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The dynamics of autism spectrum disorders: how neurotoxic compounds and neurotransmitters interact. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2013; 10:3384-408. [PMID: 23924882 PMCID: PMC3774444 DOI: 10.3390/ijerph10083384] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 07/23/2013] [Accepted: 07/23/2013] [Indexed: 12/31/2022]
Abstract
In recent years concern has risen about the increasing prevalence of Autism Spectrum Disorders (ASD). Accumulating evidence shows that exposure to neurotoxic compounds is related to ASD. Neurotransmitters might play a key role, as research has indicated a connection between neurotoxic compounds, neurotransmitters and ASD. In the current review a literature overview with respect to neurotoxic exposure and the effects on neurotransmitter systems is presented. The aim was to identify mechanisms and related factors which together might result in ASD. The literature reported in the current review supports the hypothesis that exposure to neurotoxic compounds can lead to alterations in the GABAergic, glutamatergic, serotonergic and dopaminergic system which have been related to ASD in previous work. However, in several studies findings were reported that are not supportive of this hypothesis. Other factors also might be related, possibly altering the mechanisms at work, such as time and length of exposure as well as dose of the compound. Future research should focus on identifying the pathway through which these factors interact with exposure to neurotoxic compounds making use of human studies.
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52
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LaSalle JM, Powell WT, Yasui DH. Epigenetic layers and players underlying neurodevelopment. Trends Neurosci 2013; 36:460-70. [PMID: 23731492 DOI: 10.1016/j.tins.2013.05.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 05/02/2013] [Accepted: 05/03/2013] [Indexed: 12/22/2022]
Abstract
Epigenetic mechanisms convey information above and beyond the sequence of DNA, so it is predicted that they are critical in the complex regulation of brain development and explain the long-lived effects of environmental cues on pre- and early post-natal brain development. Neurons have a complex epigenetic landscape that changes dynamically with transcriptional activity in early life. Here, we summarize progress in our understanding of the discrete layers of the dynamic methylome, chromatin proteome, noncoding RNAs, chromatin loops, and long-range interactions in neuronal development and maturation. Many neurodevelopmental disorders have genetic alterations in these epigenetic modifications or regulators, and these human genetics lessons have demonstrated the importance of these epigenetic players and the epigenetic layers that transcriptional events lay down in the early brain.
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Affiliation(s)
- Janine M LaSalle
- Medical Microbiology and Immunology, Genome Center, MIND Institute, University of California, Davis, CA, USA.
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53
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Di Rocco A, Loggini A, Di Rocco M, Di Rocco P, Rossi RP, Gimelli G, Bazil C. Paradoxical worsening of seizure activity with pregabalin in an adult with isodicentric 15 (IDIC-15) syndrome involving duplications of the GABRB3, GABRA5 and GABRG3 genes. BMC Neurol 2013; 13:43. [PMID: 23663378 PMCID: PMC3660219 DOI: 10.1186/1471-2377-13-43] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Accepted: 04/25/2013] [Indexed: 11/10/2022] Open
Abstract
Background Isodicentric 15 syndrome (IDIC-15) is due to partial duplications of chromosome 15 that may includes the q11–13 region that includes genes encoding the α5 (GABRA5) and β3 - γ3 (GABRB3) receptor subunits. The disease causes intellectual and physical developmental delay, seizures, intellectual disability and behavioral disorders that may be related to abnormal GABA receptor function and morphology. Seizures are often severe and may be refractory to treatment. There are however no specific guidelines for the treatment of the seizures and it is unknown whether drugs that affect the GABAergic system have a different effect in IDIC-15 seizures. Case presentation We report the case of an adult individual with IDIC-15 whose complex-partial seizures worsened dramatically after the introduction of pregabalin, with increased seizure frequency, frequent generalization, and appearance of new seizure pattern. Her cognitive function and verbal skills also worsened during treatment with pregabalin. Her seizures and cognitive skills quickly improved after pregabalin was discontinued and treatment with lacosamide started. Discussion As her genetic testing confirmed that her region of duplication included GABA receptor encoding genes, it is plausible that the worsening of seizures were due to induction of an abnormal GABAergic response to pregabalin. Conclusion As her genetic testing confirmed that her region of duplication included GABA receptor encoding genes, it is plausible that the worsening of seizures were due to induction of an abnormal GABAergic response to pregabalin.This case may help define proper therapeutic strategies for the treatment of IDIC-15 associated seizures.
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54
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Gordillo-González G, Hernández M, Tamayo M, Osorio G. A patient with convulsive syndrome and partial tetrasomy of chromosome 15. NEUROLOGÍA (ENGLISH EDITION) 2013. [DOI: 10.1016/j.nrleng.2011.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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55
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Millan MJ. An epigenetic framework for neurodevelopmental disorders: from pathogenesis to potential therapy. Neuropharmacology 2012; 68:2-82. [PMID: 23246909 DOI: 10.1016/j.neuropharm.2012.11.015] [Citation(s) in RCA: 150] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2012] [Revised: 11/11/2012] [Accepted: 11/22/2012] [Indexed: 12/12/2022]
Abstract
Neurodevelopmental disorders (NDDs) are characterized by aberrant and delayed early-life development of the brain, leading to deficits in language, cognition, motor behaviour and other functional domains, often accompanied by somatic symptoms. Environmental factors like perinatal infection, malnutrition and trauma can increase the risk of the heterogeneous, multifactorial and polygenic disorders, autism and schizophrenia. Conversely, discrete genetic anomalies are involved in Down, Rett and Fragile X syndromes, tuberous sclerosis and neurofibromatosis, the less familiar Phelan-McDermid, Sotos, Kleefstra, Coffin-Lowry and "ATRX" syndromes, and the disorders of imprinting, Angelman and Prader-Willi syndromes. NDDs have been termed "synaptopathies" in reference to structural and functional disturbance of synaptic plasticity, several involve abnormal Ras-Kinase signalling ("rasopathies"), and many are characterized by disrupted cerebral connectivity and an imbalance between excitatory and inhibitory transmission. However, at a different level of integration, NDDs are accompanied by aberrant "epigenetic" regulation of processes critical for normal and orderly development of the brain. Epigenetics refers to potentially-heritable (by mitosis and/or meiosis) mechanisms controlling gene expression without changes in DNA sequence. In certain NDDs, prototypical epigenetic processes of DNA methylation and covalent histone marking are impacted. Conversely, others involve anomalies in chromatin-modelling, mRNA splicing/editing, mRNA translation, ribosome biogenesis and/or the regulatory actions of small nucleolar RNAs and micro-RNAs. Since epigenetic mechanisms are modifiable, this raises the hope of novel therapy, though questions remain concerning efficacy and safety. The above issues are critically surveyed in this review, which advocates a broad-based epigenetic framework for understanding and ultimately treating a diverse assemblage of NDDs ("epigenopathies") lying at the interface of genetic, developmental and environmental processes. This article is part of the Special Issue entitled 'Neurodevelopmental Disorders'.
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Affiliation(s)
- Mark J Millan
- Unit for Research and Discovery in Neuroscience, IDR Servier, 125 chemin de ronde, 78290 Croissy sur Seine, Paris, France.
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56
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Coughlin CR, Scharer GH, Shaikh TH. Clinical impact of copy number variation analysis using high-resolution microarray technologies: advantages, limitations and concerns. Genome Med 2012; 4:80. [PMID: 23114084 PMCID: PMC3580449 DOI: 10.1186/gm381] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Copy number variation (CNV) analysis has had a major impact on the field of medical genetics, providing a mechanism to identify disease-causing genomic alterations in an unprecedented number of diseases and phenotypes. CNV analysis is now routinely used in the clinical diagnostic laboratory, and has led to a significant increase in the detection of chromosomal abnormalities. These findings are used for prenatal decision making, clinical management and genetic counseling. Although a powerful tool to identify genomic alterations, CNV analysis may also result in the detection of genomic alterations that have unknown clinical significance or reveal unintended information. This highlights the importance of informed consent and genetic counseling for clinical CNV analysis. This review examines the advantages and limitations of CNV discovery in the clinical diagnostic laboratory, as well as the impact on the clinician and family.
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Affiliation(s)
- Curtis R Coughlin
- Department of Pediatrics, Section of Clinical Genetics and Metabolism, University of Colorado Denver, Aurora, CO 80045, USA
| | - Gunter H Scharer
- Department of Pediatrics, Section of Clinical Genetics and Metabolism, University of Colorado Denver, Aurora, CO 80045, USA ; Intellectual and Developmental Disabilities Research Center, University of Colorado Denver, Aurora, CO 80045, USA
| | - Tamim H Shaikh
- Department of Pediatrics, Section of Clinical Genetics and Metabolism, University of Colorado Denver, Aurora, CO 80045, USA ; Intellectual and Developmental Disabilities Research Center, University of Colorado Denver, Aurora, CO 80045, USA
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57
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Mitchell MM, Woods R, Chi LH, Schmidt RJ, Pessah IN, Kostyniak PJ, LaSalle JM. Levels of select PCB and PBDE congeners in human postmortem brain reveal possible environmental involvement in 15q11-q13 duplication autism spectrum disorder. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2012; 53:589-98. [PMID: 22930557 PMCID: PMC3739306 DOI: 10.1002/em.21722] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Revised: 07/09/2012] [Accepted: 07/10/2012] [Indexed: 05/18/2023]
Abstract
Persistent organic pollutants (POPs), including polychlorinated biphenyls (PCBs) and polybrominated diphenylethers (PBDEs) that bioaccumulate in lipid-rich tissues are of concern as developmental neurotoxicants. Epigenetic mechanisms such as DNA methylation act at the interface of genetic and environmental factors implicated in autism-spectrum disorders. The relationship between POP levels and DNA methylation patterns in individuals with and without neurodevelopmental disorders has not been previously investigated. In this study, a total of 107 human frozen postmortem brain samples were analyzed for eight PCBs and seven PBDEs by GC-micro electron capture detector and GC/MS using negative chemical ionization. Human brain samples were grouped as neurotypical controls (n = 43), neurodevelopmental disorders with known genetic basis (n = 32, including Down, Rett, Prader-Willi, Angelman, and 15q11-q13 duplication syndromes), and autism of unknown etiology (n = 32). Unexpectedly, PCB 95 was significantly higher in the genetic neurodevelopmental group, but not idiopathic autism, as compared to neurotypical controls. Interestingly, samples with detectable PCB 95 levels were almost exclusively those with maternal 15q11-q13 duplication (Dup15q) or deletion in Prader-Willi syndrome. When sorted by birth year, Dup15q samples represented five out of six of genetic neurodevelopmental samples born after the 1976 PCB ban exhibiting detectable PCB 95 levels. Dup15q was the strongest predictor of PCB 95 exposure over age, gender, or year of birth. Dup15q brain showed lower levels of repetitive DNA methylation measured by LINE-1 pyrosequencing, but methylation levels were confounded by year of birth. These results demonstrate a novel paradigm by which specific POPs may predispose to genetic copy number variation of 15q11-q13.
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Affiliation(s)
- Michelle M. Mitchell
- Medical Microbiology&Immunology, School of Medicine, University of California, Davis, CA
- Genome Center, University of California, Davis, CA
- Medical Investigation of Neurodevelopmental Disorders Institute, University of California, Davis, CA
| | - Rima Woods
- Medical Microbiology&Immunology, School of Medicine, University of California, Davis, CA
- Genome Center, University of California, Davis, CA
- Medical Investigation of Neurodevelopmental Disorders Institute, University of California, Davis, CA
| | - Lai-Har Chi
- Toxicology Research Center, University at Buffalo, The State University of New York, Buffalo, NY
| | - Rebecca J. Schmidt
- Medical Investigation of Neurodevelopmental Disorders Institute, University of California, Davis, CA
- Center for Children's Environmental Health, University of California, Davis, CA 95616
- Public Health Sciences, University of California, Davis, CA 95616
| | - Isaac N. Pessah
- Center for Children's Environmental Health, University of California, Davis, CA 95616
- Environmental Toxicology, University of California, Davis, CA 95616
- Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA 95616
| | - Paul J. Kostyniak
- Toxicology Research Center, University at Buffalo, The State University of New York, Buffalo, NY
| | - Janine M. LaSalle
- Medical Microbiology&Immunology, School of Medicine, University of California, Davis, CA
- Genome Center, University of California, Davis, CA
- Medical Investigation of Neurodevelopmental Disorders Institute, University of California, Davis, CA
- Center for Children's Environmental Health, University of California, Davis, CA 95616
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58
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Abstract
Epigenetic mechanisms are regulatory processes that control gene expression changes involved in multiple aspects of neuronal function, including central nervous system development, synaptic plasticity, and memory. Recent evidence indicates that dysregulation of epigenetic mechanisms occurs in several human epilepsy syndromes. Despite this discovery of a potential role for epigenetic mechanisms in epilepsy, few studies have fully explored their contribution to the process of epilepsy development known as epileptogenesis. The purpose of this article is to discuss recent findings suggesting that the process of epileptogenesis may alter the epigenetic landscape, affecting the gene expression patterns observed in epilepsy. Future studies focused on a better characterization of these aberrant epigenetic mechanisms hold the promise of revealing novel treatment options for the prevention and even the reversal of epilepsy.
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59
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Epigenetic regulation in human neurodevelopmental disorders including autism, Rett syndrome, and epilepsy. Epigenomics 2012. [DOI: 10.1017/cbo9780511777271.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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60
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Dombret C, Nguyen T, Schakman O, Michaud JL, Hardin-Pouzet H, Bertrand MJ, De Backer O. Loss of Maged1 results in obesity, deficits of social interactions, impaired sexual behavior and severe alteration of mature oxytocin production in the hypothalamus. Hum Mol Genet 2012; 21:4703-17. [DOI: 10.1093/hmg/dds310] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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61
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Abstract
Rett syndrome is an X-linked autism-spectrum disorder caused by mutations in MECP2, encoding methyl CpG-binding protein 2. Since the discovery of MECP2 mutations as the genetic cause of Rett syndrome, the understanding of MeCP2 function has evolved. Although MeCP2 was predicted to be a global transcriptional repressor of methylated promoters, large-scale combined epigenomic approaches of MeCP2 binding, methylation and gene expression have demonstrated that MeCP2 binds preferentially to intergenic and intronic regions, and sparsely methylated promoters of active genes. This review compares the evolution of thought within two ‘classic’ epigenetic mechanisms of parental imprinting and X chromosome inactivation to that of the MeCP2 field, and considers the future relevance of integrated epigenomic databases to understanding autism and Rett syndrome.
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Affiliation(s)
- Janine M LaSalle
- Medical Microbiology and Immunology and Rowe Program in Human Genetics, University of California Davis School of Medicine, Davis, CA 95616, USA.
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62
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Pasinetti GM, Ho L, Dooley C, Abbi B, Lange G. Select non-coding RNA in blood components provide novel clinically accessible biological surrogates for improved identification of traumatic brain injury in OEF/OIF Veterans. AMERICAN JOURNAL OF NEURODEGENERATIVE DISEASE 2012; 1:88-98. [PMID: 22737634 PMCID: PMC3560446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Accepted: 04/23/2012] [Indexed: 06/01/2023]
Abstract
This study was designed to identify clinically accessible molecular biomarkers of mild traumatic brain injury (mTBI) that could be used to help identify returning Operation Iraqi Freedom (OIF) and Operation Enduring Freedom (OEF) Veterans who are suffering from the effects of mTBI. While analyzing the expression profile of small non-coding RNAs in peripheral blood mononuclear cells (PBMCs) from an OEF/OIF veteran study cohort using a high throughput array chip platform, we identified 18 candidate small non-coding RNA biomarkers that are differentially regulated in PBMCs of mTBI compared to non-TBI control cases. Independent quantitative real-time polymerase chain reaction assays confirmed that 13 of these candidate small RNA biomarker species are, indeed, significantly down-regulated in PBMCs of mTBI compared to non-TBI control veteran cases. Based on unsupervised clustering analysis, we identified a 3-biomarker panel which was most able to distinguish mTBI from non-TBI control veteran cases with high accuracy, selectivity and specificity. The majority of mTBI cases in our biomarker study were co-morbid with Post-Traumatic Stress Disorder (PTSD), and thus our non-TBI control cases were selected to match PTSD diagnoses. Therefore, our identified panel of 3 small RNA biomarkers likely represents a biological index selective for mTBI. Outcomes from our studies suggest that additional applications of the clinically accessible small non-coding RNA biomarkers to current diagnostic criteria may lead to improved mTBI detection and more sensitive outcome measures for clinical trials. Future studies exploring the physiological relevance of mTBI biomarkers will also provide a better understanding of the biological mechanisms underlying mTBI and insights into novel therapeutic targets for mTBI.
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Affiliation(s)
- Giulio M Pasinetti
- Department of Neurology, Mount Sinai School of Medicine, New York, NY 10029, USA
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63
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Skreka K, Schafferer S, Nat IR, Zywicki M, Salti A, Apostolova G, Griehl M, Rederstorff M, Dechant G, Hüttenhofer A. Identification of differentially expressed non-coding RNAs in embryonic stem cell neural differentiation. Nucleic Acids Res 2012; 40:6001-15. [PMID: 22492625 PMCID: PMC3401476 DOI: 10.1093/nar/gks311] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Protein-coding genes, guiding differentiation of ES cells into neural cells, have extensively been studied in the past. However, for the class of ncRNAs only the involvement of some specific microRNAs (miRNAs) has been described. Thus, to characterize the entire small non-coding RNA (ncRNA) transcriptome, involved in the differentiation of mouse ES cells into neural cells, we have generated three specialized ribonucleo-protein particle (RNP)-derived cDNA libraries, i.e. from pluripotent ES cells, neural progenitors and differentiated neural cells, respectively. By high-throughput sequencing and transcriptional profiling we identified several novel miRNAs to be involved in ES cell differentiation, as well as seven small nucleolar RNAs. In addition, expression of 7SL, 7SK and vault-2 RNAs was significantly up-regulated during ES cell differentiation. About half of ncRNA sequences from the three cDNA libraries mapped to intergenic or intragenic regions, designated as interRNAs and intraRNAs, respectively. Thereby, novel ncRNA candidates exhibited a predominant size of 18-30 nt, thus resembling miRNA species, but, with few exceptions, lacking canonical miRNA features. Additionally, these novel intraRNAs and interRNAs were not only found to be differentially expressed in stem-cell derivatives, but also in primary cultures of hippocampal neurons and astrocytes, strengthening their potential function in neural ES cell differentiation.
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Affiliation(s)
- Konstantinia Skreka
- Division of Genomics and RNomics, Biocenter, Medical University Innsbruck, Innrain 80/82, A-6020 Innsbruck, Austria
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64
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Leblond CS, Heinrich J, Delorme R, Proepper C, Betancur C, Huguet G, Konyukh M, Chaste P, Ey E, Rastam M, Anckarsäter H, Nygren G, Gillberg IC, Melke J, Toro R, Regnault B, Fauchereau F, Mercati O, Lemière N, Skuse D, Poot M, Holt R, Monaco AP, Järvelä I, Kantojärvi K, Vanhala R, Curran S, Collier DA, Bolton P, Chiocchetti A, Klauck SM, Poustka F, Freitag CM, Waltes R, Kopp M, Duketis E, Bacchelli E, Minopoli F, Ruta L, Battaglia A, Mazzone L, Maestrini E, Sequeira AF, Oliveira B, Vicente A, Oliveira G, Pinto D, Scherer SW, Zelenika D, Delepine M, Lathrop M, Bonneau D, Guinchat V, Devillard F, Assouline B, Mouren MC, Leboyer M, Gillberg C, Boeckers TM, Bourgeron T. Genetic and functional analyses of SHANK2 mutations suggest a multiple hit model of autism spectrum disorders. PLoS Genet 2012; 8:e1002521. [PMID: 22346768 PMCID: PMC3276563 DOI: 10.1371/journal.pgen.1002521] [Citation(s) in RCA: 308] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Accepted: 12/11/2011] [Indexed: 01/15/2023] Open
Abstract
Autism spectrum disorders (ASD) are a heterogeneous group of neurodevelopmental disorders with a complex inheritance pattern. While many rare variants in synaptic proteins have been identified in patients with ASD, little is known about their effects at the synapse and their interactions with other genetic variations. Here, following the discovery of two de novo SHANK2 deletions by the Autism Genome Project, we identified a novel 421 kb de novo SHANK2 deletion in a patient with autism. We then sequenced SHANK2 in 455 patients with ASD and 431 controls and integrated these results with those reported by Berkel et al. 2010 (n = 396 patients and n = 659 controls). We observed a significant enrichment of variants affecting conserved amino acids in 29 of 851 (3.4%) patients and in 16 of 1,090 (1.5%) controls (P = 0.004, OR = 2.37, 95% CI = 1.23-4.70). In neuronal cell cultures, the variants identified in patients were associated with a reduced synaptic density at dendrites compared to the variants only detected in controls (P = 0.0013). Interestingly, the three patients with de novo SHANK2 deletions also carried inherited CNVs at 15q11-q13 previously associated with neuropsychiatric disorders. In two cases, the nicotinic receptor CHRNA7 was duplicated and in one case the synaptic translation repressor CYFIP1 was deleted. These results strengthen the role of synaptic gene dysfunction in ASD but also highlight the presence of putative modifier genes, which is in keeping with the "multiple hit model" for ASD. A better knowledge of these genetic interactions will be necessary to understand the complex inheritance pattern of ASD.
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Affiliation(s)
- Claire S. Leblond
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
| | - Jutta Heinrich
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, Germany
| | - Richard Delorme
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- Assistance Publique-Hôpitaux de Paris, Robert Debré Hospital, Department of Child and Adolescent Psychiatry, Paris, France
| | | | - Catalina Betancur
- INSERM, U952, Paris, France
- CNRS, UMR 7224, Paris, France
- UPMC Univ Paris 06, Paris, France
| | - Guillaume Huguet
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
| | - Marina Konyukh
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
| | - Pauline Chaste
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
| | - Elodie Ey
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
| | - Maria Rastam
- Department of Clinical Sciences in Lund, Lund University, Lund, Sweden
| | | | - Gudrun Nygren
- Gillberg Neuropsychiatry Centre, University of Gothenburg, Göteborg, Sweden
| | - I. Carina Gillberg
- Gillberg Neuropsychiatry Centre, University of Gothenburg, Göteborg, Sweden
| | - Jonas Melke
- Institute of Neuroscience and Physiology, Department of Pharmacology, Gothenburg University, Göteborg, Sweden
| | - Roberto Toro
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
| | - Beatrice Regnault
- Eukaryote Genotyping Platform, Genopole, Institut Pasteur, Paris, France
| | - Fabien Fauchereau
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
| | - Oriane Mercati
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
| | - Nathalie Lemière
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
| | - David Skuse
- Behavioural and Brain Sciences Unit, Institute of Child Health, University College London, London, United Kingdom
| | - Martin Poot
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Richard Holt
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Anthony P. Monaco
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Irma Järvelä
- Department of Medical Genetics, University of Helsinki, Helsinki, Finland
| | - Katri Kantojärvi
- Department of Medical Genetics, University of Helsinki, Helsinki, Finland
| | - Raija Vanhala
- Department of Medical Genetics, University of Helsinki, Helsinki, Finland
| | - Sarah Curran
- Academic Department of Child and Adolescent Psychiatry, Institute of Psychiatry, King's College London, London, United Kingdom
| | - David A. Collier
- Social Genetic Developmental Psychiatry Centre, Institute of Psychiatry, King's College London, London, United Kingdom
| | - Patrick Bolton
- Academic Department of Child and Adolescent Psychiatry, Institute of Psychiatry, King's College London, London, United Kingdom
- Social Genetic Developmental Psychiatry Centre, Institute of Psychiatry, King's College London, London, United Kingdom
| | - Andreas Chiocchetti
- Division of Molecular Genome Analysis, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Sabine M. Klauck
- Division of Molecular Genome Analysis, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Fritz Poustka
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Goethe University, Frankfurt am Main, Germany
| | - Christine M. Freitag
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Goethe University, Frankfurt am Main, Germany
| | - Regina Waltes
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Goethe University, Frankfurt am Main, Germany
| | - Marnie Kopp
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Goethe University, Frankfurt am Main, Germany
| | - Eftichia Duketis
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Goethe University, Frankfurt am Main, Germany
| | - Elena Bacchelli
- Department of Biology, University of Bologna, Bologna, Italy
| | | | - Liliana Ruta
- Division of Child Neurology and Psychiatry, Department of Paediatrics, University of Catania, Catania, Italy
| | - Agatino Battaglia
- Stella Maris Clinical Research Institute for Child and Adolescent Neuropsychiatry, Pisa, Italy
| | - Luigi Mazzone
- Division of Child Neurology and Psychiatry, Department of Pediatrics, University of Catania, Catania, Italy
| | - Elena Maestrini
- Department of Biology, University of Bologna, Bologna, Italy
| | - Ana F. Sequeira
- Instituto Nacional de Saude Dr Ricardo Jorge, Lisbon, Portugal
- Instituto Gulbenkian de Ciencia, Oeiras, Portugal
- Center for Biodiversity, Functional and Integrative Genomics, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal
| | - Barbara Oliveira
- Instituto Nacional de Saude Dr Ricardo Jorge, Lisbon, Portugal
- Instituto Gulbenkian de Ciencia, Oeiras, Portugal
- Center for Biodiversity, Functional and Integrative Genomics, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal
| | - Astrid Vicente
- Instituto Nacional de Saude Dr Ricardo Jorge, Lisbon, Portugal
- Instituto Gulbenkian de Ciencia, Oeiras, Portugal
- Center for Biodiversity, Functional and Integrative Genomics, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal
| | - Guiomar Oliveira
- Unidade Neurodesenvolvimento e Autismo, Centro Investigação e Formação Clinica, Hospital Pediátrico Coimbra e Faculdade Medicina, Universidade Coimbra, Coimbra, Portugal
| | - Dalila Pinto
- The Centre for Applied Genomics and Program in Genetics and Genomic Biology, The Hospital for Sick Children, Toronto, Canada
| | - Stephen W. Scherer
- The Centre for Applied Genomics and Program in Genetics and Genomic Biology, The Hospital for Sick Children, Toronto, Canada
| | | | | | | | - Dominique Bonneau
- INSERM U771 and CNRS 6214, Angers, France
- Département de Biochimie et Génétique, Centre Hospitalier Universitaire, Angers, France
| | - Vincent Guinchat
- CADIPA–Centre de Ressources Autisme Rhône-Alpes, Saint Egrève, France
| | | | | | - Marie-Christine Mouren
- Assistance Publique-Hôpitaux de Paris, Robert Debré Hospital, Department of Child and Adolescent Psychiatry, Paris, France
| | - Marion Leboyer
- INSERM, U955, Psychiatrie Génétique, Créteil, France
- Université Paris Est, Faculté de Médecine, Créteil, France
- AP-HP, Hôpital H. Mondor–A. Chenevier, Département de Psychiatrie, Créteil, France
| | - Christopher Gillberg
- Gillberg Neuropsychiatry Centre, University of Gothenburg, Göteborg, Sweden
- Institute of Child Health, University College London, London, United Kingdom
| | | | - Thomas Bourgeron
- Human Genetics and Cognitive Functions, Institut Pasteur, Paris, France
- CNRS URA 2182 “Genes, synapses and cognition,” Institut Pasteur, Paris, France
- University Denis Diderot Paris 7, Paris, France
- * E-mail:
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65
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Genetics and Epigenetics of Autism Spectrum Disorders. RESEARCH AND PERSPECTIVES IN NEUROSCIENCES 2012. [DOI: 10.1007/978-3-642-27913-3_10] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Abstract
Structural variation, whether it is caused by copy number variants or present in a balanced form, such as reciprocal translocations and inversions, can have a profound and dramatic effect on the expression of genes mapping within and close to the rearrangement, as well as affecting others genome wide. These effects can be caused by altering the copy number of one or more genes or regulatory elements (dosage effect) or from physical disruption of links between regulatory elements and their associated gene or genes, resulting in perturbation of expression. Similarly, large-scale structural variants can result in genome-wide expression changes by altering the positions that chromosomes occupy within the nucleus, potentially disrupting not only local cis interactions, but also trans interactions that occur throughout the genome. Structural variation is, therefore, a significant factor in the study of gene expression and is discussed here in more detail.
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Affiliation(s)
- Louise Harewood
- The Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
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67
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Scoles HA, Urraca N, Chadwick SW, Reiter LT, Lasalle JM. Increased copy number for methylated maternal 15q duplications leads to changes in gene and protein expression in human cortical samples. Mol Autism 2011; 2:19. [PMID: 22152151 PMCID: PMC3287113 DOI: 10.1186/2040-2392-2-19] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2011] [Accepted: 12/12/2011] [Indexed: 11/23/2022] Open
Abstract
Background Duplication of chromosome 15q11-q13 (dup15q) accounts for approximately 3% of autism cases. Chromosome 15q11-q13 contains imprinted genes necessary for normal mammalian neurodevelopment controlled by a differentially methylated imprinting center (imprinting center of the Prader-Willi locus, PWS-IC). Maternal dup15q occurs as both interstitial duplications and isodicentric chromosome 15. Overexpression of the maternally expressed gene UBE3A is predicted to be the primary cause of the autistic features associated with dup15q. Previous analysis of two postmortem dup15q frontal cortical samples showed heterogeneity between the two cases, with one showing levels of the GABAA receptor genes, UBE3A and SNRPN in a manner not predicted by copy number or parental imprint. Methods Postmortem human brain tissue (Brodmann area 19, extrastriate visual cortex) was obtained from 8 dup15q, 10 idiopathic autism and 21 typical control tissue samples. Quantitative PCR was used to confirm duplication status. Quantitative RT-PCR and Western blot analyses were performed to measure 15q11-q13 transcript and protein levels, respectively. Methylation-sensitive high-resolution melting-curve analysis was performed on brain genomic DNA to identify the maternal:paternal ratio of methylation at PWS-IC. Results Dup15q brain samples showed a higher level of PWS-IC methylation than control or autism samples, indicating that dup15q was maternal in origin. UBE3A transcript and protein levels were significantly higher than control and autism in dup15q, as expected, although levels were variable and lower than expected based on copy number in some samples. In contrast, this increase in copy number did not result in consistently increased GABRB3 transcript or protein levels for dup15q samples. Furthermore, SNRPN was expected to be unchanged in expression in dup15q because it is expressed from the single unmethylated paternal allele, yet SNRPN levels were significantly reduced in dup15q samples compared to controls. PWS-IC methylation positively correlated with UBE3A and GABRB3 levels but negatively correlated with SNRPN levels. Idiopathic autism samples exhibited significantly lower GABRB3 and significantly more variable SNRPN levels compared to controls. Conclusions Although these results show that increased UBE3A/UBE3A is a consistent feature of dup15q syndrome, they also suggest that gene expression within 15q11-q13 is not based entirely on copy number but can be influenced by epigenetic mechanisms in brain.
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Affiliation(s)
- Haley A Scoles
- Medical Microbiology and Immunology, Genome Center, and Medical Institute of Neurodevelopmental Disorders, One Shields Avenue, University of California, Davis, Davis, CA 95616, USA.
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68
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Gordillo-González G, Hernández MP, Tamayo ML, Osorio G. A patient with convulsive syndrome and partial tetrasomy of chromosome 15. Neurologia 2011; 28:191-3. [PMID: 22078653 DOI: 10.1016/j.nrl.2011.09.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Revised: 07/29/2011] [Accepted: 09/11/2011] [Indexed: 11/29/2022] Open
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69
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Smith SEP, Zhou YD, Zhang G, Jin Z, Stoppel DC, Anderson MP. Increased gene dosage of Ube3a results in autism traits and decreased glutamate synaptic transmission in mice. Sci Transl Med 2011; 3:103ra97. [PMID: 21974935 PMCID: PMC3356696 DOI: 10.1126/scitranslmed.3002627] [Citation(s) in RCA: 204] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
People with autism spectrum disorder are characterized by impaired social interaction, reduced communication, and increased repetitive behaviors. The disorder has a substantial genetic component, and recent studies have revealed frequent genome copy number variations (CNVs) in some individuals. A common CNV that occurs in 1 to 3% of those with autism--maternal 15q11-13 duplication (dup15) and triplication (isodicentric extranumerary chromosome, idic15)--affects several genes that have been suggested to underlie autism behavioral traits. To test this, we tripled the dosage of one of these genes, the ubiquitin protein ligase Ube3a, which is expressed solely from the maternal allele in mature neurons, and reconstituted the three core autism traits in mice: defective social interaction, impaired communication, and increased repetitive stereotypic behavior. The penetrance of these autism traits depended on Ube3a gene copy number. In animals with increased Ube3a gene dosage, glutamatergic, but not GABAergic, synaptic transmission was suppressed as a result of reduced presynaptic release probability, synaptic glutamate concentration, and postsynaptic action potential coupling. These results suggest that Ube3a gene dosage may contribute to the autism traits of individuals with maternal 15q11-13 duplication and support the idea that increased E3A ubiquitin ligase gene dosage results in reduced excitatory synaptic transmission.
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Affiliation(s)
- Stephen E. P. Smith
- Beth Israel Deaconess Medical Center, Departments of Pathology and Neurology, Harvard Medical School, Boston, MA 02215, USA
| | - Yu-Dong Zhou
- Beth Israel Deaconess Medical Center, Departments of Pathology and Neurology, Harvard Medical School, Boston, MA 02215, USA
| | - Guangping Zhang
- Beth Israel Deaconess Medical Center, Departments of Pathology and Neurology, Harvard Medical School, Boston, MA 02215, USA
| | - Zhe Jin
- Beth Israel Deaconess Medical Center, Departments of Pathology and Neurology, Harvard Medical School, Boston, MA 02215, USA
| | - David C. Stoppel
- Beth Israel Deaconess Medical Center, Departments of Pathology and Neurology, Harvard Medical School, Boston, MA 02215, USA
- Program in Neuroscience, Harvard Medical School, Boston, MA 02215, USA
| | - Matthew P. Anderson
- Beth Israel Deaconess Medical Center, Departments of Pathology and Neurology, Harvard Medical School, Boston, MA 02215, USA
- Program in Neuroscience, Harvard Medical School, Boston, MA 02215, USA
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70
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Gene expression studies in autism: moving from the genome to the transcriptome and beyond. Neurobiol Dis 2011; 45:69-75. [PMID: 21839838 DOI: 10.1016/j.nbd.2011.07.017] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2011] [Accepted: 07/20/2011] [Indexed: 12/22/2022] Open
Abstract
Autism is a clinically and genetically heterogeneous neurodevelopmental disorder. Although multiple genes, risk alleles and copy number variants (CNVs) have been implicated in ASD, none of the currently established genetic causes of ASD accounts for more than 2% of the cases, and a genetic diagnosis is not yet possible for most autism patients. Thus, advancing our understanding of autism genetics requires the integration of genetic information with information on genome function, as provided by transcriptomic data. We review recent autism transcriptome studies, in the context of current knowledge of autism genetics, and discuss the utility of gene expression data in evaluating the functional relevance of genetic variants and identifying common molecular pathways dysregulated in autism.
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71
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Takumi T. The neurobiology of mouse models syntenic to human chromosome 15q. J Neurodev Disord 2011; 3:270-81. [PMID: 21789598 PMCID: PMC3261275 DOI: 10.1007/s11689-011-9088-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Accepted: 07/12/2011] [Indexed: 11/26/2022] Open
Abstract
Autism is a neurodevelopmental disorder that manifests in childhood as social behavioral abnormalities, such as abnormal social interaction, impaired communication, and restricted interest or behavior. Of the known causes of autism, duplication of human chromosome 15q11–q13 is the most frequently associated cytogenetic abnormality. Chromosome 15q11–q13 is also known to include imprinting genes. In terms of neuroscience, it contains interesting genes such as Necdin, Ube3a, and a cluster of GABAA subunits as well as huge clusters of non-coding RNAs (small nucleolar RNAs, snoRNAs). Phenotypic analyses of mice genetically or chromosomally engineered for each gene or their clusters on a region of mouse chromosome seven syntenic to human 15q11–q13 indicate that this region may be involved in social behavior, serotonin metabolism, and weight control. Further studies using these models will provide important clues to the pathophysiology of autism. This review overviews phenotypes of mouse models of genes in 15q11–q13 and their relationships to autism.
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Affiliation(s)
- Toru Takumi
- Laboratory of Integrative Bioscience, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami, Hiroshima, 734-8553, Japan,
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72
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LaSalle JM. A genomic point-of-view on environmental factors influencing the human brain methylome. Epigenetics 2011; 6:862-9. [PMID: 21617367 DOI: 10.4161/epi.6.7.16353] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The etiologic paradigm of complex human disorders such as autism is that genetic and environmental risk factors are independent and additive, but the interactive effects at the epigenetic interface are largely ignored. Genomic technologies have radically changed perspective on the human genome and how the epigenetic interface may impact complex human disorders. Here, I review recent genomic, environmental, and epigenetic findings that suggest a new paradigm of "integrative genomics" in which genetic variation in genomic size may be impacted by dietary and environmental factors that influence the genomic saturation of DNA methylation. Human genomes are highly repetitive, but the interface of large-scale genomic differences with environmental factors that alter the DNA methylome such as dietary folate is under-explored. In addition to obvious direct effects of some environmental toxins on the genome by causing chromosomal breaks, non-mutagenic toxin exposures correlate with DNA hypomethylation that can lead to rearrangements between repeats or increased retrotransposition. Since human neurodevelopment appears to be particularly sensitive to alterations in epigenetic pathways, a further focus will be on how developing neurons may be particularly impacted by even subtle alterations to DNA methylation and proposing new directions towards understanding the quixotic etiology of autism by integrative genomic approaches.
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Affiliation(s)
- Janine M LaSalle
- Medical Microbiology and Immunology, UC Davis School of Medicine, University of California, Davis, CA, USA.
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73
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Meguro-Horike M, Yasui DH, Powell W, Schroeder DI, Oshimura M, Lasalle JM, Horike SI. Neuron-specific impairment of inter-chromosomal pairing and transcription in a novel model of human 15q-duplication syndrome. Hum Mol Genet 2011; 20:3798-810. [PMID: 21725066 DOI: 10.1093/hmg/ddr298] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Although the etiology of autism remains largely unknown, cytogenetic and genetic studies have implicated maternal copy number gains of 15q11-q13 in 1-3% of autism cases. In order to understand how maternal 15q duplication leads to dysregulation of gene expression and altered chromatin interactions, we used microcell-mediated chromosome transfer to generate a novel maternal 15q duplication model in a human neuronal cell line. Our 15q duplication neuronal model revealed that by quantitative RT-PCR, transcript levels of NDN, SNRPN, GABRB3 and CHRNA7 were reduced compared with expected levels despite having no detectable alteration in promoter DNA methylation. Since 15q11-q13 alleles have been previously shown to exhibit homologous pairing in mature human neurons, we assessed homologous pairing of 15q11-q13 by fluorescence in situ hybridization. Homologous pairing of 15q11-q13 was significantly disrupted by 15q duplication. To further understand the extent and mechanism of 15q11-q13 homologous pairing, we mapped the minimal region of homologous pairing to a ∼500 kb region at the 3' end of GABRB3 which contains multiple binding sites for chromatin regulators MeCP2 and CTCF. Both active transcription and the chromatin factors MeCP2 and CTCF are required for the homologous pairing of 15q11-q13 during neuronal maturational differentiation. These data support a model where 15q11-q13 genes are regulated epigenetically at the level of both inter- and intra-chromosomal associations and that chromosome imbalance disrupts the epigenetic regulation of genes in 15q11-q13.
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Affiliation(s)
- Makiko Meguro-Horike
- Frontier Science Organization, Kanazawa University, 13-1 Takaramachi, Kanazawa, Japan.
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74
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Ploeger A, Galis F. Evolutionary approaches to autism- an overview and integration. Mcgill J Med 2011; 13:38. [PMID: 22363193 PMCID: PMC3277413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Autism is a highly heritable neurodevelopmental disorder, which greatly reduces reproductive success. The combination of high heritability and low reproductive success raises an evolutionary question: why was autism not eliminated by natural selection? We review different perspectives on the evolution of autism and propose an integration which emphasizes epistatic interactions between the effects of genes during development. It is well-established that autism is a polygenic disorder, and that the genes contributing to autism interact. If a disorder is polygenic, it is likely that the genes underlying the disorder are also involved in traits that are beneficial for the individual. For example, it is possible that genes involved in the development of autism are also involved in the development of intelligence. As intelligence is positively correlated with reproductive success, genes involved in autism can possibly spread in the population. We propose that in most individuals, the interactions between genes result in normal or high intelligence and the absence of autism. However, in some unlucky situations, often in combination with spontaneous negative mutations, the interactions between genes can lead to the development of autism (or other pathologies). Thus, the combination of high heritability and low reproductive success in autism can be explained from an evolutionary developmental perspective that emphasizes the role of epistatic interactions in polygenic disorders.
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Affiliation(s)
- Annemie Ploeger
- To whom correspondence should be addressed:
Annemie Ploeger
Department of Psychology, University of Amsterdam
Roetersstraat 15, 1018 WB Amsterdam, Netherlands
e-mail:
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75
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The molecular genetics of autism spectrum disorders: genomic mechanisms, neuroimmunopathology, and clinical implications. AUTISM RESEARCH AND TREATMENT 2011; 2011:398636. [PMID: 22937247 PMCID: PMC3420760 DOI: 10.1155/2011/398636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2010] [Accepted: 03/29/2011] [Indexed: 11/17/2022]
Abstract
Autism spectrum disorders (ASDs) have become increasingly common in recent years. The discovery of single-nucleotide polymorphisms and accompanying copy number variations within the genome has increased our understanding of the architecture of the disease. These genetic and genomic alterations coupled with epigenetic phenomena have pointed to a neuroimmunopathological mechanism for ASD. Model animal studies, developmental biology, and affective neuroscience laid a foundation for dissecting the neural pathways impacted by these disease-generating mechanisms. The goal of current autism research is directed toward a systems biological approach to find the most basic genetic and environmental causes to this severe developmental disease. It is hoped that future genomic and neuroimmunological research will be directed toward finding the road toward prevention, treatment, and cure of ASD.
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76
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Michelson M, Eden A, Vinkler C, Leshinsky-Silver E, Kremer U, Lerman-Sagie T, Lev D. Familial partial trisomy 15q11-13 presenting as intractable epilepsy in the child and schizophrenia in the mother. Eur J Paediatr Neurol 2011; 15:230-3. [PMID: 21145272 DOI: 10.1016/j.ejpn.2010.11.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Revised: 11/12/2010] [Accepted: 11/13/2010] [Indexed: 11/30/2022]
Abstract
Various rearrangements involve the proximal long arm of chromosome 15, including deletions, duplications, translocations, inversions and supernumerary marker chromosome of an inverted duplication. The large marker 15, that contains the Prader-Willi syndrome (PWS)/Angelman syndrome (AS) chromosome region, is usually associated with an abnormal phenotype of moderate to severe mental retardation, seizures, poor motor coordination, early-onset central hypotonia, autism and autistic-like behavior, schizophrenia and mild dysmorphic features. We report a ten year-old girl with normal intelligence prior to the onset of seizures, who developed severe intractable epilepsy at the age of seven years. Family history was significant for a mother with recurrent episodes of acute psychosis. The patient's and mother's karyotype revealed 47,XX+m. Array comparative genomic hybridization (A-CGH) identified a gain of 13 BAC clones from 15q11.2 through 15q13.1, which was then confirmed by FISH to be part of the marker chromosome. This duplicated region contains the SNRPN/UBE3A locus. This case demonstrates that a duplication of 15q11-13 can present differently in the same family either as intractable epilepsy or as a psychiatric illness and that intelligence can be preserved. We suggest that CGH microarray should be performed in cases with intractable epilepsy or schizophrenia, with or without mental retardation.
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Affiliation(s)
- Marina Michelson
- Institute of Medical Genetics, Wolfson Medical Center, 58100 Holon, Israel
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77
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Manolakos E, Sarri C, Vetro A, Kefalas K, Leze E, Sofocleus C, Kitsos G, Merou K, Kokotas H, Papadopoulou A, Attilakos A, Petersen MB, Kitsiou-Tzeli S. Combined 22q11.1-q11.21 deletion with 15q11.2-q13.3 duplication identified by array-CGH in a 6 years old boy. Mol Cytogenet 2011; 4:6. [PMID: 21345209 PMCID: PMC3058102 DOI: 10.1186/1755-8166-4-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Accepted: 02/23/2011] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Deletions of chromosome 22q11 are present in over 90% of cases of DiGeorge or Velo-Cardio-Facial syndrome (DGS/VCFS). 15q11-q13 duplication is another recognized syndrome due to rearrangements of several genes, belonging to the category of imprinted genes. The phenotype of this syndrome varies but has been clearly associated with developmental delay and autistic spectrum disorders. Co-existence of the two syndromes has not been reported so far. RESULTS Here we report a 6-year-old boy presenting growth retardation, dysmorphic features and who exhibited learning difficulties. Fluorescence in situ hybridization (FISH) analysis of the proband revealed a deletion of DiGeorge Syndrome critical region (TUPLE). Array-CGH analysis revealed an interstitial duplication of 12 Mb in size in the area 15q11.2-q13.3, combined with a 3.2 Mb deletion at region 22q11.1-q11.21. FISH analysis in the mother showed a cryptic balanced translocation between chromosome 15 and chromosome 22 (not evident by classic karyotyping). DISCUSION: The clinical manifestations could be related to both syndromes and the importance of array-CGH analysis in cases of unexplained developmental delay is emphasized. The present case further demonstrates how molecular cytogenetic techniques applied in the parents were necessary for the genetic counseling of the family.
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78
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Huang HS, Cheung I, Akbarian S. RPP25 is developmentally regulated in prefrontal cortex and expressed at decreased levels in autism spectrum disorder. Autism Res 2011; 3:153-61. [PMID: 20632321 DOI: 10.1002/aur.141] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Dysfunction of cerebral cortex in autism is thought to involve alterations in inhibitory neurotransmission. Here, we screened, in prefrontal cortex (PFC) of 15 subjects diagnosed with autism and 15 matched controls the expression of 44 transcripts that are either preferentially expressed in gamma-aminobutyric acidergic interneurons of the mature cortex or important for the development of inhibitory circuitry. Significant alterations in the autism cohort included decreased expression (-45%) of RPP25 (15q24.1), which is located within the autism susceptibility locus, 15q22-26. RPP25, which encodes the 25 kDa subunit of ribonuclease P involved in tRNA and pre-ribosomal RNA processing, was developmentally regulated in cerebral cortex with peak levels of expression during late fetal development (human) or around birth (mouse). In the PFC, RPP25 chromatin showed high levels of histone H3-lysine 4 trimethylation, an epigenetic mark associated with transcriptional regulation. Unexpectedly, and in contrast to peripheral tissues, levels of RPP25 protein remained undetectable in fetal and adult cerebral cortex. Taken together, these findings suggest a potential role for the RPP25 gene transcript in the neurobiology of developmental brain disorders.
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Affiliation(s)
- Hsien-Sung Huang
- Department of Psychiatry, Brudnick Neuropsychiatric Research Institute, Worcester, Massachusetts, USA
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79
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Delahanty RJ, Kang J, Brune CW, Kistner EO, Courchesne E, Cox NJ, Cook EH, Macdonald RL, Sutcliffe JS. Maternal transmission of a rare GABRB3 signal peptide variant is associated with autism. Mol Psychiatry 2011; 16:86-96. [PMID: 19935738 PMCID: PMC3428055 DOI: 10.1038/mp.2009.118] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Maternal 15q11-q13 duplication is the most common copy number variant in autism, accounting for ∼1-3% of cases. The 15q11-q13 region is subject to epigenetic regulation, and genomic copy number losses and gains cause genomic disorders in a parent-of-origin-specific manner. One 15q11-q13 locus encodes the GABA(A) receptor β3 subunit gene (GABRB3), which has been implicated by several studies in both autism and absence epilepsy, and the co-morbidity of epilepsy in autism is well established. We report that maternal transmission of a GABRB3 signal peptide variant (P11S), previously implicated in childhood absence epilepsy, is associated with autism. An analysis of wild-type and mutant β3 subunit-containing α1β3γ2 or α3β3γ2 GABA(A) receptors shows reduced whole-cell current and decreased β3 subunit protein on the cell surface due to impaired intracellular β3 subunit processing. We thus provide the first evidence of an association between a specific GABA(A) receptor defect and autism, direct evidence that this defect causes synaptic dysfunction that is autism relevant and the first maternal risk effect in the 15q11-q13 autism duplication region that is linked to a coding variant.
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Affiliation(s)
- Ryan J. Delahanty
- Department of Molecular Physiology & Biophysics, Vanderbilt University, Nashville, TN
| | - Jingqiong Kang
- Department of Neurology, Vanderbilt University, Nashville, TN
| | - Camille W. Brune
- Department of Psychiatry, Institute for Juvenile Research, University of Illinois at Chicago, Chicago, IL
| | - Emily O. Kistner
- Department of Health Studies, The University of Chicago, Chicago, IL
| | - Eric Courchesne
- Department of Neurosciences, University of California San Diego, La Jolla, CA
| | - Nancy J. Cox
- Department of Medicine, The University of Chicago, Chicago, IL
| | - Edwin H. Cook
- Department of Psychiatry, Institute for Juvenile Research, University of Illinois at Chicago, Chicago, IL
| | | | - James S. Sutcliffe
- Department of Molecular Physiology & Biophysics, Vanderbilt University, Nashville, TN,Department of Psychiatry, Vanderbilt University, Nashville, TN
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Kitsiou-Tzeli S, Tzetis M, Sofocleous C, Vrettou C, Xaidara A, Giannikou K, Pampanos A, Mavrou A, Kanavakis E. De novo interstitial duplication of the 15q11.2-q14 PWS/AS region of maternal origin: Clinical description, array CGH analysis, and review of the literature. Am J Med Genet A 2010; 152A:1925-32. [PMID: 20575009 DOI: 10.1002/ajmg.a.33447] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The 15q11-q13 PWS/AS critical region involves genes that are characterized by genomic imprinting. Multiple repeat elements within the region mediate rearrangements, including interstitial duplications, interstitial triplications, and supernumerary isodicentric marker chromosomes, as well as the deletions that cause Prader-Willi syndrome (PWS) and Angelman syndrome (AS). Recently, duplications of maternal origin concerning the same critical region have been implicated in autism spectrum disorders (ASD). We present a 6-month-old girl carrying a de novo duplication of maternal origin of the 15q11.2-q14 PWS/AS region (17.73 Mb in size) [46,XX,dup(15)(q11.2-q14)] detected with a high-resolution microarray-based comparative genomic hybridization (array-CGH). The patient is characterized by severe hypotonia, obesity, microstomia, long eyelashes, hirsutism, microretrognathia, short nose, severe psychomotor retardation, and multiple episodes of drug-resistant epileptic seizures, while her brain magnetic resonance imaging (MRI) documented partial corpus callosum dysplasia. In our patient the duplicated region is quite large extending beyond the Prader-Willi-Angelman critical region (PWACR), containing a number of genes that have been shown to be involved in ASD, exhibiting a severe phenotype, beyond the typical PWS/AS clinical manifestations. Reporting of similar well-characterized clinical cases with clearly delineated breakpoints of the duplicated region will clarify the contribution of specific genes to the phenotype.
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Affiliation(s)
- Sophia Kitsiou-Tzeli
- Department of Medical Genetics, Medical School, University of Athens, Athens, Greece
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Fatemi SH, Reutiman TJ, Folsom TD, Rooney RJ, Patel DH, Thuras PD. mRNA and protein levels for GABAAalpha4, alpha5, beta1 and GABABR1 receptors are altered in brains from subjects with autism. J Autism Dev Disord 2010; 40:743-50. [PMID: 20066485 DOI: 10.1007/s10803-009-0924-z] [Citation(s) in RCA: 137] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
We have shown altered expression of gamma-aminobutyric acid A (GABA(A)) and gamma-aminobutyric acid B (GABA(B)) receptors in the brains of subjects with autism. In the current study, we sought to verify our western blotting data for GABBR1 via qRT-PCR and to expand our previous work to measure mRNA and protein levels of 3 GABA(A) subunits previously associated with autism (GABRalpha4; GABRalpha5; GABRbeta1). Three GABA receptor subunits demonstrated mRNA and protein level concordance in superior frontal cortex (GABRalpha4, GABRalpha5, GABRbeta1) and one demonstrated concordance in cerebellum (GABBetaR1). These results provide further evidence of impairment of GABAergic signaling in autism.
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Affiliation(s)
- S Hossein Fatemi
- Department of Psychiatry, Division of Neuroscience Research, University of Minnesota School of Medicine, 420 Delaware St SE MMC 392, Minneapolis, MN 55455, USA.
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Kleefstra T, de Leeuw N, Wolf R, Nillesen WM, Schobers G, Mieloo H, Willemsen M, Perrotta CS, Poddighe PJ, Feenstra I, Draaisma J, van Ravenswaaij-Arts CM. Phenotypic spectrum of 20 novel patients with molecularly defined supernumerary marker chromosomes 15 and a review of the literature. Am J Med Genet A 2010; 152A:2221-9. [DOI: 10.1002/ajmg.a.33529] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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83
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The prevalence of epigenetic mechanisms in the regulation of cognitive functions and behaviour. Curr Opin Neurobiol 2010; 20:441-9. [DOI: 10.1016/j.conb.2010.04.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2010] [Revised: 04/13/2010] [Accepted: 04/13/2010] [Indexed: 11/17/2022]
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Grafodatskaya D, Chung B, Szatmari P, Weksberg R. Autism spectrum disorders and epigenetics. J Am Acad Child Adolesc Psychiatry 2010; 49:794-809. [PMID: 20643313 DOI: 10.1016/j.jaac.2010.05.005] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Revised: 05/05/2010] [Accepted: 05/10/2010] [Indexed: 10/18/2022]
Abstract
OBJECTIVE Current research suggests that the causes of autism spectrum disorders (ASD) are multifactorial and include both genetic and environmental factors. Several lines of evidence suggest that epigenetics also plays an important role in ASD etiology and that it might, in fact, integrate genetic and environmental influences to dysregulate neurodevelopmental processes. The objective of this review is to illustrate how epigenetic modifications that are known to alter gene expression without changing primary DNA sequence may play a role in the etiology of ASD. METHOD In this review, we summarize current knowledge about epigenetic modifications to genes and genomic regions possibly involved in the etiology of ASD. RESULTS Several genetic syndromes comorbid with ASD, which include Rett, Fragile X, Prader-Willi, Angelman, and CHARGE (Coloboma of the eye, Heart defects, Atresia of the nasal choanae, Retardation of growth and/or development, Genital and/or urinary abnormalities, and Ear abnormalities and deafness), all demonstrate dysregulation of epigenetic marks or epigenetic mechanisms. We report also on genes or genomic regions exhibiting abnormal epigenetic regulation in association with either syndromic (15q11-13 maternal duplication) or nonsyndromic forms of ASD. Finally, we discuss the state of current knowledge regarding the etiologic role of environmental factors linked to both the development of ASD and epigenetic dysregulation. CONCLUSION Data reviewed in this article highlight a variety of situations in which epigenetic dysregulation is associated with the development of ASD, thereby supporting a role for epigenetics in the multifactorial etiologies of ASD.
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van Bokhoven H, Kramer JM. Disruption of the epigenetic code: an emerging mechanism in mental retardation. Neurobiol Dis 2010; 39:3-12. [PMID: 20304068 DOI: 10.1016/j.nbd.2010.03.010] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2009] [Revised: 03/10/2010] [Accepted: 03/12/2010] [Indexed: 01/18/2023] Open
Abstract
Mental retardation (MR) is a highly diverse group of cognitive disorders. Gene defects account for about half of all patients and mutations causative for impaired cognition have been identified in more than 400 genes. While there are numerous genetic defects underlying MR, a more limited number of pathways is emerging whose disruption appears to be shared by groups of MR genes. One of these common pathways is composed of MR genes that encode regulators of chromatin structure and of chromatin-mediated transcription regulation. Already more than 20 "epigenetic MR genes" have been identified and this number is likely to increase in the coming years when deep sequencing of exomes and genomes will become commonplace. Prominent examples of epigenetic MR genes include the methyl CpG-binding protein MECP2 and the CREB binding protein, CBP. Interestingly, several epigenetic MR proteins have been found to interact directly with one another or act together in complexes that regulate the local chromatin structure at target genes. Thus, it appears that the functions of individual epigenetic MR proteins converge onto similar biological processes that are crucial to neuronal processes. The next challenge will be to gain more insight into patterns of altered DNA methylation and histone modifications that are caused by epigenetic gene mutations and how these will disrupt the brain-specific expression of target genes. Such research may reveal that a wide variety of mutations in the genetic code result in a more limited number of disruptions to the epigenetic code. If so, this will provide a rationale for therapeutic strategies.
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Affiliation(s)
- Hans van Bokhoven
- Department of Human Genetics, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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Chamberlain SJ, Lalande M. Neurodevelopmental disorders involving genomic imprinting at human chromosome 15q11-q13. Neurobiol Dis 2010; 39:13-20. [PMID: 20304067 DOI: 10.1016/j.nbd.2010.03.011] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Revised: 03/09/2010] [Accepted: 03/12/2010] [Indexed: 10/19/2022] Open
Abstract
Human chromosome 15q11-q13 is subject to regulation by genomic imprinting, an epigenetic process by which genes are expressed in a parent-of-origin specific manner. Three neurodevelopmental disorders, Prader-Willi syndrome, Angelman syndrome, and 15q duplication syndrome, result from aberrant expression of imprinted genes in this region. Here, we review the current literature pertaining to mouse models and recently identified patients with atypical deletions, which shed light on the epigenetic regulation of the chromosome 15q11-q13 subregion and the genes that are responsible for the phenotypic outcomes of these disorders.
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Affiliation(s)
- Stormy J Chamberlain
- Department of Genetics and Developmental Biology, University of Connecticut Health Center, MC3301, 263 Farmington Ave., Farmington, CT 06030, USA.
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Qureshi IA, Mehler MF. Epigenetic mechanisms underlying human epileptic disorders and the process of epileptogenesis. Neurobiol Dis 2010; 39:53-60. [PMID: 20188170 DOI: 10.1016/j.nbd.2010.02.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2009] [Revised: 02/10/2010] [Accepted: 02/13/2010] [Indexed: 10/19/2022] Open
Abstract
The rapidly emerging science of epigenetics and epigenomic medicine promises to reveal novel insights into the susceptibility to and the onset and progression of epileptic disorders. Epigenetic regulatory mechanisms are now implicated in orchestrating aspects of neural development (e.g., cell fate specification and maturation), homeostasis and stress responses (e.g., immediate early gene transcription), and neural network function (e.g., excitation-inhibition coupling and activity-dependent plasticity). These same neurobiological processes are responsible for determining the heterogeneous features of complex epileptic disease states. Thus, we highlight recent evidence that is beginning to elucidate the specific roles played by epigenetic mechanisms, including DNA methylation, histone code modifications and chromatin remodeling, noncoding RNAs and RNA editing, in human epilepsy syndromes and in the process of epileptogenesis. The highly integrated layers of the epigenome are responsible for the cell type specific and exquisitely environmentally responsive deployment of genes and functional gene networks that underlie the molecular pathophysiology of epilepsy and its associated comorbidities, including but not limited to neurotransmitter receptors (e.g., GluR2, GLRA2, and GLRA3), growth factors (e.g., BDNF), extracellular matrix proteins (e.g., RELN), and diverse transcriptional regulators (e.g., CREB, c-fos, and c-jun). These important observations suggest that future epigenetic studies are necessary to better understand, classify, prevent, and treat epileptic disorders.
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Affiliation(s)
- Irfan A Qureshi
- Rosyln and Leslie Goldstein Laboratory for Stem Cell Biology and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA.
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The inv dup (15) or idic (15) syndrome (Tetrasomy 15q). Orphanet J Rare Dis 2008; 3:30. [PMID: 19019226 PMCID: PMC2613132 DOI: 10.1186/1750-1172-3-30] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Accepted: 11/19/2008] [Indexed: 12/03/2022] Open
Abstract
The inv dup(15) or idic(15) syndrome displays distinctive clinical findings represented by early central hypotonia, developmental delay and intellectual disability, epilepsy, and autistic behaviour. Incidence at birth is estimated at 1 in 30,000 with a sex ratio of almost 1:1. Developmental delay and intellectual disability affect all individuals with inv dup(15) and are usually moderate to profound. Expressive language is absent or very poor and often echolalic. Comprehension is very limited and contextual. Intention to communicate is absent or very limited. The distinct behavioral disorder shown by children and adolescents has been widely described as autistic or autistic-like. Epilepsy with a wide variety of seizure types can occur in these individuals, with onset between 6 months and 9 years. Various EEG abnormalities have been described. Muscle hypotonia is observed in almost all individuals, associated, in most of them, with joint hyperextensibility and drooling. Facial dysmorphic features are absent or subtle, and major malformations are rare. Feeding difficulties are reported in the newborn period. Chromosome region 15q11q13, known for its instability, is highly susceptible to clinically relevant genomic rearrangements, such as supernumerary marker chromosomes formed by the inverted duplication of proximal chromosome 15. Inv dup(15) results in tetrasomy 15p and partial tetrasomy 15q. The large rearrangements, containing the Prader-Willi/Angelman syndrome critical region (PWS/ASCR), are responsible for the inv dup(15) or idic(15) syndrome. Diagnosis is achieved by standard cytogenetics and FISH analysis, using probes both from proximal chromosome 15 and from the PWS/ASCR. Microsatellite analysis on parental DNA or methylation analysis on the proband DNA, are also needed to detect the parent-of-origin of the inv dup(15) chromosome. Array CGH has been shown to provide a powerful approach for identifying and detecting the extent of the duplication. The possible occurrence of double supernumerary isodicentric chromosomes derived from chromosome 15, resulting in partial hexasomy of the maternally inherited PWS/ASCR, should be considered in the differential diagnosis. Large idic(15) are nearly always sporadic. Antenatal diagnosis is possible. Management of inv dup(15) includes a comprehensive neurophysiologic and developmental evaluation. Survival is not significantly reduced. The inv dup(15) or idic(15) syndrome can also be termed "tetrasomy 15q". About 160 patients have been reported in the medical literature [1-5].
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