1
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Renigunta V, Xhaferri N, Shaikh IG, Schlegel J, Bisen R, Sanvido I, Kalpachidou T, Kummer K, Oliver D, Leitner MG, Lindner M. A versatile functional interaction between electrically silent K V subunits and K V7 potassium channels. Cell Mol Life Sci 2024; 81:301. [PMID: 39003683 PMCID: PMC11335225 DOI: 10.1007/s00018-024-05312-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 05/23/2024] [Accepted: 06/10/2024] [Indexed: 07/15/2024]
Abstract
Voltage-gated K+ (KV) channels govern K+ ion flux across cell membranes in response to changes in membrane potential. They are formed by the assembly of four subunits, typically from the same family. Electrically silent KV channels (KVS), however, are unable to conduct currents on their own. It has been assumed that these KVS must obligatorily assemble with subunits from the KV2 family into heterotetrameric channels, thereby giving rise to currents distinct from those of homomeric KV2 channels. Herein, we show that KVS subunits indeed also modulate the activity, biophysical properties and surface expression of recombinant KV7 isoforms in a subunit-specific manner. Employing co-immunoprecipitation, and proximity labelling, we unveil the spatial coexistence of KVS and KV7 within a single protein complex. Electrophysiological experiments further indicate functional interaction and probably heterotetramer formation. Finally, single-cell transcriptomic analyses identify native cell types in which this KVS and KV7 interaction may occur. Our findings demonstrate that KV cross-family interaction is much more versatile than previously thought-possibly serving nature to shape potassium conductance to the needs of individual cell types.
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Affiliation(s)
- Vijay Renigunta
- Department of Neurophysiology, Institute of Physiology and Pathophysiology, Philipps-University Marburg, 35037, Marburg, Germany
| | - Nermina Xhaferri
- Department of Neurophysiology, Institute of Physiology and Pathophysiology, Philipps-University Marburg, 35037, Marburg, Germany
| | - Imran Gousebasha Shaikh
- Department of Neurophysiology, Institute of Physiology and Pathophysiology, Philipps-University Marburg, 35037, Marburg, Germany
| | - Jonathan Schlegel
- Department of Neurophysiology, Institute of Physiology and Pathophysiology, Philipps-University Marburg, 35037, Marburg, Germany
| | - Rajeshwari Bisen
- Department of Neurophysiology, Institute of Physiology and Pathophysiology, Philipps-University Marburg, 35037, Marburg, Germany
| | - Ilaria Sanvido
- Institute of Physiology, Medical University of Innsbruck, Innsbruck, Austria
| | | | - Kai Kummer
- Institute of Physiology, Medical University of Innsbruck, Innsbruck, Austria
| | - Dominik Oliver
- Department of Neurophysiology, Institute of Physiology and Pathophysiology, Philipps-University Marburg, 35037, Marburg, Germany
| | - Michael G Leitner
- Institute of Physiology, Medical University of Innsbruck, Innsbruck, Austria.
| | - Moritz Lindner
- Department of Neurophysiology, Institute of Physiology and Pathophysiology, Philipps-University Marburg, 35037, Marburg, Germany.
- The Nuffield Laboratory of Ophthalmology, Sleep and Circadian Neuroscience Institute, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK.
- Department of Ophthalmology, Philipps University Marburg, 35037, Marburg, Germany.
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Kinsey N, Belanger JM, Mandigers PJJ, Leegwater PA, Heinonen T, Hytönen MK, Lohi H, Ostrander EA, Oberbauer AM. Idiopathic Epilepsy Risk Allele Trends in Belgian Tervuren: A Longitudinal Genetic Analysis. Genes (Basel) 2024; 15:114. [PMID: 38255002 PMCID: PMC10815166 DOI: 10.3390/genes15010114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/11/2024] [Accepted: 01/17/2024] [Indexed: 01/24/2024] Open
Abstract
Idiopathic epilepsy (IE) has been known to be inherited in the Belgian Tervuren for many decades. Risk genotypes for IE in this breed have recently been identified on Canis familiaris chromosomes (CFA) 14 and 37. In the current study, the allele frequencies of these loci were analyzed to determine whether dog breeders had employed a purposeful selection against IE, leading to a reduction in risk-associated allele frequency within the breed over time. The allele frequencies of two generational groupings of Belgian Tervuren with and without IE were compared. Allele frequencies for risk-associated alleles on CFA14 were unchanged between 1985 and 2015, whereas those on CFA37 increased during that time in the control population (p < 0.05). In contrast, dogs with IE showed a decrease (p < 0.05) in the IE risk-associated allele frequency at the CFA37 locus. Seizure prevalence in the Belgian Tervuren appears to be increasing. These results suggest that, despite awareness that IE is inherited, selection against IE has not been successful.
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Affiliation(s)
- Nathan Kinsey
- Department of Animal Science, University of California, Davis, CA 95616, USA; (N.K.); (J.M.B.)
| | - Janelle M. Belanger
- Department of Animal Science, University of California, Davis, CA 95616, USA; (N.K.); (J.M.B.)
| | - Paul J. J. Mandigers
- Department of Clinical Sciences, Utrecht University, Yalelaan 108, 3584 CM Utrecht, The Netherlands; (P.J.J.M.); (P.A.L.)
| | - Peter A. Leegwater
- Department of Clinical Sciences, Utrecht University, Yalelaan 108, 3584 CM Utrecht, The Netherlands; (P.J.J.M.); (P.A.L.)
| | - Tiina Heinonen
- Department of Medical and Clinical Genetics, University of Helsinki, 00014 Helsinki, Finland; (T.H.); (M.K.H.); (H.L.)
- Department of Veterinary Biosciences, University of Helsinki, 00014 Helsinki, Finland
- Folkhälsan Research Center, 00290 Helsinki, Finland
| | - Marjo K. Hytönen
- Department of Medical and Clinical Genetics, University of Helsinki, 00014 Helsinki, Finland; (T.H.); (M.K.H.); (H.L.)
- Department of Veterinary Biosciences, University of Helsinki, 00014 Helsinki, Finland
- Folkhälsan Research Center, 00290 Helsinki, Finland
| | - Hannes Lohi
- Department of Medical and Clinical Genetics, University of Helsinki, 00014 Helsinki, Finland; (T.H.); (M.K.H.); (H.L.)
- Department of Veterinary Biosciences, University of Helsinki, 00014 Helsinki, Finland
- Folkhälsan Research Center, 00290 Helsinki, Finland
| | - Elaine A. Ostrander
- National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA;
| | - Anita M. Oberbauer
- Department of Animal Science, University of California, Davis, CA 95616, USA; (N.K.); (J.M.B.)
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Gao X, You Z, Huang C, Liu Z, Tan Z, Li J, Liu Y, Liu X, Wei F, Fan Z, Qi S, Sun J. NCBP1 Improves Cognitive Function in Mice by Reducing Oxidative Stress, Neuronal Loss, and Glial Activation After Status Epilepticus. Mol Neurobiol 2023; 60:6676-6688. [PMID: 37474884 DOI: 10.1007/s12035-023-03497-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Accepted: 07/10/2023] [Indexed: 07/22/2023]
Abstract
Status epilepticus (SE) is a severe manifestation of epilepsy which can cause neurologic injury and death. This study aimed to identify key proteins involved in the pathogenesis of epilepsy and find a potential drug target for SE treatment. Tandem mass tag (TMT)-based quantitative proteomic analysis was applied to screen differentially expressed proteins (DEPs) in epilepsy. The adeno-associated virus was employed to overexpress candidate DEP in mice, and kainic acid (KA) was used to generate a mouse model of epilepsy. Then histopathological examination of the hippocampal tissue was performed, and the inflammatory factors levels in serum and hippocampus were measured. The IP-MS analysis was carried out to identify the interacting protein of nuclear cap-binding protein 1 (NCBP1). The results were that NCBP1 was downregulated in the epileptic hippocampus. NCBP1 overexpression alleviated KA-induced cognitive impairment in mice and reduced the apoptosis and damage of hippocampal neurons. Additionally, overexpressed NCBP1 increased the expression of NeuN and reduced the expression of GFAP and IBA-1 in the hippocampus of the mice. Further study indicated that NCBP1 overexpression inhibited the expression of IL-6, IL-1β, and IFN-γ in serum and hippocampus as well as MDA and LDH in the hippocampus, whereas it increased the SOD levels, suggesting that overexpression of NCBP1 could diminish KA-induced inflammatory responses and oxidative stress. The IP-MS analysis identified that ELAVL4 was the NCBP1-interacting protein. In conclusion, this finding suggests that NCBP1 may potentially serve as a drug target for the treatment of epilepsy.
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Affiliation(s)
- Xiaoying Gao
- Department of Anesthesiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Zhipeng You
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Cong Huang
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Zhixiong Liu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Zixiao Tan
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Jiran Li
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Yang Liu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Xingan Liu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Fan Wei
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Zhijie Fan
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China
| | - Sihua Qi
- Department of Anesthesiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China.
| | - Jiahang Sun
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, Heilongjiang, China.
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Belanger JM, Heinonen T, Famula TR, Mandigers PJJ, Leegwater PA, Hytönen MK, Lohi H, Oberbauer AM. Validation of a Chromosome 14 Risk Haplotype for Idiopathic Epilepsy in the Belgian Shepherd Dog Found to Be Associated with an Insertion in the RAPGEF5 Gene. Genes (Basel) 2022; 13:genes13071124. [PMID: 35885906 PMCID: PMC9323784 DOI: 10.3390/genes13071124] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/19/2022] [Accepted: 06/21/2022] [Indexed: 12/04/2022] Open
Abstract
An idiopathic epilepsy (IE) risk haplotype on canine chromosome (CFA) 14 has been reported to interact with the CFA37 common risk haplotype in the Belgian shepherd (BS). Additional IE cases and control dogs were genotyped for the risk haplotypes to validate these previous findings. In the new cohort, the interaction between the two regions significantly elevated IE risk. When the haplotypes were analyzed individually, particular haplotypes on both CFA14 (ACTG) and 37 (GG) were associated with elevated IE risk, though only the CFA37 AA was significantly associated (p < 0.003) with reduced risk in the new cohort. However, the CFA14 ACTG risk was statistically significant when the new and previous cohort data were combined. The frequency of the ACTG haplotype was four-fold higher in BS dogs than in other breeds. Whole genome sequence analysis revealed that a 3-base pair predicted disruptive insertion in the RAPGEF5 gene, which is adjacent to the CFA14 risk haplotype. RAPGEF5 is involved in the Wnt-β-catenin signaling pathway that is crucial for normal brain function. Although this risk variant does not fully predict the likelihood of a BS developing IE, the association with a variant in a candidate gene may provide insight into the genetic control of canine IE.
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Affiliation(s)
- Janelle M. Belanger
- Department of Animal Science, University of California, Davis, CA 95616, USA; (J.M.B.); (T.R.F.)
| | - Tiina Heinonen
- Department of Medical and Clinical Genetics, University of Helsinki, 00014 Helsinki, Finland; (T.H.); (M.K.H.); (H.L.)
- Department of Veterinary Biosciences, University of Helsinki, 00014 Helsinki, Finland
- Folkhälsan Research Center, 00290 Helsinki, Finland
| | - Thomas R. Famula
- Department of Animal Science, University of California, Davis, CA 95616, USA; (J.M.B.); (T.R.F.)
| | - Paul J. J. Mandigers
- Department of Clinical Sciences, Utrecht University, Yalelaan 108, 3584 CM Utrecht, The Netherlands; (P.J.J.M.); (P.A.L.)
| | - Peter A. Leegwater
- Department of Clinical Sciences, Utrecht University, Yalelaan 108, 3584 CM Utrecht, The Netherlands; (P.J.J.M.); (P.A.L.)
| | - Marjo K. Hytönen
- Department of Medical and Clinical Genetics, University of Helsinki, 00014 Helsinki, Finland; (T.H.); (M.K.H.); (H.L.)
- Department of Veterinary Biosciences, University of Helsinki, 00014 Helsinki, Finland
- Folkhälsan Research Center, 00290 Helsinki, Finland
| | - Hannes Lohi
- Department of Medical and Clinical Genetics, University of Helsinki, 00014 Helsinki, Finland; (T.H.); (M.K.H.); (H.L.)
- Department of Veterinary Biosciences, University of Helsinki, 00014 Helsinki, Finland
- Folkhälsan Research Center, 00290 Helsinki, Finland
| | - Anita M. Oberbauer
- Department of Animal Science, University of California, Davis, CA 95616, USA; (J.M.B.); (T.R.F.)
- Correspondence: ; Tel.: +1-530-752-5484
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A novel insight into differential expression profiles of sporadic cerebral cavernous malformation patients with different symptoms. Sci Rep 2021; 11:19351. [PMID: 34588521 PMCID: PMC8481309 DOI: 10.1038/s41598-021-98647-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 09/09/2021] [Indexed: 02/08/2023] Open
Abstract
Cerebral cavernous malformation (CCM) is a vascular lesion of the central nervous system that may lead to distinct symptoms among patients including cerebral hemorrhages, epileptic seizures, focal neurologic deficits, and/or headaches. Disease-related mutations were identified previously in one of the three CCM genes: CCM1, CCM2, and CCM3. However, the rate of these mutations in sporadic cases is relatively low, and new studies report that mutations in CCM genes may not be sufficient to initiate the lesions. Despite the growing body of research on CCM, the underlying molecular mechanism has remained largely elusive. In order to provide a novel insight considering the specific manifested symptoms, CCM patients were classified into two groups (as Epilepsy and Hemorrhage). Since the studied patients experience various symptoms, we hypothesized that the underlying cause for the disease may also differ between those groups. To this end, the respective transcriptomes were compared to the transcriptomes of the control brain tissues and among each other. This resulted into the identification of the differentially expressed coding genes and the delineation of the corresponding differential expression profile for each comparison. Notably, some of those differentially expressed genes were previously implicated in epilepsy, cell structure formation, and cell metabolism. However, no CCM1-3 gene deregulation was detected. Interestingly, we observed that when compared to the normal controls, the expression of some identified genes was only significantly altered either in Epilepsy (EGLN1, ELAVL4, and NFE2l2) or Hemorrhage (USP22, EYA1, SIX1, OAS3, SRMS) groups. To the best of our knowledge, this is the first such effort focusing on CCM patients with epileptic and hemorrhagic symptoms with the purpose of uncovering the potential CCM-related genes. It is also the first report that presents a gene expression dataset on Turkish CCM patients. The results suggest that the new candidate genes should be explored to further elucidate the CCM pathology. Overall, this work constitutes a step towards the identification of novel potential genetic targets for the development of possible future therapies.
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6
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Wang W, Li H, Yan J, Zhang H, Li X, Zheng S, Wang J, Xing Y, Cheng L, Li D, Lai H, Qu J, Loh HH, Fang F, Yang X. Automatic detection of interictal ripples on scalp EEG to evaluate the effect and prognosis of ACTH therapy in patients with infantile spasms. Epilepsia 2021; 62:2240-2251. [PMID: 34309835 DOI: 10.1111/epi.17018] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 07/12/2021] [Accepted: 07/13/2021] [Indexed: 12/22/2022]
Abstract
OBJECTIVE We aimed to explore the feasibility of using scalp-recorded high-frequency oscillations (HFOs) to evaluate the efficacy and prognosis of adrenocorticotropic hormone (ACTH) treatment in patients with infantile spasms. METHODS Thirty-nine children with infantile spasms were enrolled and divided into seizure-free and non-seizure-free groups after ACTH treatment. Patients who were seizure-free were further divided into relapse and non-relapse subgroups based on the observations made during a 6-month follow-up period. Scalp ripples were detected and compared during the interictal periods before and after 2 weeks of treatment. RESULTS After ACTH treatment, the number and channels of ripples were significantly lower, whereas the percentage decrease in the number, spectral power, and channels of ripples was significantly higher in the seizure-free group than in the non-seizure-free group. In addition, the relapse subgroup showed higher number and spectral power and wider distribution of ripples than did the non-relapse subgroup. Changes in HFOs in terms of number, spectral power, and channel of ripples were closely related to the severity of epilepsy and can indicate disease susceptibility. SIGNIFICANCE Scalp HFOs can be used as an effective biomarker to monitor the effect and evaluate the prognosis of ACTH therapy in patients with infantile spasms.
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Affiliation(s)
- Wei Wang
- Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Institute of Brain Disorders, Capital Medical University, Beijing, China.,Bioland Laboratory Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
| | - Hua Li
- Department of Neurology, National Center for Children's Health, Beijing Children's Hospital, Capital Medical University, Beijing, China
| | - Jiaqing Yan
- College of Electrical and Control Engineering, North China University of Technology, Beijing, China
| | - Herui Zhang
- Bioland Laboratory Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
| | - Xiaonan Li
- Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Institute of Brain Disorders, Capital Medical University, Beijing, China.,Bioland Laboratory Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
| | - Su Zheng
- Department of Neurology, National Center for Children's Health, Beijing Children's Hospital, Capital Medical University, Beijing, China
| | - Jiaoyang Wang
- Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Institute of Brain Disorders, Capital Medical University, Beijing, China.,Bioland Laboratory Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
| | - Yue Xing
- Bioland Laboratory Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
| | - Lipeng Cheng
- Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Institute of Brain Disorders, Capital Medical University, Beijing, China.,Bioland Laboratory Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
| | - Donghong Li
- The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Huanling Lai
- Bioland Laboratory Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
| | - Junda Qu
- Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, School of Biomedical Engineering, Capital Medical University, Beijing, China
| | - Horace H Loh
- Bioland Laboratory Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
| | - Fang Fang
- Department of Neurology, National Center for Children's Health, Beijing Children's Hospital, Capital Medical University, Beijing, China
| | - Xiaofeng Yang
- Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Institute of Brain Disorders, Capital Medical University, Beijing, China.,Bioland Laboratory Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China
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7
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Cid E, Marquez-Galera A, Valero M, Gal B, Medeiros DC, Navarron CM, Ballesteros-Esteban L, Reig-Viader R, Morales AV, Fernandez-Lamo I, Gomez-Dominguez D, Sato M, Hayashi Y, Bayés À, Barco A, Lopez-Atalaya JP, de la Prida LM. Sublayer- and cell-type-specific neurodegenerative transcriptional trajectories in hippocampal sclerosis. Cell Rep 2021; 35:109229. [PMID: 34107264 DOI: 10.1016/j.celrep.2021.109229] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 03/18/2021] [Accepted: 05/17/2021] [Indexed: 12/20/2022] Open
Abstract
Hippocampal sclerosis, the major neuropathological hallmark of temporal lobe epilepsy, is characterized by different patterns of neuronal loss. The mechanisms of cell-type-specific vulnerability and their progression and histopathological classification remain controversial. Using single-cell electrophysiology in vivo and immediate-early gene expression, we reveal that superficial CA1 pyramidal neurons are overactive in epileptic rodents. Bulk tissue and single-nucleus expression profiling disclose sublayer-specific transcriptomic signatures and robust microglial pro-inflammatory responses. Transcripts regulating neuronal processes such as voltage channels, synaptic signaling, and cell adhesion are deregulated differently by epilepsy across sublayers, whereas neurodegenerative signatures primarily involve superficial cells. Pseudotime analysis of gene expression in single nuclei and in situ validation reveal separated trajectories from health to epilepsy across cell types and identify a subset of superficial cells undergoing a later stage in neurodegeneration. Our findings indicate that sublayer- and cell-type-specific changes associated with selective CA1 neuronal damage contribute to progression of hippocampal sclerosis.
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Affiliation(s)
- Elena Cid
- Instituto Cajal, CSIC, 28002 Madrid, Spain
| | - Angel Marquez-Galera
- Instituto de Neurociencias, Universidad Miguel Hernández-Consejo Superior de Investigaciones Científicas (UMH-CSIC), 03550 Sant Joan d'Alacant, Alicante, Spain
| | | | - Beatriz Gal
- Instituto Cajal, CSIC, 28002 Madrid, Spain; Universidad Europea de Madrid, 28670 Villaviciosa de Odón, Madrid, Spain
| | | | - Carmen M Navarron
- Instituto de Neurociencias, Universidad Miguel Hernández-Consejo Superior de Investigaciones Científicas (UMH-CSIC), 03550 Sant Joan d'Alacant, Alicante, Spain
| | | | - Rita Reig-Viader
- Institut d'Investigació Biomèdica San Pau, 08041 Barcelona, Spain; Universitat Autònoma de Barcelona, 08193 Bellaterra, Cerdanyola del Vallès, Spain
| | | | | | | | - Masaaki Sato
- RIKEN Brain Science Institute, Wako, 351-0198 Saitama, Japan
| | - Yasunori Hayashi
- RIKEN Brain Science Institute, Wako, 351-0198 Saitama, Japan; Department of Pharmacology, Kyoto University Graduate School of Medicine, 606-8501 Kyoto, Japan
| | - Àlex Bayés
- Institut d'Investigació Biomèdica San Pau, 08041 Barcelona, Spain; Universitat Autònoma de Barcelona, 08193 Bellaterra, Cerdanyola del Vallès, Spain
| | - Angel Barco
- Instituto de Neurociencias, Universidad Miguel Hernández-Consejo Superior de Investigaciones Científicas (UMH-CSIC), 03550 Sant Joan d'Alacant, Alicante, Spain
| | - Jose P Lopez-Atalaya
- Instituto de Neurociencias, Universidad Miguel Hernández-Consejo Superior de Investigaciones Científicas (UMH-CSIC), 03550 Sant Joan d'Alacant, Alicante, Spain.
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Abstract
Abstract
Background
Idiopathic epilepsy (IE) is a common neurological disorder in the domestic dog, and is defined as repeated seizure activity having no identifiable underlying cause. Some breeds, such as the Belgian shepherd dog, have a greater prevalence of the disorder. Previous studies in this and other breeds have identified ADAM23 as a gene that confers risk of IE, although additional loci are known to exist. The present study sought to identify additional loci that influence IE in the Belgian shepherd dog.
Results
Genome-wide association studies (GWAS) revealed a significant association between IE and CFA 14 (p < 1.03 E− 08) and a suggestive association on CFA 37 (p < 2.91 E− 06) in a region in linkage disequilibrium with ADAM23. Logistic regression identified a 2-loci model that demonstrated interaction between the two chromosomal regions that when combined predicted IE risk with high sensitivity.
Conclusions
Two interacting loci, one each on CFAs 14 and 37, predictive of IE in the Belgian shepherd were identified. The loci are adjacent to potential candidate genes associated with neurological function. Further exploration of the region is warranted to identify causal variants underlying the association. Additionally, although the two loci were very good at predicting IE, they failed to capture all the risk, indicating additional loci or incomplete penetrance are also likely contributing to IE expression in the Belgian shepherd dog.
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Duncan D, Vespa P, Pitkänen A, Braimah A, Lapinlampi N, Toga AW. Big data sharing and analysis to advance research in post-traumatic epilepsy. Neurobiol Dis 2019; 123:127-136. [PMID: 29864492 PMCID: PMC6274619 DOI: 10.1016/j.nbd.2018.05.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/24/2018] [Accepted: 05/31/2018] [Indexed: 11/26/2022] Open
Abstract
We describe the infrastructure and functionality for a centralized preclinical and clinical data repository and analytic platform to support importing heterogeneous multi-modal data, automatically and manually linking data across modalities and sites, and searching content. We have developed and applied innovative image and electrophysiology processing methods to identify candidate biomarkers from MRI, EEG, and multi-modal data. Based on heterogeneous biomarkers, we present novel analytic tools designed to study epileptogenesis in animal model and human with the goal of tracking the probability of developing epilepsy over time.
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Affiliation(s)
- Dominique Duncan
- Laboratory of Neuro Imaging, USC Stevens Neuroimaging and Informatics Institute, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA.
| | - Paul Vespa
- Division of Neurosurgery and Department of Neurology, University of California at Los Angeles School of Medicine, Los Angeles, CA, USA
| | - Asla Pitkänen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Adebayo Braimah
- Laboratory of Neuro Imaging, USC Stevens Neuroimaging and Informatics Institute, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
| | - Niina Lapinlampi
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Arthur W Toga
- Laboratory of Neuro Imaging, USC Stevens Neuroimaging and Informatics Institute, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
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10
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Longitudinal assessment of neuronal 3D genomes in mouse prefrontal cortex. Nat Commun 2016; 7:12743. [PMID: 27597321 PMCID: PMC5025847 DOI: 10.1038/ncomms12743] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Accepted: 07/28/2016] [Indexed: 12/15/2022] Open
Abstract
Neuronal epigenomes, including chromosomal loopings moving distal cis-regulatory elements into proximity of target genes, could serve as molecular proxy linking present-day-behaviour to past exposures. However, longitudinal assessment of chromatin state is challenging, because conventional chromosome conformation capture assays essentially provide single snapshots at a given time point, thus reflecting genome organization at the time of brain harvest and therefore are non-informative about the past. Here we introduce 'NeuroDam' to assess epigenome status retrospectively. Short-term expression of the bacterial DNA adenine methyltransferase Dam, tethered to the Gad1 gene promoter in mouse prefrontal cortex neurons, results in stable G(methyl)ATC tags at Gad1-bound chromosomal contacts. We show by NeuroDam that mice with defective cognition 4 months after pharmacological NMDA receptor blockade already were affected by disrupted chromosomal conformations shortly after drug exposure. Retrospective profiling of neuronal epigenomes is likely to illuminate epigenetic determinants of normal and diseased brain development in longitudinal context.
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Dobrowolski SF, Lyons-Weiler J, Spridik K, Vockley J, Skvorak K, Biery A. DNA methylation in the pathophysiology of hyperphenylalaninemia in the PAH(enu2) mouse model of phenylketonuria. Mol Genet Metab 2016; 119:1-7. [PMID: 26822703 PMCID: PMC8958364 DOI: 10.1016/j.ymgme.2016.01.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 12/31/2015] [Accepted: 01/01/2016] [Indexed: 12/25/2022]
Abstract
Phenylalanine hydroxylase deficient phenylketonuria (PKU) is the paradigm for a treatable inborn error of metabolism where maintaining plasma phenylalanine (Phe) in the therapeutic range relates to improved clinical outcomes. While Phe is the presumed intoxicating analyte causal in neurologic damage, the mechanism(s) of Phe toxicity has remained elusive. Altered DNA methylation is a recognized response associated with exposure to numerous small molecule toxic agents. Paralleling this effect, we hypothesized that chronic Phe over-exposure in the brain would lead to aberrant DNA methylation with secondary influence upon gene regulation that would ultimately contribute to PKU neuropathology. The PAH(enu2) mouse models human PKU with intrinsic hyperphenylalaninemia, abnormal response to Phe challenge, and neurologic deficit. To examine this hypothesis, we assessed DNA methylation patterns in brain tissues using methylated DNA immunoprecipitation and paired end sequencing in adult PAH(enu2) animals maintained under either continuous dietary Phe restriction or chronic hyperphenylalaninemia. Heterozygous PAH(enu2/WT) litter mates served as controls for normal Phe exposure. Extensive repatterning of DNA methylation was observed in brain tissue of hyperphenylalaninemic animals while Phe restricted animals displayed an attenuated pattern of aberrant DNA methylation. Affected gene coding regions displayed aberrant hypermethylation and hypomethylation. Gene body methylation of noncoding RNA genes was observed and among these microRNA genes were prominent. Of particular note, observed only in hyperphenylalaninemic animals, was hypomethylation of miRNA genes within the imprinted Dlk1-Dio3 locus on chromosome 12. Aberrant methylation of microRNA genes influenced their expression which has secondary effects upon the expression of targeted protein coding genes. Differential hypermethylation of gene promoters was exclusive to hyperphenylalaninemic PAH(enu2) animals. Genes with synaptic involvement were targets of promoter hypermethylation that resulted in down-regulation of their expression. Gene dysregulation secondary to abnormal DNA methylation may be contributing to PKU neuropathology. These results suggest drugs that prevent or correct aberrant DNA methylation may offer a novel therapeutic option to management of neurological symptoms in PKU patients.
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Affiliation(s)
- S F Dobrowolski
- Department of Pathology, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States.
| | - J Lyons-Weiler
- Genomics and Proteomics Core Laboratories, University of Pittsburgh, 3343 Forbes Avenue, Pittsburgh, PA 15260, United States
| | - K Spridik
- Department of Pathology, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States
| | - J Vockley
- Department of Pediatrics, University of Pittsburgh School of Medicine, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States; Department of Human Genetics, University of Pittsburgh Graduate School of Public Health, 4401 Penn Avenue, Pittsburgh, PA 15224, United States
| | - K Skvorak
- Department of Pediatrics, University of Pittsburgh School of Medicine, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States; Department of Human Genetics, University of Pittsburgh Graduate School of Public Health, 4401 Penn Avenue, Pittsburgh, PA 15224, United States
| | - A Biery
- Department of Pathology, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States
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Bocksteins E. Kv5, Kv6, Kv8, and Kv9 subunits: No simple silent bystanders. J Gen Physiol 2016; 147:105-25. [PMID: 26755771 PMCID: PMC4727947 DOI: 10.1085/jgp.201511507] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 12/11/2015] [Indexed: 12/19/2022] Open
Abstract
Members of the electrically silent voltage-gated K(+) (Kv) subfamilies (Kv5, Kv6, Kv8, and Kv9, collectively identified as electrically silent voltage-gated K(+) channel [KvS] subunits) do not form functional homotetrameric channels but assemble with Kv2 subunits into heterotetrameric Kv2/KvS channels with unique biophysical properties. Unlike the ubiquitously expressed Kv2 subunits, KvS subunits show a more restricted expression. This raises the possibility that Kv2/KvS heterotetramers have tissue-specific functions, making them potential targets for the development of novel therapeutic strategies. Here, I provide an overview of the expression of KvS subunits in different tissues and discuss their proposed role in various physiological and pathophysiological processes. This overview demonstrates the importance of KvS subunits and Kv2/KvS heterotetramers in vivo and the importance of considering KvS subunits and Kv2/KvS heterotetramers in the development of novel treatments.
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Affiliation(s)
- Elke Bocksteins
- Laboratory for Molecular Biophysics, Physiology, and Pharmacology, Department for Biomedical Sciences, University of Antwerp, 2610 Antwerp, Belgium
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13
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Griffin NG, Wang Y, Hulette CM, Halvorsen M, Cronin KD, Walley NM, Haglund MM, Radtke RA, Skene JHP, Sinha SR, Heinzen EL. Differential gene expression in dentate granule cells in mesial temporal lobe epilepsy with and without hippocampal sclerosis. Epilepsia 2016; 57:376-85. [PMID: 26799155 DOI: 10.1111/epi.13305] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/02/2015] [Indexed: 02/01/2023]
Abstract
OBJECTIVE Hippocampal sclerosis is the most common neuropathologic finding in cases of medically intractable mesial temporal lobe epilepsy. In this study, we analyzed the gene expression profiles of dentate granule cells of patients with mesial temporal lobe epilepsy with and without hippocampal sclerosis to show that next-generation sequencing methods can produce interpretable genomic data from RNA collected from small homogenous cell populations, and to shed light on the transcriptional changes associated with hippocampal sclerosis. METHODS RNA was extracted, and complementary DNA (cDNA) was prepared and amplified from dentate granule cells that had been harvested by laser capture microdissection from surgically resected hippocampi from patients with mesial temporal lobe epilepsy with and without hippocampal sclerosis. Sequencing libraries were sequenced, and the resulting sequencing reads were aligned to the reference genome. Differential expression analysis was used to ascertain expression differences between patients with and without hippocampal sclerosis. RESULTS Greater than 90% of the RNA-Seq reads aligned to the reference. There was high concordance between transcriptional profiles obtained for duplicate samples. Principal component analysis revealed that the presence or absence of hippocampal sclerosis was the main determinant of the variance within the data. Among the genes up-regulated in the hippocampal sclerosis samples, there was significant enrichment for genes involved in oxidative phosphorylation. SIGNIFICANCE By analyzing the gene expression profiles of dentate granule cells from surgically resected hippocampal specimens from patients with mesial temporal lobe epilepsy with and without hippocampal sclerosis, we have demonstrated the utility of next-generation sequencing methods for producing biologically relevant results from small populations of homogeneous cells, and have provided insight on the transcriptional changes associated with this pathology.
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Affiliation(s)
- Nicole G Griffin
- Institute for Genomic Medicine, Columbia University, New York, New York, U.S.A
| | - Yu Wang
- Department of Neurobiology, Duke University School of Medicine, Durham, North Carolina, U.S.A
| | - Christine M Hulette
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina, U.S.A
| | - Matt Halvorsen
- Institute for Genomic Medicine, Columbia University, New York, New York, U.S.A
| | - Kenneth D Cronin
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, U.S.A
| | - Nicole M Walley
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina, U.S.A
| | - Michael M Haglund
- Department of Neurosurgery, Duke University School of Medicine, Durham, North Carolina, U.S.A
| | - Rodney A Radtke
- Department of Neurology, Duke University School of Medicine, Durham, North Carolina, U.S.A
| | - J H Pate Skene
- Department of Neurobiology, Duke University School of Medicine, Durham, North Carolina, U.S.A
| | - Saurabh R Sinha
- Department of Neurology, Duke University School of Medicine, Durham, North Carolina, U.S.A
| | - Erin L Heinzen
- Institute for Genomic Medicine, Columbia University, New York, New York, U.S.A.,Department of Pathology and Cell Biology, Columbia University, New York, New York, U.S.A
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