1
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Paulet A, Bennett-Ness C, Ageorges F, Trost D, Green A, Goudie D, Jewell R, Kraatari-Tiri M, Piard J, Coubes C, Lam W, Lynch SA, Groeschel S, Ramond F, Fluss J, Fagerberg C, Brasch Andersen C, Varvagiannis K, Kleefstra T, Gérard B, Fradin M, Vitobello A, Tenconi R, Denommé-Pichon AS, Vincent-Devulder A, Haack T, Marsh JA, Laulund LW, Grimmel M, Riess A, de Boer E, Padilla-Lopez S, Bakhtiari S, Ostendorf A, Zweier C, Smol T, Willems M, Faivre L, Scala M, Striano P, Bagnasco I, Koboldt D, Iascone M, Suerink M, Kruer MC, Levy J, Verloes A, Abbott CM, Ruaud L. Expansion of the neurodevelopmental phenotype of individuals with EEF1A2 variants and genotype-phenotype study. Eur J Hum Genet 2024:10.1038/s41431-024-01560-8. [PMID: 38355961 DOI: 10.1038/s41431-024-01560-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 01/10/2024] [Accepted: 02/01/2024] [Indexed: 02/16/2024] Open
Abstract
Translation elongation factor eEF1A2 constitutes the alpha subunit of the elongation factor-1 complex, responsible for the enzymatic binding of aminoacyl-tRNA to the ribosome. Since 2012, 21 pathogenic missense variants affecting EEF1A2 have been described in 42 individuals with a severe neurodevelopmental phenotype including epileptic encephalopathy and moderate to profound intellectual disability (ID), with neurological regression in some patients. Through international collaborative call, we collected 26 patients with EEF1A2 variants and compared them to the literature. Our cohort shows a significantly milder phenotype. 83% of the patients are walking (vs. 29% in the literature), and 84% of the patients have language skills (vs. 15%). Three of our patients do not have ID. Epilepsy is present in 63% (vs. 93%). Neurological examination shows a less severe phenotype with significantly less hypotonia (58% vs. 96%), and pyramidal signs (24% vs. 68%). Cognitive regression was noted in 4% (vs. 56% in the literature). Among individuals over 10 years, 56% disclosed neurocognitive regression, with a mean age of onset at 2 years. We describe 8 novel missense variants of EEF1A2. Modeling of the different amino-acid sites shows that the variants associated with a severe phenotype, and the majority of those associated with a moderate phenotype, cluster within the switch II region of the protein and thus may affect GTP exchange. In contrast, variants associated with milder phenotypes may impact secondary functions such as actin binding. We report the largest cohort of individuals with EEF1A2 variants thus far, allowing us to expand the phenotype spectrum and reveal genotype-phenotype correlations.
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Affiliation(s)
- Alix Paulet
- Département de Génétique, Hôpital Robert-Debré, Paris, France.
| | - Cavan Bennett-Ness
- Centre for Genomic and Experimental Medicine and Simons Initiative for the Developing Brain, Institute of Genetics and Cancer, Edinburgh, Scotland, UK
| | | | | | - Andrew Green
- UCD School of Medicine and Medical Science Consultant in Clinical Genetics, Dublin, Ireland
| | - David Goudie
- Regional Genetics Service, NHS Tayside, Dundee, Scotland, UK
| | - Rosalyn Jewell
- Yorkshire Regional Genetics Service, Leeds Teaching Hospitals NHS Trust, Leeds, England, UK
| | - Minna Kraatari-Tiri
- Department of Clinical Genetics, Research unit of Clinical Medicine, Medical Research Center Oulu, Oulu, Finland
- Oulu University Hospital and University of Oulu, Oulu, Finland
| | - Juliette Piard
- Centre de Génétique Humaine, CHU Besançon, Besançon, France
| | - Christine Coubes
- Service de Génétique Médicale, CHU de Montpellier, Montpellier, France
| | - Wayne Lam
- South-East of Scotland Clinical Genetics Service, General Hospital, Edinburgh, Scotland, UK
| | - Sally Ann Lynch
- Clinical Genetics, Children's Health Ireland, Dublin, Ireland
| | - Samuel Groeschel
- Department of Neuropediatrics, University Children's Hospital, Tuebingen, Germany
| | - Francis Ramond
- Service de Génétique, CHU Saint-Etienne - Hôpital Nord, Saint-Etienne, France
| | - Joël Fluss
- University Hospitals of Geneva, Geneva, Switzerland
| | - Christina Fagerberg
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
| | | | | | - Tjitske Kleefstra
- Department of Clinical Genetics, Erasmus MC University Medical Center, Rotterdam, The Netherlands
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, The Netherlands
- Center of Excellence for Neuropsychiatry, Vincent van Gogh Institute for Psychiatry, Venray, The Netherlands
| | | | - Mélanie Fradin
- Service de Génétique Médicale, Hôpital Sud, CHU de Rennes, Rennes, France
| | - Antonio Vitobello
- UMR-Inserm, Génétique des Anomalies du développement, Université de Bourgogne Franche-Comté, Dijon, France
| | - Romano Tenconi
- Servizio di Genetica Medica, Dipartimento di Pediatra, Padova, Italia
| | - Anne-Sophie Denommé-Pichon
- Unité Fonctionnelle Innovation en Diagnostic génomique des maladies rares, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
- UMR1231 GAD, Inserm - Université Bourgogne-Franche Comté, Dijon, France
| | | | - Tobias Haack
- Institute of Medical Genetics and Applied Genomics, University of Tübingen, Tübingen, Germany
| | - Joseph A Marsh
- MRC Human Genetics Unit, Western General Hospital, University of Edinburgh, Edinburgh, Scotland, UK
| | | | - Mona Grimmel
- Institute of Medical Genetics and Applied Genomics, University of Tübingen, Tübingen, Germany
| | - Angelika Riess
- Institute of Medical Genetics and Applied Genomics, University of Tübingen, Tübingen, Germany
| | - Elke de Boer
- Department of Clinical Genetics, Erasmus MC University Medical Center, Rotterdam, The Netherlands
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, The Netherlands
| | - Sergio Padilla-Lopez
- Pediatric Movement Disorders Program, Division of Pediatric Neurology, Barrow Neurological Institute, Phoenix Children's Hospital, Phoenix, AZ, USA
| | - Somayeh Bakhtiari
- Pediatric Movement Disorders Program, Division of Pediatric Neurology, Barrow Neurological Institute, Phoenix Children's Hospital, Phoenix, AZ, USA
| | - Adam Ostendorf
- Steve and Cindy Rasmussen Institute for Genomic Medicine Nationwide Children's Hospital, Colombus, Ohio, USA
- Department of Pediatrics, The Ohio State University College of Medicine, Colombus, USA
| | - Christiane Zweier
- Department of Human Genetics, Inselspital Bern, University of Bern, 3010, Bern, Switzerland
- Institute of Human Genetics, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Thomas Smol
- University of Lille, EA7364-RADEME, Medical Genetics Institute, Chu Lille, Lille, France
| | - Marjolaine Willems
- Medical Genetic Department for Rare Diseases and Personalized Medicine, Reference Center AD SOOR, AnDDI-RARE, Groupe DI, Inserm U1298, INM, Montpellier University, Montpellier, France
- Centre Hospitalier Universitaire de Montpellier, Montpellier, France
| | - Laurence Faivre
- UMR1231 GAD, Inserm, Université de Bourgogne-Franche Comté, Dijon, France
- Centre de Référence Maladies Rares « Anomalies du développement et syndromes malformatifs », Centre de Génétique, FHU-TRANSLAD et Institut GIMI, CHU dijon, Bourgogne, Dijon, France
| | - Marcello Scala
- Pediatric Neurology and Muscular Diseases Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Genoa, Italy
| | - Pasquale Striano
- Pediatric Neurology and Muscular Diseases Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Genoa, Italy
| | - Irene Bagnasco
- Division of Child Neuropsychiatry, Martini Hospital, Torino, Italy
| | - Daniel Koboldt
- Steve and Cindy Rasmussen Institute for Genomic Medicine Nationwide Children's Hospital, Colombus, Ohio, USA
| | | | - Manon Suerink
- Department of Clinical Genetics, Leiden University Medical Centre, Leiden, the Netherlands
| | - Michael C Kruer
- Pediatric Movement Disorders Program, Division of Pediatric Neurology, Barrow Neurological Institute, Phoenix Children's Hospital, Phoenix, AZ, USA
| | - Jonathan Levy
- Département de Génétique, Hôpital Robert-Debré, Paris, France
| | - Alain Verloes
- Département de Génétique, Hôpital Robert-Debré, Paris, France
| | - Catherine M Abbott
- Centre for Genomic and Experimental Medicine and Simons Initiative for the Developing Brain, Institute of Genetics and Cancer, Edinburgh, Scotland, UK
| | - Lyse Ruaud
- Département de Génétique, Hôpital Robert-Debré, Paris, France
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2
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Wang S, Sun S. Translation dysregulation in neurodegenerative diseases: a focus on ALS. Mol Neurodegener 2023; 18:58. [PMID: 37626421 PMCID: PMC10464328 DOI: 10.1186/s13024-023-00642-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 07/21/2023] [Indexed: 08/27/2023] Open
Abstract
RNA translation is tightly controlled in eukaryotic cells to regulate gene expression and maintain proteome homeostasis. RNA binding proteins, translation factors, and cell signaling pathways all modulate the translation process. Defective translation is involved in multiple neurological diseases including amyotrophic lateral sclerosis (ALS). ALS is a progressive neurodegenerative disorder and poses a major public health challenge worldwide. Over the past few years, tremendous advances have been made in the understanding of the genetics and pathogenesis of ALS. Dysfunction of RNA metabolisms, including RNA translation, has been closely associated with ALS. Here, we first introduce the general mechanisms of translational regulation under physiological and stress conditions and review well-known examples of translation defects in neurodegenerative diseases. We then focus on ALS-linked genes and discuss the recent progress on how translation is affected by various mutant genes and the repeat expansion-mediated non-canonical translation in ALS.
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Affiliation(s)
- Shaopeng Wang
- Department of Physiology and Brain Science Institute, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Shuying Sun
- Department of Physiology and Brain Science Institute, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
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3
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Frankel E, Podder A, Sharifi M, Pillai R, Belnap N, Ramsey K, Dodson J, Venugopal P, Brzezinski M, Llaci L, Gerald B, Mills G, Sanchez-Castillo M, Balak CD, Szelinger S, Jepsen WM, Siniard AL, Richholt R, Naymik M, Schrauwen I, Craig DW, Piras IS, Huentelman MJ, Schork NJ, Narayanan V, Rangasamy S. Genetic and Protein Network Underlying the Convergence of Rett-Syndrome-like (RTT-L) Phenotype in Neurodevelopmental Disorders. Cells 2023; 12:1437. [PMID: 37408271 DOI: 10.3390/cells12101437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 04/20/2023] [Accepted: 04/29/2023] [Indexed: 07/07/2023] Open
Abstract
Mutations of the X-linked gene encoding methyl-CpG-binding protein 2 (MECP2) cause classical forms of Rett syndrome (RTT) in girls. A subset of patients who are recognized to have an overlapping neurological phenotype with RTT but are lacking a mutation in a gene that causes classical or atypical RTT can be described as having a 'Rett-syndrome-like phenotype (RTT-L). Here, we report eight patients from our cohort diagnosed as having RTT-L who carry mutations in genes unrelated to RTT. We annotated the list of genes associated with RTT-L from our patient cohort, considered them in the light of peer-reviewed articles on the genetics of RTT-L, and constructed an integrated protein-protein interaction network (PPIN) consisting of 2871 interactions connecting 2192 neighboring proteins among RTT- and RTT-L-associated genes. Functional enrichment analysis of RTT and RTT-L genes identified a number of intuitive biological processes. We also identified transcription factors (TFs) whose binding sites are common across the set of RTT and RTT-L genes and appear as important regulatory motifs for them. Investigation of the most significant over-represented pathway analysis suggests that HDAC1 and CHD4 likely play a central role in the interactome between RTT and RTT-L genes.
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Affiliation(s)
- Eric Frankel
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Avijit Podder
- Quantitative Medicine Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Megan Sharifi
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Roshan Pillai
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Newell Belnap
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
- Center for Rare Childhood Disorders (C4RCD), Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Keri Ramsey
- Center for Rare Childhood Disorders (C4RCD), Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Julius Dodson
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Pooja Venugopal
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Molly Brzezinski
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Lorida Llaci
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
- Quantitative Medicine Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Brittany Gerald
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Gabrielle Mills
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Meredith Sanchez-Castillo
- Center for Rare Childhood Disorders (C4RCD), Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Chris D Balak
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Szabolcs Szelinger
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Wayne M Jepsen
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Ashley L Siniard
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Ryan Richholt
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Marcus Naymik
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Isabelle Schrauwen
- Center for Statistical Genetics, Department of Neurology, Gertrude H. Sergievsky Center, Columbia University Medical Center, New York, NY 10032, USA
| | - David W Craig
- Department of Translational Genomics, University of Southern California, Los Angeles, CA 90033, USA
| | - Ignazio S Piras
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Matthew J Huentelman
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
- Quantitative Medicine Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Nicholas J Schork
- Quantitative Medicine Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
- City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Vinodh Narayanan
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
- Center for Rare Childhood Disorders (C4RCD), Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Sampathkumar Rangasamy
- Neurogenomics Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
- Center for Rare Childhood Disorders (C4RCD), Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
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4
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Vogt LM, Lorenzo M, B Prendergast D, Jobling R, Gill PJ. EEF1A2 pathogenic variant presenting in an infant with failure to thrive and frequent apneas requiring respiratory support. Am J Med Genet A 2022; 188:3106-3109. [PMID: 35938194 DOI: 10.1002/ajmg.a.62932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 05/16/2022] [Accepted: 06/02/2022] [Indexed: 01/31/2023]
Abstract
EEF1A2 is a gene whose protein product, eukaryotic translation elongation factor 1 alpha 2 (eEF1A2), plays an important role in neurodevelopment. Reports of individuals with pathogenic variants in EEF1A2 are rare, with less than 40 individuals reported world-wide, however a common feature is the association of the variant with developmental and epileptic encephalopathy. Thus far, there have been limited reports of other organ systems or body functions affected by variants in this gene. Here, we present a case of a child with EEF1A2-related disorder who presented at 3 months of age with hypotonia, microcephaly, failure to thrive, and respiratory insufficiency with central apneas requiring respiratory support. Our case highlights the notion that the respiratory system may be highly implicated in EEF1A2-related disorder, allowing for better phenotypic characterization of the disorder.
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Affiliation(s)
- Lindsey M Vogt
- Division of Paediatric Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Melissa Lorenzo
- Division of Emergency Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
| | - D'Arcy B Prendergast
- Division of Clinical and Metabolic Genetics, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Rebekah Jobling
- Division of Clinical and Metabolic Genetics, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Peter J Gill
- Division of Paediatric Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
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5
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Malone TJ, Kaczmarek LK. The role of altered translation in intellectual disability and epilepsy. Prog Neurobiol 2022; 213:102267. [PMID: 35364140 PMCID: PMC10583652 DOI: 10.1016/j.pneurobio.2022.102267] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 02/18/2022] [Accepted: 03/24/2022] [Indexed: 11/29/2022]
Abstract
A very high proportion of cases of intellectual disability are genetic in origin and are associated with the occurrence of epileptic seizures during childhood. These two disorders together effect more than 5% of the world's population. One feature linking the two diseases is that learning and memory require the synthesis of new synaptic components and ion channels, while maintenance of overall excitability also requires synthesis of similar proteins in response to altered neuronal stimulation. Many of these disorders result from mutations in proteins that regulate mRNA processing, translation initiation, translation elongation, mRNA stability or upstream translation modulators. One theme that emerges on reviewing this field is that mutations in proteins that regulate changes in translation following neuronal stimulation are more likely to result in epilepsy with intellectual disability than general translation regulators with no known role in activity-dependent changes. This is consistent with the notion that activity-dependent translation in neurons differs from that in other cells types in that the changes in local cellular composition, morphology and connectivity that occur generally in response to stimuli are directly coupled to local synaptic activity and persist for months or years after the original stimulus.
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Affiliation(s)
- Taylor J Malone
- Departments of Pharmacology, and of Cellular & Molecular Physiology, Yale University, 333 Cedar Street B-309, New Haven, CT 06520, USA
| | - Leonard K Kaczmarek
- Departments of Pharmacology, and of Cellular & Molecular Physiology, Yale University, 333 Cedar Street B-309, New Haven, CT 06520, USA.
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6
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Mills A, Gago F. On the Need to Tell Apart Fraternal Twins eEF1A1 and eEF1A2, and Their Respective Outfits. Int J Mol Sci 2021; 22:6973. [PMID: 34203525 PMCID: PMC8268798 DOI: 10.3390/ijms22136973] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/25/2021] [Accepted: 06/25/2021] [Indexed: 01/03/2023] Open
Abstract
eEF1A1 and eEF1A2 are paralogous proteins whose presence in most normal eukaryotic cells is mutually exclusive and developmentally regulated. Often described in the scientific literature under the collective name eEF1A, which stands for eukaryotic elongation factor 1A, their best known activity (in a monomeric, GTP-bound conformation) is to bind aminoacyl-tRNAs and deliver them to the A-site of the 80S ribosome. However, both eEF1A1 and eEF1A2 are endowed with multitasking abilities (sometimes performed by homo- and heterodimers) and can be located in different subcellular compartments, from the plasma membrane to the nucleus. Given the high sequence identity of these two sister proteins and the large number of post-translational modifications they can undergo, we are often confronted with the dilemma of discerning which is the particular proteoform that is actually responsible for the ascribed biochemical or cellular effects. We argue in this review that acquiring this knowledge is essential to help clarify, in molecular and structural terms, the mechanistic involvement of these two ancestral and abundant G proteins in a variety of fundamental cellular processes other than translation elongation. Of particular importance for this special issue is the fact that several de novo heterozygous missense mutations in the human EEF1A2 gene are associated with a subset of rare but severe neurological syndromes and cardiomyopathies.
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Affiliation(s)
| | - Federico Gago
- Department of Biomedical Sciences & “Unidad Asociada IQM-CSIC”, School of Medicine and Health Sciences, University of Alcalá, E-28805 Alcalá de Henares, Spain;
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7
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Kaur S, Van Bergen NJ, Ben-Zeev B, Leonardi E, Tan TY, Coman D, Kamien B, White SM, St John M, Phelan D, Rigbye K, Lim SC, Torres MC, Marty M, Savva E, Zhao T, Massey S, Murgia A, Gold WA, Christodoulou J. Expanding the genetic landscape of Rett syndrome to include lysine acetyltransferase 6A (KAT6A). J Genet Genomics 2020; 47:650-654. [PMID: 33386251 DOI: 10.1016/j.jgg.2020.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 09/21/2020] [Accepted: 09/23/2020] [Indexed: 10/23/2022]
Affiliation(s)
- Simranpreet Kaur
- Brain and Mitochondrial Research Group, Murdoch Children's Research Institute, Melbourne, Australia; Department of Paediatrics, University of Melbourne, Melbourne, Australia
| | - Nicole J Van Bergen
- Brain and Mitochondrial Research Group, Murdoch Children's Research Institute, Melbourne, Australia; Department of Paediatrics, University of Melbourne, Melbourne, Australia
| | - Bruria Ben-Zeev
- Paediatric Neurology Institute, The Edmond and Lily Safra Paediatric Hospital, Sheba Medical Center, Tel HaShomer, Israel; Sackler School of Medicine, Tel Aviv University, Israel
| | - Emanuela Leonardi
- Molecular Genetics of Neurodevelopment, Department of Woman and Child Health, University of Padova, Italy; Fondazione Istituto di Ricerca Pediatrica (IRP), Città della Speranza, Padova, Italy
| | - Tiong Y Tan
- Department of Paediatrics, University of Melbourne, Melbourne, Australia; Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia
| | - David Coman
- Department of Paediatrics, The Wesley Hospital, Brisbane, Brisbane, Australia; Queensland Children's Hospital, Brisbane, Australia; School of Medicine, University of Queensland, Brisbane, Australia
| | - Benjamin Kamien
- Genetic Services of Western Australia, Western Australia, Australia; Faculty of Health and Medical Sciences, University of Western Australia, Australia
| | - Susan M White
- Department of Paediatrics, University of Melbourne, Melbourne, Australia; Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia
| | - Miya St John
- Speech and Language, Murdoch Children's Research Institute, Parkville, Victoria, Australia; Department of Audiology and Speech Pathology, University of Melbourne, Parkville, Victoria, Australia
| | - Dean Phelan
- Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia
| | - Kristin Rigbye
- Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia
| | - Sze Chern Lim
- Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia
| | - Michelle C Torres
- Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia
| | - Melanie Marty
- Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia
| | - Elena Savva
- Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia
| | - Teresa Zhao
- Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia
| | - Sean Massey
- Brain and Mitochondrial Research Group, Murdoch Children's Research Institute, Melbourne, Australia
| | - Alessandra Murgia
- Molecular Genetics of Neurodevelopment, Department of Woman and Child Health, University of Padova, Italy; Fondazione Istituto di Ricerca Pediatrica (IRP), Città della Speranza, Padova, Italy
| | - Wendy A Gold
- The University of Sydney, School of Medical Sciences and Discipline of Child and Adolescent Health, Faculty of Medicine and Health, Sydney, Australia; Molecular Neurobiology Lab, Kids Research, Westmead Children's Hospital, Westmead, Sydney, Australia; Kids Neuroscience Centre, Kids Research, Children's Hospital at Westmead, Westmead, Sydney, Australia
| | - John Christodoulou
- Brain and Mitochondrial Research Group, Murdoch Children's Research Institute, Melbourne, Australia; Department of Paediatrics, University of Melbourne, Melbourne, Australia; Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, Australia; The University of Sydney, School of Medical Sciences and Discipline of Child and Adolescent Health, Faculty of Medicine and Health, Sydney, Australia.
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8
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Jdila MB, Triki CC, Ghorbel R, Bouchalla W, Ncir SB, Kamoun F, Fakhfakh F. Unusual double mutation in MECP2 and CDKL5 genes in Rett-like syndrome: Correlation with phenotype and genes expression. Clin Chim Acta 2020; 508:287-294. [PMID: 32445745 DOI: 10.1016/j.cca.2020.05.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 05/12/2020] [Accepted: 05/19/2020] [Indexed: 12/16/2022]
Abstract
INTRODUCTION Rett syndrome (RTT) is a neuro-developmental disorder affecting almost exclusively females and it divided into classical and atypical forms of the disease. RTT-like syndrome was also described and presents an overlapping phenotype of RTT. RTT-like syndrome has been associated with several genes including MECP2 and CDKL5 having common biological pathways and regulatory interactions especially during neural maturation and synaptogenesis. METHODS We report patient with Rett-like syndrome for whom clinical features and their progression guided toward the screening of two candidate genes MECP2 and CDKL5 by sequencing. Severity score was evaluated by "Rett Assessment Rating Scale" (R.A.R.S.). Predictions of pahogenicity and functional effects used several bioinformatic tools and qRT-PCR was conducted to evaluate gene expression. RESULTS Mutational screening revealed two mutations c.1065 C > A (p.S355R) in MECP2 gene and c.616 G > A (p.D206N) mutation in CDKL5 gene in the patient with a high R.A.R.S. Bioinformatic investigations predicted a moderate effect of p.S355R in MECP2 gene but a more pathogenic one of p.D206N mutation in CDKL5. Effect of c.616 G > A mutation on structure and stability of CDKL5 mRNA was confirmed by qRT-PCR. Additionally, analysis of gene expression revealed a drastic effect of CDKL5 mutant on its MeCP2 and Dnmt1 substrates and also on its MYCN regulator. CONCLUSIONS The co-existence of the two mutations in CDKL5 and MECP2 genes could explain the severe phenotype in our patient with RTT-Like and is consistent with the data related to the interactions of CDKL5 with MeCP2 and Dnmt1 proteins.
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Affiliation(s)
- Marwa Ben Jdila
- Research Laboratory 'NeuroPédiatrie' (LR19ES15), Sfax Medical School, Sfax University, Tunisia; Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax University, Tunisia.
| | - Chahnez Charfi Triki
- Research Laboratory 'NeuroPédiatrie' (LR19ES15), Sfax Medical School, Sfax University, Tunisia; Child Neurology Department, Hedi Chaker Universitary Hospital of Sfax, Tunisia
| | - Rania Ghorbel
- Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax University, Tunisia
| | - Wafa Bouchalla
- Research Laboratory 'NeuroPédiatrie' (LR19ES15), Sfax Medical School, Sfax University, Tunisia; Child Neurology Department, Hedi Chaker Universitary Hospital of Sfax, Tunisia
| | - Sihem Ben Ncir
- Research Laboratory 'NeuroPédiatrie' (LR19ES15), Sfax Medical School, Sfax University, Tunisia; Child Neurology Department, Hedi Chaker Universitary Hospital of Sfax, Tunisia
| | - Fatma Kamoun
- Research Laboratory 'NeuroPédiatrie' (LR19ES15), Sfax Medical School, Sfax University, Tunisia; Child Neurology Department, Hedi Chaker Universitary Hospital of Sfax, Tunisia
| | - Faiza Fakhfakh
- Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax University, Tunisia.
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