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Zepeda-Romero LC, Zenker M, Schanze D, Schanze I, Peña-Padilla C, Quezada-Salazar CA, Pacheco-Torres PA, Rivera-Montellano ML, Aguirre-Guillén RL, Bobadilla-Morales L, Corona-Rivera A, Corona-Rivera JR. Intrafamilial phenotypic variability in autosomal recessive DOCK6-related Adams-Oliver syndrome. Eur J Med Genet 2022; 65:104653. [DOI: 10.1016/j.ejmg.2022.104653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 09/15/2022] [Accepted: 10/20/2022] [Indexed: 11/03/2022]
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Thompson AP, Bitsina C, Gray JL, von Delft F, Brennan PE. RHO to the DOCK for GDP disembarking: Structural insights into the DOCK GTPase nucleotide exchange factors. J Biol Chem 2021; 296:100521. [PMID: 33684443 PMCID: PMC8063744 DOI: 10.1016/j.jbc.2021.100521] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 03/04/2021] [Accepted: 03/04/2021] [Indexed: 01/16/2023] Open
Abstract
The human dedicator of cytokinesis (DOCK) family consists of 11 structurally conserved proteins that serve as atypical RHO guanine nucleotide exchange factors (RHO GEFs). These regulatory proteins act as mediators in numerous cellular cascades that promote cytoskeletal remodeling, playing roles in various crucial processes such as differentiation, migration, polarization, and axon growth in neurons. At the molecular level, DOCK DHR2 domains facilitate nucleotide dissociation from small GTPases, a process that is otherwise too slow for rapid spatiotemporal control of cellular signaling. Here, we provide an overview of the biological and structural characteristics for the various DOCK proteins and describe how they differ from other RHO GEFs and between DOCK subfamilies. The expression of the family varies depending on cell or tissue type, and they are consequently implicated in a broad range of disease phenotypes, particularly in the brain. A growing body of available structural information reveals the mechanism by which the catalytic DHR2 domain elicits nucleotide dissociation and also indicates strategies for the discovery and design of high-affinity small-molecule inhibitors. Such compounds could serve as chemical probes to interrogate the cellular function and provide starting points for drug discovery of this important class of enzymes.
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Affiliation(s)
- Andrew P Thompson
- Nuffield Department of Medicine, Alzheimer's Research UK Oxford Drug Discovery Institute, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Target Discovery Institute, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Centre for Medicines Discovery, University of Oxford, Oxford, United Kingdom
| | - Christina Bitsina
- Nuffield Department of Medicine, Alzheimer's Research UK Oxford Drug Discovery Institute, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Target Discovery Institute, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Centre for Medicines Discovery, University of Oxford, Oxford, United Kingdom
| | - Janine L Gray
- Nuffield Department of Medicine, Alzheimer's Research UK Oxford Drug Discovery Institute, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Target Discovery Institute, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Centre for Medicines Discovery, University of Oxford, Oxford, United Kingdom
| | - Frank von Delft
- Nuffield Department of Medicine, Alzheimer's Research UK Oxford Drug Discovery Institute, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Centre for Medicines Discovery, University of Oxford, Oxford, United Kingdom; Diamond Light Source, Harwell Science and Innovation Campus, Didcot, United Kingdom; Department of Biochemistry, University of Johannesburg, Auckland Park, South Africa
| | - Paul E Brennan
- Nuffield Department of Medicine, Alzheimer's Research UK Oxford Drug Discovery Institute, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Target Discovery Institute, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Centre for Medicines Discovery, University of Oxford, Oxford, United Kingdom.
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Huang S, Yang L, Zhao L, Xu R, Wu Y. Novel In-Frame Deletion Mutation in NOTCH1 in a Chinese Sporadic Case of Adams-Oliver Syndrome. DNA Cell Biol 2020; 39:783-789. [PMID: 32129674 DOI: 10.1089/dna.2019.5200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Adams-Oliver syndrome (AOS) is a rare hereditary disorder characterized by aplasia cutis congenita (ACC) and terminal transverse limb defects. The etiology of AOS has remained largely unknown, although mutations in the notch receptor 1 (NOTCH1) gene are most common genetic alteration associated with this disease. In this study, we aimed to identify the case of a 6-year-old boy, who presented with large ACC of the scalp and aortic valve stenosis, suggesting the possibility of AOS. Whole-exome sequencing identified a novel, de novo, in-frame deletion in the NOTCH1 gene (NOTCH1 c.1292_1294del, p.Asn431del) in the patient. The p.Asn431del variant was evaluated by several in silico analyses, which predicted that the mutant was likely to be pathogenic. In addition, molecular modeling with the PyMOL Molecular Graphics System suggested that the NOTCH1-N431del destabilizes calcium ion chelation, leading to decreased receptor-ligand binding efficiency. Quantitative reverse transcription PCR showed further significant downregulation of the Notch target genes, hes-related family bHLH transcription factor with YRPW motif 1 (HEY1) and hes family bHLH transcription factor 1 (HES1), suggesting that this mutation causes disease through dysregulation of the Notch signaling pathway. Our study provides evidence that the NOTCH1-N431del mutation is responsible for this case of AOS. To our knowledge, this is the first report of a patient with AOS caused by NOTCH1 mutation in Asia, and this information will be useful for providing the family with genetic counseling that can help to guide their future plans.
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Affiliation(s)
- Suqiu Huang
- Department of Pediatric Cardiology, Shanghai Jiaotong University School of Medicine, Shanghai, P.R. China
| | - Ling Yang
- Department of Pediatric Cardiology, Shanghai Jiaotong University School of Medicine, Shanghai, P.R. China
| | - Liqing Zhao
- Department of Pediatric Cardiology, Shanghai Jiaotong University School of Medicine, Shanghai, P.R. China
| | - Rang Xu
- Scientific Research Center, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, P.R. China
| | - Yurong Wu
- Department of Pediatric Cardiology, Shanghai Jiaotong University School of Medicine, Shanghai, P.R. China
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Wehrens KM, De Jongh F, Ter Laak MP, Cornips EM, Van der Hulst R. Treatment of a Large Skull Defect and Brain Herniation in a Newborn With Adams-Oliver Syndrome. Cureus 2020; 12:e7047. [PMID: 32211278 PMCID: PMC7083258 DOI: 10.7759/cureus.7047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Adams-Oliver syndrome (AOS) is a rare congenital disorder characterised by a wide variety of clinical expression ranging from the occurrence of aplasia cutis congenita (ACC), transverse limb defects, and cutis marmorata telangiectica to extensive lethal anomalies. In this article, we present the conservative and surgical management of a male newborn infant diagnosed with AOS. Surgical treatment included wound management, the removal of protruding brain, and treatment of cerebrospinal fluid (CSF) leakage. After spontaneous reepithelization of the wounds, conservative treatment was chosen instead of reconstruction with an occipital flap; this was continued until the total healing of the dermal defect after eight months, during which the patient was continuously treated with antibiotics. At 17 months, the child was in good physical condition with a three-month development delay in comparison with infants of his age and no evidence of neurological deficit.
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Affiliation(s)
- Kim M Wehrens
- Plastic Surgery, Haaglanden Medisch Centrum, The Hague, NLD
| | - Frank De Jongh
- Plastic Surgery, Haaglanden Medisch Centrum, The Hague, NLD
| | - M P Ter Laak
- Neurosurgery, Maastricht University Medical Center, Maastricht, NLD
| | - E M Cornips
- Neurosurgery, Maastricht University Medical Center, Maastricht, NLD
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