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Albakheet A, Almuallami D, Almass R, Qari A, Kenana R, AlQudairy H, Huma R, Binomar H, Wakil SM, Alowain M, Colak D, Kaya N, AlSayed MD. Novel UBE3B mutations: report of eight patients with Kaufman oculocerebrofacial syndrome with additional clinical findings from a highly consanguineous population. Clin Dysmorphol 2024; 33:55-62. [PMID: 38410982 DOI: 10.1097/mcd.0000000000000486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
Biallelic mutations in UBE3B cause Kaufman oculocerebrofacial syndrome (KOS; OMIM 244450) with a wide range of clinical manifestations. In this study, we employed genetic analyses including homozygosity mapping, candidate gene sequencing, whole exome sequencing, and confirmatory Sanger sequencing on eight patients from three unrelated consanguineous families. Our analysis yielded three different novel variants in UBE3B : a missense substitution [NM_130466.4: c.2975C>T; (p.Pro992Leu)] in the HECT domain in family 1, a 3-bp deletion within exon 14 [c.1692_1694delCTC; (p.Ser565del)] leading to removal of a serine residue in family 2, and a splice donor site variant in intron eight of UBE3B (c.630 + 1G>T) in family 3. Blepharophimosis, telecanthus, ptosis, intellectual disability and abnormal lipid profile were similar to those found in previously reported KOS patients. Longitudinal follow-up revealed rather marfanoid body habitus of the patients in family 1. This study reports eight patients from Saudi Arabia with novel deleterious variants in UBE3B and adds to the phenotypic spectrum of KOS.
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Affiliation(s)
| | | | - Rawan Almass
- Medical Genomics Department, Center for Genomic Medicine
| | - Alya Qari
- Medical Genomics Department, Center for Genomic Medicine
| | - Rosan Kenana
- Translational Genomics Department, Center for Genomic Medicine
| | - Hanan AlQudairy
- Translational Genomics Department, Center for Genomic Medicine
| | - Rozeena Huma
- Clinical Studies and Empirical Ethics Department, King Faisal Specialist Hospital and Research Center (KFSHRC), Riyadh, Kingdom of Saudi Arabia
| | - Hadeel Binomar
- Medical Genomics Department, Center for Genomic Medicine
| | - Salma Majid Wakil
- Laboratory of Neurogenetics, National Institutes of Health, Rockville, Maryland, USA
| | | | - Dilek Colak
- Molecular Oncology Department, KFSHRC, Riyadh, Kingdom of Saudi Arabia
| | - Namik Kaya
- Translational Genomics Department, Center for Genomic Medicine
| | - Moeenaldeen D AlSayed
- Medical Genomics Department, Center for Genomic Medicine
- College of Medicine, Alfaisal University, Riyadh, Kingdom of Saudi Arabia
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2
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Fida M, Sinan I, Finan A. Whole Exome Sequencing Achieved a Definite Diagnosis of Kaufman Oculocerebrofacial Syndrome in a Bahraini Family: A Case Report. Clin Med Insights Pediatr 2023; 17:11795565231200130. [PMID: 37745637 PMCID: PMC10515509 DOI: 10.1177/11795565231200130] [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] [Received: 04/11/2023] [Accepted: 08/22/2023] [Indexed: 09/26/2023] Open
Abstract
A 1 year and 7 months old girl presented to the medical genetic clinic as a referral from the pediatrics clinic. Upon examining the patient and assessing past medical history, an autosomal recessive disorder was suspected. The family underwent whole exome sequencing, which resulted in the diagnosis of Kaufman oculocerebrofacial syndrome (OMIM #244450) in the patient due to the fact that both parents were heterozygous carriers of a novel pathogenic variant in the gene UBE3B that lies on 12q24. It has been recommended for the family that preimplantation genetic testing should be considered for future pregnancies. In this case report, we present a novel variant of the gene and highlight the support of whole exome sequencing in the unveiling of genetic disorders.
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Affiliation(s)
- Mariam Fida
- Consultant, Medical Genetics, Bahrain Oncology Centre, Muharraq, Kingdom of Bahrain
| | - Israa Sinan
- Education and Proficiency Centre, King Hamad University Hospital, Muharraq, Kingdom of Bahrain
| | - Alan Finan
- Consultant, Department of Pediatrics, King Hamad University Hospital, Muharraq, Kingdom of Bahrain
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3
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Ambrozkiewicz MC, Borisova E, Schwark M, Ripamonti S, Schaub T, Smorodchenko A, Weber AI, Rhee HJ, Altas B, Yilmaz R, Mueller S, Piepkorn L, Horan ST, Straussberg R, Zaqout S, Jahn O, Dere E, Rosário M, Boehm-Sturm P, Borck G, Willig KI, Rhee J, Tarabykin V, Kawabe H. The murine ortholog of Kaufman oculocerebrofacial syndrome protein Ube3b regulates synapse number by ubiquitinating Ppp3cc. Mol Psychiatry 2021; 26:1980-1995. [PMID: 32249816 DOI: 10.1038/s41380-020-0714-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 02/21/2020] [Accepted: 03/11/2020] [Indexed: 12/11/2022]
Abstract
Kaufman oculocerebrofacial syndrome (KOS) is a severe autosomal recessive disorder characterized by intellectual disability, developmental delays, microcephaly, and characteristic dysmorphisms. Biallelic mutations of UBE3B, encoding for a ubiquitin ligase E3B are causative for KOS. In this report, we characterize neuronal functions of its murine ortholog Ube3b and show that Ube3b regulates dendritic branching in a cell-autonomous manner. Moreover, Ube3b knockout (KO) neurons exhibit increased density and aberrant morphology of dendritic spines, altered synaptic physiology, and changes in hippocampal circuit activity. Dorsal forebrain-specific Ube3b KO animals show impaired spatial learning, altered social interactions, and repetitive behaviors. We further demonstrate that Ube3b ubiquitinates the catalytic γ-subunit of calcineurin, Ppp3cc, the overexpression of which phenocopies Ube3b loss with regard to dendritic spine density. This work provides insights into the molecular pathologies underlying intellectual disability-like phenotypes in a genetically engineered mouse model.
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Affiliation(s)
- Mateusz C Ambrozkiewicz
- Department of Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany. .,International Max Planck Research School for Neurosciences, Georg-August-Universität Göttingen, Griesebachstr. 5, 37077, Göttingen, Germany. .,Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany.
| | - Ekaterina Borisova
- Institute of Neuroscience, Lobachevsky University of Nizhny Novgorod, pr. Gagarina 24, Nizhny Novgorod, Russian Federation
| | - Manuela Schwark
- Department of Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany
| | - Silvia Ripamonti
- Department of Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany
| | - Theres Schaub
- Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Alina Smorodchenko
- Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - A Ioana Weber
- Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Hong Jun Rhee
- Department of Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany
| | - Bekir Altas
- Department of Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany.,International Max Planck Research School for Neurosciences, Georg-August-Universität Göttingen, Griesebachstr. 5, 37077, Göttingen, Germany
| | - Rüstem Yilmaz
- Center for Rare Diseases (ZSE Ulm), Ulm University Hospital, Eythstraße 24, 89075, Ulm, Germany
| | - Susanne Mueller
- Department of Experimental Neurology and Center for Stroke Research, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany.,NeuroCure Cluster of Excellence and Charité Core Facility 7T Experimental MRIs, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Lars Piepkorn
- Proteomics Group, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany
| | - Stephen T Horan
- Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Rachel Straussberg
- Institute of Child Neurology, Schneider's Children Medical Center, Petah Tikvah, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv-Yafo, Israel
| | - Sami Zaqout
- Basic Medical Science Department, College of Medicine, QU Health, Qatar University, Doha, Qatar
| | - Olaf Jahn
- Proteomics Group, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany
| | - Ekrem Dere
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany
| | - Marta Rosário
- Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Philipp Boehm-Sturm
- Department of Experimental Neurology and Center for Stroke Research, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany.,NeuroCure Cluster of Excellence and Charité Core Facility 7T Experimental MRIs, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Guntram Borck
- Center for Rare Diseases (ZSE Ulm), Ulm University Hospital, Eythstraße 24, 89075, Ulm, Germany
| | - Katrin I Willig
- Center for Nanoscale Microscopy and Molecular Physiology of the Brain, University Medical Center Göttingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany.,Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - JeongSeop Rhee
- Department of Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany
| | - Victor Tarabykin
- Institute of Cell Biology and Neurobiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany.,Institute of Neuroscience, Lobachevsky University of Nizhny Novgorod, pr. Gagarina 24, Nizhny Novgorod, Russian Federation
| | - Hiroshi Kawabe
- Department of Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075, Göttingen, Germany. .,Division of Pathogenetic Signaling, Department of Biochemistry and Molecular Biology, Kobe University Graduate School of Medicine, 1-5-6 Minatojima-minamimachi, Chuo-ku, Kobe, 650-0047, Japan. .,Department of Gerontology, Laboratory of Molecular Life Science, Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation at Kobe, 2-2 Minatojima-minamimachi Chuo-ku, Kobe, 650-0047, Japan.
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4
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Kawabe H, Stegmüller J. The role of E3 ubiquitin ligases in synapse function in the healthy and diseased brain. Mol Cell Neurosci 2021; 112:103602. [DOI: 10.1016/j.mcn.2021.103602] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 01/06/2021] [Accepted: 02/02/2021] [Indexed: 02/08/2023] Open
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5
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Zaki MS, Otaify GA, Ismail S, Issa MY, El-Ruby MO, Sadek AA, Ashaat EA, El Saeidi SA, Aglan MS, Temtamy S, Abdel-Hamid MS. Blepharophimosis-ptosis-intellectual disability syndrome: A report of nine Egyptian patients with further expansion of phenotypic and mutational spectrum. Am J Med Genet A 2020; 182:2857-2866. [PMID: 32949109 DOI: 10.1002/ajmg.a.61857] [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] [Received: 06/24/2020] [Revised: 08/19/2020] [Accepted: 08/21/2020] [Indexed: 12/22/2022]
Abstract
Blepharophimosis-ptosis-intellectual disability syndrome (BPID) is an extremely rare recognizable blepharophimosis intellectual disability syndrome (BID). It is caused by biallelic variants in the UBE3B gene with only 24 patients described worldwide. Herein, we report on the clinical, brain imaging and molecular findings of additional nine patients from six unrelated Egyptian families. Patients presented with the characteristic features of the syndrome including blepharophimosis, ptosis, upslanted palpebral fissures with epicanthic folds, hypertelorism, long philtrum, high arched palate, micrognathia, microcephaly, and intellectual disability. Other findings were congenital heart disease (5 patients), talipes equinovarus (5 patients), genital anomalies (5 patients), autistic features (4 patients), cleft palate (2 patients), hearing loss (2 patients), and renal anomalies (1 patient). New or rarely reported findings were spherophakia, subvalvular aortic stenosis and hypoplastic nails, and terminal phalanges. Brain MRI, performed for 7 patients, showed hypogenesis or almost complete agenesis of corpus callosum. Genetic studies revealed five novel homozygous UBE3B variants. Of them, the c.1076G>A (p.W359*) was found in three patients from two unrelated families who shared similar haplotype suggesting a likely founder effect. Our results strengthen the clinical, dysmorphic, and brain imaging characteristic of this unique type of BID and extend the mutational spectrum associated with the disorder.
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Affiliation(s)
- Maha S Zaki
- Department of Clinical Genetics, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Ghada A Otaify
- Department of Clinical Genetics, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Samira Ismail
- Department of Clinical Genetics, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Mahmoud Y Issa
- Department of Clinical Genetics, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Mona O El-Ruby
- Department of Clinical Genetics, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Abdelrahim A Sadek
- Department of Pediatric Neurology, Faculty of Medicine, Sohag University, Sohag, Egypt
| | - Engy A Ashaat
- Department of Clinical Genetics, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Sonia A El Saeidi
- Department of Pediatric Cardiology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Mona S Aglan
- Department of Clinical Genetics, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Samia Temtamy
- Department of Clinical Genetics, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Mohamed S Abdel-Hamid
- Medical Molecular Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
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6
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Wang Y, Argiles-Castillo D, Kane EI, Zhou A, Spratt DE. HECT E3 ubiquitin ligases - emerging insights into their biological roles and disease relevance. J Cell Sci 2020; 133:133/7/jcs228072. [PMID: 32265230 DOI: 10.1242/jcs.228072] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Homologous to E6AP C-terminus (HECT) E3 ubiquitin ligases play a critical role in various cellular pathways, including but not limited to protein trafficking, subcellular localization, innate immune response, viral infections, DNA damage responses and apoptosis. To date, 28 HECT E3 ubiquitin ligases have been identified in humans, and recent studies have begun to reveal how these enzymes control various cellular pathways by catalyzing the post-translational attachment of ubiquitin to their respective substrates. New studies have identified substrates and/or interactors with different members of the HECT E3 ubiquitin ligase family, particularly for E6AP and members of the neuronal precursor cell-expressed developmentally downregulated 4 (NEDD4) family. However, there still remains many unanswered questions about the specific roles that each of the HECT E3 ubiquitin ligases have in maintaining cellular homeostasis. The present Review discusses our current understanding on the biological roles of the HECT E3 ubiquitin ligases in the cell and how they contribute to disease development. Expanded investigations on the molecular basis for how and why the HECT E3 ubiquitin ligases recognize and regulate their intracellular substrates will help to clarify the biochemical mechanisms employed by these important enzymes in ubiquitin biology.
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Affiliation(s)
- Yaya Wang
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, Shanxi, China 710054.,Gustaf H. Carlson School of Chemistry and Biochemistry, Clark University, 950 Main St., Worcester, MA 01610, USA
| | - Diana Argiles-Castillo
- Gustaf H. Carlson School of Chemistry and Biochemistry, Clark University, 950 Main St., Worcester, MA 01610, USA
| | - Emma I Kane
- Gustaf H. Carlson School of Chemistry and Biochemistry, Clark University, 950 Main St., Worcester, MA 01610, USA
| | - Anning Zhou
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, Shanxi, China 710054
| | - Donald E Spratt
- Gustaf H. Carlson School of Chemistry and Biochemistry, Clark University, 950 Main St., Worcester, MA 01610, USA
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7
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Total anomalous pulmonary venous drainage in association with Kaufman syndrome. PROGRESS IN PEDIATRIC CARDIOLOGY 2020. [DOI: 10.1016/j.ppedcard.2019.101165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Further phenotypic characterization of Kaufman oculocerebrofacial syndrome: report of five new cases and literature review. Clin Dysmorphol 2020; 28:175-183. [PMID: 31162149 DOI: 10.1097/mcd.0000000000000282] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Kaufman oculocerebrofacial syndrome is a rare autosomal recessive disorder caused by biallelic variants in UBE3B. Kaufman oculocerebrofacial syndrome is characterized by a recognizable pattern of malformations including moderate to severe intellectual disability, growth deficiency, microcephaly and a distinctive facial gestalt. Common craniofacial features include short upslanting palpebral fissures, blepharophimosis or ptosis, ear anomalies, hearing loss, palate anomalies and stridor/laryngomalacia. The aim of this study was to describe the phenotypic features and the genotype of five new individuals from three unrelated families, and to review systematically the published information of 26 cases. The main features are summarized contributing to further characterize the natural history of the disease. Novel phenotypic features and two novel pathogenic variants in UBE3B are reported: A splice site variant (c.2569-1G > C) and a nonsense variant (c.518C > A, p.Ser173Ter). Kaufman oculocerebrofacial syndrome is likely an underdiagnosed disorder which can be clinically recognized based on its distinctive facial gestalt and relatively homogenous natural history.
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9
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The ubiquitin ligase UBE3B, disrupted in intellectual disability and absent speech, regulates metabolic pathways by targeting BCKDK. Proc Natl Acad Sci U S A 2019; 116:3662-3667. [PMID: 30808755 DOI: 10.1073/pnas.1818751116] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Kaufman oculocerebrofacial syndrome (KOS) is a recessive neurodevelopmental disorder characterized by intellectual disability and lack of speech. KOS is caused by inactivating mutations in UBE3B, but the underlying biological mechanisms are completely unknown. We found that loss of Ube3b in mice resulted in growth retardation, decreased grip strength, and loss of vocalization. The brains of Ube3b -/- mice had hypoplasia of the corpus callosum, enlarged ventricles, and decreased thickness of the somatosensory cortex. Ube3b -/- cortical neurons had abnormal dendritic morphology and synapses. We identified 22 UBE3B interactors and found that branched-chain α-ketoacid dehydrogenase kinase (BCKDK) is an in vivo UBE3B substrate. Since BCKDK targets several metabolic pathways, we profiled plasma and cortical metabolomes from Ube3b -/- mice. Nucleotide metabolism and the tricarboxylic acid cycle were among the pathways perturbed. Substrate-induced mitochondrial respiration was reduced in skeletal muscle but not in liver of Ube3b -/- mice. To assess the relevance of these findings to humans, we identified three KOS patients who had compound heterozygous UBE3B mutations. We discovered changes in metabolites from similar pathways in plasma from these patients. Collectively, our results implicate a disease mechanism in KOS, suggest that it is a metabolic encephalomyopathy, and provide an entry to targeted therapies.
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10
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Yilmaz R, Szakszon K, Altmann A, Altunoglu U, Senturk L, McGuire M, Calabrese O, Madan-Khetarpal S, Basel-Vanagaite L, Borck G. Kaufman oculocerebrofacial syndrome: Novel UBE3B mutations and clinical features in four unrelated patients. Am J Med Genet A 2017; 176:187-193. [PMID: 29160006 DOI: 10.1002/ajmg.a.38538] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 08/23/2017] [Accepted: 10/15/2017] [Indexed: 02/01/2023]
Abstract
The "blepharophimosis-mental retardation" syndromes (BMRS) consist of a group of clinically and genetically heterogeneous congenital malformation syndromes, where short palpebral fissures and intellectual disability associate with a distinct set of other morphological features. Kaufman oculocerebrofacial syndrome represents a rare and recently reevaluated entity within the BMR syndromes and is caused by biallelic mutations of UBE3B. Affected individuals typically show microcephaly, impaired somatic growth, gastrointestinal and genitourinary problems, ectodermal anomalies and a characteristic face with short, upslanted palpebral fissures, depressed nasal bridge. and anteverted nares. Here we present four patients with five novel UBE3B mutations and propose the inclusion of clinical features to the characteristics of Kaufman oculocerebrofacial syndrome, including prominence of the cheeks and limb anomalies.
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Affiliation(s)
- Rüstem Yilmaz
- Institute of Human Genetics, University of Ulm, Ulm, Germany.,International Graduate School in Molecular Medicine Ulm, University of Ulm, Ulm, Germany
| | - Katalin Szakszon
- Faculty of Medicine, Institute of Pediatrics, University of Debrecen, Debrecen, Hungary
| | - Anna Altmann
- St. John Hospital Buda Children's Hospital, Epilepsy Center, Budapest, Hungary
| | - Umut Altunoglu
- Medical Genetics Department, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - Leyli Senturk
- Medical Genetics Department, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | | | | | | | - Lina Basel-Vanagaite
- The Raphael Recanati Genetic Institute, Rabin Medical Center, Petach Tikva, Israel.,Pediatric Genetics Unit, Schneider Children's Medical Center of Israel, Petach Tikva, Israel.,Felsenstein Medical Research Center, Rabin Medical Center, Petach Tikva, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Guntram Borck
- Institute of Human Genetics, University of Ulm, Ulm, Germany
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11
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Kariminejad A, Ajeawung NF, Bozorgmehr B, Dionne-Laporte A, Molidperee S, Najafi K, Gibbs RA, Lee BH, Hennekam RC, Campeau PM. Kaufman oculo-cerebro-facial syndrome in a child with small and absent terminal phalanges and absent nails. J Hum Genet 2016; 62:465-471. [PMID: 28003643 PMCID: PMC5370204 DOI: 10.1038/jhg.2016.151] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 11/04/2016] [Accepted: 11/07/2016] [Indexed: 01/25/2023]
Abstract
Background Kaufman oculo-cerebro-facial syndrome (KOS) is caused by recessive UBE3B mutations and presents with microcephaly, ocular abnormalities, distinctive facial morphology, low cholesterol levels and intellectual disability. We describe a child with microcephaly, brachycephaly, hearing loss, ptosis, blepharophimosis, hypertelorism, cleft palate, multiple renal cysts, absent nails, small or absent terminal phalanges, absent speech and intellectual disability. Syndromes which were initially considered include DOORS syndrome, Coffin-Siris syndrome and Dubowitz syndrome. Methods Clinical investigations coupled with, karyotype analysis, array-CGH, exome and Sanger sequencing were performed to characterize the condition in this child. Results Sanger sequencing was negative for the DOORS syndrome gene TBC1D24 but exome sequencing identified a homozygous deletion in UBE3B (NM_183415:c.3139_3141del, p.1047_1047del) located within the terminal portion of the HECT domain. This finding coupled with the presence of characteristic features such as brachycephaly, ptosis, blepharophimosis, hypertelorism, short palpebral fissures, cleft palate and developmental delay, allowed us to make a diagnosis of KOS. Conclusion Our findings highlight the importance of considering KOS as a differential diagnosis for patients under evaluation for DOORS syndrome and expand the phenotype of KOS to include small or absent terminal phalanges, nails, and the presence of hallux varus and multicystic dysplastic kidneys.
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Affiliation(s)
| | | | - Bita Bozorgmehr
- Kariminejad-Najmabadi Pathology & Genetics Center, Tehran, Iran
| | | | - Sirinart Molidperee
- CHU-Sainte Justine Research Centre, University of Montreal, Montreal, Quebec, Canada
| | - Kimia Najafi
- Kariminejad-Najmabadi Pathology & Genetics Center, Tehran, Iran
| | - Richard A Gibbs
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX, USA
| | - Brendan H Lee
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Raoul C Hennekam
- Department of Pediatrics, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Philippe M Campeau
- CHU-Sainte Justine Research Centre, University of Montreal, Montreal, Quebec, Canada.,Department of Pediatrics, University of Montreal, Montreal, Quebec, Canada
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12
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Braganza A, Li J, Zeng X, Yates NA, Dey NB, Andrews J, Clark J, Zamani L, Wang XH, St Croix C, O'Sullivan R, Garcia-Exposito L, Brodsky JL, Sobol RW. UBE3B Is a Calmodulin-regulated, Mitochondrion-associated E3 Ubiquitin Ligase. J Biol Chem 2016; 292:2470-2484. [PMID: 28003368 DOI: 10.1074/jbc.m116.766824] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Indexed: 11/06/2022] Open
Abstract
Recent genome-wide studies found that patients with hypotonia, developmental delay, intellectual disability, congenital anomalies, characteristic facial dysmorphic features, and low cholesterol levels suffer from Kaufman oculocerebrofacial syndrome (KOS, also reported as blepharophimosis-ptosis-intellectual disability syndrome). The primary cause of KOS is autosomal recessive mutations in the gene UBE3B However, to date, there are no studies that have determined the cellular or enzymatic function of UBE3B. Here, we report that UBE3B is a mitochondrion-associated protein with homologous to the E6-AP Cterminus (HECT) E3 ubiquitin ligase activity. Mutating the catalytic cysteine (C1036A) or deleting the entire HECT domain (amino acids 758-1068) results in loss of UBE3B's ubiquitylation activity. Knockdown of UBE3B in human cells induces changes in mitochondrial morphology and physiology, a decrease in mitochondrial volume, and a severe suppression of cellular proliferation. We also discovered that UBE3B interacts with calmodulin via its N-terminal isoleucine-glutamine (IQ) motif. Deletion of the IQ motif (amino acids 29-58) results in loss of calmodulin binding and a significant increase in the in vitro ubiquitylation activity of UBE3B. In addition, we found that changes in calcium levels in vitro disrupt the calmodulin-UBE3B interaction. These studies demonstrate that UBE3B is an E3 ubiquitin ligase and reveal that the enzyme is regulated by calmodulin. Furthermore, the modulation of UBE3B via calmodulin and calcium implicates a role for calcium signaling in mitochondrial protein ubiquitylation, protein turnover, and disease.
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Affiliation(s)
- Andrea Braganza
- From the Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261.,the Hillman Cancer Center, University of Pittsburgh Cancer Institute
| | - Jianfeng Li
- the Department of Oncologic Sciences, Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama 36604
| | - Xuemei Zeng
- Biomedical Mass Spectrometry Center, School of the Health Sciences, and
| | - Nathan A Yates
- the Hillman Cancer Center, University of Pittsburgh Cancer Institute.,Biomedical Mass Spectrometry Center, School of the Health Sciences, and.,the Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, and
| | - Nupur B Dey
- the Department of Oncologic Sciences, Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama 36604
| | - Joel Andrews
- the Department of Oncologic Sciences, Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama 36604
| | - Jennifer Clark
- the Department of Oncologic Sciences, Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama 36604
| | - Leila Zamani
- the Department of Oncologic Sciences, Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama 36604
| | - Xiao-Hong Wang
- the Hillman Cancer Center, University of Pittsburgh Cancer Institute
| | - Claudette St Croix
- Department of Environmental and Occupational Health, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania 15213
| | - Roderick O'Sullivan
- From the Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261.,the Hillman Cancer Center, University of Pittsburgh Cancer Institute
| | - Laura Garcia-Exposito
- From the Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261.,the Hillman Cancer Center, University of Pittsburgh Cancer Institute
| | - Jeffrey L Brodsky
- the Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - Robert W Sobol
- From the Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, .,the Hillman Cancer Center, University of Pittsburgh Cancer Institute.,the Department of Oncologic Sciences, Mitchell Cancer Institute, University of South Alabama, Mobile, Alabama 36604
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13
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Vigeland MD, Gjøtterud KS, Selmer KK. FILTUS: a desktop GUI for fast and efficient detection of disease-causing variants, including a novel autozygosity detector. Bioinformatics 2016; 32:1592-4. [PMID: 26819469 PMCID: PMC4866527 DOI: 10.1093/bioinformatics/btw046] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 01/20/2016] [Indexed: 01/01/2023] Open
Abstract
Summary: FILTUS is a stand-alone tool for working with annotated variant files, e.g. when searching for variants causing Mendelian disease. Very flexible in terms of input file formats, FILTUS offers efficient filtering and a range of downstream utilities, including statistical analysis of gene sharing patterns, detection of de novo mutations in trios, quality control plots and autozygosity mapping. The autozygosity mapping is based on a hidden Markov model and enables accurate detection of autozygous regions directly from exome-scale variant files. Availability and implementation: FILTUS is written in Python and runs on Windows, Mac and Linux. Binaries and source code are freely available at http://folk.uio.no/magnusv/filtus.html and on GitHub: https://github.com/magnusdv/filtus. Automatic installation is available via PyPI (e.g. pip install filtus). Contact:magnusdv@medisin.uio.no Supplementary information:Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Magnus D Vigeland
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo N-0424
| | | | - Kaja K Selmer
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo N-0424
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14
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Ambrozkiewicz MC, Kawabe H. HECT-type E3 ubiquitin ligases in nerve cell development and synapse physiology. FEBS Lett 2015; 589:1635-43. [PMID: 25979171 DOI: 10.1016/j.febslet.2015.05.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 05/03/2015] [Accepted: 05/05/2015] [Indexed: 12/21/2022]
Abstract
The development of neurons is precisely controlled. Nerve cells are born from progenitor cells, migrate to their future target sites, extend dendrites and an axon to form synapses, and thus establish neural networks. All these processes are governed by multiple intracellular signaling cascades, among which ubiquitylation has emerged as a potent regulatory principle that determines protein function and turnover. Dysfunctions of E3 ubiquitin ligases or aberrant ubiquitin signaling contribute to a variety of brain disorders like X-linked mental retardation, schizophrenia, autism or Parkinson's disease. In this review, we summarize recent findings about molecular pathways that involve E3 ligases of the Homologous to E6-AP C-terminus (HECT) family and that control neuritogenesis, neuronal polarity formation, and synaptic transmission.
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Affiliation(s)
- Mateusz Cyryl Ambrozkiewicz
- Max Planck Institute of Experimental Medicine, Department of Molecular Neurobiology, Hermann-Rein-Straße 3, D-37075 Göttingen, Germany.
| | - Hiroshi Kawabe
- Max Planck Institute of Experimental Medicine, Department of Molecular Neurobiology, Hermann-Rein-Straße 3, D-37075 Göttingen, Germany.
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