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Xiong GJ, Sheng ZH. Presynaptic perspective: Axonal transport defects in neurodevelopmental disorders. J Cell Biol 2024; 223:e202401145. [PMID: 38568173 PMCID: PMC10988239 DOI: 10.1083/jcb.202401145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Revised: 03/20/2024] [Accepted: 03/21/2024] [Indexed: 04/05/2024] Open
Abstract
Disruption of synapse assembly and maturation leads to a broad spectrum of neurodevelopmental disorders. Presynaptic proteins are largely synthesized in the soma, where they are packaged into precursor vesicles and transported into distal axons to ensure precise assembly and maintenance of presynapses. Due to their morphological features, neurons face challenges in the delivery of presynaptic cargos to nascent boutons. Thus, targeted axonal transport is vital to build functional synapses. A growing number of mutations in genes encoding the transport machinery have been linked to neurodevelopmental disorders. Emerging lines of evidence have started to uncover presynaptic mechanisms underlying axonal transport defects, thus broadening the view of neurodevelopmental disorders beyond postsynaptic mechanisms. In this review, we discuss presynaptic perspectives of neurodevelopmental disorders by focusing on impaired axonal transport and disturbed assembly and maintenance of presynapses. We also discuss potential strategies for restoring axonal transport as an early therapeutic intervention.
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Affiliation(s)
- Gui-Jing Xiong
- Synaptic Function Section, The Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Zu-Hang Sheng
- Synaptic Function Section, The Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
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2
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Wei H, Yuan Y, Zhu C, Ma M, Yang F, Lu Z, Wang C, Deng H, Zhao J, Tian R, Zhu W, Shen Y, Yu X, Xu Q. DNA Hyper-methylation Associated With Schizophrenia May Lead to Increased Levels of Autoantibodies. SCHIZOPHRENIA BULLETIN OPEN 2024; 5:sgac047. [PMID: 39144109 PMCID: PMC11207751 DOI: 10.1093/schizbullopen/sgac047] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
Background and Hypothesis Environmental stressors may influence immune surveillance in B lymphocytes and stimulate autoimmune responses via epigenetic DNA methylation modifications in schizophrenia (SCZ). Study Design A total of 2722, Chinese Han origin subjects were recruited in this study (2005-2011), which included a discovery follow-up cohort with 40 remitters of SCZ (RSCZ), 40 nonremitters of SCZ (NRSCZ), and 40 controls (CTL), and a replication follow-up cohort (64 RSCZ, 16 NRSCZ, and 84 CTL), as well as a case-control validation cohort (1230 SCZ and 1208 CTL). Genomic DNA methylation, target gene mRNA transcripts, and plasma autoantibody levels were measured across cohorts. Study Results We found extensive differences in global DNA methylation profiles between RSCZ and NRSCZ groups, wherein differential methylation sites (DMS) were enriched with immune cell maturation and activation in the RSCZ group. Out of 2722 participants, the foremost DMS cg14341177 was hyper-methylated in the SCZ group and it inhibited the alternative splicing of its target gene BICD2 and may have increased its autoantigen exposure, leading to an increase in plasma anti-BICD2 IgG antibody levels. The levels of cg14341177 methylation and anti-BICD2 IgG decreased significantly in RSCZ endpoint samples but not in NRSCZ endpoint samples. There are strong positive correlations between cg14341177 methylation, anti-BICD2 IgG, and positive and negative syndrome scale (PANSS) scores in the RSCZ groups, but not in the NRSCZ groups. Conclusions These data suggest that abnormal DNA methylation could affect autoreactive responses in SCZ, and that cg14341177 methylation and anti-BICD2 IgG levels may potentially serve as useful biomarkers.
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Affiliation(s)
- Hui Wei
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China
- Neuroscience Center, Chinese Academy of Medical Sciences, Beijing, China
| | - Yanbo Yuan
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China
| | - Caiyun Zhu
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China
- Neuroscience Center, Chinese Academy of Medical Sciences, Beijing, China
| | - Mingjie Ma
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China
- Neuroscience Center, Chinese Academy of Medical Sciences, Beijing, China
| | - Fude Yang
- Beijing Hui-Long-Guan Hospital, Beijing, China
| | - Zheng Lu
- Shanghai Mental Health Center, Shanghai, China
| | | | - Hong Deng
- Mental Health Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Jingping Zhao
- Mental Health Institute, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Runhui Tian
- Mental Health Center, The First Bethune Hospital of Jilin University, Changchun, Jilin, China
| | - Wanwan Zhu
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China
- Neuroscience Center, Chinese Academy of Medical Sciences, Beijing, China
| | - Yan Shen
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China
| | - Xin Yu
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China
| | - Qi Xu
- State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China
- Neuroscience Center, Chinese Academy of Medical Sciences, Beijing, China
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3
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Gibson JM, Zhao X, Ali MY, Solmaz SR, Wang C. A Structural Model for the Core Nup358-BicD2 Interface. Biomolecules 2023; 13:1445. [PMID: 37892127 PMCID: PMC10604712 DOI: 10.3390/biom13101445] [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: 08/04/2023] [Revised: 09/08/2023] [Accepted: 09/19/2023] [Indexed: 10/29/2023] Open
Abstract
Dynein motors facilitate the majority of minus-end-directed transport events on microtubules. The dynein adaptor Bicaudal D2 (BicD2) recruits the dynein machinery to several cellular cargo for transport, including Nup358, which facilitates a nuclear positioning pathway that is essential for the differentiation of distinct brain progenitor cells. Previously, we showed that Nup358 forms a "cargo recognition α-helix" upon binding to BicD2; however, the specifics of the BicD2-Nup358 interface are still not well understood. Here, we used AlphaFold2, complemented by two additional docking programs (HADDOCK and ClusPro) as well as mutagenesis, to show that the Nup358 cargo-recognition α-helix binds to BicD2 between residues 747 and 774 in an anti-parallel manner, forming a helical bundle. We identified two intermolecular salt bridges that are important to stabilize the interface. In addition, we uncovered a secondary interface mediated by an intrinsically disordered region of Nup358 that is directly N-terminal to the cargo-recognition α-helix and binds to BicD2 between residues 774 and 800. This is the same BicD2 domain that binds to the competing cargo adapter Rab6, which is important for the transport of Golgi-derived and secretory vesicles. Our results establish a structural basis for cargo recognition and selection by the dynein adapter BicD2, which facilitates transport pathways that are important for brain development.
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Affiliation(s)
- James M. Gibson
- Department of Biological Sciences, Department of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA
| | - Xiaoxin Zhao
- Department of Chemistry, Binghamton University, P.O. Box 6000, Binghamton, NY 13902, USA;
| | - M. Yusuf Ali
- Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, VT 05405, USA;
| | - Sozanne R. Solmaz
- Department of Chemistry, Binghamton University, P.O. Box 6000, Binghamton, NY 13902, USA;
| | - Chunyu Wang
- Department of Biological Sciences, Department of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA
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4
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Hirsch Y, Chung WK, Novoselov S, Weimer LH, Rossor A, LeDuc CA, McPartland AJ, Cabrera E, Ekstein J, Scher S, Nelson RF, Schiavo G, Henderson LB, Booth KTA. Biallelic Loss-of-Function Variants in BICD1 Are Associated with Peripheral Neuropathy and Hearing Loss. Int J Mol Sci 2023; 24:8897. [PMID: 37240244 PMCID: PMC10219021 DOI: 10.3390/ijms24108897] [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: 03/27/2023] [Revised: 05/16/2023] [Accepted: 05/16/2023] [Indexed: 05/28/2023] Open
Abstract
Hearing loss and peripheral neuropathy are two clinical entities that are genetically and phenotypically heterogeneous and sometimes co-occurring. Using exome sequencing and targeted segregation analysis, we investigated the genetic etiology of peripheral neuropathy and hearing loss in a large Ashkenazi Jewish family. Moreover, we assessed the production of the candidate protein via western blotting of lysates from fibroblasts from an affected individual and an unaffected control. Pathogenic variants in known disease genes associated with hearing loss and peripheral neuropathy were excluded. A homozygous frameshift variant in the BICD1 gene, c.1683dup (p.(Arg562Thrfs*18)), was identified in the proband and segregated with hearing loss and peripheral neuropathy in the family. The BIDC1 RNA analysis from patient fibroblasts showed a modest reduction in gene transcripts compared to the controls. In contrast, protein could not be detected in fibroblasts from a homozygous c.1683dup individual, whereas BICD1 was detected in an unaffected individual. Our findings indicate that bi-allelic loss-of-function variants in BICD1 are associated with hearing loss and peripheral neuropathy. Definitive evidence that bi-allelic loss-of-function variants in BICD1 cause peripheral neuropathy and hearing loss will require the identification of other families and individuals with similar variants with the same phenotype.
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Affiliation(s)
- Yoel Hirsch
- Dor Yeshorim, Committee for Prevention Jewish Genetic Diseases, Brooklyn, NY 11211, USA
| | - Wendy K. Chung
- Departments of Pediatrics and Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Sergey Novoselov
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Louis H. Weimer
- Department of Neurology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Alexander Rossor
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Charles A. LeDuc
- Departments of Pediatrics and Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Amanda J. McPartland
- Departments of Pediatrics and Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Ernesto Cabrera
- Department of Otolaryngology-Head and Neck Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Josef Ekstein
- Dor Yeshorim, Committee for Prevention Jewish Genetic Diseases, Brooklyn, NY 11211, USA
| | - Sholem Scher
- Dor Yeshorim, Committee for Prevention Jewish Genetic Diseases, Brooklyn, NY 11211, USA
| | - Rick F. Nelson
- Department of Otolaryngology-Head and Neck Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Giampietro Schiavo
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK
- UK Dementia Research Institute at UCL, London WC1E 6BT, UK
| | | | - Kevin T. A. Booth
- Department of Otolaryngology-Head and Neck Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Medical and Molecular Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA
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5
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Unger A, Roos A, Gangfuß A, Hentschel A, Gläser D, Krause K, Doering K, Schara-Schmidt U, Hoffjan S, Vorgerd M, Güttsches AK. Microscopic and Biochemical Hallmarks of BICD2-Associated Muscle Pathology toward the Evaluation of Novel Variants. Int J Mol Sci 2023; 24:ijms24076808. [PMID: 37047781 PMCID: PMC10095373 DOI: 10.3390/ijms24076808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 04/02/2023] [Accepted: 04/03/2023] [Indexed: 04/08/2023] Open
Abstract
BICD2 variants have been linked to neurodegenerative disorders like spinal muscular atrophy with lower extremity predominance (SMALED2) or hereditary spastic paraplegia (HSP). Recently, mutations in BICD2 were implicated in myopathies. Here, we present one patient with a known and six patients with novel BICD2 missense variants, further characterizing the molecular landscape of this heterogenous neurological disorder. A total of seven patients were genotyped and phenotyped. Skeletal muscle biopsies were analyzed by histology, electron microscopy, and protein profiling to define pathological hallmarks and pathogenicity markers with consecutive validation using fluorescence microscopy. Clinical and MRI-features revealed a typical pattern of distal paresis of the lower extremities as characteristic features of a BICD2-associated disorder. Histological evaluation showed myopathic features of varying severity including fiber size variation, lipofibromatosis, and fiber splittings. Proteomic analysis with subsequent fluorescence analysis revealed an altered abundance and localization of thrombospondin-4 and biglycan. Our combined clinical, histopathological, and proteomic approaches provide new insights into the pathophysiology of BICD2-associated disorders, confirming a primary muscle cell vulnerability. In this context, biglycan and thrombospondin-4 have been identified, may serve as tissue pathogenicity markers, and might be linked to perturbed protein secretion based on an impaired vesicular transportation.
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Affiliation(s)
- Andreas Unger
- Department of Cardiovascular Medicine, Institute for Genetics of Heart Disease (IfGH), University Hospital Münster, 48149 Münster, Germany
- Institute of Physiology II, University of Münster, 48149 Münster, Germany
| | - Andreas Roos
- Department of Neurology, Heimer Institute for Muscle Research, University Hospital Bergmannsheil, Ruhr University Bochum, 44789 Bochum, Germany
- Department of Pediatric Neurology, Centre for Neuromuscular Disorders, Centre for Translational Neuro- and Behavioral Sciences, University Duisburg-Essen, 45122 Essen, Germany
- Children’s Hospital of Eastern Ontario Research Institute, Ottawa, ON K1H 8L1, Canada
| | - Andrea Gangfuß
- Children’s Hospital of Eastern Ontario Research Institute, Ottawa, ON K1H 8L1, Canada
| | - Andreas Hentschel
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., 44139 Dortmund, Germany
| | - Dieter Gläser
- Genetikum, Center for Human Genetics, 89231 Neu-Ulm, Germany
| | - Karsten Krause
- Department of Neurology, Heimer Institute for Muscle Research, University Hospital Bergmannsheil, Ruhr University Bochum, 44789 Bochum, Germany
| | - Kristina Doering
- Department of Human Genetics, Ruhr-University Bochum, 44801 Bochum, Germany
| | - Ulrike Schara-Schmidt
- Department of Pediatric Neurology, Centre for Neuromuscular Disorders, Centre for Translational Neuro- and Behavioral Sciences, University Duisburg-Essen, 45122 Essen, Germany
| | - Sabine Hoffjan
- Department of Human Genetics, Ruhr-University Bochum, 44801 Bochum, Germany
| | - Matthias Vorgerd
- Department of Neurology, Heimer Institute for Muscle Research, University Hospital Bergmannsheil, Ruhr University Bochum, 44789 Bochum, Germany
| | - Anne-Katrin Güttsches
- Department of Neurology, Heimer Institute for Muscle Research, University Hospital Bergmannsheil, Ruhr University Bochum, 44789 Bochum, Germany
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6
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Yi J, Zhao X, Noell CR, Helmer P, Solmaz SR, Vallee RB. Role of Nesprin-2 and RanBP2 in BICD2-associated brain developmental disorders. PLoS Genet 2023; 19:e1010642. [PMID: 36930595 PMCID: PMC10022797 DOI: 10.1371/journal.pgen.1010642] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 01/28/2023] [Indexed: 03/18/2023] Open
Abstract
Bicaudal D2 (BICD2) is responsible for recruiting cytoplasmic dynein to diverse forms of subcellular cargo for their intracellular transport. Mutations in the human BICD2 gene have been found to cause an autosomal dominant form of spinal muscular atrophy (SMA-LED2), and brain developmental defects. Whether and how the latter mutations are related to roles we and others have identified for BICD2 in brain development remains little understood. BICD2 interacts with the nucleoporin RanBP2 to recruit dynein to the nuclear envelope (NE) of Radial Glial Progenitor cells (RGPs) to mediate their well-known but mysterious cell-cycle-regulated interkinetic nuclear migration (INM) behavior, and their subsequent differentiation to form cortical neurons. We more recently found that BICD2 also mediates NE dynein recruitment in migrating post-mitotic neurons, though via a different interactor, Nesprin-2. Here, we report that Nesprin-2 and RanBP2 compete for BICD2-binding in vitro. To test the physiological implications of this behavior, we examined the effects of known BICD2 mutations using in vitro biochemical and in vivo electroporation-mediated brain developmental assays. We find a clear relationship between the ability of BICD2 to bind RanBP2 vs. Nesprin-2 in controlling of nuclear migration and neuronal migration behavior. We propose that mutually exclusive RanBP2-BICD2 vs. Nesprin-2-BICD2 interactions at the NE play successive, critical roles in INM behavior in RGPs and in post-mitotic neuronal migration and errors in these processes contribute to specific human brain malformations.
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Affiliation(s)
- Julie Yi
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York, United States of America
| | - Xiaoxin Zhao
- Department of Chemistry, Binghamton University, Binghamton, New York, New York, United States of America
| | - Crystal R. Noell
- Department of Chemistry, Binghamton University, Binghamton, New York, New York, United States of America
| | - Paige Helmer
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York, United States of America
| | - Sozanne R. Solmaz
- Department of Chemistry, Binghamton University, Binghamton, New York, New York, United States of America
| | - Richard B. Vallee
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York, United States of America
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7
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Matsui S, Iwatani S, Morisada N, Takenouchi T, Yoshimoto S. Vocal cord paralysis in autosomal dominant spinal muscular atrophy due to BICD2. Congenit Anom (Kyoto) 2023; 63:52-53. [PMID: 36517450 DOI: 10.1111/cga.12500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 10/23/2022] [Accepted: 11/16/2022] [Indexed: 12/23/2022]
Affiliation(s)
- Sachiko Matsui
- Department of Neonatology, Hyogo Prefectural Kobe Children's Hospital, Kobe, Hyogo, Japan
| | - Sota Iwatani
- Department of Neonatology, Hyogo Prefectural Kobe Children's Hospital, Kobe, Hyogo, Japan
| | - Naoya Morisada
- Department of Clinical Genetics, Hyogo Prefectural Kobe Children's Hospital, Kobe, Hyogo, Japan
| | - Toshiki Takenouchi
- Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan
| | - Seiji Yoshimoto
- Department of Neonatology, Hyogo Prefectural Kobe Children's Hospital, Kobe, Hyogo, Japan
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8
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In vitro characterization of the full-length human dynein-1 cargo adaptor BicD2. Structure 2022; 30:1470-1478.e3. [PMID: 36150379 DOI: 10.1016/j.str.2022.08.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 07/07/2022] [Accepted: 08/29/2022] [Indexed: 11/22/2022]
Abstract
Cargo adaptors are crucial in coupling motor proteins with their respective cargos and regulatory proteins. BicD2 is a prominent example within the cargo adaptor family. BicD2 is able to recruit the microtubule motor dynein to RNA, viral particles, and nuclei. The BicD2-mediated interaction between the nucleus and dynein is implicated in mitosis, interkinetic nuclear migration (INM) in radial glial progenitor cells, and neuron precursor migration during embryonic neocortex development. In vitro studies involving full-length cargo adaptors are difficult to perform due to the hydrophobic character, low-expression levels, and intrinsic flexibility of cargo adaptors. Here, we report the recombinant production of full-length human BicD2 and confirm its biochemical activity by interaction studies with RanBP2. We also describe pH-dependent conformational changes of BicD2 using cryoelectron microscopy (cryo-EM), template-free structure predictions, and biophysical tools. Our results will help define the biochemical parameters for the in vitro reconstitution of higher-order BicD2 protein complexes.
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9
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Luo K, Zheng C, Luo R, Cao X, Sun H, Ma H, Huang J, Yang X, Wu X, Li X. Identification and functional characterization of BICD2 as a candidate disease gene in an consanguineous family with dilated cardiomyopathy. BMC Med Genomics 2022; 15:189. [PMID: 36068540 PMCID: PMC9446846 DOI: 10.1186/s12920-022-01349-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 08/23/2022] [Indexed: 11/26/2022] Open
Abstract
Background Familial dilated cardiomyopathy (DCM) is a genetic cardiomyopathy that is associated with reduced left ventricle function or systolic function. Fifty-one DCM-causative genes have been reported, most of which are inherited in an autosomal dominant manner. However, recessive DCM-causative gene is rarely observed. Methods Whole-exome sequencing (WES) was performed in a consanguineous family with DCM to identify candidate variants. Sanger sequencing was utilized to confirm the variant. We then checked the DCM candidate gene in 210 sporadic DCM cases. We next explored BICD2 function in both embryonic and adult bicd2-knockout zebrafish models. In vivo cardiac function of bicd2-knockout fish was detected by echocardiography and RNA-seq. Results We identified an autosomal recessive and evolutionarily conserved missense variant, NM_001003800.1:c.2429G > A, in BICD2, which segregated with the disease phenotype in a consanguineous family with DCM. Furthermore, we confirmed the presence of BICD2 variants in 3 sporadic cases. Knockout of bicd2 resulted in partial embryonic lethality in homozygotes, suggesting a vital role for bicd2 in embryogenesis. Heart dilation and decreased ejection fraction, cardiac output and stroke volume were observed in bicd2-knockout zebrafish, suggesting a phenotype similar to human DCM. Furthermore, RNA-seq confirmed a larger transcriptome shift in in bicd2 homozygotes than in heterozygotes. Gene set enrichment analysis of bicd2-deficient fish showed the enrichment of altered gene expression in cardiac pathways and mitochondrial energy metabolism. Conclusions Our study first shows that BICD2 is a novel candidate gene associated with familial DCM, and our findings will facilitate further insights into the molecular pathological mechanisms of DCM. Supplementary Information The online version contains supplementary material available at 10.1186/s12920-022-01349-y.
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Affiliation(s)
- Kai Luo
- Department of Cardiology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, Sichuan, People's Republic of China.,Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, Chengdu, 610072, People's Republic of China
| | - Chenqing Zheng
- Shenzhen Aone Medical Laboratory Co., Ltd., Shenzhen, People's Republic of China
| | - Rong Luo
- Institute of Geriatric Cardiovascular Disease, Chengdu Medical College, Chengdu, People's Republic of China
| | - Xin Cao
- School of Acupuncture-Moxibustion and Tuina, Chengdu University of Traditional Chinese Medicine, Chengdu, People's Republic of China
| | - Huajun Sun
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, Chengdu, 610072, People's Republic of China.,Department of Pathology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, Sichuan, People's Republic of China
| | - Huihui Ma
- Department of Cardiology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, Sichuan, People's Republic of China.,Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, Chengdu, 610072, People's Republic of China
| | - Jichang Huang
- Institute of Geriatric Cardiovascular Disease, Chengdu Medical College, Chengdu, People's Republic of China
| | - Xu Yang
- Shenzhen Aone Medical Laboratory Co., Ltd., Shenzhen, People's Republic of China
| | - Xiushan Wu
- The Center for Heart Development, Hunan Normal University, Changsha, People's Republic of China. .,Guangdong Provincial Key Laboratory of Pathogenesis, Targeted Prevention and Treatment of Heart Disease, Guangzhou, Guangdong, People's Republic of China.
| | - Xiaoping Li
- Department of Cardiology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, Sichuan, People's Republic of China. .,Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, Chengdu, 610072, People's Republic of China.
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10
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Yamamoto K, Ohashi K, Fujimoto M, Ieda D, Nakamura Y, Hattori A, Kaname T, Ieda K, Nishino I, Saitoh S. Long-term follow-up of a patient with autosomal dominant lower extremity-predominant spinal muscular atrophy-2 due to a BICD2 variant. Brain Dev 2022; 44:578-582. [PMID: 35527075 DOI: 10.1016/j.braindev.2022.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 04/03/2022] [Accepted: 04/14/2022] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Bicaudal D homolog 2 (BICD2) is a causative gene of autosomal-dominant lower extremity-predominant spinal muscular atrophy-2 (SMA-LED2). The severity of SMA-LED2 varies widely, ranging from cases in which patients are able to walk to cases in which severe joint contractures lead to respiratory failure. In this study, we report the long-term course of a case of SMA-LED2 in comparison with previous reports. CASE REPORT The patient was a 19-year-old woman. She had knee and hip dislocations with contractures, femoral fracture, and talipes calcaneovalgus since birth, and was diagnosed with arthrogryposis multiplex congenita. Intense respiratory support was not needed during the neonatal period. She had aspiration pneumonia repeatedly, necessitating NICU admission until 8 months of age. She achieved head control at 9 months of age and was able to sit at 2 years of age; however, she could not walk. Tube feeding was required until 3 years of age. At present, she can eat orally, move around with a wheelchair, and write words by herself. She needs non-invasive positive pressure ventilation during sleep because of a restrictive respiratory disorder during adolescence. Exome analysis identified a de novo heterozygous missense variant (c.2320G>A; p.Glu774Lys) in BICD2. CONCLUSION Patients with SMA-LED2 may have a relatively better prognosis in terms of social activities in comparison with the dysfunction in the neonatal period. Moreover, it is important to periodically evaluate respiratory function in patients with SMA-LED2 because respiratory dysfunction may occur during adolescence.
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Affiliation(s)
- Kosuke Yamamoto
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan; Department of Pediatrics, Gifu Prefectural Tajimi Hospital, Gifu, Japan
| | - Kei Ohashi
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Masanori Fujimoto
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Daisuke Ieda
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Yuji Nakamura
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Ayako Hattori
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan.
| | - Tadashi Kaname
- Department of Genome Medicine, National Center for Child Health and Development, Tokyo, Japan
| | - Kuniko Ieda
- Department of Pediatrics, Tosei General Hospital, Aichi, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Shinji Saitoh
- Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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11
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Caglayan AO, Tuysuz B, Gül E, Alkaya DU, Yalcinkaya C, Gleeson JG, Bilguvar K, Gunel M. Biallelic BICD2 variant is a novel candidate for Cohen-like syndrome. J Hum Genet 2022; 67:553-556. [PMID: 35338243 PMCID: PMC9420744 DOI: 10.1038/s10038-022-01032-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 02/19/2022] [Accepted: 03/07/2022] [Indexed: 11/21/2022]
Abstract
Heterozygous mutations in Bicaudal D2 Drosophila homolog 2 (BICD2) gene, encodes a vesicle transport protein involved in dynein-mediated movement along microtubules, are responsible for an exceedingly rare autosomal dominant spinal muscular atrophy type 2A which starts in the childhood and predominantly effects lower extremities. Recently, a more severe form, type 2B, has also been described. Here, we present a patient born to a consanguineous union and who suffered from intellectual disability, speech delay, epilepsy, happy facial expression, truncal obesity with tappering fingers, and joint hypermobility. Whole-exome sequencing analysis revealed a rare, homozygous missense mutation (c.731T>C; p.Leu244Pro) in BICD2 gene. This finding presents the first report in the literature for homozygous BICD2 mutations and its association with a Cohen-Like syndrome. Patients presenting with Cohen-Like phenotypes should be further interrogated for mutations in BICD2.
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Affiliation(s)
- Ahmet Okay Caglayan
- Departments of Neurosurgery, Neurobiology and Genetics, Yale School of Medicine, New Haven, CT, 06520-8082, USA.
| | - Beyhan Tuysuz
- Department of Pediatrics, Division of Pediatric Genetics, Cerrahpasa Medical School, Istanbul University-Cerrahpasa, Istanbul, Turkey.
| | - Ece Gül
- Department of Pediatrics, Division of Pediatric Genetics, Cerrahpasa Medical School, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Dilek Uludag Alkaya
- Department of Pediatrics, Division of Pediatric Genetics, Cerrahpasa Medical School, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Cengiz Yalcinkaya
- Department of Neurology, Cerrahpasa Medical School, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Joseph G Gleeson
- Department of Neurosciences, Howard Hughes Medical Institute, University of California, San Diego, La Jolla, CA, 92093, USA
- Rady Children's Institute for Genomic Medicine, San Diego, CA, 92025, USA
| | - Kaya Bilguvar
- Departments of Neurosurgery, Neurobiology and Genetics, Yale School of Medicine, New Haven, CT, 06520-8082, USA
- Yale Center for Genome Analysis, Yale School of Medicine, New Haven, CT, 06510, USA
| | - Murat Gunel
- Departments of Neurosurgery, Neurobiology and Genetics, Yale School of Medicine, New Haven, CT, 06520-8082, USA
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12
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Oliwa A, Joseph S, Millar E, Horrocks I, Penman D, Baptista J, Cullup T, Constantinou P, Heuchan AM, Hamilton R, Longman C. Cataract, abnormal electroretinogram and visual evoked potentials in a child with SMA-LED2 - extending the phenotype. J Neuromuscul Dis 2022; 9:803-808. [PMID: 36057830 DOI: 10.3233/jnd-220818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This case report describes a girl who presented antenatal arthrogryposis and postnatal hypotonia, generalized and respiratory weakness, joint deformities particularly affecting the lower limbs and poor swallow. By 5 months, cataracts, abnormal electroretinograms, visual evoked potentials and global developmental impairments were recognized. No causative variants were identified on targeted gene panels. After her unexpected death at 11 months, gene-agnostic trio whole exome sequencing revealed a likely pathogenic de novo BICD2 missense variant, NM_001003800.1, c.593T>C, p.(Leu198Pro), confirming the diagnosis of spinal muscular atrophy lower extremity predominant type 2 (SMA-LED2). We propose that cataracts and abnormal electroretinograms are novel features of SMA-LED2.
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Affiliation(s)
- Agata Oliwa
- Undergraduate Medical School, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Shuko Joseph
- Fraser of Allander Neurosciences Unit, Royal Hospital for Children, Glasgow, UK
| | - Eoghan Millar
- Department of Ophthalmology, Royal Hospital for Children, Glasgow, UK
| | - Iain Horrocks
- Fraser of Allander Neurosciences Unit, Royal Hospital for Children, Glasgow, UK
| | - Dawn Penman
- Department of Pathology, Queen Elizabeth University Hospital, Glasgow, UK
| | - Julia Baptista
- Peninsula Medical School, Faculty of Heath, University of Plymouth, Plymouth, UK
| | - Thomas Cullup
- North Thames Genomic Laboratory Hub, Great Ormond Street Hospital NHS Foundation Trust, London, UK
| | - Panayiotis Constantinou
- West of Scotland Regional Genetics Service, Queen Elizabeth University Hospital, Glasgow, UK
| | | | - Ruth Hamilton
- Department of Clinical Physics and Bioengineering, Royal Hospital for Children, NHS Greater Glasgow & Clyde, Glasgow, UK
| | - Cheryl Longman
- West of Scotland Regional Genetics Service, Queen Elizabeth University Hospital, Glasgow, UK
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13
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Li JT, Dong SQ, Zhu DQ, Yang WB, Qian T, Liu XN, Chen XJ. Expanding the Phenotypic and Genetic Spectrum of Neuromuscular Diseases Caused by DYNC1H1 Mutations. Front Neurol 2022; 13:943324. [PMID: 35899263 PMCID: PMC9309508 DOI: 10.3389/fneur.2022.943324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 06/14/2022] [Indexed: 11/25/2022] Open
Abstract
Objectives Spinal muscular atrophy with lower extremity predominance 1 (SMALED1) and Charcot–Marie-Tooth diseasetype 2O (CMT2O) are two kinds of hereditary neuromuscular diseases caused by DYNC1H1 mutations. In this study, we reported two patients with SMALED1 caused by DYNC1H1 mutations. The genotype–phenotype correlations were further analyzed by systematically reviewing previous relevant publications. Materials and Methods Two patients' with SMALED1 and their parents' clinical data were collected, and detailed clinical examinations were performed. WES was then applied, which was confirmed by Sanger sequencing. PubMed, Web of Science, CNKI, and Wanfang Data were searched, and all publications that met the inclusion criteria were carefully screened. Any individual patient without a detailed description of clinical phenotypes was excluded. Results The two patients manifested delayed motor milestones and muscle wasting of both lower extremities. The diagnosis was further confirmed as SMALED1. Genetic testing revealed heterozygous DYNC1H1 mutations c.1792C>T and c.790C>G; the latter is a novel dominant mutation. Genotype–phenotype analysis of DYNC1H1 variants and neuromuscular diseases revealed that mutations in the DYN1 region of DYNC1H1 protein were associated with a more severe phenotype, more complicated symptoms, and more CNS involvement than the DHC_N1 region. Conclusion Our study potentially expanded the knowledge of the phenotypic and genetic spectrum of neuromuscular diseases caused by DYNC1H1 mutations. The genotype–phenotype correlation may reflect the pathogenesis underlying the dyneinopathy caused by DYNC1H1 mutations.
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Affiliation(s)
- Jia-Tong Li
- Department of Neurology, Huashan Hospital and Institute of Neurology, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Si-Qi Dong
- Department of Neurology, Huashan Hospital and Institute of Neurology, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Dong-Qing Zhu
- Department of Neurology, Huashan Hospital and Institute of Neurology, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Wen-Bo Yang
- Department of Neurology, Huashan Hospital and Institute of Neurology, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Ting Qian
- Department of Neurology, Huashan Hospital and Institute of Neurology, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Xiao-Ni Liu
- Department of Neurology, Huashan Hospital and Institute of Neurology, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Xiang-Jun Chen
- Department of Neurology, Huashan Hospital and Institute of Neurology, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
- Human Phenome Institute, Fudan University, Shanghai, China
- *Correspondence: Xiang-Jun Chen ; orcid.org/0000-0002-8108-9013
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14
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Gibson JM, Cui H, Ali MY, Zhao X, Debler EW, Zhao J, Trybus KM, Solmaz SR, Wang C. Coil-to-α-helix transition at the Nup358-BicD2 interface activates BicD2 for dynein recruitment. eLife 2022; 11:74714. [PMID: 35229716 PMCID: PMC8956292 DOI: 10.7554/elife.74714] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 02/28/2022] [Indexed: 11/13/2022] Open
Abstract
Nup358, a protein of the nuclear pore complex, facilitates a nuclear positioning pathway that is essential for many biological processes, including neuromuscular and brain development. Nup358 interacts with the dynein adaptor Bicaudal D2 (BicD2), which in turn recruits the dynein machinery to position the nucleus. However, the molecular mechanisms of the Nup358/BicD2 interaction and the activation of transport remain poorly understood. Here for the first time, we show that a minimal Nup358 domain activates dynein/dynactin/BicD2 for processive motility on microtubules. Using nuclear magnetic resonance titration and chemical exchange saturation transfer, mutagenesis, and circular dichroism spectroscopy, a Nup358 α-helix encompassing residues 2162–2184 was identified, which transitioned from a random coil to an α-helical conformation upon BicD2 binding and formed the core of the Nup358-BicD2 interface. Mutations in this region of Nup358 decreased the Nup358/BicD2 interaction, resulting in decreased dynein recruitment and impaired motility. BicD2 thus recognizes Nup358 through a ‘cargo recognition α-helix,’ a structural feature that may stabilize BicD2 in its activated state and promote processive dynein motility.
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Affiliation(s)
- James M Gibson
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, United States
| | - Heying Cui
- Department of Chemistry, Binghamton University, Binghamton, United States
| | - M Yusuf Ali
- Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, United States
| | - Xioaxin Zhao
- Department of Biological Sciences, Binghamton University, Binghamton, United States
| | - Erik W Debler
- Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, United States
| | - Jing Zhao
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, United States
| | - Kathleen M Trybus
- Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, United States
| | - Sozanne R Solmaz
- Department of Chemistry, Binghamton University, Binghamton, United States
| | - Chunyu Wang
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, United States
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15
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Neurogenic arthrogryposis and the power of phenotyping. Neuromuscul Disord 2021; 31:1062-1069. [PMID: 34736627 DOI: 10.1016/j.nmd.2021.07.399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 07/22/2021] [Accepted: 07/27/2021] [Indexed: 11/23/2022]
Abstract
In this article we review the commonest cause of neurogenic arthrogryposis, termed Spinal Muscular Atrophy Lower Extremity Dominant (SMALED), due to variants in DYNC1H1 and BICD2. We discuss the characteristic clinical and radiological phenotype of this disorder and how this has facilitated the identification of the genetic cause of SMALED2. We also review the similarities and differences between the human SMALED phenotype and mouse models and how this has informed our understanding of the potential mechanisms governing motor neuron loss in these disorders.
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16
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McCray BA, Scherer SS. Axonal Charcot-Marie-Tooth Disease: from Common Pathogenic Mechanisms to Emerging Treatment Opportunities. Neurotherapeutics 2021; 18:2269-2285. [PMID: 34606075 PMCID: PMC8804038 DOI: 10.1007/s13311-021-01099-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/28/2021] [Indexed: 01/12/2023] Open
Abstract
Inherited peripheral neuropathies are a genetically and phenotypically diverse group of disorders that lead to degeneration of peripheral neurons with resulting sensory and motor dysfunction. Genetic neuropathies that primarily cause axonal degeneration, as opposed to demyelination, are most often classified as Charcot-Marie-Tooth disease type 2 (CMT2) and are the focus of this review. Gene identification efforts over the past three decades have dramatically expanded the genetic landscape of CMT and revealed several common pathological mechanisms among various forms of the disease. In some cases, identification of the precise genetic defect and/or the downstream pathological consequences of disease mutations have yielded promising therapeutic opportunities. In this review, we discuss evidence for pathogenic overlap among multiple forms of inherited neuropathy, highlighting genetic defects in axonal transport, mitochondrial dynamics, organelle-organelle contacts, and local axonal protein translation as recurrent pathological processes in inherited axonal neuropathies. We also discuss how these insights have informed emerging treatment strategies, including specific approaches for single forms of neuropathy, as well as more general approaches that have the potential to treat multiple types of neuropathy. Such therapeutic opportunities, made possible by improved understanding of molecular and cellular pathogenesis and advances in gene therapy technologies, herald a new and exciting phase in inherited peripheral neuropathy.
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Affiliation(s)
- Brett A. McCray
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205 USA
| | - Steven S. Scherer
- Department of Neurology, The University of Pennsylvania, Philadelphia, PA 19104 USA
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17
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Tadepalle N, Rugarli EI. Lipid Droplets in the Pathogenesis of Hereditary Spastic Paraplegia. Front Mol Biosci 2021; 8:673977. [PMID: 34041268 PMCID: PMC8141572 DOI: 10.3389/fmolb.2021.673977] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Accepted: 04/26/2021] [Indexed: 12/21/2022] Open
Abstract
Hereditary spastic paraplegias (HSPs) are genetically heterogeneous conditions caused by the progressive dying back of the longest axons in the central nervous system, the corticospinal axons. A wealth of data in the last decade has unraveled disturbances of lipid droplet (LD) biogenesis, maturation, turnover and contact sites in cellular and animal models with perturbed expression and function of HSP proteins. As ubiquitous organelles that segregate neutral lipid into a phospholipid monolayer, LDs are at the cross-road of several processes including lipid metabolism and trafficking, energy homeostasis, and stress signaling cascades. However, their role in brain cells, especially in neurons remains enigmatic. Here, we review experimental findings linking LD abnormalities to defective function of proteins encoded by HSP genes, and discuss arising questions in the context of the pathogenesis of HSP.
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Affiliation(s)
- Nimesha Tadepalle
- Molecular and Cell Biology Laboratory, Salk Institute of Biological Sciences, La Jolla, CA, United States
| | - Elena I Rugarli
- Institute for Genetics, University of Cologne, Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Cologne, Germany.,Center for Molecular Medicine (CMMC),Cologne, Germany
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18
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Cui H, Ali MY, Goyal P, Zhang K, Loh JY, Trybus KM, Solmaz SR. Coiled-coil registry shifts in the F684I mutant of Bicaudal D result in cargo-independent activation of dynein motility. Traffic 2021; 21:463-478. [PMID: 32378283 DOI: 10.1111/tra.12734] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 04/29/2020] [Accepted: 05/01/2020] [Indexed: 11/28/2022]
Abstract
The dynein adaptor Drosophila Bicaudal D (BicD) is auto-inhibited and activates dynein motility only after cargo is bound, but the underlying mechanism is elusive. In contrast, we show that the full-length BicD/F684I mutant activates dynein processivity even in the absence of cargo. Our X-ray structure of the C-terminal domain of the BicD/F684I mutant reveals a coiled-coil registry shift; in the N-terminal region, the two helices of the homodimer are aligned, whereas they are vertically shifted in the wild-type. One chain is partially disordered and this structural flexibility is confirmed by computations, which reveal that the mutant transitions back and forth between the two registries. We propose that a coiled-coil registry shift upon cargo-binding activates BicD for dynein recruitment. Moreover, the human homolog BicD2/F743I exhibits diminished binding of cargo adaptor Nup358, implying that a coiled-coil registry shift may be a mechanism to modulate cargo selection for BicD2-dependent transport pathways.
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Affiliation(s)
- Heying Cui
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York, USA
| | - M Yusuf Ali
- Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, Vermont, USA
| | - Puja Goyal
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York, USA
| | - Kaiqi Zhang
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York, USA
| | - Jia Ying Loh
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York, USA
| | - Kathleen M Trybus
- Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, Vermont, USA
| | - Sozanne R Solmaz
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York, USA
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19
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Vallee RB, Yi J, Quintremil S, Khobrekar N. Roles of the multivalent dynein adaptors BicD2 and RILP in neurons. Neurosci Lett 2021; 752:135796. [PMID: 33667600 DOI: 10.1016/j.neulet.2021.135796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 02/18/2021] [Accepted: 02/20/2021] [Indexed: 01/18/2023]
Abstract
Cytoplasmic dynein is responsible for all forms of retrograde transport in neurons and other cells. Work over several years has led to the identification of a class of coiled-coil domain containing "adaptor" proteins that are responsible for expanding dynein's range of cargo interactions, as well as regulating dynein motor behavior. This brief review focuses first on the BicD family of adaptor proteins, which clearly serve to expand the number of dynein cargo interactions. RILP, another adaptor protein, also interacts with multiple proteins. Surprisingly, this is to mediate a series of steps within a common pathway, higher eukaryotic autophagy. These distinct features have important implications for understanding the full range of dynein adaptor functions.
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Affiliation(s)
- Richard B Vallee
- Columbia University, Department of Pathology and Cell Biology, United States
| | - Julie Yi
- Columbia University, Department of Pathology and Cell Biology, United States
| | | | - Noopur Khobrekar
- Columbia University, Department of Pathology and Cell Biology, United States.
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20
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Frasquet M, Rojas-García R, Argente-Escrig H, Vázquez-Costa JF, Muelas N, Vílchez JJ, Sivera R, Millet E, Barreiro M, Díaz-Manera J, Turon-Sans J, Cortés-Vicente E, Querol L, Ramírez-Jiménez L, Martínez-Rubio D, Sánchez-Monteagudo A, Espinós C, Sevilla T, Lupo V. Distal hereditary motor neuropathies: Mutation spectrum and genotype-phenotype correlation. Eur J Neurol 2021; 28:1334-1343. [PMID: 33369814 DOI: 10.1111/ene.14700] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 11/28/2020] [Accepted: 12/17/2020] [Indexed: 01/12/2023]
Abstract
BACKGROUND AND PURPOSE Distal hereditary motor neuropathies (dHMNs) are a heterogeneous group of disorders characterized by degeneration of the motor component of peripheral nerves. Currently, only 15% to 32.5% of patients with dHMN are characterized genetically. Additionally, the prevalence of these genetic disorders is not well known. Recently, biallelic mutations in the sorbitol dehydrogenase gene (SORD) have been identified as a cause of dHMN, with an estimated frequency in undiagnosed cases of up to 10%. METHODS In the present study, we included 163 patients belonging to 108 different families who were diagnosed with a dHMN and who underwent a thorough genetic screening that included next-generation sequencing and subsequent Sanger sequencing of SORD. RESULTS Most probands were sporadic cases (62.3%), and the most frequent age of onset of symptoms was 2 to 10 years (28.8%). A genetic diagnosis was achieved in 37/108 (34.2%) families and 78/163 (47.8%) of all patients. The most frequent cause of distal hereditary motor neuropathies were mutations in HSPB1 (10.4%), GARS1 (9.8%), BICD2 (8.0%), and DNAJB2 (6.7%) genes. In addition, 3.1% of patients were found to be carriers of biallelic mutations in SORD. Mutations in another seven genes were also identified, although they were much less frequent. Eight new pathogenic mutations were detected, and 17 patients without a definite genetic diagnosis carried variants of uncertain significance. The calculated minimum prevalence of dHMN was 2.3 per 100,000 individuals. CONCLUSIONS This study confirms the genetic heterogeneity of dHMN and that biallelic SORD mutations are a cause of dHMN in different populations.
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Affiliation(s)
- Marina Frasquet
- Neuromuscular Diseases Unit, Department of Neurology, Hospital Universitari i Politècnic La Fe, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain
| | - Ricard Rojas-García
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain.,Neuromuscular Diseases Unit, Department of Neurology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.,Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Herminia Argente-Escrig
- Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain
| | - Juan Francisco Vázquez-Costa
- Neuromuscular Diseases Unit, Department of Neurology, Hospital Universitari i Politècnic La Fe, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain.,Department of Medicine, Universitat de València, Valencia, Spain
| | - Nuria Muelas
- Neuromuscular Diseases Unit, Department of Neurology, Hospital Universitari i Politècnic La Fe, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain
| | - Juan Jesús Vílchez
- Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain
| | - Rafael Sivera
- Department of Neurology, Hospital Francesc de Borja, Gandía, Spain
| | - Elvira Millet
- Department of Clinical Neurophysiology, Hospital Universitari i Politècnic La Fe, Valencia, Spain
| | - Marisa Barreiro
- Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain
| | - Jordi Díaz-Manera
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain.,Neuromuscular Diseases Unit, Department of Neurology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.,Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Janina Turon-Sans
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain.,Neuromuscular Diseases Unit, Department of Neurology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.,Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Elena Cortés-Vicente
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain.,Neuromuscular Diseases Unit, Department of Neurology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.,Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Luis Querol
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain.,Neuromuscular Diseases Unit, Department of Neurology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.,Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Laura Ramírez-Jiménez
- Department of Genomics and Translational Genetics, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain
| | - Dolores Martínez-Rubio
- Unit of Genetics and Genomics of Neuromuscular and Neurodegenerative Disorders, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain.,Rare Diseases Joint Units, INCLIVA and IIS La Fe-CIPF, Valencia, Spain
| | - Ana Sánchez-Monteagudo
- Unit of Genetics and Genomics of Neuromuscular and Neurodegenerative Disorders, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain.,Rare Diseases Joint Units, INCLIVA and IIS La Fe-CIPF, Valencia, Spain
| | - Carmen Espinós
- Unit of Genetics and Genomics of Neuromuscular and Neurodegenerative Disorders, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain.,Rare Diseases Joint Units, INCLIVA and IIS La Fe-CIPF, Valencia, Spain
| | - Teresa Sevilla
- Neuromuscular Diseases Unit, Department of Neurology, Hospital Universitari i Politècnic La Fe, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Spain, Valencia, Spain.,Department of Medicine, Universitat de València, Valencia, Spain
| | - Vincenzo Lupo
- Unit of Genetics and Genomics of Neuromuscular and Neurodegenerative Disorders, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain.,Rare Diseases Joint Units, INCLIVA and IIS La Fe-CIPF, Valencia, Spain
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21
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Ravenscroft G, Clayton JS, Faiz F, Sivadorai P, Milnes D, Cincotta R, Moon P, Kamien B, Edwards M, Delatycki M, Lamont PJ, Chan SH, Colley A, Ma A, Collins F, Hennington L, Zhao T, McGillivray G, Ghedia S, Chao K, O'Donnell-Luria A, Laing NG, Davis MR. Neurogenetic fetal akinesia and arthrogryposis: genetics, expanding genotype-phenotypes and functional genomics. J Med Genet 2020; 58:609-618. [PMID: 33060286 DOI: 10.1136/jmedgenet-2020-106901] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 05/16/2020] [Accepted: 07/05/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND Fetal akinesia and arthrogryposis are clinically and genetically heterogeneous and have traditionally been refractive to genetic diagnosis. The widespread availability of affordable genome-wide sequencing has facilitated accurate genetic diagnosis and gene discovery in these conditions. METHODS We performed next generation sequencing (NGS) in 190 probands with a diagnosis of arthrogryposis multiplex congenita, distal arthrogryposis, fetal akinesia deformation sequence or multiple pterygium syndrome. This sequencing was a combination of bespoke neurogenetic disease gene panels and whole exome sequencing. Only class 4 and 5 variants were reported, except for two cases where the identified variants of unknown significance (VUS) are most likely to be causative for the observed phenotype. Co-segregation studies and confirmation of variants identified by NGS were performed where possible. Functional genomics was performed as required. RESULTS Of the 190 probands, 81 received an accurate genetic diagnosis. All except two of these cases harboured class 4 and/or 5 variants based on the American College of Medical Genetics and Genomics guidelines. We identified phenotypic expansions associated with CACNA1S, CHRNB1, GMPPB and STAC3. We describe a total of 50 novel variants, including a novel missense variant in the recently identified gene for arthrogryposis with brain malformations-SMPD4. CONCLUSIONS Comprehensive gene panels give a diagnosis for a substantial proportion (42%) of fetal akinesia and arthrogryposis cases, even in an unselected cohort. Recently identified genes account for a relatively large proportion, 32%, of the diagnoses. Diagnostic-research collaboration was critical to the diagnosis and variant interpretation in many cases, facilitated genotype-phenotype expansions and reclassified VUS through functional genomics.
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Affiliation(s)
- Gina Ravenscroft
- Harry Perkins Institute of Medical Research, Perth, Western Australia, Australia .,Faculty of Health and Medical Sciences, University of Western Australia, Nedlands, Western Australia, Australia
| | - Joshua S Clayton
- Harry Perkins Institute of Medical Research, Perth, Western Australia, Australia.,Faculty of Health and Medical Sciences, University of Western Australia, Nedlands, Western Australia, Australia
| | - Fathimath Faiz
- PathWest Diagnostic Genomics, Nedlands, Western Australia, Australia
| | - Padma Sivadorai
- PathWest Diagnostic Genomics, Nedlands, Western Australia, Australia
| | - Di Milnes
- Genetic Health Queensland, Royal Brisbane and Women's Hospital, Herston, Queensland, Australia
| | - Rob Cincotta
- Maternal and Fetal Medicine, Mater Mothers' Hospital, Brisbane, Queensland, Australia
| | - Phillip Moon
- Department of Obstetrics, Redland Hospital, Cleveland, Queensland, Australia
| | - Ben Kamien
- Genetic Services WA, Women and Newborn Heath Service, Subiaco, Western Australia, Australia.,Hunter Genetics, Hunter New England Health, New Lambton, New South Wales, Australia
| | - Matthew Edwards
- Hunter Genetics, Hunter New England Health, New Lambton, New South Wales, Australia
| | - Martin Delatycki
- Victorian Clinical Genetics Service, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Phillipa J Lamont
- Neurology, Royal Perth Hospital, Perth, Western Australia, Australia
| | - Sophelia Hs Chan
- Paediatric Neurology Division, Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong, Hong Kong
| | - Alison Colley
- Clinical Genetics Services SWSLHD, Liverpool Hospital, Liverpool, New South Wales, Australia
| | - Alan Ma
- Department of Clinical Genetics, Children's Hospital Westmead, Sydney, New South Wales, Australia
| | - Felicity Collins
- Clinical Genetics Department, Western Sydney Genetics Program, Children's Hospitalat Westmead, Westmead, New South Wales, Australia
| | - Lucinda Hennington
- Mercy Health, Mercy Hospital for Women, Heidelberg, Victoria, Australia.,Austin Health, Melbourne, Victoria, Australia.,Alfred Health, Melbourne, Victoria, Australia
| | - Teresa Zhao
- Victorian Clinical Genetics Service, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - George McGillivray
- Victorian Clinical Genetics Service, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Sondhya Ghedia
- Department of Clinical Genetics, Royal North Shore Hospital, Sydney, New South Wales, Australia
| | - Katherine Chao
- Center for Mendelian Genomics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, Massachusetts, USA
| | - Anne O'Donnell-Luria
- Center for Mendelian Genomics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, Massachusetts, USA
| | - Nigel G Laing
- Harry Perkins Institute of Medical Research, Perth, Western Australia, Australia.,Faculty of Health and Medical Sciences, University of Western Australia, Nedlands, Western Australia, Australia.,PathWest Diagnostic Genomics, Nedlands, Western Australia, Australia
| | - Mark R Davis
- PathWest Diagnostic Genomics, Nedlands, Western Australia, Australia
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22
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Mendoza-Ferreira N, Karakaya M, Cengiz N, Beijer D, Brigatti KW, Gonzaga-Jauregui C, Fuhrmann N, Hölker I, Thelen MP, Zetzsche S, Rombo R, Puffenberger EG, De Jonghe P, Deconinck T, Zuchner S, Strauss KA, Carson V, Schrank B, Wunderlich G, Baets J, Wirth B. De Novo and Inherited Variants in GBF1 are Associated with Axonal Neuropathy Caused by Golgi Fragmentation. Am J Hum Genet 2020; 107:763-777. [PMID: 32937143 PMCID: PMC7491385 DOI: 10.1016/j.ajhg.2020.08.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 08/19/2020] [Indexed: 01/18/2023] Open
Abstract
Distal hereditary motor neuropathies (HMNs) and axonal Charcot-Marie-Tooth neuropathy (CMT2) are clinically and genetically heterogeneous diseases characterized primarily by motor neuron degeneration and distal weakness. The genetic cause for about half of the individuals affected by HMN/CMT2 remains unknown. Here, we report the identification of pathogenic variants in GBF1 (Golgi brefeldin A-resistant guanine nucleotide exchange factor 1) in four unrelated families with individuals affected by sporadic or dominant HMN/CMT2. Genomic sequencing analyses in seven affected individuals uncovered four distinct heterozygous GBF1 variants, two of which occurred de novo. Other known HMN/CMT2-implicated genes were excluded. Affected individuals show HMN/CMT2 with slowly progressive distal muscle weakness and musculoskeletal deformities. Electrophysiological studies confirmed axonal damage with chronic neurogenic changes. Three individuals had additional distal sensory loss. GBF1 encodes a guanine-nucleotide exchange factor that facilitates the activation of members of the ARF (ADP-ribosylation factor) family of small GTPases. GBF1 is mainly involved in the formation of coatomer protein complex (COPI) vesicles, maintenance and function of the Golgi apparatus, and mitochondria migration and positioning. We demonstrate that GBF1 is present in mouse spinal cord and muscle tissues and is particularly abundant in neuropathologically relevant sites, such as the motor neuron and the growth cone. Consistent with the described role of GBF1 in Golgi function and maintenance, we observed marked increase in Golgi fragmentation in primary fibroblasts derived from all affected individuals in this study. Our results not only reinforce the existing link between Golgi fragmentation and neurodegeneration but also demonstrate that pathogenic variants in GBF1 are associated with HMN/CMT2.
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23
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Nishimura N, Kumaki T, Murakami H, Enomoto Y, Katsumata K, Toyoshima K, Kurosawa K. Arthrogryposis multiplex congenita with polymicrogyria and infantile encephalopathy caused by a novel GRIN1 variant. Hum Genome Var 2020; 7:29. [PMID: 33062288 PMCID: PMC7519642 DOI: 10.1038/s41439-020-00116-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 08/11/2020] [Accepted: 08/13/2020] [Indexed: 12/29/2022] Open
Abstract
Variants of GRIN1, which encodes GluN1, are associated with developmental delay, epilepsy, and cortical malformation. Here, we report a case of arthrogryposis multiplex congenita with polymicrogyria and infantile encephalopathy caused by a heterozygous variant, c.1949A>C, p.(Asn650Thr) of GRIN1, which could result in the disruption of the third transmembrane domain (M3) of GluN1. This case expands our understanding of the known phenotypes of GRIN1-related neurodevelopmental disorders.
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Affiliation(s)
- Naoto Nishimura
- Division of Medical Genetics, Kanagawa Children’s Medical Center, Yokohama, Japan
- Department of Pediatrics, National Defense Medical College, Tokorozawa, Japan
| | - Tatsuro Kumaki
- Division of Medical Genetics, Kanagawa Children’s Medical Center, Yokohama, Japan
| | - Hiroaki Murakami
- Division of Medical Genetics, Kanagawa Children’s Medical Center, Yokohama, Japan
| | - Yumi Enomoto
- Clinical Research Institute, Kanagawa Children’s Medical Center, Yokohama, Japan
| | - Kaoru Katsumata
- Department of Neonatology, Kanagawa Children’s Medical Center, Yokohama, Japan
| | - Katsuaki Toyoshima
- Department of Neonatology, Kanagawa Children’s Medical Center, Yokohama, Japan
| | - Kenji Kurosawa
- Division of Medical Genetics, Kanagawa Children’s Medical Center, Yokohama, Japan
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24
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Viollet LM, Swoboda KJ, Mao R, Best H, Ha Y, Toutain A, Guyant-Marechal L, Laroche-Raynaud C, Ghorab K, Barthez MA, Pedespan JM, Hernandorena X, Lia AS, Deleuze JF, Masson C, Nelson I, Nectoux J, Si Y. A novel pathogenic variant in DYNC1H1 causes various upper and lower motor neuron anomalies. Eur J Med Genet 2020; 63:104063. [PMID: 32947049 DOI: 10.1016/j.ejmg.2020.104063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 08/31/2020] [Accepted: 09/08/2020] [Indexed: 12/31/2022]
Abstract
OBJECTIVE To perform genotype-phenotype, clinical and molecular analysis in a large 3-generation family with autosomal dominant congenital spinal muscular atrophy. METHODS Using a combined genetic approach including whole genome scanning, next generation sequencing-based multigene panel, whole genome sequencing, and targeted variant Sanger sequencing, we studied the proband and multiple affected individuals of this family who presented bilateral proximal lower limb muscle weakness and atrophy. RESULTS We identified a novel heterozygous variant, c.1826T > C; p.Ile609Thr, in the DYNC1H1 gene localized within the common haplotype in the 14q32.3 chromosomal region which cosegregated with disease in this large family. Within the family, affected individuals were found to have a wide array of clinical variability. Although some individuals presented the typical lower motor neuron phenotype with areflexia and denervation, others presented with muscle weakness and atrophy, hyperreflexia, and absence of denervation suggesting a predominant upper motor neuron disease. In addition, some affected individuals presented with an intermediate phenotype characterized by hyperreflexia and denervation, expressing a combination of lower and upper motor neuron defects. CONCLUSION Our study demonstrates the wide clinical variability associated with a single disease causing variant in DYNC1H1 gene and this variant demonstrated a high penetrance within this large family.
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Affiliation(s)
- Louis M Viollet
- Pediatric Motor Disorders Research Program and Department of Medical Genetics/Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA.
| | - Kathryn J Swoboda
- Pediatric Motor Disorders Research Program, University of Utah School of Medicine, Salt Lake City, UT and Department of Neurology, Massachusetts General Hospital, Boston, MA, USA.
| | - Rong Mao
- ARUP Institute for Clinical and Experimental Pathology, ARUP Laboratories and Departments of Pathology and Medical Genetics/Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA.
| | - Hunter Best
- ARUP Institute for Clinical and Experimental Pathology, ARUP Laboratories and Departments of Pathology and Medical Genetics/Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA.
| | - Youna Ha
- ARUP Institute for Clinical and Experimental Pathology, ARUP Laboratories, Salt Lake City, UT, USA.
| | | | | | | | | | | | | | | | - Anne-Sophie Lia
- Biochimie et Genetique Moleculaire, Hopital Dupuytren, Limoges, France.
| | | | - Cecile Masson
- Institut Imagine, Hopital Necker Enfants Malades, Paris, France.
| | | | - Juliette Nectoux
- Biochimie et Genetique Moleculaire, Hopital Cochin, Paris, France.
| | - Yue Si
- ARUP Institute for Clinical and Experimental Pathology, ARUP Laboratories and Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, USA; Clinical Genomics Program, GeneDx, MD, USA.
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25
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Tsai MH, Cheng HY, Nian FS, Liu C, Chao NH, Chiang KL, Chen SF, Tsai JW. Impairment in dynein-mediated nuclear translocation by BICD2 C-terminal truncation leads to neuronal migration defect and human brain malformation. Acta Neuropathol Commun 2020; 8:106. [PMID: 32665036 PMCID: PMC7362644 DOI: 10.1186/s40478-020-00971-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 06/19/2020] [Indexed: 02/06/2023] Open
Abstract
During brain development, the nucleus of migrating neurons follows the centrosome and translocates into the leading process. Defects in these migratory events, which affect neuronal migration, cause lissencephaly and other neurodevelopmental disorders. However, the mechanism of nuclear translocation remains elusive. Using whole exome sequencing (WES), we identified a novel nonsense BICD2 variant p.(Lys775Ter) (K775X) from a lissencephaly patient. Interestingly, most BICD2 missense variants have been associated with human spinal muscular atrophy (SMA) without obvious brain malformations. By in utero electroporation, we showed that BicD2 knockdown in mouse embryos inhibited neuronal migration. Surprisingly, we observed severe blockage of neuronal migration in cells overexpressing K775X but not in those expressing wild-type BicD2 or SMA-associated missense variants. The centrosome of the mutant was, on average, positioned farther away from the nucleus, indicating a failure in nuclear translocation without affecting the centrosome movement. Furthermore, BicD2 localized at the nuclear envelope (NE) through its interaction with NE protein Nesprin-2. K775X variant disrupted this interaction and further interrupted the NE recruitment of BicD2 and dynein. Remarkably, fusion of BicD2-K775X with NE-localizing domain KASH resumed neuronal migration. Our results underscore impaired nuclear translocation during neuronal migration as an important pathomechanism of lissencephaly.
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26
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Picher-Martel V, Morin C, Brunet D, Dionne A. SMALED2 with BICD2 gene mutations: Report of two cases and portrayal of a classical phenotype. Neuromuscul Disord 2020; 30:669-673. [PMID: 32709491 DOI: 10.1016/j.nmd.2020.05.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 05/28/2020] [Accepted: 05/29/2020] [Indexed: 10/24/2022]
Abstract
The spinal muscular atrophies (SMA) affect lower motor neurons leading to important muscle atrophy and paralysis. Some cases of SMA affect mostly the lower limbs and are called autosomal dominant spinal muscular atrophy, lower extremity predominant (SMALED). So far, two genes have been identified to cause this phenotype, DYNC1H1 (SMALED1) and BICD2 (SMALED2). This pathology is rare, but patients exhibit classical features which should be recognised by physicians. We present two unrelated cases of SMALED2 with previously described c.320C>T BICD2 mutations. Our cases exhibit non-progressive weakness and atrophy of the lower limbs associated with contractures and unique muscle MRI findings suggestive of classical SMALED2. We also performed an extensive review of the literature to present the classical and atypical phenotypes of BICD2. Indeed, some features appear to be highly suggestive of the disease, including upper limb sparing, sparing of the adductors muscles on physical examination and MRI, congenital contractures and normal nerve conductions studies.
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Affiliation(s)
- Vincent Picher-Martel
- CERVO Brain Research Center, 2601 Chemin de la Canardière, Quebec, Quebec G1J 2G3, Canada; Université Laval, Québec, Canada; CHU de Québec, Hôpital de l'Enfant-Jésus, Département des sciences neurologiques, Quebec, Quebec, Canada.
| | - Clément Morin
- Centre régional de Rimouski, Département de neurologie, Quebec, Quebec, Canada
| | - Denis Brunet
- Université Laval, Québec, Canada; CHU de Québec, Hôpital de l'Enfant-Jésus, Département des sciences neurologiques, Quebec, Quebec, Canada
| | - Annie Dionne
- Université Laval, Québec, Canada; CHU de Québec, Hôpital de l'Enfant-Jésus, Département des sciences neurologiques, Quebec, Quebec, Canada
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27
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Abstract
The intracellular transport system in neurons is specialized to an extraordinary degree, enabling the delivery of critical cargo to sites in axons or dendrites that are far removed from the cell center. Vesicles formed in the cell body are actively transported by kinesin motors along axonal microtubules to presynaptic sites that can be located more than a meter away. Both growth factors and degradative vesicles carrying aged organelles or aggregated proteins take the opposite route, driven by dynein motors. Distance is not the only challenge; precise delivery of cargos to sites of need must also be accomplished. For example, localized delivery of presynaptic components to hundreds of thousands of "en passant" synapses distributed along the length of a single axon in some neuronal subtypes provides a layer of complexity that must be successfully navigated to maintain synaptic transmission. We review recent advances in the field of axonal transport, with a focus on conceptual developments, and highlight our growing quantitative understanding of neuronal trafficking and its role in maintaining the synaptic function that underlies higher cognitive processes such as learning and memory.
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Affiliation(s)
- Pedro Guedes-Dias
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.,Institute of Neuronal Cell Biology, Technische Universität München, 80802 Munich, Germany
| | - Erika L F Holzbaur
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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28
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Rossor AM, Sleigh JN, Groves M, Muntoni F, Reilly MM, Hoogenraad CC, Schiavo G. Loss of BICD2 in muscle drives motor neuron loss in a developmental form of spinal muscular atrophy. Acta Neuropathol Commun 2020; 8:34. [PMID: 32183910 PMCID: PMC7076953 DOI: 10.1186/s40478-020-00909-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Accepted: 03/01/2020] [Indexed: 12/27/2022] Open
Abstract
Autosomal dominant missense mutations in BICD2 cause Spinal Muscular Atrophy Lower Extremity Predominant 2 (SMALED2), a developmental disease of motor neurons. BICD2 is a key component of the cytoplasmic dynein/dynactin motor complex, which in axons drives the microtubule-dependent retrograde transport of intracellular cargo towards the cell soma. Patients with pathological mutations in BICD2 develop malformations of cortical and cerebellar development similar to Bicd2 knockout (-/-) mice. In this study we sought to re-examine the motor neuron phenotype of conditional Bicd2-/- mice. Bicd2-/- mice show a significant reduction in the number of large calibre motor neurons of the L4 ventral root compared to wild type mice. Muscle-specific knockout of Bicd2 results in a similar reduction in L4 ventral axons comparable to global Bicd2-/- mice. Rab6, a small GTPase required for the sorting of exocytic vesicles from the Trans Golgi Network to the plasma membrane is a major binding partner of BICD2. We therefore examined the secretory pathway in SMALED2 patient fibroblasts and demonstrated that BICD2 is required for physiological flow of constitutive secretory cargoes from the Trans Golgi Network to the plasma membrane using a VSV-G reporter assay. Together, these data indicate that BICD2 loss from muscles is a major driver of non-cell autonomous pathology in the motor nervous system, which has important implications for future therapeutic approaches in SMALED2.
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Affiliation(s)
- Alexander M Rossor
- UCL Queen Square Institute of Neurology, University College London, Queen Square, London, WC1N 3BG, UK.
| | - James N Sleigh
- UCL Queen Square Institute of Neurology, University College London, Queen Square, London, WC1N 3BG, UK
- UK Dementia Research Institute, University College London, London, WC1E 6BT, UK
| | - Michael Groves
- UCL Queen Square Institute of Neurology, University College London, Queen Square, London, WC1N 3BG, UK
| | - Francesco Muntoni
- Dubowitz Neuromuscular Centre and National Institute for Health Research Great Ormond Street Hospital Biomedical Research Centre, University College London Institute of Child Health, London, WC1N 1EH, UK
| | - Mary M Reilly
- UCL Queen Square Institute of Neurology, University College London, Queen Square, London, WC1N 3BG, UK
| | - Casper C Hoogenraad
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands
| | - Giampietro Schiavo
- UCL Queen Square Institute of Neurology, University College London, Queen Square, London, WC1N 3BG, UK.
- UK Dementia Research Institute, University College London, London, WC1E 6BT, UK.
- Discoveries Centre for Regenerative and Precision Medicine, University College London Campus, London, WC1N 3BG, UK.
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29
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Koboldt DC, Waldrop MA, Wilson RK, Flanigan KM. The Genotypic and Phenotypic Spectrum of
BICD2
Variants in Spinal Muscular Atrophy. Ann Neurol 2020; 87:487-496. [DOI: 10.1002/ana.25704] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 02/12/2020] [Accepted: 02/12/2020] [Indexed: 12/18/2022]
Affiliation(s)
- Daniel C. Koboldt
- Institute for Genomic Medicine Nationwide Children's Hospital Columbus OH
- Department of Pediatrics Ohio State University Columbus OH
| | - Megan A. Waldrop
- Department of Pediatrics Ohio State University Columbus OH
- Center for Gene Therapy Nationwide Children's Hospital Columbus OH
- Department of Neurology Ohio State University Columbus OH
| | - Richard K. Wilson
- Institute for Genomic Medicine Nationwide Children's Hospital Columbus OH
- Department of Pediatrics Ohio State University Columbus OH
| | - Kevin M. Flanigan
- Department of Pediatrics Ohio State University Columbus OH
- Center for Gene Therapy Nationwide Children's Hospital Columbus OH
- Department of Neurology Ohio State University Columbus OH
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30
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Frasquet M, Camacho A, Vílchez R, Argente‐Escrig H, Millet E, Vázquez‐Costa JF, Silla R, Sánchez‐Monteagudo A, Vílchez JJ, Espinós C, Lupo V, Sevilla T. Clinical spectrum of
BICD2
mutations. Eur J Neurol 2020; 27:1327-1335. [DOI: 10.1111/ene.14173] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 02/03/2020] [Indexed: 11/27/2022]
Affiliation(s)
- M. Frasquet
- Neuromuscular Diseases Unit Neurology Department Hospital Universitari i Politècnic La Fe ValenciaSpain
- Neuromuscular & Ataxias Research Group Instituto de Investigación Sanitaria La Fe ValenciaSpain
- Joint Unit for Research on Rare Diseases CIPF‐IISLa Fe Valencia Spain
| | - A. Camacho
- Division of Child Neurology Hospital Universitario 12 de Octubre MadridSpain
- Faculty of Medicine Complutense University of Madrid Madrid Spain
| | - R. Vílchez
- Neuromuscular & Ataxias Research Group Instituto de Investigación Sanitaria La Fe ValenciaSpain
| | - H. Argente‐Escrig
- Neuromuscular Diseases Unit Neurology Department Hospital Universitari i Politècnic La Fe ValenciaSpain
- Neuromuscular & Ataxias Research Group Instituto de Investigación Sanitaria La Fe ValenciaSpain
- Joint Unit for Research on Rare Diseases CIPF‐IISLa Fe Valencia Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) ValenciaSpain
| | - E. Millet
- Department of Clinical Neurophysiology Hospital Universitari i Politècnic La Fe ValenciaSpain
| | - J. F. Vázquez‐Costa
- Neuromuscular Diseases Unit Neurology Department Hospital Universitari i Politècnic La Fe ValenciaSpain
- Neuromuscular & Ataxias Research Group Instituto de Investigación Sanitaria La Fe ValenciaSpain
- Joint Unit for Research on Rare Diseases CIPF‐IISLa Fe Valencia Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) ValenciaSpain
- Department of Medicine Universitat de València ValenciaSpain
| | - R. Silla
- Neurology Department Hospital Clínico Universitario ValenciaSpain
| | - A. Sánchez‐Monteagudo
- Joint Unit for Research on Rare Diseases CIPF‐IISLa Fe Valencia Spain
- Service of Genomics and Translational Genetics Centro de Investigación Príncipe Felipe (CIPF) ValenciaSpain
| | - J. J. Vílchez
- Neuromuscular Diseases Unit Neurology Department Hospital Universitari i Politècnic La Fe ValenciaSpain
- Neuromuscular & Ataxias Research Group Instituto de Investigación Sanitaria La Fe ValenciaSpain
- Joint Unit for Research on Rare Diseases CIPF‐IISLa Fe Valencia Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) ValenciaSpain
| | - C. Espinós
- Joint Unit for Research on Rare Diseases CIPF‐IISLa Fe Valencia Spain
- Service of Genomics and Translational Genetics Centro de Investigación Príncipe Felipe (CIPF) ValenciaSpain
- Unit of Genetics and Genomics of Neuromuscular and Neurodegenerative Disorders ValenciaSpain
- Department of Genetics Universitat de València Valencia Spain
| | - V. Lupo
- Joint Unit for Research on Rare Diseases CIPF‐IISLa Fe Valencia Spain
- Service of Genomics and Translational Genetics Centro de Investigación Príncipe Felipe (CIPF) ValenciaSpain
- Unit of Genetics and Genomics of Neuromuscular and Neurodegenerative Disorders ValenciaSpain
| | - T. Sevilla
- Neuromuscular Diseases Unit Neurology Department Hospital Universitari i Politècnic La Fe ValenciaSpain
- Neuromuscular & Ataxias Research Group Instituto de Investigación Sanitaria La Fe ValenciaSpain
- Joint Unit for Research on Rare Diseases CIPF‐IISLa Fe Valencia Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) ValenciaSpain
- Department of Medicine Universitat de València ValenciaSpain
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31
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Cui H, Noell CR, Behler RP, Zahn JB, Terry LR, Russ BB, Solmaz SR. Adapter Proteins for Opposing Motors Interact Simultaneously with Nuclear Pore Protein Nup358. Biochemistry 2019; 58:5085-5097. [PMID: 31756096 DOI: 10.1021/acs.biochem.9b00907] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Nup358 is a protein subunit of the nuclear pore complex that recruits the opposing microtubule motors kinesin-1 and dynein [via the dynein adaptor Bicaudal D2 (BicD2)] to the nuclear envelope. This pathway is important for positioning of the nucleus during the early steps of mitotic spindle assembly and also essential for an important process in brain development. It is unknown whether dynein and kinesin-1 interact with Nup358 simultaneously or whether they compete. Here, we have reconstituted and characterized a minimal complex of kinesin-1 light chain 2 (KLC2) and Nup358. The proteins interact through a W-acidic motif in Nup358, which is highly conserved among vertebrates but absent in insects. While Nup358 and KLC2 form predominantly monomers, their interaction results in the formation of 2:2 complexes, and the W-acidic motif is required for the oligomerization. In active motor complexes, BicD2 and KLC2 each form dimers. Notably, we show that the dynein adaptor BicD2 and KLC2 interact simultaneously with Nup358, resulting in the formation of 2:2:2 complexes. Mutation of the W-acidic motif results in the formation of 1:1:1 complexes. On the basis of our data, we propose that Nup358 recruits simultaneously one kinesin-1 motor and one dynein motor via BicD2 to the nucleus. We hypothesize that the binding sites are close enough to promote direct interactions between these motor recognition domains, which may be important for the regulation of the motility of these opposing motors. Our data provide important insights into a nuclear positioning pathway that is crucial for brain development and faithful chromosome segregation.
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Affiliation(s)
- Heying Cui
- Department of Chemistry , Binghamton University , P.O. Box 6000, Binghamton , New York 13902 , United States
| | - Crystal R Noell
- Department of Chemistry , Binghamton University , P.O. Box 6000, Binghamton , New York 13902 , United States
| | - Rachael P Behler
- Department of Chemistry , Binghamton University , P.O. Box 6000, Binghamton , New York 13902 , United States
| | - Jacqueline B Zahn
- Department of Chemistry , Binghamton University , P.O. Box 6000, Binghamton , New York 13902 , United States
| | - Lynn R Terry
- Department of Chemistry , Binghamton University , P.O. Box 6000, Binghamton , New York 13902 , United States
| | - Blaine B Russ
- Department of Chemistry , Binghamton University , P.O. Box 6000, Binghamton , New York 13902 , United States
| | - Sozanne R Solmaz
- Department of Chemistry , Binghamton University , P.O. Box 6000, Binghamton , New York 13902 , United States
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32
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Will L, Portegies S, van Schelt J, van Luyk M, Jaarsma D, Hoogenraad CC. Dynein activating adaptor BICD2 controls radial migration of upper-layer cortical neurons in vivo. Acta Neuropathol Commun 2019; 7:162. [PMID: 31655624 PMCID: PMC6815425 DOI: 10.1186/s40478-019-0827-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 10/03/2019] [Indexed: 01/19/2023] Open
Abstract
For the proper organization of the six-layered mammalian neocortex it is required that neurons migrate radially from their place of birth towards their designated destination. The molecular machinery underlying this neuronal migration is still poorly understood. The dynein-adaptor protein BICD2 is associated with a spectrum of human neurological diseases, including malformations of cortical development. Previous studies have shown that knockdown of BICD2 interferes with interkinetic nuclear migration in radial glial progenitor cells, and that Bicd2-deficient mice display an altered laminar organization of the cerebellum and the neocortex. However, the precise in vivo role of BICD2 in neocortical development remains unclear. By comparing cell-type specific conditional Bicd2 knock-out mice, we found that radial migration in the cortex predominantly depends on BICD2 function in post-mitotic neurons. Neuron-specific Bicd2 cKO mice showed severely impaired radial migration of late-born upper-layer neurons. BICD2 depletion in cortical neurons interfered with proper Golgi organization, and neuronal maturation and survival of cortical plate neurons. Single-neuron labeling revealed a specific role of BICD2 in bipolar locomotion. Rescue experiments with wildtype and disease-related mutant BICD2 constructs revealed that a point-mutation in the RAB6/RANBP2-binding-domain, associated with cortical malformation in patients, fails to restore proper cortical neuron migration. Together, these findings demonstrate a novel, cell-intrinsic role of BICD2 in cortical neuron migration in vivo and provide new insights into BICD2-dependent dynein-mediated functions during cortical development.
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33
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Noell CR, Loh JY, Debler EW, Loftus KM, Cui H, Russ BB, Zhang K, Goyal P, Solmaz SR. Role of Coiled-Coil Registry Shifts in the Activation of Human Bicaudal D2 for Dynein Recruitment upon Cargo Binding. J Phys Chem Lett 2019; 10:4362-4367. [PMID: 31306018 PMCID: PMC7243283 DOI: 10.1021/acs.jpclett.9b01865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Dynein adaptors such as Bicaudal D2 (BicD2) recognize cargo for dynein-dependent transport, and cargo-bound adaptors are required to activate dynein for processive transport, but the mechanism of action is unknown. Here we report the X-ray structure of the cargo-binding domain of human BicD2 and investigate the structural dynamics of the coiled-coil. Our molecular dynamics simulations support the fact that BicD2 can switch from a homotypic coiled-coil registry, in which both helices of the homodimer are aligned, to an asymmetric registry, where a portion of one helix is vertically shifted, as both states are similarly stable and defined by distinct conformations of F743. The F743I variant increases dynein recruitment in the Drosophila homologue, whereas the human R747C variant causes spinal muscular atrophy. We report spontaneous registry shifts for both variants, which may be the cause for BicD2 hyperactivation and disease. We propose that a registry shift upon cargo binding may activate autoinhibited BicD2 for dynein recruitment.
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Affiliation(s)
- Crystal R. Noell
- Department of Chemistry, State University of New York at Binghamton, P.O. Box 6000, Binghamton, New York 13902, United States
| | - Jia Ying Loh
- Department of Chemistry, State University of New York at Binghamton, P.O. Box 6000, Binghamton, New York 13902, United States
| | - Erik W. Debler
- Department of Biochemistry & Molecular Biology, Thomas Jefferson University, 1020 Locust Street, Philadelphia, Pennsylvania 19107, United States
| | - Kyle M. Loftus
- Department of Chemistry, State University of New York at Binghamton, P.O. Box 6000, Binghamton, New York 13902, United States
| | - Heying Cui
- Department of Chemistry, State University of New York at Binghamton, P.O. Box 6000, Binghamton, New York 13902, United States
| | - Blaine B. Russ
- Department of Chemistry, State University of New York at Binghamton, P.O. Box 6000, Binghamton, New York 13902, United States
| | - Kaiqi Zhang
- Department of Chemistry, State University of New York at Binghamton, P.O. Box 6000, Binghamton, New York 13902, United States
| | - Puja Goyal
- Department of Chemistry, State University of New York at Binghamton, P.O. Box 6000, Binghamton, New York 13902, United States
- Corresponding Authors:. Tel: +1 607 777 4308 (P.G.)., . Tel: +1 607 777 2089 (S.R.S.)
| | - Sozanne R. Solmaz
- Department of Chemistry, State University of New York at Binghamton, P.O. Box 6000, Binghamton, New York 13902, United States
- Corresponding Authors:. Tel: +1 607 777 4308 (P.G.)., . Tel: +1 607 777 2089 (S.R.S.)
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34
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Bergendahl LT, Gerasimavicius L, Miles J, Macdonald L, Wells JN, Welburn JPI, Marsh JA. The role of protein complexes in human genetic disease. Protein Sci 2019; 28:1400-1411. [PMID: 31219644 DOI: 10.1002/pro.3667] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Accepted: 06/10/2019] [Indexed: 12/20/2022]
Abstract
Many human genetic disorders are caused by mutations in protein-coding regions of DNA. Taking protein structure into account has therefore provided key insight into the molecular mechanisms underlying human genetic disease. Although most studies have focused on the intramolecular effects of mutations, the critical role of the assembly of proteins into complexes is being increasingly recognized. Here, we review multiple ways in which consideration of protein complexes can help us to understand and explain the effects of pathogenic mutations. First, we discuss disorders caused by mutations that perturb intersubunit interactions in homomeric and heteromeric complexes. Second, we address how protein complex assembly can facilitate a dominant-negative mechanism, whereby mutated subunits can disrupt the activity of wild-type protein. Third, we show how mutations that change protein expression levels can lead to damaging stoichiometric imbalances. Finally, we review how mutations affecting different subunits of the same heteromeric complex often cause similar diseases, whereas mutations in different interfaces of the same subunit can cause distinct phenotypes.
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Affiliation(s)
- L Therese Bergendahl
- MRC Human Genetics Unit, Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, EH4 2XU, United Kingdom
| | - Lukas Gerasimavicius
- MRC Human Genetics Unit, Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, EH4 2XU, United Kingdom
| | - Jamilla Miles
- MRC Human Genetics Unit, Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, EH4 2XU, United Kingdom
| | - Lewis Macdonald
- MRC Human Genetics Unit, Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, EH4 2XU, United Kingdom
| | - Jonathan N Wells
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, 14850
| | - Julie P I Welburn
- Wellcome Trust Centre for Cell Biology, School of Biological Sciences, University of Edinburgh, Edinburgh, EH9 3BF, United Kingdom
| | - Joseph A Marsh
- MRC Human Genetics Unit, Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, EH4 2XU, United Kingdom
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35
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Rasika S, Passemard S, Verloes A, Gressens P, El Ghouzzi V. Golgipathies in Neurodevelopment: A New View of Old Defects. Dev Neurosci 2019; 40:396-416. [PMID: 30878996 DOI: 10.1159/000497035] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 01/16/2019] [Indexed: 11/19/2022] Open
Abstract
The Golgi apparatus (GA) is involved in a whole spectrum of activities, from lipid biosynthesis and membrane secretion to the posttranslational processing and trafficking of most proteins, the control of mitosis, cell polarity, migration and morphogenesis, and diverse processes such as apoptosis, autophagy, and the stress response. In keeping with its versatility, mutations in GA proteins lead to a number of different disorders, including syndromes with multisystem involvement. Intriguingly, however, > 40% of the GA-related genes known to be associated with disease affect the central or peripheral nervous system, highlighting the critical importance of the GA for neural function. We have previously proposed the term "Golgipathies" in relation to a group of disorders in which mutations in GA proteins or their molecular partners lead to consequences for brain development, in particular postnatal-onset microcephaly (POM), white-matter defects, and intellectual disability (ID). Here, taking into account the broader role of the GA in the nervous system, we refine and enlarge this emerging concept to include other disorders whose symptoms may be indicative of altered neurodevelopmental processes, from neurogenesis to neuronal migration and the secretory function critical for the maturation of postmitotic neurons and myelination.
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Affiliation(s)
- Sowmyalakshmi Rasika
- NeuroDiderot, INSERM UMR1141, Université Paris Diderot, Sorbonne Paris Cité, Paris, France.,AP HP, Hôpital Robert Debré, UF de Génétique Clinique, Paris, France
| | - Sandrine Passemard
- NeuroDiderot, INSERM UMR1141, Université Paris Diderot, Sorbonne Paris Cité, Paris, France.,AP HP, Hôpital Robert Debré, UF de Génétique Clinique, Paris, France
| | - Alain Verloes
- NeuroDiderot, INSERM UMR1141, Université Paris Diderot, Sorbonne Paris Cité, Paris, France.,AP HP, Hôpital Robert Debré, UF de Génétique Clinique, Paris, France
| | - Pierre Gressens
- NeuroDiderot, INSERM UMR1141, Université Paris Diderot, Sorbonne Paris Cité, Paris, France.,Centre for the Developing Brain, Division of Imaging Sciences and Biomedical Engineering, King's College London, King's Health Partners, St. Thomas' Hospital, London, United Kingdom
| | - Vincent El Ghouzzi
- NeuroDiderot, INSERM UMR1141, Université Paris Diderot, Sorbonne Paris Cité, Paris, France,
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36
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Martinez Carrera LA, Gabriel E, Donohoe CD, Hölker I, Mariappan A, Storbeck M, Uhlirova M, Gopalakrishnan J, Wirth B. Novel insights into SMALED2: BICD2 mutations increase microtubule stability and cause defects in axonal and NMJ development. Hum Mol Genet 2019. [PMID: 29528393 DOI: 10.1093/hmg/ddy086] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Bicaudal D2 (BICD2) encodes a highly conserved motor adaptor protein that regulates the dynein-dynactin complex in different cellular processes. Heterozygous mutations in BICD2 cause autosomal dominant lower extremity-predominant spinal muscular atrophy-2 (SMALED2). Although, various BICD2 mutations have been shown to alter interactions with different binding partners or the integrity of the Golgi apparatus, the specific pathological effects of BICD2 mutations underlying SMALED2 remain elusive. Here, we show that the fibroblasts derived from individuals with SMALED2 exhibit stable microtubules. Importantly, this effect was observed regardless of where the BICD2 mutation is located, which unifies the most likely cellular mechanism affecting microtubules. Significantly, overexpression of SMALED2-causing BICD2 mutations in the disease-relevant cell type, motor neurons, also results in an increased microtubule stability which is accompanied by axonal aberrations such as collateral branching and overgrowth. To study the pathological consequences of BICD2 mutations in vivo, and to address the controversial debate whether two of these mutations are neuron or muscle specific, we generated the first Drosophila model of SMALED2. Strikingly, neuron-specific expression of BICD2 mutants resulted in reduced neuromuscular junction size in larvae and impaired locomotion of adult flies. In contrast, expressing BICD2 mutations in muscles had no obvious effect on motor function, supporting a primarily neurological etiology of the disease. Thus, our findings contribute to the better understanding of SMALED2 pathology by providing evidence for a common pathomechanism of BICD2 mutations that increase microtubule stability in motor neurons leading to increased axonal branching and to impaired neuromuscular junction development.
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Affiliation(s)
- Lilian A Martinez Carrera
- Institute of Human Genetics, University of Cologne, 50931 Cologne, Germany.,Institute for Genetics, University of Cologne, 50674 Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, 50931 Cologne, Germany
| | - Elke Gabriel
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, 50931 Cologne, Germany
| | - Colin D Donohoe
- Institute for Genetics, University of Cologne, 50674 Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Irmgard Hölker
- Institute of Human Genetics, University of Cologne, 50931 Cologne, Germany.,Institute for Genetics, University of Cologne, 50674 Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, 50931 Cologne, Germany
| | - Aruljothi Mariappan
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, 50931 Cologne, Germany
| | - Markus Storbeck
- Institute of Human Genetics, University of Cologne, 50931 Cologne, Germany.,Institute for Genetics, University of Cologne, 50674 Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, 50931 Cologne, Germany
| | - Mirka Uhlirova
- Institute for Genetics, University of Cologne, 50674 Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931 Cologne, Germany
| | - Jay Gopalakrishnan
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, 50931 Cologne, Germany
| | - Brunhilde Wirth
- Institute of Human Genetics, University of Cologne, 50931 Cologne, Germany.,Institute for Genetics, University of Cologne, 50674 Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, 50931 Cologne, Germany.,Center for Rare Diseases Cologne, University Hospital of Cologne, 50931 Cologne, Germany
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37
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Milone M, Liewluck T. The unfolding spectrum of inherited distal myopathies. Muscle Nerve 2018; 59:283-294. [PMID: 30171629 DOI: 10.1002/mus.26332] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 08/26/2018] [Accepted: 08/28/2018] [Indexed: 12/30/2022]
Abstract
Distal myopathies are a group of rare muscle diseases characterized by distal weakness at onset. Although acquired myopathies can occasionally present with distal weakness, the majority of distal myopathies have a genetic etiology. Their age of onset varies from early-childhood to late-adulthood while the predominant muscle weakness can affect calf, ankle dorsiflexor, or distal upper limb muscles. A spectrum of muscle pathological changes, varying from nonspecific myopathic changes to rimmed vacuoles to myofibrillar pathology to nuclei centralization, have been noted. Likewise, the underlying molecular defect is heterogeneous. In addition, there is emerging evidence that distal myopathies can result from defective proteins encoded by genes causative of neurogenic disorders, be manifestation of multisystem proteinopathies or the result of the altered interplay between different genes. In this review, we provide an overview on the clinical, electrophysiological, pathological, and molecular aspects of distal myopathies, focusing on the most recent developments in the field. Muscle Nerve 59:283-294, 2019.
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Affiliation(s)
| | - Teerin Liewluck
- Department of Neurology, Mayo Clinic, Rochester, Minnesota, USA
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38
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Noell CR, Loftus KM, Cui H, Grewer C, Kizer M, Debler EW, Solmaz SR. A Quantitative Model for BicD2/Cargo Interactions. Biochemistry 2018; 57:6538-6550. [PMID: 30345745 DOI: 10.1021/acs.biochem.8b00987] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Dynein adaptor proteins such as Bicaudal D2 (BicD2) are integral components of the dynein transport machinery, as they recognize cargoes for cell cycle-specific transport and link them to the motor complex. Human BicD2 switches from selecting secretory and Golgi-derived vesicles for transport in G1 and S phase (by recognizing Rab6GTP), to selecting the nucleus for transport in G2 phase (by recognizing nuclear pore protein Nup358), but the molecular mechanisms governing this switch are elusive. Here, we have developed a quantitative model for BicD2/cargo interactions that integrates affinities, oligomeric states, and cellular concentrations of the reactants. BicD2 and cargo form predominantly 2:2 complexes. Furthermore, the affinity of BicD2 toward its cargo Nup358 is higher than that toward Rab6GTP. Based on our calculations, an estimated 1000 BicD2 molecules per cell would be recruited to the nucleus through Nup358 in the absence of regulation. Notably, RanGTP is a negative regulator of the Nup358/BicD2 interaction that weakens the affinity by a factor of 10 and may play a role in averting dynein recruitment to the nucleus outside of the G2 phase. However, our quantitative model predicts that an additional negative regulator remains to be identified. In the absence of negative regulation, the affinity of Nup358 would likely be sufficient to recruit BicD2 to the nucleus in G2 phase. Our quantitative model makes testable predictions of how cellular transport events are orchestrated. These transport processes are important for brain development, cell cycle control, signaling, and neurotransmission at synapses.
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Affiliation(s)
- Crystal R Noell
- Department of Chemistry , State University of New York at Binghamton , Binghamton , New York 13902 , United States
| | - Kyle M Loftus
- Department of Chemistry , State University of New York at Binghamton , Binghamton , New York 13902 , United States
| | - Heying Cui
- Department of Chemistry , State University of New York at Binghamton , Binghamton , New York 13902 , United States
| | - Christof Grewer
- Department of Chemistry , State University of New York at Binghamton , Binghamton , New York 13902 , United States
| | - Megan Kizer
- Department of Chemistry , State University of New York at Binghamton , Binghamton , New York 13902 , United States
| | - Erik W Debler
- Department of Biochemistry & Molecular Biology , Thomas Jefferson University , Philadelphia , Pennsylvania 19107 , United States
| | - Sozanne R Solmaz
- Department of Chemistry , State University of New York at Binghamton , Binghamton , New York 13902 , United States
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39
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Koboldt DC, Kastury RD, Waldrop MA, Kelly BJ, Mosher TM, McLaughlin H, Corsmeier D, Slaughter JL, Flanigan KM, McBride KL, Mehta L, Wilson RK, White P. In-frame de novo mutation in BICD2 in two patients with muscular atrophy and arthrogryposis. Cold Spring Harb Mol Case Stud 2018; 4:mcs.a003160. [PMID: 30054298 PMCID: PMC6169820 DOI: 10.1101/mcs.a003160] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 07/23/2018] [Indexed: 01/10/2023] Open
Abstract
We describe two unrelated patients, a 12-yr-old female and a 6-yr-old male, with congenital contractures and severe congenital muscular atrophy. Exome and genome sequencing of the probands and their unaffected parents revealed that they have the same de novo deletion in BICD2 (c.1636_1638delAAT). The variant, which has never been reported, results in an in-frame 3-bp deletion and is predicted to cause loss of an evolutionarily conserved asparagine residue at position 546 in the protein. Missense mutations in BICD2 cause autosomal dominant spinal muscular atrophy, lower-extremity predominant 2 (SMALED2), a disease characterized by muscle weakness and arthrogryposis of early onset and slow progression. The p.Asn546del clusters with four pathogenic missense variants in a region that likely binds molecular motor KIF5A. Protein modeling suggests that removing the highly conserved asparagine residue alters BICD2 protein structure. Our findings support a broader phenotypic spectrum of BICD2 mutations that may include severe manifestations such as cerebral atrophy, seizures, dysmorphic facial features, and profound muscular atrophy.
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Affiliation(s)
- Daniel C Koboldt
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Rama D Kastury
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Megan A Waldrop
- Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA.,Center for Gene Therapy, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Benjamin J Kelly
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Theresa Mihalic Mosher
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA.,Division of Genetic and Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | | | - Don Corsmeier
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Jonathan L Slaughter
- Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA.,Center for Perinatal Research and Division of Neonatology, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Kevin M Flanigan
- Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA.,Center for Gene Therapy, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Neurology, The Ohio State University, Columbus, Ohio 43210, USA
| | - Kim L McBride
- Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA.,Division of Genetic and Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Lakshmi Mehta
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA.,Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Richard K Wilson
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Peter White
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
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40
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Karakaya M, Storbeck M, Strathmann EA, Delle Vedove A, Hölker I, Altmueller J, Naghiyeva L, Schmitz-Steinkrüger L, Vezyroglou K, Motameny S, Alawbathani S, Thiele H, Polat AI, Okur D, Boostani R, Karimiani EG, Wunderlich G, Ardicli D, Topaloglu H, Kirschner J, Schrank B, Maroofian R, Magnusson O, Yis U, Nürnberg P, Heller R, Wirth B. Targeted sequencing with expanded gene profile enables high diagnostic yield in non-5q-spinal muscular atrophies. Hum Mutat 2018; 39:1284-1298. [PMID: 29858556 DOI: 10.1002/humu.23560] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 05/14/2018] [Accepted: 05/30/2018] [Indexed: 11/08/2022]
Abstract
Spinal muscular atrophies (SMAs) are a heterogeneous group of disorders characterized by muscular atrophy, weakness, and hypotonia due to suspected lower motor neuron degeneration (LMND). In a large cohort of 3,465 individuals suspected with SMA submitted for SMN1 testing to our routine diagnostic laboratory, 48.8% carried a homozygous SMN1 deletion, 2.8% a subtle mutation, and an SMN1 deletion, whereas 48.4% remained undiagnosed. Recently, several other genes implicated in SMA/LMND have been reported. Despite several efforts to establish a diagnostic algorithm for non-5q-SMA (SMA without deletion or point mutations in SMN1 [5q13.2]), data from large-scale studies are not available. We tested the clinical utility of targeted sequencing in non-5q-SMA by developing two different gene panels. We first analyzed 30 individuals with a small panel including 62 genes associated with LMND using IonTorrent-AmpliSeq target enrichment. Then, additional 65 individuals were tested with a broader panel encompassing up to 479 genes implicated in neuromuscular diseases (NMDs) with Agilent-SureSelect target enrichment. The NMD panel provided a higher diagnostic yield (33%) than the restricted LMND panel (13%). Nondiagnosed cases were further subjected to exome or genome sequencing. Our experience supports the use of gene panels covering a broad disease spectrum for diseases that are highly heterogeneous and clinically difficult to differentiate.
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Affiliation(s)
- Mert Karakaya
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
| | - Markus Storbeck
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
| | - Eike A Strathmann
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
| | - Andrea Delle Vedove
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
| | - Irmgard Hölker
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
| | - Janine Altmueller
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany.,Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Leyla Naghiyeva
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
| | - Lea Schmitz-Steinkrüger
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
| | - Katharina Vezyroglou
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
| | - Susanne Motameny
- Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Salem Alawbathani
- Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Holger Thiele
- Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Ayse Ipek Polat
- Dokuz Eylül University, Department of Pediatric Neurology, Izmir, Turkey
| | - Derya Okur
- Dokuz Eylül University, Department of Pediatric Neurology, Izmir, Turkey
| | - Reza Boostani
- Mashhad University of Medical Sciences, Department of Neurology, Mashhad, Iran
| | - Ehsan Ghayoor Karimiani
- Next Generation Genetic Polyclinic, Mashhad, Iran.,Razavi Cancer Research Center, Razavi Hospital, Imam Reza International University, Mashhad, Iran
| | | | - Didem Ardicli
- Hacettepe University, Department of Pediatric Neurology, Ankara, Turkey
| | - Haluk Topaloglu
- Hacettepe University, Department of Pediatric Neurology, Ankara, Turkey
| | - Janbernd Kirschner
- Department of Neuropediatrics and Muscle Disorders, Faculty of Medicine, Medical Center, University of Freiburg, Freiburg, Germany
| | - Bertold Schrank
- DKD HELIOS Kliniken, Department of Neurology, Wiesbaden, Germany
| | - Reza Maroofian
- Genetics and Molecular Cell Sciences Research Centre, St George's University of London, London, UK
| | | | - Uluc Yis
- Dokuz Eylül University, Department of Pediatric Neurology, Izmir, Turkey
| | - Peter Nürnberg
- Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Raoul Heller
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
| | - Brunhilde Wirth
- Institute of Human Genetics, Center for Molecular Medicine Cologne, Institute of Genetics, and Center for Rare Diseases Cologne, University of Cologne, Cologne, Germany
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Shi L, Hines T, Bergson C, Smith D. Coupling of microtubule motors with AP-3 generated organelles in axons by NEEP21 family member calcyon. Mol Biol Cell 2018; 29:2055-2068. [PMID: 29949458 PMCID: PMC6232961 DOI: 10.1091/mbc.e18-01-0007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Transport of late endosomes and lysosome-related organelles (LE/LROs) in axons is essential for supplying synaptic cargoes and for removing damaged macromolecules. Defects in this system are implicated in a range of human neurodegenerative and neurodevelopmental disorders. The findings reported here identify a novel mechanism regulating LE/LRO transport based on the coordinated coupling of microtubule motors and vesicle coat proteins to the neuron-enriched, transmembrane protein calcyon (Caly). We found that the cytoplasmic C-terminus of Caly pulled down proteins involved in microtubule-dependent transport (DIC, KIF5A, p150Glued, Lis1) and organelle biogenesis (AP-1 and AP-3) from the brain. In addition, RNA interference-mediated knockdown of Caly increased the percentage of static LE/LROs labeled by LysoTracker in cultured dorsal root ganglion axons. In contrast, overexpression of Caly stimulated movement of organelles positive for LysoTracker or the AP-3 cargo GFP-PI4KIIα. However, a Caly mutant (ATEA) that does not bind AP-3 was unable to pull down motor proteins from brain, and expression of the ATEA mutant failed to increase either LE/LRO flux or levels of associated dynein. Taken together, these data support the hypothesis that Caly is a multifunctional scaffolding protein that regulates axonal transport of LE/LROs by coordinately interacting with motor and vesicle coat proteins.
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Affiliation(s)
- Liang Shi
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, GA 30912
| | - Timothy Hines
- Department of Biological Sciences, University of South Carolina, Columbia, SC 29208
| | - Clare Bergson
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, GA 30912
| | - Deanna Smith
- Department of Biological Sciences, University of South Carolina, Columbia, SC 29208
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Thompson LW, Morrison KD, Shirran SL, Groen EJN, Gillingwater TH, Botting CH, Sleeman JE. Neurochondrin interacts with the SMN protein suggesting a novel mechanism for spinal muscular atrophy pathology. J Cell Sci 2018; 131:jcs.211482. [PMID: 29507115 PMCID: PMC5963842 DOI: 10.1242/jcs.211482] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 02/16/2018] [Indexed: 12/15/2022] Open
Abstract
Spinal muscular atrophy (SMA) is an inherited neurodegenerative condition caused by a reduction in the amount of functional survival motor neuron (SMN) protein. SMN has been implicated in transport of mRNA in neural cells for local translation. We previously identified microtubule-dependent mobile vesicles rich in SMN and SNRPB, a member of the Sm family of small nuclear ribonucleoprotein (snRNP)-associated proteins, in neural cells. By comparing the interactomes of SNRPB and SNRPN, a neural-specific Sm protein, we now show that the essential neural protein neurochondrin (NCDN) interacts with Sm proteins and SMN in the context of mobile vesicles in neurites. NCDN has roles in protein localisation in neural cells and in maintenance of cell polarity. NCDN is required for the correct localisation of SMN, suggesting they may both be required for formation and transport of trafficking vesicles. NCDN may have potential as a therapeutic target for SMA together with, or in place of the targeting of SMN expression. This article has an associated First Person interview with the first author of the paper. Highlighted Article: The essential neural protein neurochondrin interacts with the spinal muscular atrophy (SMA) protein SMN in cell lines and in mice. This might be relevant to the molecular pathology of SMA.
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Affiliation(s)
- Luke W Thompson
- School of Biology, University of St Andrews, BSRC Complex, North Haugh St Andrews, KY16 9ST, UK
| | - Kim D Morrison
- School of Biology, University of St Andrews, BSRC Complex, North Haugh St Andrews, KY16 9ST, UK
| | - Sally L Shirran
- School of Biology, University of St Andrews, BSRC Complex, North Haugh St Andrews, KY16 9ST, UK
| | - Ewout J N Groen
- Edinburgh Medical School, Biomedical Sciences and Euan MacDonald Centre for Motor Neuron Disease Research, University of Edinburgh, Hugh Robson Building, George Square, Edinburgh, EH8 9XD, UK
| | - Thomas H Gillingwater
- Edinburgh Medical School, Biomedical Sciences and Euan MacDonald Centre for Motor Neuron Disease Research, University of Edinburgh, Hugh Robson Building, George Square, Edinburgh, EH8 9XD, UK
| | - Catherine H Botting
- School of Biology, University of St Andrews, BSRC Complex, North Haugh St Andrews, KY16 9ST, UK
| | - Judith E Sleeman
- School of Biology, University of St Andrews, BSRC Complex, North Haugh St Andrews, KY16 9ST, UK
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Novel BICD2 mutation in a Japanese family with autosomal dominant lower extremity-predominant spinal muscular atrophy-2. Brain Dev 2018; 40:343-347. [PMID: 29273277 DOI: 10.1016/j.braindev.2017.12.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 12/01/2017] [Accepted: 12/01/2017] [Indexed: 11/22/2022]
Abstract
INTRODUCTION The most common form of spinal muscular atrophy (SMA) is a recessive disorder caused by SMN1 mutations in 5q13, whereas the genetic etiologies of non-5q SMA are very heterogenous and largely remain to be elucidated. We present a father and son with atrophy and weakness of the lower leg muscles since infancy. Genetic studies in this family revealed a novel BICD2 mutation causing autosomal dominant lower extremity-predominant SMA type 2. PATIENTS The proband was the father, aged 30, and the son was aged 3. Both of them were born uneventfully to nonconsanguineous parents. While the father first walked at the age of 19 months, the son was unable to walk at age 3 years. In both, knee and ankle reflexes were absent and sensation was intact. Serum creatine kinase levels were normal. The son showed congenital arthrogryposis and underwent orthopedic corrections for talipes calcaneovalgus. Investigation of the father at the age of 5 years revealed normal results on nerve conduction studies and sural nerve biopsy. Electromyography showed chronic neurogenic change, and muscle biopsy showed features suggestive of denervation. The father was diagnosed clinically with a sporadic distal SMA. Follow-up studies showed very slow progression. INVESTIGATIONS AND RESULTS Next-generation and Sanger sequencing revealed a deleterious mutation in BICD2: c.1667A>G, p.Tyr556Cys, in this family. DISCUSSION BICD2 is a cytoplasmic conserved motor-adaptor protein involved in anterograde and retrograde transport along the microtubules. Next-generation sequencing will further clarify the genetic basis of non-5q SMA.
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Banworth MJ, Li G. Consequences of Rab GTPase dysfunction in genetic or acquired human diseases. Small GTPases 2018. [PMID: 29239692 DOI: 10.1080/215412481397833] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/23/2023] Open
Abstract
Rab GTPases are important regulators of intracellular membrane trafficking in eukaryotes. Both activating and inactivating mutations in Rab genes have been identified and implicated in human diseases ranging from neurological disorders to cancer. In addition, altered Rab expression is often associated with disease prognosis. As such, the study of diseases associated with Rabs or Rab-interacting proteins has shed light on the important role of intracellular membrane trafficking in disease etiology. In this review, we cover recent advances in the field with an emphasis on cellular mechanisms.
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Affiliation(s)
- Marcellus J Banworth
- a Department of Biochemistry and Molecular Biology , University of Oklahoma Health Sciences Center , Oklahoma City , OK , USA
| | - Guangpu Li
- a Department of Biochemistry and Molecular Biology , University of Oklahoma Health Sciences Center , Oklahoma City , OK , USA
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An Essential Postdevelopmental Role for Lis1 in Mice. eNeuro 2018; 5:eN-NWR-0350-17. [PMID: 29404402 PMCID: PMC5797476 DOI: 10.1523/eneuro.0350-17.2018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 01/13/2018] [Accepted: 01/17/2018] [Indexed: 12/15/2022] Open
Abstract
LIS1 mutations cause lissencephaly (LIS), a severe developmental brain malformation. Much less is known about its role in the mature nervous system. LIS1 regulates the microtubule motor cytoplasmic dynein 1 (dynein), and as LIS1 and dynein are both expressed in the adult nervous system, Lis1 could potentially regulate dynein-dependent processes such as axonal transport. We therefore knocked out Lis1 in adult mice using tamoxifen-induced, Cre-ER-mediated recombination. When an actin promoter was used to drive Cre-ER expression (Act-Cre-ER), heterozygous Lis1 knockout (KO) caused no obvious change in viability or behavior, despite evidence of widespread recombination by a Cre reporter three weeks after tamoxifen exposure. In contrast, homozygous Lis1 KO caused the rapid onset of neurological symptoms in both male and female mice. One tamoxifen-dosing regimen caused prominent recombination in the midbrain/hindbrain, PNS, and cardiac/skeletal muscle within a week; these mice developed severe symptoms in that time frame and were killed. A different tamoxifen regimen resulted in delayed recombination in midbrain/hindbrain, but not in other tissues, and also delayed the onset of symptoms. This indicates that Lis1 loss in the midbrain/hindbrain causes the severe phenotype. In support of this, brainstem regions known to house cardiorespiratory centers showed signs of axonal dysfunction in KO animals. Transport defects, neurofilament (NF) alterations, and varicosities were observed in axons in cultured DRG neurons from KO animals. Because no symptoms were observed when a cardiac specific Cre-ER promoter was used, we propose a vital role for Lis1 in autonomic neurons and implicate defective axonal transport in the KO phenotype.
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Distal myopathy due to BICD2 mutations. Clin Neurol Neurosurg 2018; 165:47-49. [PMID: 29306765 DOI: 10.1016/j.clineuro.2017.12.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2017] [Revised: 12/25/2017] [Accepted: 12/27/2017] [Indexed: 11/22/2022]
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Banworth MJ, Li G. Consequences of Rab GTPase dysfunction in genetic or acquired human diseases. Small GTPases 2017; 9:158-181. [PMID: 29239692 DOI: 10.1080/21541248.2017.1397833] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Rab GTPases are important regulators of intracellular membrane trafficking in eukaryotes. Both activating and inactivating mutations in Rab genes have been identified and implicated in human diseases ranging from neurological disorders to cancer. In addition, altered Rab expression is often associated with disease prognosis. As such, the study of diseases associated with Rabs or Rab-interacting proteins has shed light on the important role of intracellular membrane trafficking in disease etiology. In this review, we cover recent advances in the field with an emphasis on cellular mechanisms.
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Affiliation(s)
- Marcellus J Banworth
- a Department of Biochemistry and Molecular Biology , University of Oklahoma Health Sciences Center , Oklahoma City , OK , USA
| | - Guangpu Li
- a Department of Biochemistry and Molecular Biology , University of Oklahoma Health Sciences Center , Oklahoma City , OK , USA
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48
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Ahmed AA, Skaria P, Safina NP, Thiffault I, Kats A, Taboada E, Habeebu S, Saunders C. Arthrogryposis and pterygia as lethal end manifestations of genetically defined congenital myopathies. Am J Med Genet A 2017; 176:359-367. [DOI: 10.1002/ajmg.a.38577] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 11/16/2017] [Accepted: 11/17/2017] [Indexed: 12/16/2022]
Affiliation(s)
- Atif A. Ahmed
- Department of PathologyChildren's Mercy HospitalKansas CityMissouri
- University of Missouri‐Kansas City School of MedicineKansas CityMissouri
| | - Priya Skaria
- University of Missouri‐Kansas City School of MedicineKansas CityMissouri
| | - Nicole P. Safina
- University of Missouri‐Kansas City School of MedicineKansas CityMissouri
- Center for Pediatric Genomic MedicineChildren's Mercy HospitalKansas CityMissouri
- Division of Clinical GeneticsChildren's Mercy HospitalKansas CityMissouri
| | - Isabelle Thiffault
- Department of PathologyChildren's Mercy HospitalKansas CityMissouri
- University of Missouri‐Kansas City School of MedicineKansas CityMissouri
- Center for Pediatric Genomic MedicineChildren's Mercy HospitalKansas CityMissouri
| | - Alex Kats
- Department of PathologyChildren's Mercy HospitalKansas CityMissouri
- University of Missouri‐Kansas City School of MedicineKansas CityMissouri
| | - Eugenio Taboada
- Department of PathologyChildren's Mercy HospitalKansas CityMissouri
- University of Missouri‐Kansas City School of MedicineKansas CityMissouri
| | - Sultan Habeebu
- Department of PathologyChildren's Mercy HospitalKansas CityMissouri
- University of Missouri‐Kansas City School of MedicineKansas CityMissouri
| | - Carol Saunders
- Department of PathologyChildren's Mercy HospitalKansas CityMissouri
- University of Missouri‐Kansas City School of MedicineKansas CityMissouri
- Center for Pediatric Genomic MedicineChildren's Mercy HospitalKansas CityMissouri
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Xia B, Li Y, Zhou J, Tian B, Feng L. Identification of potential pathogenic genes associated with osteoporosis. Bone Joint Res 2017; 6:640-648. [PMID: 29203636 PMCID: PMC5935809 DOI: 10.1302/2046-3758.612.bjr-2017-0102.r1] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 08/24/2017] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES Osteoporosis is a chronic disease. The aim of this study was to identify key genes in osteoporosis. METHODS Microarray data sets GSE56815 and GSE56814, comprising 67 osteoporosis blood samples and 62 control blood samples, were obtained from the Gene Expression Omnibus database. Differentially expressed genes (DEGs) were identified in osteoporosis using Limma package (3.2.1) and Meta-MA packages. Gene Ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analyses were performed to identify biological functions. Furthermore, the transcriptional regulatory network was established between the top 20 DEGs and transcriptional factors using the UCSC ENCODE Genome Browser. Receiver operating characteristic (ROC) analysis was applied to investigate the diagnostic value of several DEGs. RESULTS A total of 1320 DEGs were obtained, of which 855 were up-regulated and 465 were down-regulated. These differentially expressed genes were enriched in Gene Ontology terms and Kyoto Encyclopedia of Genes and Genomes pathways, mainly associated with gene expression and osteoclast differentiation. In the transcriptional regulatory network, there were 6038 interactions pairs involving 88 transcriptional factors. In addition, the quantitative reverse transcriptase-polymerase chain reaction result validated the expression of several genes (VPS35, FCGR2A, TBCA, HIRA, TYROBP, and JUND). Finally, ROC analyses showed that VPS35, HIRA, PHF20 and NFKB2 had a significant diagnostic value for osteoporosis. CONCLUSION Genes such as VPS35, FCGR2A, TBCA, HIRA, TYROBP, JUND, PHF20, NFKB2, RPL35A and BICD2 may be considered to be potential pathogenic genes of osteoporosis and may be useful for further study of the mechanisms underlying osteoporosis.Cite this article: B. Xia, Y. Li, J. Zhou, B. Tian, L. Feng. Identification of potential pathogenic genes associated with osteoporosis. Bone Joint Res 2017;6:640-648. DOI: 10.1302/2046-3758.612.BJR-2017-0102.R1.
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Affiliation(s)
- B Xia
- Attending Doctor Department of Orthopedics, Jining No. 1 People's Hospital, 272011 Shandong Province, China
| | - Y Li
- Attending Doctor Department of Orthopedics, Jining No. 1 People's Hospital, 272011 Shandong Province, China
| | - J Zhou
- Attending Doctor Department of Gynecology, Jining No. 1 People's Hospital, 272011 Shandong Province, China
| | - B Tian
- Attending Doctor Department of Orthopedics, Jining No. 1 People's Hospital, 272011 Shandong Province, China
| | - L Feng
- Attending Doctor Department of Orthopedics, Jining No. 1 People's Hospital, 272011 Shandong Province, China
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Genome-wide linkage and association study implicates the 10q26 region as a major genetic contributor to primary nonsyndromic vesicoureteric reflux. Sci Rep 2017; 7:14595. [PMID: 29097723 PMCID: PMC5668427 DOI: 10.1038/s41598-017-15062-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 10/06/2017] [Indexed: 12/29/2022] Open
Abstract
Vesicoureteric reflux (VUR) is the commonest urological anomaly in children. Despite treatment improvements, associated renal lesions – congenital dysplasia, acquired scarring or both – are a common cause of childhood hypertension and renal failure. Primary VUR is familial, with transmission rate and sibling risk both approaching 50%, and appears highly genetically heterogeneous. It is often associated with other developmental anomalies of the urinary tract, emphasising its etiology as a disorder of urogenital tract development. We conducted a genome-wide linkage and association study in three European populations to search for loci predisposing to VUR. Family-based association analysis of 1098 parent-affected-child trios and case/control association analysis of 1147 cases and 3789 controls did not reveal any compelling associations, but parametric linkage analysis of 460 families (1062 affected individuals) under a dominant model identified a single region, on 10q26, that showed strong linkage (HLOD = 4.90; ZLRLOD = 4.39) to VUR. The ~9Mb region contains 69 genes, including some good biological candidates. Resequencing this region in selected individuals did not clearly implicate any gene but FOXI2, FANK1 and GLRX3 remain candidates for further investigation. This, the largest genetic study of VUR to date, highlights the 10q26 region as a major genetic contributor to VUR in European populations.
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