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Bell-Cheddar Y, Devine WA, Diaz-Castrillon CE, Seese L, Castro-Medina M, Morales R, Follansbee CW, Alsaied T, Lin JHI. Double outlet right ventricle. Front Pediatr 2023; 11:1244558. [PMID: 37818164 PMCID: PMC10560996 DOI: 10.3389/fped.2023.1244558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 08/22/2023] [Indexed: 10/12/2023] Open
Abstract
This review article addresses the history, morphology, anatomy, medical management, and different surgical options for patients with double outlet right ventricle.
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Affiliation(s)
- Yolandee Bell-Cheddar
- Division of Pediatric Cardiac Critical Care, UPMC Children's Hospital of Pittsburgh , Pittsburgh, PA, United States
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | - William A. Devine
- Department of Developmental Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | | | - Laura Seese
- Department of Pediatric Cardiothoracic Surgery, UPMC Children's Hospital of Pittsburgh, Pittsburgh, PA, United States
| | - Mario Castro-Medina
- Department of Pediatric Cardiothoracic Surgery, UPMC Children's Hospital of Pittsburgh, Pittsburgh, PA, United States
| | - Raymond Morales
- Division of Pediatric Cardiac Critical Care, Children's Hospital of New Orleans, New Orleans, LA, United States
| | - Christopher W. Follansbee
- Division of Pediatric Cardiology, UPMC Children’s Hospital of Pittsburgh, Pittsburgh, PA, United States
| | - Tarek Alsaied
- Division of Pediatric Cardiology, UPMC Children’s Hospital of Pittsburgh, Pittsburgh, PA, United States
| | - Jiuann-Huey I. Lin
- Division of Pediatric Cardiac Critical Care, UPMC Children's Hospital of Pittsburgh , Pittsburgh, PA, United States
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
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Patt E, Singhania A, Roberts AE, Morton SU. The Genetics of Neurodevelopment in Congenital Heart Disease. Can J Cardiol 2023; 39:97-114. [PMID: 36183910 DOI: 10.1016/j.cjca.2022.09.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/23/2022] [Accepted: 09/25/2022] [Indexed: 02/07/2023] Open
Abstract
Congenital heart disease (CHD) is the most common birth anomaly, affecting almost 1% of infants. Neurodevelopmental delay is the most common extracardiac feature in people with CHD. Many factors may contribute to neurodevelopmental risk, including genetic factors, CHD physiology, and the prenatal/postnatal environment. Damaging variants are most highly enriched among individuals with extracardiac anomalies or neurodevelopmental delay in addition to CHD, indicating that genetic factors have an impact beyond cardiac tissues in people with CHD. Potential sources of genetic risk include large deletions or duplications that affect multiple genes, such as 22q11 deletion syndrome, single genes that alter both heart and brain development, such as CHD7, and common variants that affect neurodevelopmental resiliency, such as APOE. Increased use of genome-sequencing technologies in studies of neurodevelopmental outcomes in people with CHD will improve our ability to detect relevant genes and variants. Ultimately, such knowledge can lead to improved and more timely intervention of learning support for affected children.
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Affiliation(s)
- Eli Patt
- Harvard Medical School, Boston, Massachusetts, USA
| | - Asmita Singhania
- School of Medical Sciences, University of Manchester, Manchester, United Kingdom
| | - Amy E Roberts
- Department of Cardiology, Boston Children's Hospital, Boston, Massachusetts, USA; Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA; Division of Genetics and Genomics, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Sarah U Morton
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA; Division of Newborn Medicine, Boston Children's Hospital, Boston, Massachusetts, USA.
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Weigele J, Bohnsack BL. Genetics Underlying the Interactions between Neural Crest Cells and Eye Development. J Dev Biol 2020; 8:jdb8040026. [PMID: 33182738 PMCID: PMC7712190 DOI: 10.3390/jdb8040026] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 11/03/2020] [Accepted: 11/07/2020] [Indexed: 12/14/2022] Open
Abstract
The neural crest is a unique, transient stem cell population that is critical for craniofacial and ocular development. Understanding the genetics underlying the steps of neural crest development is essential for gaining insight into the pathogenesis of congenital eye diseases. The neural crest cells play an under-appreciated key role in patterning the neural epithelial-derived optic cup. These interactions between neural crest cells within the periocular mesenchyme and the optic cup, while not well-studied, are critical for optic cup morphogenesis and ocular fissure closure. As a result, microphthalmia and coloboma are common phenotypes in human disease and animal models in which neural crest cell specification and early migration are disrupted. In addition, neural crest cells directly contribute to numerous ocular structures including the cornea, iris, sclera, ciliary body, trabecular meshwork, and aqueous outflow tracts. Defects in later neural crest cell migration and differentiation cause a constellation of well-recognized ocular anterior segment anomalies such as Axenfeld–Rieger Syndrome and Peters Anomaly. This review will focus on the genetics of the neural crest cells within the context of how these complex processes specifically affect overall ocular development and can lead to congenital eye diseases.
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Affiliation(s)
- Jochen Weigele
- Division of Ophthalmology, Ann & Robert H. Lurie Children’s Hospital of Chicago, 225 E. Chicago Ave, Chicago, IL 60611, USA;
- Department of Ophthalmology, Northwestern University Feinberg School of Medicine, 645 N. Michigan Ave, Chicago, IL 60611, USA
| | - Brenda L. Bohnsack
- Division of Ophthalmology, Ann & Robert H. Lurie Children’s Hospital of Chicago, 225 E. Chicago Ave, Chicago, IL 60611, USA;
- Department of Ophthalmology, Northwestern University Feinberg School of Medicine, 645 N. Michigan Ave, Chicago, IL 60611, USA
- Correspondence: ; Tel.: +1-312-227-6180; Fax: +1-312-227-9411
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Pranckėnienė L, Preikšaitienė E, Gueneau L, Reymond A, Kučinskas V. De Novo Duplication in the CHD7 Gene Associated With Severe CHARGE Syndrome. GENOMICS INSIGHTS 2019; 12:1178631019839010. [PMID: 31043788 PMCID: PMC6446253 DOI: 10.1177/1178631019839010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 02/28/2019] [Indexed: 01/14/2023]
Abstract
CHARGE syndrome is an autosomal dominant developmental disorder associated with a constellation of traits involving almost every organ and sensory system, in particular congenital anomalies, including choanal atresia and malformations of the heart, inner ear, and retina. Variants in CHD7 have been shown to cause CHARGE syndrome. Here, we report the identification of a novel de novo p.Asp2119_Pro2120ins6 duplication variant in a conserved region of CHD7 in a severely affected boy presenting with 3 and 5 of the CHARGE cardinal major and minor signs, respectively, combined with congenital umbilical hernia, congenital hernia at the linea alba, mildly hypoplastic inferior vermis, slight dilatation of the lateral ventricles, prominent metopic ridge, and hypoglycemic episodes.
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Affiliation(s)
- Laura Pranckėnienė
- Department of Human and Medical Genetics, Faculty of Medicine, Institute of Biomedical Sciences, Vilnius University, Vilnius, Lithuania
| | - Eglė Preikšaitienė
- Department of Human and Medical Genetics, Faculty of Medicine, Institute of Biomedical Sciences, Vilnius University, Vilnius, Lithuania
| | - Lucie Gueneau
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Alexandre Reymond
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Vaidutis Kučinskas
- Department of Human and Medical Genetics, Faculty of Medicine, Institute of Biomedical Sciences, Vilnius University, Vilnius, Lithuania
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5
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Ungaro C, Citrigno L, Trojsi F, Sprovieri T, Gentile G, Muglia M, Monsurrò MR, Tedeschi G, Cavallaro S, Conforti FL. ALS and CHARGE syndrome: a clinical and genetic study. Acta Neurol Belg 2018; 118:629-635. [PMID: 30317490 PMCID: PMC6244742 DOI: 10.1007/s13760-018-1029-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 10/06/2018] [Indexed: 12/30/2022]
Abstract
Amyotrophic Lateral Sclerosis and CHARGE syndrome are complex neurological disorders, which never occurred together in the same family and, to date, no putative correlation between them has been described on PubMed Central. Due to our aim was to evaluate the presence of different genetic variants involved in these pathologies, we reported a clinical and genetic description of two sisters affected by these two different disorders. In the CHARGE patient, molecular analysis of the CHD7 gene revealed the c.8016G >A de novo variant in exon 37. The ALS patient had been screened negative for mutations in SOD1, TARDBP, FUS/TLS, C9orf72 and KIF5A genes. Anyway, targeted next generation sequencing analysis identified known and unknown genetic variations in 39 ALS-related genes: a total of 380 variants were reported, of which 194 in the ALS patient and 186 in the CHARGE patient. To date, although the results suggest that the occurrence of the two syndromes in the same family is co-incidental rather than based on a causative genetic variant, we could hypothesize that other factors might act as modulators in the pathogenesis of these different phenotypes.
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Affiliation(s)
- Carmine Ungaro
- Institute of Neurological Sciences (ISN), National Research Council, C.da Burga, Mangone, CS, Italy
| | - Luigi Citrigno
- Institute of Neurological Sciences (ISN), National Research Council, C.da Burga, Mangone, CS, Italy
| | - Francesca Trojsi
- Dipartimento di Scienze Mediche, Chirurgiche, Neurologiche, Metaboliche e dell'Invecchiamento, Università degli Studi della Campania "Luigi Vanvitelli", Naples, Italy
| | - Teresa Sprovieri
- Institute of Neurological Sciences (ISN), National Research Council, C.da Burga, Mangone, CS, Italy
| | - Giulia Gentile
- Institute of Neurological Sciences (ISN), National Research Council, C.da Burga, Mangone, CS, Italy
| | - Maria Muglia
- Institute of Neurological Sciences (ISN), National Research Council, C.da Burga, Mangone, CS, Italy
| | - Maria Rosaria Monsurrò
- Dipartimento di Scienze Mediche, Chirurgiche, Neurologiche, Metaboliche e dell'Invecchiamento, Università degli Studi della Campania "Luigi Vanvitelli", Naples, Italy
| | - Gioacchino Tedeschi
- Dipartimento di Scienze Mediche, Chirurgiche, Neurologiche, Metaboliche e dell'Invecchiamento, Università degli Studi della Campania "Luigi Vanvitelli", Naples, Italy
| | - Sebastiano Cavallaro
- Institute of Neurological Sciences (ISN), National Research Council, C.da Burga, Mangone, CS, Italy
| | - Francesca Luisa Conforti
- Institute of Neurological Sciences (ISN), National Research Council, C.da Burga, Mangone, CS, Italy.
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Aguiar-Oliveira MH, Davalos C, Campos VC, Oliveira Neto LA, Marinho CG, Oliveira CRP. Hypothalamic abnormalities: Growth failure due to defects of the GHRH receptor. Growth Horm IGF Res 2018; 38:14-18. [PMID: 29277338 DOI: 10.1016/j.ghir.2017.12.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 12/19/2017] [Accepted: 12/19/2017] [Indexed: 12/16/2022]
Abstract
Several acquired or congenital hypothalamic abnormalities may cause growth failure (GF). We described two of these congenital abnormalities. First, a case of CHARGE syndrome, an epigenetic disorder mostly caused by heterozygous mutations in the gene encoding CHD7, a chromatin remodeling protein, causing several malformations, some life-threatening, with additional secondary hypothalamus-hypophyseal dysfunction, including GF. Second, a cohort of individuals with genetic isolated severe GH deficiency (IGHD), due to a homozygous mutation in the GH-releasing hormone (GHRH) receptor gene described in Itabaianinha County, in northeast Brazil. In this IGHD, with marked reduction of serum concentrations of IGF-I, and an up regulation of IGF-II, GF is the principal finding in otherwise normal subjects, with normal quality of life and longevity. This IGHD may unveil the effects of GHRH, pituitary GH and IGF-I, IGF-II and local GH and growth factor on the size and function of body and several systems. For instance, anterior pituitary hypoplasia, and impairment of the non-REM sleep may be due to GHRH resistance. Proportionate short stature, doll facies, high-pitched pre-pubertal voice, and reduced muscle mass reflect the lack of the synergistic effect of pituitary GH and IGF-I in bones and muscles. Central adiposity may be due to a direct effect of the lack of GH. Brain, eyes and immune system may also involve IGF-II and local GH or growth factors. A concept of physiological hierarchy controlling body size and function by each component of the GH system may be drawn from this model.
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Affiliation(s)
- Manuel H Aguiar-Oliveira
- Division of Endocrinology, Department of Medicine, Federal University of Sergipe, 49060-100, Aracaju, Sergipe, Brazil.
| | - Caridad Davalos
- Division of Pediatrics, Pediatric Critical Care, Hospital Pediatrico Baca Ortiz, Universidad San Francisco de Quito, 1712-841 Quito, Ecuador
| | - Viviane C Campos
- Division of Endocrinology, Department of Medicine, Federal University of Sergipe, 49060-100, Aracaju, Sergipe, Brazil
| | - Luiz A Oliveira Neto
- Department of Orthodontics, School of Dentistry, Federal University of Sergipe, 49060-100 Aracaju, Sergipe, Brazil
| | - Cindi G Marinho
- Division of Endocrinology, Department of Medicine, Federal University of Sergipe, 49060-100, Aracaju, Sergipe, Brazil
| | - Carla R P Oliveira
- Division of Endocrinology, Department of Medicine, Federal University of Sergipe, 49060-100, Aracaju, Sergipe, Brazil
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7
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Yi J, Wu J. Epigenetic regulation in medulloblastoma. Mol Cell Neurosci 2017; 87:65-76. [PMID: 29269116 DOI: 10.1016/j.mcn.2017.09.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Revised: 09/08/2017] [Accepted: 09/10/2017] [Indexed: 12/14/2022] Open
Abstract
Medulloblastoma is the most common malignant childhood brain tumor. The heterogeneous tumors are classified into four subgroups based on transcription profiles. Recent developments in genome-wide sequencing techniques have rapidly advanced the understanding of these tumors. The high percentages of somatic alterations of genes encoding chromatin regulators in all subgroups suggest that epigenetic deregulation is a major driver of medulloblastoma. In this report, we review the current understanding of epigenetic regulation in medulloblastoma with a focus on the functional studies of chromatin regulators in the initiation and progression of specific subgroups of medulloblastoma. We also discuss the potential usage of epigenetic inhibitors for medulloblastoma treatment.
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Affiliation(s)
- Jiaqing Yi
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9040, USA
| | - Jiang Wu
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9040, USA.
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Pauli S, Bajpai R, Borchers A. CHARGEd with neural crest defects. AMERICAN JOURNAL OF MEDICAL GENETICS PART C-SEMINARS IN MEDICAL GENETICS 2017; 175:478-486. [PMID: 29082625 DOI: 10.1002/ajmg.c.31584] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 08/23/2017] [Accepted: 08/31/2017] [Indexed: 12/15/2022]
Abstract
Neural crest cells are highly migratory pluripotent cells that give rise to diverse derivatives including cartilage, bone, smooth muscle, pigment, and endocrine cells as well as neurons and glia. Abnormalities in neural crest-derived tissues contribute to the etiology of CHARGE syndrome, a complex malformation disorder that encompasses clinical symptoms like coloboma, heart defects, atresia of the choanae, retarded growth and development, genital hypoplasia, ear anomalies, and deafness. Mutations in the chromodomain helicase DNA-binding protein 7 (CHD7) gene are causative of CHARGE syndrome and loss-of-function data in different model systems have firmly established a role of CHD7 in neural crest development. Here, we will summarize our current understanding of the function of CHD7 in neural crest development and discuss possible links of CHARGE syndrome to other developmental disorders.
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Affiliation(s)
- Silke Pauli
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany
| | - Ruchi Bajpai
- Center for Craniofacial Molecular Biology, Ostrow School of Dentistry and Department of Biochemistry and Molecular Biology, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Annette Borchers
- Department of Biology, Molecular Embryology, Philipps-University Marburg, Marburg, Germany
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CHARGE and Kabuki Syndromes: Gene-Specific DNA Methylation Signatures Identify Epigenetic Mechanisms Linking These Clinically Overlapping Conditions. Am J Hum Genet 2017; 100:773-788. [PMID: 28475860 PMCID: PMC5420353 DOI: 10.1016/j.ajhg.2017.04.004] [Citation(s) in RCA: 130] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 04/06/2017] [Indexed: 01/13/2023] Open
Abstract
Epigenetic dysregulation has emerged as a recurring mechanism in the etiology of neurodevelopmental disorders. Two such disorders, CHARGE and Kabuki syndromes, result from loss of function mutations in chromodomain helicase DNA-binding protein 7 (CHD7LOF) and lysine (K) methyltransferase 2D (KMT2DLOF), respectively. Although these two syndromes are clinically distinct, there is significant phenotypic overlap. We therefore expected that epigenetically driven developmental pathways regulated by CHD7 and KMT2D would overlap and that DNA methylation (DNAm) alterations downstream of the mutations in these genes would identify common target genes, elucidating a mechanistic link between these two conditions, as well as specific target genes for each disorder. Genome-wide DNAm profiles in individuals with CHARGE and Kabuki syndromes with CHD7LOF or KMT2DLOF identified distinct sets of DNAm differences in each of the disorders, which were used to generate two unique, highly specific and sensitive DNAm signatures. These DNAm signatures were able to differentiate pathogenic mutations in these two genes from controls and from each other. Analysis of the DNAm targets in each gene-specific signature identified both common gene targets, including homeobox A5 (HOXA5), which could account for some of the clinical overlap in CHARGE and Kabuki syndromes, as well as distinct gene targets. Our findings demonstrate how characterization of the epigenome can contribute to our understanding of disease pathophysiology for epigenetic disorders, paving the way for explorations of novel therapeutics.
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10
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Abstract
Macrophage migration inhibitory factor (MIF) plays an important role in supporting the proliferation and/or survival of murine neural stem/progenitor cells (NSPCs); however, the downstream effectors of this factor remain unknown. Here, we show that MIF increases the expression of Pax6 and Chd7 in NSPCs in vitro. During neural development, the chromatin remodeling factor Chd7 (chromatin helicase-DNA-binding protein 7) is expressed in the ventricular zone of the telencephalon of mouse brain at embryonic day 14.5, as well as in cultured NSPCs. Retroviral overexpression of Pax6 in NSPCs increased Chd7 gene expression. Lentivirally-expressed Chd7 shRNA suppressed cell proliferation and neurosphere formation, and inhibited neurogenesis in vitro, while decreasing gene expression of Hes5 and N-myc. In addition, CHD7 overexpression increased cell proliferation in human embryonic stem cell-derived NSPCs (ES-NSPCs). In Chd7 mutant fetal mouse brains, there were fewer intermediate progenitor cells (IPCs) compared to wildtype littermates, indicating that Chd7 contributes to neurogenesis in the early developmental mouse brain. Furthermore, in silico database analysis showed that, among members of the CHD family, CHD7 is highly expressed in human gliomas. Interestingly, high levels of CHD7 gene expression in human glioma initiating cells (GICs) compared to normal astrocytes were revealed and gene silencing of CHD7 decreased GIC proliferation. Collectively, our data demonstrate that CHD7 is an important factor in the proliferation and stemness maintenance of NSPCs, and CHD7 is a promising therapeutic target for the treatment of gliomas.
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Bird JE, Barzik M, Drummond MC, Sutton DC, Goodman SM, Morozko EL, Cole SM, Boukhvalova AK, Skidmore J, Syam D, Wilson EA, Fitzgerald T, Rehman AU, Martin DM, Boger ET, Belyantseva IA, Friedman TB. Harnessing molecular motors for nanoscale pulldown in live cells. Mol Biol Cell 2016; 28:463-475. [PMID: 27932498 PMCID: PMC5341729 DOI: 10.1091/mbc.e16-08-0583] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 11/08/2016] [Accepted: 11/29/2016] [Indexed: 11/13/2022] Open
Abstract
Nanoscale pulldown (NanoSPD) miniaturizes the concept of affinity pulldown to detect protein–protein interactions in live cells. NanoSPD hijacks the myosin-based intracellular trafficking machinery to assess interactions under physiological buffer conditions and is microscopy-based, allowing for sensitive detection and quantification. Protein–protein interactions (PPIs) regulate assembly of macromolecular complexes, yet remain challenging to study within the native cytoplasm where they normally exert their biological effect. Here we miniaturize the concept of affinity pulldown, a gold-standard in vitro PPI interrogation technique, to perform nanoscale pulldowns (NanoSPDs) within living cells. NanoSPD hijacks the normal process of intracellular trafficking by myosin motors to forcibly pull fluorescently tagged protein complexes along filopodial actin filaments. Using dual-color total internal reflection fluorescence microscopy, we demonstrate complex formation by showing that bait and prey molecules are simultaneously trafficked and actively concentrated into a nanoscopic volume at the tips of filopodia. The resulting molecular traffic jams at filopodial tips amplify fluorescence intensities and allow PPIs to be interrogated using standard epifluorescence microscopy. A rigorous quantification framework and software tool are provided to statistically evaluate NanoSPD data sets. We demonstrate the capabilities of NanoSPD for a range of nuclear and cytoplasmic PPIs implicated in human deafness, in addition to dissecting these interactions using domain mapping and mutagenesis experiments. The NanoSPD methodology is extensible for use with other fluorescent molecules, in addition to proteins, and the platform can be easily scaled for high-throughput applications.
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Affiliation(s)
- Jonathan E Bird
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Melanie Barzik
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Meghan C Drummond
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Daniel C Sutton
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Spencer M Goodman
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Eva L Morozko
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Stacey M Cole
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | | | - Jennifer Skidmore
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109
| | - Diana Syam
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109
| | - Elizabeth A Wilson
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Tracy Fitzgerald
- Mouse Auditory Testing Core Facility, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20814
| | - Atteeq U Rehman
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Donna M Martin
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109.,Department of Human Genetics, University of Michigan, Ann Arbor, MI 48109
| | - Erich T Boger
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Inna A Belyantseva
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
| | - Thomas B Friedman
- Laboratory of Molecular Genetics, National Institutes of Health, Bethesda, MD 20814
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12
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Gage PJ, Hurd EA, Martin DM. Mouse Models for the Dissection of CHD7 Functions in Eye Development and the Molecular Basis for Ocular Defects in CHARGE Syndrome. Invest Ophthalmol Vis Sci 2016; 56:7923-30. [PMID: 26670829 DOI: 10.1167/iovs.15-18069] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
PURPOSE CHARGE syndrome (Coloboma of the eye, Heart defects, Atresia of the choanae, Retardation of growth and/or development, Genital and/or urinary tract abnormalities, and Ear abnormalities and deafness) is the second-leading cause of deaf-blindness after Usher syndrome. Heterozygous mutations in CHD7 cause CHARGE syndrome in 70% to 90% of patients. We tested the hypothesis that tissue-specific mutant mice provide models for molecularly dissecting CHD7 functions during eye development. METHODS The conditional Chd7flox allele was mated together with tissue-specific Cre transgenes. Immunohistochemistry was used to determine the normal CHD7 pattern in the early eye primordia and to assess Chd7 mutants for expression of region-specific protein markers. RESULTS CHD7 is present in the neural ectoderm and surface ectoderm of the eye. Deletion from neural and surface ectoderm results in severely dysmorphic eyes generally lacking recognizable optic cup structures and small lenses. Deletion from the neural ectoderm results in similar defects. Deletion from the surface ectoderm results in eyes with smaller lenses. Lens tissue and the major subdivisions of the neural ectoderm are present following conditional deletion of Chd7 from the neural ectoderm. Closure of the optic fissure depends on the Chd7 gene dose within the neural ectoderm. CONCLUSIONS Eye development requires CHD7 in multiple embryonic tissues. Lens development requires CHD7 in the surface ectoderm, whereas optic cup and stalk morphogenesis require CHD7 in the neural ectoderm. CHD7 is not absolutely required for specification of the major subdivisions within the neural ectoderm. As in humans, normal eye development in mice is sensitive to Chd7 haploinsufficiency. These data indicate the Chd7 mutant mice are models for determining the molecular etiology of ocular defects in CHARGE syndrome.
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Affiliation(s)
- Philip J Gage
- Department of Ophthalmology and Visual Science, University of Michigan Medical School, Ann Arbor, Michigan, United States 2Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Elizabeth A Hurd
- Department of Pediatrics, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Donna M Martin
- Department of Pediatrics, University of Michigan Medical School, Ann Arbor, Michigan, United States 4Department of Human Genetics, University of Michigan Medical School, Ann Arbor, Michigan, United States
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Abstract
Hearing loss (HL) is one of the most common birth defects in developed countries and is a diverse pathologic condition with different classifications. One of these is based on the association with other clinical features, defined as syndromic hearing loss (SHL). Determining the cause of the HL in these patients is extremely beneficial as it enables a personalized approach to caring for the individual. Early screening can further aid in optimal rehabilitation for a child's development and growth. The advancement of high-throughput sequencing technology is facilitating rapid and low-cost diagnostics for patients with SHL.
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Affiliation(s)
- Tal Koffler
- Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Kathy Ushakov
- Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Karen B Avraham
- Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv 6997801, Israel.
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