mutant embryos. We did not detect altered expression of any primary members of the Notch pathway or in Notch downstream target genes. However, our data reveal that Cdkn1a, a NOTCH target, was upregulated in Nle1 mutants, while several members of the Wnt pathway are downregulated. In addition, we found that Nle1 mutant embryos undergo caspase-mediated apoptosis as hatched blastocysts, but not as morulae or blastocysts. Conclusions Taken together, these results uncover potential novel functions for NLE1 in the WNT and CDKN1A pathways during embryonic development in mammals.
Collapse
Affiliation(s)
- Amy C Lossie
- Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA.
| | | | | | | | | | | |
Collapse
|
86
|
Dahal GR, Rawson J, Gassaway B, Kwok B, Tong Y, Ptácek LJ, Bates E. An inwardly rectifying K+ channel is required for patterning. Development 2012; 139:3653-64. [PMID: 22949619 DOI: 10.1242/dev.078592] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Mutations that disrupt function of the human inwardly rectifying potassium channel KIR2.1 are associated with the craniofacial and digital defects of Andersen-Tawil Syndrome, but the contribution of Kir channels to development is undefined. Deletion of mouse Kir2.1 also causes cleft palate and digital defects. These defects are strikingly similar to phenotypes that result from disrupted TGFβ/BMP signaling. We use Drosophila melanogaster to show that a Kir2.1 homolog, Irk2, affects development by disrupting BMP signaling. Phenotypes of irk2 deficient lines, a mutant irk2 allele, irk2 siRNA and expression of a dominant-negative Irk2 subunit (Irk2DN) all demonstrate that Irk2 function is necessary for development of the adult wing. Compromised Irk2 function causes wing-patterning defects similar to those found when signaling through a Drosophila BMP homolog, Decapentaplegic (Dpp), is disrupted. To determine whether Irk2 plays a role in the Dpp pathway, we generated flies in which both Irk2 and Dpp functions are reduced. Irk2DN phenotypes are enhanced by decreased Dpp signaling. In wild-type flies, Dpp signaling can be detected in stripes along the anterior/posterior boundary of the larval imaginal wing disc. Reducing function of Irk2 with siRNA, an irk2 deletion, or expression of Irk2DN reduces the Dpp signal in the wing disc. As Irk channels contribute to Dpp signaling in flies, a similar role for Kir2.1 in BMP signaling may explain the morphological defects of Andersen-Tawil Syndrome and the Kir2.1 knockout mouse.
Collapse
Affiliation(s)
- Giri Raj Dahal
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
| | | | | | | | | | | | | |
Collapse
|
87
|
Boucherat O, Chakir J, Jeannotte L. The loss of Hoxa5 function promotes Notch-dependent goblet cell metaplasia in lung airways. Biol Open 2012; 1:677-91. [PMID: 23213461 PMCID: PMC3507293 DOI: 10.1242/bio.20121701] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Hox genes encode transcription factors controlling complex developmental processes in various organs. Little is known, however, about how HOX proteins control cell fate. Herein, we demonstrate that the goblet cell metaplasia observed in lung airways from Hoxa5−/− mice originates from the transdifferentiation of Clara cells. Reduced CC10 expression in Hoxa5−/− embryos indicates that altered cell specification occurs prior to birth. The loss of Hoxa5 function does not preclude airway repair after naphthalene exposure, but the regenerated epithelium presents goblet cell metaplasia and less CC10-positive cells, demonstrating the essential role of Hoxa5 for correct differentiation. Goblet cell metaplasia in Hoxa5−/− mice is a FOXA2-independent process. However, it is associated with increased Notch signaling activity. Consistent with these findings, expression levels of activated NOTCH1 and the effector gene HEY2 are enhanced in patients with chronic obstructive pulmonary disease. In vivo administration of a γ-secretase inhibitor attenuates goblet cell metaplasia in Hoxa5−/− mice, highlighting the contribution of Notch signaling to the phenotype and suggesting a potential therapeutic strategy to inhibit goblet cell differentiation and mucus overproduction in airway diseases. In summary, the loss of Hoxa5 function in lung mesenchyme impacts on epithelial cell fate by modulating Notch signaling.
Collapse
Affiliation(s)
- Olivier Boucherat
- Centre de recherche en cancérologie de l'Université Laval, Centre Hospitalier Universitaire de Québec , L'Hôtel-Dieu de Québec, 9 rue McMahon, Québec QC G1R 2J6 , Canada
| | | | | |
Collapse
|
88
|
Zuniga A, Zeller R, Probst S. The molecular basis of human congenital limb malformations. WILEY INTERDISCIPLINARY REVIEWS-DEVELOPMENTAL BIOLOGY 2012; 1:803-22. [PMID: 23799625 DOI: 10.1002/wdev.59] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This review focuses predominantly on the human congenital malformations caused by alterations affecting the morphoregulatory gene networks that control early limb bud patterning and outgrowth. Limb defects are among the most frequent congenital malformations in humans that are caused by genetic mutations or teratogenic effects resulting either in abnormal, loss of, or additional skeletal elements. Spontaneous and engineered mouse models have been used to identify and study the molecular alterations and disrupted gene networks that underlie human congenital limb malformations. More recently, mouse genetics has begun to reveal the alterations that affect the often-large cis-regulatory landscapes that control gene expression in limb buds and cause devastating effects on limb bud development. These findings have paved the way to identifying mutations in cis-regulatory regions as causal to an increasing number of congenital limb malformations in humans. In these cases, no mutations in the coding region of a presumed candidate were previously detected. This review highlights how the current understanding of the molecular gene networks and interactions that control mouse limb bud development provides insight into the etiology of human congenital limb malformations.
Collapse
Affiliation(s)
- Aimée Zuniga
- Developmental Genetics, Department of Biomedicine, University of Basel, Basel, Switzerland.
| | | | | |
Collapse
|
89
|
Jordan D, Hindocha S, Dhital M, Saleh M, Khan W. The epidemiology, genetics and future management of syndactyly. Open Orthop J 2012; 6:14-27. [PMID: 22448207 PMCID: PMC3308320 DOI: 10.2174/1874325001206010014] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Revised: 10/26/2011] [Accepted: 10/29/2011] [Indexed: 12/18/2022] Open
Abstract
Syndactyly is a condition well documented in current literature due to it being the most common congenital hand defect, with a large aesthetic and functional significance.There are currently nine types of phenotypically diverse non-syndromic syndactyly, an increase since the original classification by Temtamy and McKusick(1978). Non-syndromic syndactyly is inherited as an autosomal dominant trait, although the more severe presenting types and sub types appear to have autosomal recessive and in some cases X-linked hereditary.Gene research has found that these phenotypes appear to not only be one gene specific, although having individual localised loci, but dependant on a wide range of genes and subsequent signalling pathways involved in limb formation. The principal genes so far defined to be involved in congenital syndactyly concern mainly the Zone of Polarizing Activity and Shh pathway.Research into the individual phenotypes appears to complicate classification as new genes are found both linked, and not linked, to each malformation. Consequently anatomical, phenotypical and genotypical classifications can be used, but are variable in significance, depending on the audience.Currently, management is surgical, with a technique unchanged for several decades, although future development will hopefully bring alternatives in both earlier diagnosis and gene manipulation for therapy.
Collapse
Affiliation(s)
- D Jordan
- Department of Plastic Surgery, Countess of Chester Hospital, Liverpool Road Chester, CH21UL, UK
| | - S Hindocha
- Department of Plastic Surgery, Countess of Chester Hospital, Liverpool Road Chester, CH21UL, UK
- Department of Plastic Surgery, Whiston Hospital, Warrington Road, L35 5DR, Liverpool, UK
| | - M Dhital
- University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - M Saleh
- Ain Shams University, Khalifa El-Maamon St, Abbasiya Sq, Cairo. 11566, Egypt
| | - W Khan
- University College London Institute of Orthopaedics and Musculoskeletal Sciences, Royal National Orthopaedic Hospital, Stanmore, Middlesex, HA7 4LP, UK
| |
Collapse
|
90
|
Tu X, Chen J, Lim J, Karner CM, Lee SY, Heisig J, Wiese C, Surendran K, Kopan R, Gessler M, Long F. Physiological notch signaling maintains bone homeostasis via RBPjk and Hey upstream of NFATc1. PLoS Genet 2012; 8:e1002577. [PMID: 22457635 PMCID: PMC3310726 DOI: 10.1371/journal.pgen.1002577] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Accepted: 01/18/2012] [Indexed: 01/22/2023] Open
Abstract
Notch signaling between neighboring cells controls many cell fate decisions in metazoans both during embryogenesis and in postnatal life. Previously, we uncovered a critical role for physiological Notch signaling in suppressing osteoblast differentiation in vivo. However, the contribution of individual Notch receptors and the downstream signaling mechanism have not been elucidated. Here we report that removal of Notch2, but not Notch1, from the embryonic limb mesenchyme markedly increased trabecular bone mass in adolescent mice. Deletion of the transcription factor RBPjk, a mediator of all canonical Notch signaling, in the mesenchymal progenitors but not the more mature osteoblast-lineage cells, caused a dramatic high-bone-mass phenotype characterized by increased osteoblast numbers, diminished bone marrow mesenchymal progenitor pool, and rapid age-dependent bone loss. Moreover, mice deficient in Hey1 and HeyL, two target genes of Notch-RBPjk signaling, exhibited high bone mass. Interestingly, Hey1 bound to and suppressed the NFATc1 promoter, and RBPjk deletion increased NFATc1 expression in bone. Finally, pharmacological inhibition of NFAT alleviated the high-bone-mass phenotype caused by RBPjk deletion. Thus, Notch-RBPjk signaling functions in part through Hey1-mediated inhibition of NFATc1 to suppress osteoblastogenesis, contributing to bone homeostasis in vivo. Osteoporosis is a disease caused by disruption of the balance between bone formation and resorption resulting in a net loss of bone mass. Although anti-resorptive agents are the current mainstay of osteoporosis therapy, novel strategies to promote bone formation are critically needed for more effective prevention and treatment of the disease. Notch signaling, an evolutionally conserved mechanism among multi-cellular organisms, was recently shown to control bone formation and therefore represents a potential target pathway for novel bone-promoting therapeutics. In this study we elucidate the intracellular signaling mechanism through which Notch controls bone formation, providing a molecular framework that may guide future drug development.
Collapse
Affiliation(s)
- Xiaolin Tu
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
91
|
Funato N, Nakamura M, Richardson JA, Srivastava D, Yanagisawa H. Tbx1 regulates oral epithelial adhesion and palatal development. Hum Mol Genet 2012; 21:2524-37. [PMID: 22371266 DOI: 10.1093/hmg/dds071] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Cleft palate, the most frequent congenital craniofacial birth defect, is a multifactorial condition induced by the interaction of genetic and environmental factors. In addition to complete cleft palate, a large number of human cases involve soft palate cleft and submucosal cleft palate. However, the etiology of these forms of cleft palate has not been well understood. T-box transcriptional factor (Tbx) family of transcriptional factors has distinct roles in a wide range of embryonic differentiation or response pathways. Here, we show that genetic disruption of Tbx1, a major candidate gene for the human congenital disorder 22q11.2 deletion syndrome (Velo-cardio-facial/DiGeorge syndrome), led to abnormal epithelial adhesion between the palate and mandible in mouse, resulting in various forms of cleft palate similar to human conditions. We found that hyperproliferative epithelium failed to undergo complete differentiation in Tbx1-null mice (Tbx1(-/-)). Inactivation of Tbx1 specifically in the keratinocyte lineage (Tbx1(KCKO)) resulted in an incomplete cleft palate confined to the anterior region of the palate. Interestingly, Tbx1 overexpression resulted in decreased cell growth and promoted cell-cycle arrest in MCF7 epithelial cells. These findings suggest that Tbx1 regulates the balance between proliferation and differentiation of keratinocytes and is essential for palatal fusion and oral mucosal differentiation. The impaired adhesion separation of the oral epithelium together with compromised palatal mesenchymal growth is an underlying cause for various forms of cleft palate phenotypes in Tbx1(-/-) mice. Our present study reveals new pathogenesis of incomplete and submucous cleft palate during mammalian palatogenesis.
Collapse
Affiliation(s)
- Noriko Funato
- Human Gene Sciences Center, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | | | | | | | | |
Collapse
|
92
|
The role of Irf6 in tooth epithelial invagination. Dev Biol 2012; 365:61-70. [PMID: 22366192 DOI: 10.1016/j.ydbio.2012.02.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 02/03/2012] [Accepted: 02/07/2012] [Indexed: 01/24/2023]
Abstract
Thickening and the subsequent invagination of the epithelium are an important initial step in ectodermal organ development. Ikkα has been shown to play a critical role in controlling epithelial growth, since Ikkα mutant mice show protrusions (evaginations) of incisor tooth, whisker and hair follicle epithelium rather than invagination. We show here that mutation of the Interferon regulatory factor (Irf) family, Irf6 also results in evagination of incisor epithelium. In common with Ikkα mutants, Irf6 mutant evagination occurs in a NF-κB-independent manner and shows the same molecular changes as those in Ikkα mutants. Irf6 thus also plays a critical role in regulating epithelial invagination. In addition, we also found that canonical Wnt signaling is upregulated in evaginated incisor epithelium of both Ikkα and Irf6 mutant embryos.
Collapse
|
93
|
Falix FA, Aronson DC, Lamers WH, Gaemers IC. Possible roles of DLK1 in the Notch pathway during development and disease. Biochim Biophys Acta Mol Basis Dis 2012; 1822:988-95. [PMID: 22353464 DOI: 10.1016/j.bbadis.2012.02.003] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Revised: 01/18/2012] [Accepted: 02/06/2012] [Indexed: 12/13/2022]
Abstract
The Delta-Notch pathway is an evolutionarily conserved signaling pathway which controls a broad range of developmental processes including cell fate determination, terminal differentiation and proliferation. In mammals, four Notch receptors (NOTCH1-4) and five activating canonical ligands (JAGGED1, JAGGED2, DLL1, DLL3 and DLL4) have been described. The precise function of noncanonical Notch ligands remains unclear. Delta-like 1 homolog (DLK1), the best studied noncanonical Notch ligand, has been shown to act as an inhibitor of Notch signaling in vitro, but its function in vivo is poorly understood. In this review we summarize Notch signaling during development and highlight recent studies in DLK1expression that reveal new insights into its function.
Collapse
Affiliation(s)
- Farah A Falix
- Tytgat Institute for Liver and Intestinal Research, Academic Medical Center, Amsterdam, The Netherlands
| | | | | | | |
Collapse
|
94
|
Bush JO, Jiang R. Palatogenesis: morphogenetic and molecular mechanisms of secondary palate development. Development 2012; 139:231-43. [PMID: 22186724 DOI: 10.1242/dev.067082] [Citation(s) in RCA: 364] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Mammalian palatogenesis is a highly regulated morphogenetic process during which the embryonic primary and secondary palatal shelves develop as outgrowths from the medial nasal and maxillary prominences, respectively, remodel and fuse to form the intact roof of the oral cavity. The complexity of control of palatogenesis is reflected by the common occurrence of cleft palate in humans. Although the embryology of the palate has long been studied, the past decade has brought substantial new knowledge of the genetic control of secondary palate development. Here, we review major advances in the understanding of the morphogenetic and molecular mechanisms controlling palatal shelf growth, elevation, adhesion and fusion, and palatal bone formation.
Collapse
Affiliation(s)
- Jeffrey O Bush
- Department of Cell and Tissue Biology and Program in Craniofacial and Mesenchymal Biology, University of California at San Francisco, San Francisco, CA 94143, USA.
| | | |
Collapse
|
95
|
Zanotti S, Canalis E. Notch regulation of bone development and remodeling and related skeletal disorders. Calcif Tissue Int 2012; 90:69-75. [PMID: 22002679 PMCID: PMC3272107 DOI: 10.1007/s00223-011-9541-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Accepted: 09/14/2011] [Indexed: 10/16/2022]
Abstract
Notch signaling mediates cell-to-cell interactions that are critical for embryonic development and tissue renewal. In the canonical signaling pathway, the Notch receptor is cleaved following ligand binding, resulting in the release and nuclear translocation of the Notch intracellular domain (NICD). NICD induces gene expression by forming a ternary complex with the DNA binding protein CBF1/Rbp-Jk, Suppressor of Hairless, Lag1, and Mastermind-Like (Maml). Hairy Enhancer of Split (Hes) and Hes related with YRPW motif (Hey) are classic Notch targets. Notch canonical signaling plays a central role in skeletal development and bone remodeling by suppressing the differentiation of skeletal cells. The skeletal phenotype of mice misexpressing Hes1 phenocopies partially the effects of Notch misexpression, suggesting that Hey proteins mediate most of the skeletal effects of Notch. Dysregulation of Notch signaling is associated with diseases affecting human skeletal development, such as Alagille syndrome, brachydactyly and spondylocostal dysostosis. Somatic mutations in Notch receptors and ligands are found in tumors of the skeletal system. Overexpression of NOTCH1 is associated with osteosarcoma, and overexpression of NOTCH3 or JAGGED1 in breast cancer cells favors the formation of osteolytic bone metastasis. Activating mutations in NOTCH2 cause Hajdu-Cheney syndrome, which is characterized by skeletal defects and fractures, and JAG1 polymorphisms, are associated with variations in bone mineral density. In conclusion, Notch is a regulator of skeletal development and bone remodeling, and abnormal Notch signaling is associated with developmental and postnatal skeletal disorders.
Collapse
Affiliation(s)
- Stefano Zanotti
- Department of Research, Saint Francis Hospital and Medical Center, Hartford, CT 06105 USA
- The University of Connecticut School of Medicine, Farmington, CT 06030, USA
| | - Ernesto Canalis
- Department of Research, Saint Francis Hospital and Medical Center, Hartford, CT 06105 USA
- The University of Connecticut School of Medicine, Farmington, CT 06030, USA
- Address correspondence: Department of Research Saint Francis Hospital and Medical Center 114 Woodland Street Hartford, CT 06105-1299 Tel: (860)714-4068 Fax: (860)714-8053
| |
Collapse
|
96
|
|
97
|
González-García S, García-Peydró M, Alcain J, Toribio ML. Notch1 and IL-7 receptor signalling in early T-cell development and leukaemia. Curr Top Microbiol Immunol 2012; 360:47-73. [PMID: 22695916 DOI: 10.1007/82_2012_231] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Notch receptors are master regulators of many aspects of development and tissue renewal in metazoans. Notch1 activation is essential for T-cell specification of bone marrow-derived multipotent progenitors that seed the thymus, and for proliferation and further progression of early thymocytes along the T-cell lineage. Deregulated activation of Notch1 significantly contributes to the generation of T-cell acute lymphoblastic leukaemia (T-ALL). In addition to Notch1 signals, survival and proliferation signals provided by the IL-7 receptor (IL-7R) are also required during thymopoiesis. Our understanding of the molecular mechanisms controlling stage-specific survival and proliferation signals provided by Notch1 and IL-7R has recently been improved by the discovery that the IL-7R is a transcriptional target of Notch1. Thus, Notch1 controls T-cell development, in part by regulating the stage- and lineage-specific expression of IL-7R. The finding that induction of IL-7R expression downstream of Notch1 also occurs in T-ALL highlights the important contribution that deregulated IL-7R expression and function may have in this pathology. Confirming this notion, oncogenic IL7R gain-of-function mutations have recently been identified in childhood T-ALL. Here we discuss the fundamental role of Notch1 and IL-7R signalling pathways in physiological and pathological T-cell development in mice and men, highlighting their close molecular underpinnings.
Collapse
Affiliation(s)
- Sara González-García
- Centro de Biología Molecular, Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | | | | | | |
Collapse
|
98
|
Shah DK, Zúñiga-Pflücker JC. Notch receptor-ligand interactions during T cell development, a ligand endocytosis-driven mechanism. Curr Top Microbiol Immunol 2012; 360:19-46. [PMID: 22581027 DOI: 10.1007/82_2012_225] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Notch signaling plays an important role during the development of different cell types and tissues. The role of Notch signaling in lymphocyte development, in particular in the development and commitment to the T cell lineage, has been the focus of research for many years. Notch signaling is absolutely required during the commitment and early stages of T cell development. Activation of the Notch signaling pathway is initiated by ligand-receptor interactions and appears to require active endocytosis of Notch ligands. Studies addressing the mechanism underlying endocytosis of Notch ligands have helped to identify the main players important and necessary for this process. Here, we review the Notch ligands, and the proposed models of Notch activation by Notch ligand endocytosis, highlighting key molecules involved. In particular, we discuss recent studies on Notch ligands involved in T cell development, current studies aimed at elucidating the relevance of Notch ligand endocytosis during T cell development and the identification of key players necessary for ligand endocytosis in the thymus and during T cell development.
Collapse
Affiliation(s)
- Divya K Shah
- Department of Immunology, Sunnybrook Research Institute, University of Toronto, 2075 Bayview Avenue, Toronto, ON, M4 N 3M5, Canada.
| | | |
Collapse
|
99
|
Abstract
The differentiation of primordial germ cells (PGCs) into functional oocytes is important for the continuation of species. In mammals, PGCs begin to differentiate into oocytes during embryonic development. Oocytes develop in clusters called germ line cysts. During fetal or neonatal development, germ cell cysts break apart into single oocytes that become surrounded by pregranulosa cells to form primordial follicles. During the process of cyst breakdown, a subset of cells in each cyst undergoes cell death with only one-third of the initial number of oocytes surviving to form primordial follicles. The mechanisms that control cyst breakdown, oocyte survival, and follicle assembly are currently under investigation. This review describes the mechanisms that have been implicated in the control of primordial follicle formation, which include programmed cell death regulation, growth factor and other signaling pathways, regulation by transcription factors and hormones, meiotic progression, and changes in cell adhesion. Elucidation of mechanisms leading to formation of the primordial follicle pool will help research efforts in ovarian biology and improve treatments of female infertility, premature ovarian failure, and reproductive cancers.
Collapse
Affiliation(s)
- Melissa E Pepling
- Department of Biology, Syracuse University, Syracuse, New York 13244, USA.
| |
Collapse
|
100
|
Andersson ER, Sandberg R, Lendahl U. Notch signaling: simplicity in design, versatility in function. Development 2011; 138:3593-612. [PMID: 21828089 DOI: 10.1242/dev.063610] [Citation(s) in RCA: 698] [Impact Index Per Article: 53.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Notch signaling is evolutionarily conserved and operates in many cell types and at various stages during development. Notch signaling must therefore be able to generate appropriate signaling outputs in a variety of cellular contexts. This need for versatility in Notch signaling is in apparent contrast to the simple molecular design of the core pathway. Here, we review recent studies in nematodes, Drosophila and vertebrate systems that begin to shed light on how versatility in Notch signaling output is generated, how signal strength is modulated, and how cross-talk between the Notch pathway and other intracellular signaling systems, such as the Wnt, hypoxia and BMP pathways, contributes to signaling diversity.
Collapse
Affiliation(s)
- Emma R Andersson
- Department of Cell and Molecular Biology, Karolinska Institute, SE-171 77 Stockholm, Sweden
| | | | | |
Collapse
|