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Yang H, Tian Z. Analysis of mutation-originated gain-of-glycosylation using mass spectrometry-based N-glycoproteomics. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2024; 38:e9838. [PMID: 38924612 DOI: 10.1002/rcm.9838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 05/22/2024] [Accepted: 05/26/2024] [Indexed: 06/28/2024]
Abstract
RATIONALE A general N-glycoproteomics analysis pipeline has been established for characterization of mutation-related gain-of-glycosylation (GoG) at intact N-glycopeptide molecular level, generating comprehensive site and structure information of N-glycosylation. METHODS This study focused on mutation-originated GoG using a mass spectrometry-based N-glycoproteomics analysis workflow. In brief, GoG intact N-glycopeptide databases were built, consisting of 2701 proteins (potential GoG N-glycosites and amino acids derived from MUTAGEN, VARIANT and VAR_SEQ in UniProt) and 6709 human N-glycans (≤50 sequence isomers per monosaccharide composition). We employed the site- and structure-specific N-glycoproteomics workflow utilizing intact N-glycopeptides search engine GPSeeker to identify GoG intact N-glycopeptides from parental breast cancer stem cells (MCF-7 CSCs) and adriamycin-resistant breast cancer stem cells (MCF-7/ADR CSCs). RESULTS With the criteria of spectrum-level false discovery rate control of ≤1%, we identified 87 and 94 GoG intact N-glycopeptides corresponding to 37 and 35 intact N-glycoproteins from MCF-7 CSCs and MCF-7/ADR CSCs, respectively. Micro-heterogeneity and macro-heterogeneity of N-glycosylation from GoG intact N-glycoproteins with VAR_SEQ and VARIANT were found in both MCF-7 CSCs and MCF-7/ADR CSCs systems. CONCLUSIONS The integration of site- and structure-specific N-glycoproteomics approach, conjugating with GoG characterization, provides a universal workflow for revealing comprehensive N-glycosite and N-glycan structure information of GoG. The analysis of mutation-originated GoG can be extended to GoG characterization of other N-glycoproteome systems including complex clinical tissues and body fluids.
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Affiliation(s)
- Hailun Yang
- School of Chemical Science & Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai, China
| | - Zhixin Tian
- School of Chemical Science & Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai, China
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Qiu T, Hou L, Zhao L, Wang X, Zhou Z, Yang C, Zhang H, Jiang D, Jiao B, Chen C. SGCE promotes breast cancer stemness by promoting the transcription of FGF-BP1 by Sp1. J Biol Chem 2023; 299:105351. [PMID: 37838174 PMCID: PMC10641673 DOI: 10.1016/j.jbc.2023.105351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 09/13/2023] [Accepted: 09/18/2023] [Indexed: 10/16/2023] Open
Abstract
Breast cancer stem cells are mainly responsible for poor prognosis, especially in triple-negative breast cancer (TNBC). In a previous study, we demonstrated that ε-Sarcoglycan (SGCE), a type Ⅰ single-transmembrane protein, is a potential oncogene that promotes TNBC stemness by stabilizing EGFR. Here, we further found that SGCE depletion reduces breast cancer stem cells, partially through inhibiting the transcription of FGF-BP1, a secreted oncoprotein. Mechanistically, we demonstrate that SGCE could interact with the specific protein 1 transcription factor and translocate into the nucleus, which leads to an increase in the transcription of FGF-BP1, and the secreted FBF-BP1 activates FGF-FGFR signaling to promote cancer cell stemness. The novel SGCE-Sp1-FGF-BP1 axis provides novel potential candidate diagnostic markers and therapeutic targets for TNBC.
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Affiliation(s)
- Ting Qiu
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Kunming, Yunnan, China; Kunming College of Life sciences, University of Chinese Academy Sciences, Kunming, Yunnan, China
| | - Lei Hou
- Department of Breast Disease, Henan Breast Cancer Center, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, China
| | - Lina Zhao
- Kunming College of Life sciences, University of Chinese Academy Sciences, Kunming, Yunnan, China; State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
| | - Xinye Wang
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Kunming, Yunnan, China
| | - Zhongmei Zhou
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Kunming, Yunnan, China
| | - Chuanyu Yang
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Kunming, Yunnan, China
| | - Huifeng Zhang
- Department of Clinical Pharmacy, The First People's Hospital of Yunnan Province/The Affiliated Hospital of Kunming University of Science and Technology, Kunming, China
| | - Dewei Jiang
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Kunming, Yunnan, China; Kunming College of Life sciences, University of Chinese Academy Sciences, Kunming, Yunnan, China.
| | - Baowei Jiao
- Department of Breast Disease, Henan Breast Cancer Center, Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital, Zhengzhou, China.
| | - Ceshi Chen
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Kunming, Yunnan, China; Academy of Biomedical Engineering, Kunming Medical University, Kunming, China; The Third Affiliated Hospital, Kunming Medical University, Kunming, China.
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Camponeschi C, Righino B, Pirolli D, Semeraro A, Ria F, De Rosa MC. Prediction of CD44 Structure by Deep Learning-Based Protein Modeling. Biomolecules 2023; 13:1047. [PMID: 37509083 PMCID: PMC10376988 DOI: 10.3390/biom13071047] [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: 05/29/2023] [Revised: 06/19/2023] [Accepted: 06/24/2023] [Indexed: 07/30/2023] Open
Abstract
CD44 is a cell surface glycoprotein transmembrane receptor that is involved in cell-cell and cell-matrix interactions. It crucially associates with several molecules composing the extracellular matrix, the main one of which is hyaluronic acid. It is ubiquitously expressed in various types of cells and is involved in the regulation of important signaling pathways, thus playing a key role in several physiological and pathological processes. Structural information about CD44 is, therefore, fundamental for understanding the mechanism of action of this receptor and developing effective treatments against its aberrant expression and dysregulation frequently associated with pathological conditions. To date, only the structure of the hyaluronan-binding domain (HABD) of CD44 has been experimentally determined. To elucidate the nature of CD44s, the most frequently expressed isoform, we employed the recently developed deep-learning-based tools D-I-TASSER, AlphaFold2, and RoseTTAFold for an initial structural prediction of the full-length receptor, accompanied by molecular dynamics simulations on the most promising model. All three approaches correctly predicted the HABD, with AlphaFold2 outperforming D-I-TASSER and RoseTTAFold in the structural comparison with the crystallographic HABD structure and confidence in predicting the transmembrane helix. Low confidence regions were also predicted, which largely corresponded to the disordered regions of CD44s. These regions allow the receptor to perform its unconventional activity.
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Affiliation(s)
- Chiara Camponeschi
- Institute of Chemical Sciences and Technologies ''Giulio Natta'' (SCITEC)-CNR, 00168 Rome, Italy
| | - Benedetta Righino
- Institute of Chemical Sciences and Technologies ''Giulio Natta'' (SCITEC)-CNR, 00168 Rome, Italy
| | - Davide Pirolli
- Institute of Chemical Sciences and Technologies ''Giulio Natta'' (SCITEC)-CNR, 00168 Rome, Italy
| | - Alessandro Semeraro
- Department of Chemistry and Technology of Drugs, Sapienza University of Rome, 00185 Rome, Italy
| | - Francesco Ria
- Department of Translational Medicine and Surgery, Section of General Pathology, Università Cattolica del Sacro Cuore, 00168 Rome, Italy
- Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy
| | - Maria Cristina De Rosa
- Institute of Chemical Sciences and Technologies ''Giulio Natta'' (SCITEC)-CNR, 00168 Rome, Italy
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Cazurro-Gutiérrez A, Marcé-Grau A, Correa-Vela M, Salazar A, Vanegas MI, Macaya A, Bayés À, Pérez-Dueñas B. ε-Sarcoglycan: Unraveling the Myoclonus-Dystonia Gene. Mol Neurobiol 2021; 58:3938-3952. [PMID: 33886091 DOI: 10.1007/s12035-021-02391-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 04/08/2021] [Indexed: 01/23/2023]
Abstract
Myoclonus-dystonia (MD) is a rare childhood-onset movement disorder, with an estimated prevalence of about 2 per 1,000,.000 in Europe, characterized by myoclonic jerks in combination with focal or segmental dystonia. Pathogenic variants in the gene encoding ε-sarcoglycan (SGCE), a maternally imprinted gene, are the most frequent genetic cause of MD. To date, the exact role of ε-sarcoglycan and the pathogenic mechanisms that lead to MD are still unknown. However, there are more than 40 reported isoforms of human ε-sarcoglycan, pointing to a complex biology of this protein. Additionally, some of these are brain-specific isoforms, which may suggest an important role within the central nervous system. In the present review, we aim to provide an overview of the current state of knowledge of ε-sarcoglycan. We will focus on the genetic landscape of SGCE and the presence and plausible role of ε-sarcoglycan in the brain. Finally, we discuss the importance of the brain-specific isoforms and hypothesize that SGCE may play essential roles in normal synaptic functioning and their alteration will be strongly related to MD.
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Affiliation(s)
- Ana Cazurro-Gutiérrez
- Paediatric Neurology Research Group, Hospital Vall d'Hebrón, Universitat Autònoma de Barcelona, Vall d'Hebrón Research Institute, Barcelona, Spain
- Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Anna Marcé-Grau
- Paediatric Neurology Research Group, Hospital Vall d'Hebrón, Universitat Autònoma de Barcelona, Vall d'Hebrón Research Institute, Barcelona, Spain
| | - Marta Correa-Vela
- Paediatric Neurology Research Group, Hospital Vall d'Hebrón, Universitat Autònoma de Barcelona, Vall d'Hebrón Research Institute, Barcelona, Spain
- Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Ainara Salazar
- Paediatric Neurology Research Group, Hospital Vall d'Hebrón, Universitat Autònoma de Barcelona, Vall d'Hebrón Research Institute, Barcelona, Spain
- Paediatric Neurology Department, Hospital Vall d'Hebron, Barcelona, Spain
| | - María I Vanegas
- Paediatric Neurology Research Group, Hospital Vall d'Hebrón, Universitat Autònoma de Barcelona, Vall d'Hebrón Research Institute, Barcelona, Spain
- Universitat de Barcelona, Barcelona, Spain
| | - Alfons Macaya
- Paediatric Neurology Research Group, Hospital Vall d'Hebrón, Universitat Autònoma de Barcelona, Vall d'Hebrón Research Institute, Barcelona, Spain
- Universitat Autònoma de Barcelona, Barcelona, Spain
- Paediatric Neurology Department, Hospital Vall d'Hebron, Barcelona, Spain
| | - Àlex Bayés
- Universitat Autònoma de Barcelona, Barcelona, Spain
- Molecular Physiology of the Synapse Laboratory, Biomedical Research Institute Sant Pau, Barcelona, Spain
| | - Belén Pérez-Dueñas
- Paediatric Neurology Research Group, Hospital Vall d'Hebrón, Universitat Autònoma de Barcelona, Vall d'Hebrón Research Institute, Barcelona, Spain.
- Universitat Autònoma de Barcelona, Barcelona, Spain.
- Paediatric Neurology Department, Hospital Vall d'Hebron, Barcelona, Spain.
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Mutation screening of VPS16 gene in patients with isolated dystonia. Parkinsonism Relat Disord 2021; 83:63-65. [DOI: 10.1016/j.parkreldis.2020.12.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Revised: 12/22/2020] [Accepted: 12/27/2020] [Indexed: 11/30/2022]
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Li J, Liu Y, Li Q, Huang X, Zhou D, Xu H, Zhao F, Mi X, Wang R, Jia F, Xu F, Yang J, Liu D, Deng X, Zhang Y. Mutation in ε-Sarcoglycan Induces a Myoclonus-Dystonia Syndrome-Like Movement Disorder in Mice. Neurosci Bull 2020; 37:311-322. [PMID: 33355901 DOI: 10.1007/s12264-020-00612-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 06/09/2020] [Indexed: 10/22/2022] Open
Abstract
Myoclonus dystonia syndrome (MDS) is an inherited movement disorder, and most MDS-related mutations have so far been found in the ε-sarcoglycan (SGCE) coding gene. By generating SGCE-knockout (KO) and human 237 C > T mutation knock-in (KI) mice, we showed here that both KO and KI mice exerted typical movement defects similar to those of MDS patients. SGCE promoted filopodia development in vitro and inhibited excitatory synapse formation both in vivo and in vitro. Loss of function of SGCE leading to excessive excitatory synapses that may ultimately contribute to MDS pathology. Indeed, using a zebrafish MDS model, we found that among 1700 screened chemical compounds, Vigabatrin was the most potent in readily reversing MDS symptoms of mouse disease models. Our study strengthens the notion that mutations of SGCE lead to MDS and most likely, SGCE functions to brake synaptogenesis in the CNS.
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Affiliation(s)
- Jiao Li
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Yiqiong Liu
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Qin Li
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Xiaolin Huang
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Dingxi Zhou
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Hanjian Xu
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Feng Zhao
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Xiaoxiao Mi
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Ruoxu Wang
- College of Life Sciences, Wuhan University, Wuhan, 430027, China
| | - Fan Jia
- Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Fuqiang Xu
- Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Jing Yang
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Dong Liu
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China
| | - Xuliang Deng
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China.
| | - Yan Zhang
- State Key Laboratory of Membrane Biology, College of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Peking University, Beijing, 100871, China.
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Molecular mechanisms of missense mutations that generate ectopic N-glycosylation sites in coagulation factor VIII. Biochem J 2018; 475:873-886. [PMID: 29444815 DOI: 10.1042/bcj20170884] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 02/07/2018] [Accepted: 02/14/2018] [Indexed: 11/17/2022]
Abstract
N-glycosylation is a common posttranslational modification of secreted and membrane proteins, catalyzed by the two enzymatic isoforms of the oligosaccharyltransferase, STT3A and STT3B. Missense mutations are the most common mutations in inherited diseases; however, missense mutations that generate extra, non-native N-glycosylation sites have not been well characterized. Coagulation factor VIII (FVIII) contains five consensus N-glycosylation sites outside its functionally dispensable B domain. We developed a computer program that identified hemophilia A mutations in FVIII that can potentially create ectopic glycosylation sites. We determined that 18 of these ectopic sites indeed become N-glycosylated. These sites span the domains of FVIII and are primarily associated with a severe disease phenotype. Using STT3A and STT3B knockout cells, we determined that ectopic glycosylation exhibited different degrees of dependence on STT3A and STT3B. By separating the effects of ectopic N-glycosylation from those due to underlying amino acid changes, we showed that ectopic glycans promote the secretion of some mutants, but impair the secretion of others. However, ectopic glycans that enhanced secretion could not functionally replace a native N-glycan in the same domain. Secretion-deficient mutants, but not mutants with elevated secretion levels, show increased association with the endoplasmic reticulum chaperones BiP (immunoglobulin heavy chain-binding protein) and calreticulin. Though secreted to different extents, all studied mutants exhibited lower relative activity than wild-type FVIII. Our results reveal differential impacts of ectopic N-glycosylation on FVIII folding, trafficking and activity, which highlight complex disease-causing mechanisms of FVIII missense mutations. Our findings are relevant to other secreted and membrane proteins with mutations that generate ectopic N-glycans.
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Grütz K, Seibler P, Weissbach A, Lohmann K, Carlisle FA, Blake DJ, Westenberger A, Klein C, Grünewald A. Faithful SGCE imprinting in iPSC-derived cortical neurons: an endogenous cellular model of myoclonus-dystonia. Sci Rep 2017; 7:41156. [PMID: 28155872 PMCID: PMC5290732 DOI: 10.1038/srep41156] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 12/14/2016] [Indexed: 02/07/2023] Open
Abstract
In neuropathology research, induced pluripotent stem cell (iPSC)-derived neurons are considered a tool closely resembling the patient brain. Albeit in respect to epigenetics, this concept has been challenged. We generated iPSC-derived cortical neurons from myoclonus-dystonia patients with mutations (W100G and R102X) in the maternally imprinted ε-sarcoglycan (SGCE) gene and analysed properties such as imprinting, mRNA and protein expression. Comparison of the promoter during reprogramming and differentiation showed tissue-independent differential methylation. DNA sequencing with methylation-specific primers and cDNA analysis in patient neurons indicated selective expression of the mutated paternal SGCE allele. While fibroblasts only expressed the ubiquitous mRNA isoform, brain-specific SGCE mRNA and ε-sarcoglycan protein were detected in iPSC-derived control neurons. However, neuronal protein levels were reduced in both mutants. Our phenotypic characterization highlights the suitability of iPSC-derived cortical neurons with SGCE mutations for myoclonus-dystonia research and, in more general terms, prompts the use of iPSC-derived cellular models to study epigenetic mechanisms impacting on health and disease.
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Affiliation(s)
- Karen Grütz
- Institute of Neurogenetics, University of Lübeck, 23562 Lübeck, Germany
| | - Philip Seibler
- Institute of Neurogenetics, University of Lübeck, 23562 Lübeck, Germany
| | - Anne Weissbach
- Institute of Neurogenetics, University of Lübeck, 23562 Lübeck, Germany
| | - Katja Lohmann
- Institute of Neurogenetics, University of Lübeck, 23562 Lübeck, Germany
| | - Francesca A Carlisle
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff CF24 4HQ, United Kingdom
| | - Derek J Blake
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, School of Medicine, Cardiff University, Cardiff CF24 4HQ, United Kingdom
| | - Ana Westenberger
- Institute of Neurogenetics, University of Lübeck, 23562 Lübeck, Germany
| | - Christine Klein
- Institute of Neurogenetics, University of Lübeck, 23562 Lübeck, Germany
| | - Anne Grünewald
- Institute of Neurogenetics, University of Lübeck, 23562 Lübeck, Germany.,Molecular and Functional Neurobiology Group, Luxembourg Centre for Systems Biomedicine, University of Luxembourg, L-4367 Belvaux, Luxembourg
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Waite AJ, Carlisle FA, Chan YM, Blake DJ. Myoclonus dystonia and muscular dystrophy: ɛ-sarcoglycan is part of the dystrophin-associated protein complex in brain. Mov Disord 2016; 31:1694-1703. [PMID: 27535350 PMCID: PMC5129563 DOI: 10.1002/mds.26738] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 05/24/2016] [Accepted: 06/27/2016] [Indexed: 11/17/2022] Open
Abstract
Background Myoclonus‐dystonia is a neurogenic movement disorder caused by mutations in the gene encoding ɛ‐sarcoglycan. By contrast, mutations in the α‐, β‐, γ‐, and δ‐sarcoglycan genes cause limb girdle muscular dystrophies. The sarcoglycans are part of the dystrophin‐associated protein complex in muscle that is disrupted in several types of muscular dystrophy. Intriguingly, patients with myoclonus‐dystonia have no muscle pathology; conversely, limb‐girdle muscular dystrophy patients have not been reported to have dystonia‐associated features. To gain further insight into the molecular mechanisms underlying these differences, we searched for evidence of a sarcoglycan complex in the brain. Methods Immunoaffinity chromatography and mass spectrometry were used to purify ubiquitous and brain‐specific ɛ‐sarcoglycan directly from tissue. Cell models were used to determine the effect of mutations on the trafficking and assembly of the brain sarcoglycan complex. Results Ubiquitous and brain‐specific ɛ‐sarcoglycan isoforms copurify with β‐, δ‐, and ζ‐sarcoglycan, β‐dystroglycan, and dystrophin Dp71 from brain. Incorporation of a muscular dystrophy‐associated β‐sarcoglycan mutant into the brain sarcoglycan complex impairs the formation of the βδ‐sarcoglycan core but fails to abrogate the association and membrane trafficking of ɛ‐ and ζ‐sarcoglycan. Conclusions ɛ‐Sarcoglycan is part of the dystrophin‐associated protein complex in brain. Partial preservation of ɛ‐ and ζ‐sarcoglycan in brain may explain the absence of myoclonus dystonia‐like features in muscular dystrophy patients. © 2016 The Authors. Movement Disorders published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Adrian J. Waite
- Division of Psychological Medicine and Clinical NeurosciencesMRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff UniversityCardiffUnited Kingdom
| | - Francesca A. Carlisle
- Division of Psychological Medicine and Clinical NeurosciencesMRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff UniversityCardiffUnited Kingdom
| | - Yiumo Michael Chan
- McColl‐Lockwood Laboratory for Muscular Dystrophy ResearchCarolinas Medical CenterCharlotteNorth CarolinaUSA
| | - Derek J. Blake
- Division of Psychological Medicine and Clinical NeurosciencesMRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff UniversityCardiffUnited Kingdom
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Campbell MD, Witcher M, Gopal A, Michele DE. Dilated cardiomyopathy mutations in δ-sarcoglycan exert a dominant-negative effect on cardiac myocyte mechanical stability. Am J Physiol Heart Circ Physiol 2016; 310:H1140-50. [PMID: 26968544 PMCID: PMC4867387 DOI: 10.1152/ajpheart.00521.2015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 03/07/2016] [Indexed: 01/25/2023]
Abstract
Delta-sarcoglycan is a component of the sarcoglycan subcomplex within the dystrophin-glycoprotein complex located at the plasma membrane of muscle cells. While recessive mutations in δ-sarcoglycan cause limb girdle muscular dystrophy 2F, dominant mutations in δ-sarcoglycan have been linked to inherited dilated cardiomyopathy (DCM). The purpose of this study was to investigate functional cellular defects present in adult cardiac myocytes expressing mutant δ-sarcoglycans harboring the dominant inherited DCM mutations R71T or R97Q. This study demonstrates that DCM mutant δ-sarcoglycans can be stably expressed in adult rat cardiac myocytes and traffic similarly to wild-type δ-sarcoglycan to the plasma membrane, without perturbing assembly of the dystrophin-glycoprotein complex. However, expression of DCM mutant δ-sarcoglycan in adult rat cardiac myocytes is sufficient to alter cardiac myocyte plasma membrane stability in the presence of mechanical strain. Upon cyclical cell stretching, cardiac myocytes expressing mutant δ-sarcoglycan R97Q or R71T have increased cell-impermeant dye uptake and undergo contractures at greater frequencies than myocytes expressing normal δ-sarcoglycan. Additionally, the R71T mutation creates an ectopic N-linked glycosylation site that results in aberrant glycosylation of the extracellular domain of δ-sarcoglycan. Therefore, appropriate glycosylation of δ-sarcoglycan may also be necessary for proper δ-sarcoglycan function and overall dystrophin-glycoprotein complex function. These studies demonstrate that DCM mutations in δ-sarcoglycan can exert a dominant negative effect on dystrophin-glycoprotein complex function leading to myocardial mechanical instability that may underlie the pathogenesis of δ-sarcoglycan-associated DCM.
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Affiliation(s)
- Matthew D Campbell
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan; and
| | - Marc Witcher
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan; and
| | - Anoop Gopal
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan; and
| | - Daniel E Michele
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan; and Department of Internal Medicine, Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, Michigan
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Cerebellar synaptogenesis is compromised in mouse models of DYT1 dystonia. Exp Neurol 2015; 271:457-67. [DOI: 10.1016/j.expneurol.2015.07.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 07/01/2015] [Accepted: 07/07/2015] [Indexed: 12/16/2022]
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Pirolli D, Sciandra F, Bozzi M, Giardina B, Brancaccio A, De Rosa MC. Insights from molecular dynamics simulations: structural basis for the V567D mutation-induced instability of zebrafish alpha-dystroglycan and comparison with the murine model. PLoS One 2014; 9:e103866. [PMID: 25078606 PMCID: PMC4117597 DOI: 10.1371/journal.pone.0103866] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Accepted: 07/03/2014] [Indexed: 11/19/2022] Open
Abstract
A missense amino acid mutation of valine to aspartic acid in 567 position of alpha-dystroglycan (DG), identified in dag1-mutated zebrafish, results in a reduced transcription and a complete absence of the protein. Lacking experimental structural data for zebrafish DG domains, the detailed mechanism for the observed mutation-induced destabilization of the DG complex and membrane damage, remained unclear. With the aim to contribute to a better clarification of the structure-function relationships featuring the DG complex, three-dimensional structural models of wild-type and mutant (V567D) C-terminal domain of alpha-DG from zebrafish were constructed by a template-based modelling approach. We then ran extensive molecular dynamics (MD) simulations to reveal the structural and dynamic properties of the C-terminal domain and to evaluate the effect of the single mutation on alpha-DG stability. A comparative study has been also carried out on our previously generated model of murine alpha-DG C-terminal domain including the I591D mutation, which is topologically equivalent to the V567D mutation found in zebrafish. Trajectories from MD simulations were analyzed in detail, revealing extensive structural disorder involving multiple beta-strands in the mutated variant of the zebrafish protein whereas local effects have been detected in the murine protein. A biochemical analysis of the murine alpha-DG mutant I591D confirmed a pronounced instability of the protein. Taken together, the computational and biochemical analysis suggest that the V567D/I591D mutation, belonging to the G beta-strand, plays a key role in inducing a destabilization of the alpha-DG C-terminal Ig-like domain that could possibly affect and propagate to the entire DG complex. The structural features herein identified may be of crucial help to understand the molecular basis of primary dystroglycanopathies.
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Affiliation(s)
- Davide Pirolli
- Istituto di Biochimica e Biochimica Clinica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Francesca Sciandra
- Istituto di Chimica del Riconoscimento Molecolare (ICRM) - CNR c/o Università Cattolica del Sacro Cuore, Rome, Italy
| | - Manuela Bozzi
- Istituto di Biochimica e Biochimica Clinica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Bruno Giardina
- Istituto di Biochimica e Biochimica Clinica, Università Cattolica del Sacro Cuore, Rome, Italy
- Istituto di Chimica del Riconoscimento Molecolare (ICRM) - CNR c/o Università Cattolica del Sacro Cuore, Rome, Italy
| | - Andrea Brancaccio
- Istituto di Chimica del Riconoscimento Molecolare (ICRM) - CNR c/o Università Cattolica del Sacro Cuore, Rome, Italy
| | - Maria Cristina De Rosa
- Istituto di Chimica del Riconoscimento Molecolare (ICRM) - CNR c/o Università Cattolica del Sacro Cuore, Rome, Italy
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SGCZ mutations are unlikely to be associated with myoclonus dystonia. Neuroscience 2014; 272:88-91. [PMID: 24792710 DOI: 10.1016/j.neuroscience.2014.04.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Revised: 04/19/2014] [Accepted: 04/21/2014] [Indexed: 12/25/2022]
Abstract
BACKGROUND Myoclonus dystonia syndrome (MDS) is a hyperkinetic movement disorder caused, in a proportion of cases, by mutations of the maternally imprinted epsilon-sarcoglycan gene (SGCE). SGCE mutation rates vary between cohorts, suggesting genetic heterogeneity. E- and ζ-sarcoglycan are both expressed in brain tissue. In this study we tested whether zeta-sarcoglycan gene (SGCZ) mutations also contribute to this disorder. METHODS Patients with clinically suspected MDS and no SGCE mutation were recruited and classified, according to previously published criteria, as to their likelihood of the movement disorder. All SGCZ exons and intron/exon boundaries were screened by direct sequencing. RESULTS Fifty-four SGCE mutation-negative patients were recruited from the UK and the Netherlands. Subdivided according to the likelihood of the movement disorder resulted in 17 'definite', 16 'probable' and 21 'possible' cases. No pathogenic SGCZ mutations were identified. CONCLUSIONS SGCZ mutations are unlikely to contribute to the genetic heterogeneity in MDS.
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Knockdown of human TCF4 affects multiple signaling pathways involved in cell survival, epithelial to mesenchymal transition and neuronal differentiation. PLoS One 2013; 8:e73169. [PMID: 24058414 PMCID: PMC3751932 DOI: 10.1371/journal.pone.0073169] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2013] [Accepted: 07/18/2013] [Indexed: 01/04/2023] Open
Abstract
Haploinsufficiency of TCF4 causes Pitt-Hopkins syndrome (PTHS): a severe form of mental retardation with phenotypic similarities to Angelman, Mowat-Wilson and Rett syndromes. Genome-wide association studies have also found that common variants in TCF4 are associated with an increased risk of schizophrenia. Although TCF4 is transcription factor, little is known about TCF4-regulated processes in the brain. In this study we used genome-wide expression profiling to determine the effects of acute TCF4 knockdown on gene expression in SH-SY5Y neuroblastoma cells. We identified 1204 gene expression changes (494 upregulated, 710 downregulated) in TCF4 knockdown cells. Pathway and enrichment analysis on the differentially expressed genes in TCF4-knockdown cells identified an over-representation of genes involved in TGF-β signaling, epithelial to mesenchymal transition (EMT) and apoptosis. Among the most significantly differentially expressed genes were the EMT regulators, SNAI2 and DEC1 and the proneural genes, NEUROG2 and ASCL1. Altered expression of several mental retardation genes such as UBE3A (Angelman Syndrome), ZEB2 (Mowat-Wilson Syndrome) and MEF2C was also found in TCF4-depleted cells. These data suggest that TCF4 regulates a number of convergent signaling pathways involved in cell differentiation and survival in addition to a subset of clinically important mental retardation genes.
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Casper C, Kalliolia E, Warner TT. Recent advances in the molecular pathogenesis of dystonia-plus syndromes and heredodegenerative dystonias. Curr Neuropharmacol 2013; 11:30-40. [PMID: 23814535 PMCID: PMC3580789 DOI: 10.2174/157015913804999432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Revised: 08/17/2012] [Accepted: 08/29/2012] [Indexed: 12/04/2022] Open
Abstract
The majority of studies investigating the molecular pathogenesis and cell biology underlying dystonia have been performed in individuals with primary dystonia. This includes monogenic forms such as DYT1and DYT6 dystonia, and primary focal dystonia which is likely to be multifactorial in origin. In recent years there has been renewed interest in non-primary forms of dystonia including the dystonia-plus syndromes and heredodegenerative disorders. These are caused by a variety of genetic mutations and their study has contributed to our understanding of the neuronal dysfunction that leads to dystonia These findings have reinforced themes identified from study of primary dystonia including abnormal dopaminergic signalling, cellular trafficking and mitochondrial function. In this review we highlight recent advances in the understanding of the dystonia-plus syndromes and heredodegenerative dystonias.
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Affiliation(s)
- Catharina Casper
- Department of Clinical Neurosciences, UCL Institute of Neurology, Royal Free Campus, Rowland Hill Street, London NW3 2PF, United Kingdom
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17
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The dystrophin–glycoprotein complex in brain development and disease. Trends Neurosci 2012; 35:487-96. [DOI: 10.1016/j.tins.2012.04.004] [Citation(s) in RCA: 139] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 04/03/2012] [Accepted: 04/15/2012] [Indexed: 11/23/2022]
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18
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Computational investigation of pathogenic nsSNPs in CEP63 protein. Gene 2012; 503:75-82. [DOI: 10.1016/j.gene.2012.04.032] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 04/01/2012] [Accepted: 04/11/2012] [Indexed: 12/11/2022]
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Mazumder R, Morampudi KS, Motwani M, Vasudevan S, Goldman R. Proteome-wide analysis of single-nucleotide variations in the N-glycosylation sequon of human genes. PLoS One 2012; 7:e36212. [PMID: 22586465 PMCID: PMC3346765 DOI: 10.1371/journal.pone.0036212] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Accepted: 03/28/2012] [Indexed: 11/22/2022] Open
Abstract
N-linked glycosylation is one of the most frequent post-translational modifications of proteins with a profound impact on their biological function. Besides other functions, N-linked glycosylation assists in protein folding, determines protein orientation at the cell surface, or protects proteins from proteases. The N-linked glycans attach to asparagines in the sequence context Asn-X-Ser/Thr, where X is any amino acid except proline. Any variation (e.g. non-synonymous single nucleotide polymorphism or mutation) that abolishes the N-glycosylation sequence motif will lead to the loss of a glycosylation site. On the other hand, variations causing a substitution that creates a new N-glycosylation sequence motif can result in the gain of glycosylation. Although the general importance of glycosylation is well known and acknowledged, the effect of variation on the actual glycoproteome of an organism is still mostly unknown. In this study, we focus on a comprehensive analysis of non-synonymous single nucleotide variations (nsSNV) that lead to either loss or gain of the N-glycosylation motif. We find that 1091 proteins have modified N-glycosylation sequons due to nsSNVs in the genome. Based on analysis of proteins that have a solved 3D structure at the site of variation, we find that 48% of the variations that lead to changes in glycosylation sites occur at the loop and bend regions of the proteins. Pathway and function enrichment analysis show that a significant number of proteins that gained or lost the glycosylation motif are involved in kinase activity, immune response, and blood coagulation. A structure-function analysis of a blood coagulation protein, antithrombin III and a protease, cathepsin D, showcases how a comprehensive study followed by structural analysis can help better understand the functional impact of the nsSNVs.
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Affiliation(s)
- Raja Mazumder
- Department of Biochemistry and Molecular Biology, George Washington University Medical Center, Washington, DC, USA.
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