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Aabdien A, Sichlinger L, Borgel Z, Jones MR, Waston IA, Gatford NJF, Raval P, Tanangonan L, Powell TR, Duarte RRR, Srivastava DP. Schizophrenia risk proteins ZNF804A and NT5C2 interact in cortical neurons. Eur J Neurosci 2024; 59:2102-2117. [PMID: 38279611 DOI: 10.1111/ejn.16254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 12/13/2023] [Accepted: 01/03/2024] [Indexed: 01/28/2024]
Abstract
The zinc finger protein 804A (ZNF804A) and the 5'-nucleotidase cytosolic II (NT5C2) genes are amongst the first schizophrenia susceptibility genes to have been identified in large-scale genome-wide association studies. ZNF804A has been implicated in the regulation of neuronal morphology and is required for activity-dependent changes to dendritic spines. Conversely, NT5C2 has been shown to regulate 5' adenosine monophosphate-activated protein kinase activity and has been implicated in protein synthesis in human neural progenitor cells. Schizophrenia risk genotype is associated with reduced levels of both NT5C2 and ZNF804A in the developing brain, and a yeast two-hybrid screening suggests that their encoded proteins physically interact. However, it remains unknown whether this interaction also occurs in cortical neurons and whether they could jointly regulate neuronal function. Here, we show that ZNF804A and NT5C2 colocalise and interact in HEK293T cells and that their rodent homologues, ZFP804A and NT5C2, colocalise and form a protein complex in cortical neurons. Knockdown of the Zfp804a or Nt5c2 genes resulted in a redistribution of both proteins, suggesting that both proteins influence the subcellular targeting of each other. The identified interaction between ZNF804A/ZFP804A and NT5C2 suggests a shared biological pathway pertinent to schizophrenia susceptibility within a neuronal cell type thought to be central to the neurobiology of the disorder, providing a better understanding of its genetic landscape.
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Affiliation(s)
- Afra Aabdien
- Department of Basic and Clinical Neuroscience, The Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Laura Sichlinger
- Department of Basic and Clinical Neuroscience, The Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Zoe Borgel
- Department of Basic and Clinical Neuroscience, The Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Madeleine R Jones
- Department of Basic and Clinical Neuroscience, The Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Iain A Waston
- Department of Basic and Clinical Neuroscience, The Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Nicholas J F Gatford
- Department of Basic and Clinical Neuroscience, The Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Pooja Raval
- Department of Basic and Clinical Neuroscience, The Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Lloyd Tanangonan
- Department of Basic and Clinical Neuroscience, The Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Timothy R Powell
- Social, Genetic & Developmental Psychiatry Centre, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Rodrigo R R Duarte
- Social, Genetic & Developmental Psychiatry Centre, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Deepak P Srivastava
- Department of Basic and Clinical Neuroscience, The Maurice Wohl Clinical Neuroscience Institute, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
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2
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Pesi R, Allegrini S, Balestri F, Garcia-Gil M, Cividini F, Colombaioni L, Jordheim LP, Camici M, Tozzi MG. Cytosolic 5'-Nucleotidase II Is a Sensor of Energy Charge and Oxidative Stress: A Possible Function as Metabolic Regulator. Cells 2021; 10:182. [PMID: 33477638 DOI: 10.3390/cells10010182] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 01/08/2021] [Accepted: 01/15/2021] [Indexed: 12/20/2022] Open
Abstract
Cytosolic 5'-nucleotidase II (NT5C2) is a highly regulated enzyme involved in the maintenance of intracellular purine and the pyrimidine compound pool. It dephosphorylates mainly IMP and GMP but is also active on AMP. This enzyme is highly expressed in tumors, and its activity correlates with a high rate of proliferation. In this paper, we show that the recombinant purified NT5C2, in the presence of a physiological concentration of the inhibitor inorganic phosphate, is very sensitive to changes in the adenylate energy charge, especially from 0.4 to 0.9. The enzyme appears to be very sensitive to pro-oxidant conditions; in this regard, the possible involvement of a disulphide bridge (C175-C547) was investigated by using a C547A mutant NT5C2. Two cultured cell models were used to further assess the sensitivity of the enzyme to oxidative stress conditions. NT5C2, differently from other enzyme activities, was inactivated and not rescued by dithiothreitol in a astrocytoma cell line (ADF) incubated with hydrogen peroxide. The incubation of a human lung carcinoma cell line (A549) with 2-deoxyglucose lowered the cell energy charge and impaired the interaction of NT5C2 with the ice protease-activating factor (IPAF), a protein involved in innate immunity and inflammation.
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3
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Johanns M, Kviklyte S, Chuang SJ, Corbeels K, Jacobs R, Herinckx G, Vertommen D, Schakman O, Duparc T, Cani PD, Bouzin C, Andersén H, Bohlooly-Y M, Van der Schueren B, Oscarsson J, Rider MH. Genetic deletion of soluble 5'-nucleotidase II reduces body weight gain and insulin resistance induced by a high-fat diet. Mol Genet Metab 2019; 126:377-387. [PMID: 30803894 DOI: 10.1016/j.ymgme.2019.01.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 12/19/2018] [Accepted: 01/21/2019] [Indexed: 11/30/2022]
Abstract
We previously investigated whether inhibition of AMP-metabolizing enzymes could enhance AMP-activated protein kinase (AMPK) activation in skeletal muscle for the treatment of type 2 diabetes. Soluble 5'-nucleotidase II (NT5C2) hydrolyzes IMP and its inhibition could potentially lead to a rise in AMP to activate AMPK. In the present study, we investigated effects of NT5C2 deletion in mice fed a normal-chow diet (NCD) or a high-fat diet (HFD). On a NCD, NT5C2 deletion did not result in any striking metabolic phenotype. On a HFD however, NT5C2 knockout (NT5C2-/-) mice displayed reduced body/fat weight gain, improved glucose tolerance, reduced plasma insulin, triglyceride and uric acid levels compared with wild-type (WT) mice. There was a tendency towards smaller and fewer adipocytes in epididymal fat from NT5C2-/- mice compared to WT mice, consistent with a reduction in triglyceride content. Differences in fat mass under HFD could not be explained by changes in mRNA expression profiles of epididymal fat from WT versus NT5C2-/- mice. However, rates of lipolysis tended to increase in epididymal fat pads from NT5C2-/- versus WT mice, which might explain reduced fat mass. In incubated skeletal muscles, insulin-stimulated glucose uptake and associated signalling were enhanced in NT5C2-/- versus WT mice on HFD, which might contribute towards improved glycemic control. In summary, NT5C2 deletion in mice protects against HFD-induced weight gain, adiposity, insulin resistance and associated hyperglycemia.
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Affiliation(s)
- Manuel Johanns
- Université catholique de Louvain and de Duve Institute, Avenue Hippocrate 75, B-1200 Brussels, Belgium
| | - Samanta Kviklyte
- Université catholique de Louvain and de Duve Institute, Avenue Hippocrate 75, B-1200 Brussels, Belgium
| | - Sheng-Ju Chuang
- Université catholique de Louvain and de Duve Institute, Avenue Hippocrate 75, B-1200 Brussels, Belgium
| | - Katrien Corbeels
- Klinische en Experimentele Endocrinologie, Katholieke Universiteit Leuven, Herestraat 49, B-3000 Leuven, Belgium
| | - Roxane Jacobs
- Université catholique de Louvain and de Duve Institute, Avenue Hippocrate 75, B-1200 Brussels, Belgium
| | - Gaëtan Herinckx
- Université catholique de Louvain and de Duve Institute, Avenue Hippocrate 75, B-1200 Brussels, Belgium
| | - Didier Vertommen
- Université catholique de Louvain and de Duve Institute, Avenue Hippocrate 75, B-1200 Brussels, Belgium
| | - Olivier Schakman
- Université catholique de Louvain and Institute of Neuroscience, Avenue Mounier 53, B-1200 Brussels, Belgium
| | - Thibaut Duparc
- Université catholique de Louvain and WELBIO (Waloon Excellence in Life Sciences and Biotechnology), Louvain Drug Research Institute, Avenue Mounier 73, B-1200 Brussels, Belgium
| | - Patrice D Cani
- Université catholique de Louvain and WELBIO (Waloon Excellence in Life Sciences and Biotechnology), Louvain Drug Research Institute, Avenue Mounier 73, B-1200 Brussels, Belgium
| | - Caroline Bouzin
- Université catholique de Louvain and Institute of Clinical and Experimental Research, Avenue Hippocrate 55, B-1200 Brussels, Belgium
| | - Harriet Andersén
- Discovery Sciences, IMED Biotech Unit, AstraZeneca, Gothenburg, Sweden
| | | | - Bart Van der Schueren
- Klinische en Experimentele Endocrinologie, Katholieke Universiteit Leuven, Herestraat 49, B-3000 Leuven, Belgium
| | - Jan Oscarsson
- Discovery Sciences, IMED Biotech Unit, AstraZeneca, Gothenburg, Sweden
| | - Mark H Rider
- Université catholique de Louvain and de Duve Institute, Avenue Hippocrate 75, B-1200 Brussels, Belgium.
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Jordheim LP. Expanding the clinical relevance of the 5'-nucleotidase cN-II/ NT5C2. Purinergic Signal 2018; 14:321-9. [PMID: 30362044 DOI: 10.1007/s11302-018-9627-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 09/20/2018] [Indexed: 12/14/2022] Open
Abstract
Purine metabolism is depending on a large amount of enzymes to ensure cellular homeostasis. Among these enzymes, we have been interested in the 5'-nucleotidase cN-II and its role in cancer biology and in response of cancer cells to treatments. This protein has been cited and studied in a large number of papers published during the last decade for its involvement in non-cancerous pathologies such as hereditary spastic paraplegia, schizophrenia, and blood pressure regulation. Here, we review these articles in order to give an overview of the recently discovered clinical relevance of cN-II.
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Dieck CL, Tzoneva G, Forouhar F, Carpenter Z, Ambesi-Impiombato A, Sánchez-Martín M, Kirschner-Schwabe R, Lew S, Seetharaman J, Tong L, Ferrando AA. Structure and Mechanisms of NT5C2 Mutations Driving Thiopurine Resistance in Relapsed Lymphoblastic Leukemia. Cancer Cell 2018; 34:136-147.e6. [PMID: 29990496 PMCID: PMC6049837 DOI: 10.1016/j.ccell.2018.06.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 04/06/2018] [Accepted: 06/06/2018] [Indexed: 11/25/2022]
Abstract
Activating mutations in the cytosolic 5'-nucleotidase II gene NT5C2 drive resistance to 6-mercaptopurine in acute lymphoblastic leukemia. Here we demonstrate that constitutively active NT5C2 mutations K359Q and L375F reconfigure the catalytic center for substrate access and catalysis in the absence of allosteric activator. In contrast, most relapse-associated mutations, which involve the arm segment and residues along the surface of the inter-monomeric cavity, disrupt a built-in switch-off mechanism responsible for turning off NT5C2. In addition, we show that the C-terminal acidic tail lost in the Q523X mutation functions to restrain NT5C2 activation. These results uncover dynamic mechanisms of enzyme regulation targeted by chemotherapy resistance-driving NT5C2 mutations, with important implications for the development of NT5C2 inhibitor therapies.
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Affiliation(s)
- Chelsea L Dieck
- Institute for Cancer Genetics, Columbia University, New York, NY 10032, USA
| | - Gannie Tzoneva
- Institute for Cancer Genetics, Columbia University, New York, NY 10032, USA
| | - Farhad Forouhar
- Hervert Irving Comprehensive Cancer Center, Columbia University, New York, NY 10032, USA; Department of Biological Sciences, Northeast Structural Genomics Consortium, Columbia University, 1212 Amsterdam Avenue, 701 Fairchild Center, New York, NY 10027, USA
| | - Zachary Carpenter
- Department of Systems Biology, Columbia University, New York, NY 10032, USA
| | | | | | - Renate Kirschner-Schwabe
- Department of Pediatric Oncology/Hematology, Charité-Universitätsmedizin Berlin, Berlin 10117, Germany
| | - Scott Lew
- Department of Biological Sciences, Northeast Structural Genomics Consortium, Columbia University, 1212 Amsterdam Avenue, 701 Fairchild Center, New York, NY 10027, USA
| | | | - Liang Tong
- Department of Biological Sciences, Northeast Structural Genomics Consortium, Columbia University, 1212 Amsterdam Avenue, 701 Fairchild Center, New York, NY 10027, USA.
| | - Adolfo A Ferrando
- Institute for Cancer Genetics, Columbia University, New York, NY 10032, USA; Department of Systems Biology, Columbia University, New York, NY 10032, USA; Department of Pediatrics, Columbia University Medical Center, 1130 St. Nicholas Avenue, ICRC 402, New York, NY 10032, USA; Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032, USA.
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6
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Straussberg R, Onoufriadis A, Konen O, Zouabi Y, Cohen L, Lee JYW, Hsu CK, Simpson MA, McGrath JA. Novel homozygous missense mutation in NT5C2 underlying hereditary spastic paraplegia SPG45. Am J Med Genet A 2017; 173:3109-3113. [PMID: 28884889 DOI: 10.1002/ajmg.a.38414] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 07/18/2017] [Accepted: 07/29/2017] [Indexed: 01/23/2023]
Abstract
SPG45 is a rare form of autosomal recessive spastic paraplegia associated with mental retardation. Detailed phenotyping and mutation analysis was undertaken in three individuals with SPG45 from a consanguineous family of Arab Muslim origin. Using whole-exome sequencing, we identified a novel homozygous missense mutation in NT5C2 (c.1379T>C; p.Leu460Pro). Our data expand the molecular basis of SPG45, adding the first missense mutation to the current database of nonsense, frameshift, and splice site mutations. NT5C2 mutations seem to have a broad clinical spectrum and should be sought in patients manifesting either as uncomplicated or complicated HSP.
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Affiliation(s)
- Rachel Straussberg
- Neurogenetic Clinic, Neurology Institute, Schneider Children's Medical Center, Petah Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Alexandros Onoufriadis
- St John's Institute of Dermatology, Division of Genetics and Molecular Medicine, King's College London, London, UK
| | - Osnat Konen
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Radiology Institute, Schneider Children's Medical Center, Petah Tikva, Israel
| | - Yasmin Zouabi
- Neurogenetic Clinic, Neurology Institute, Schneider Children's Medical Center, Petah Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Lior Cohen
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Genetic Institute, Schneider Children's Medical Center, Petah Tikva, Israel
| | - John Y W Lee
- St John's Institute of Dermatology, Division of Genetics and Molecular Medicine, King's College London, London, UK
| | - Chao-Kai Hsu
- St John's Institute of Dermatology, Division of Genetics and Molecular Medicine, King's College London, London, UK
| | - Michael A Simpson
- Department of Medical and Molecular Genetics, Division of Genetics and Molecular Medicine, King's College London, Guy's Hospital, London, UK
| | - John A McGrath
- St John's Institute of Dermatology, Division of Genetics and Molecular Medicine, King's College London, London, UK
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7
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Kviklyte S, Vertommen D, Yerna X, Andersén H, Xu X, Gailly P, Bohlooly-Y M, Oscarsson J, Rider MH. Effects of genetic deletion of soluble 5'-nucleotidases NT5C1A and NT5C2 on AMPK activation and nucleotide levels in contracting mouse skeletal muscles. Am J Physiol Endocrinol Metab 2017; 313:E48-E62. [PMID: 28325731 DOI: 10.1152/ajpendo.00304.2016] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 02/24/2017] [Accepted: 03/13/2017] [Indexed: 11/22/2022]
Abstract
AMP-activated protein kinase (AMPK) plays a key role in energy homeostasis and is activated in response to contraction-induced ATP depletion in skeletal muscle via a rise in intracellular AMP/ADP concentrations. AMP can be deaminated by AMP-deaminase (AMPD) to IMP, which is hydrolyzed to inosine by cytosolic 5'-nucleotidase II (NT5C2). AMP can also be hydrolyzed to adenosine by cytosolic 5'-nucleotidase 1A (NT5C1A). Previous gene silencing and overexpression studies indicated control of AMPK activation by NT5C enzymes. In the present study using gene knockout mouse models, we investigated the effects of NT5C1A and NT5C2 deletion on intracellular adenine nucleotide levels and AMPK activation in electrically stimulated skeletal muscles. Surprisingly, NT5C enzyme knockout did not lead to enhanced AMP or ADP concentrations in response to contraction, with no potentiation of increases in AMPK activity in extensor digitorum longus (EDL) and soleus mouse muscles. Moreover, dual blockade of AMP metabolism in EDL using an AMPD inhibitor combined with NT5C1A deletion did not enhance rises in AMP and ADP or increased AMPK activation by electrical stimulation. The results on muscles from the NT5C knockout mice contradict previous findings where AMP levels and AMPK activity were shown to be modulated by NT5C enzymes.
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Affiliation(s)
- Samanta Kviklyte
- de Duve Institute, Université catholique de Louvain, Brussels, Belgium
| | - Didier Vertommen
- de Duve Institute, Université catholique de Louvain, Brussels, Belgium
| | - Xavier Yerna
- Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium; and
| | | | - Xiufeng Xu
- AstraZeneca Research and Development, Mölndal, Sweden
| | - Philippe Gailly
- Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium; and
| | | | - Jan Oscarsson
- AstraZeneca Research and Development, Mölndal, Sweden
| | - Mark H Rider
- de Duve Institute, Université catholique de Louvain, Brussels, Belgium;
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Elsaid MF, Ibrahim K, Chalhoub N, Elsotouhy A, El Mudehki N, Abdel Aleem A. NT5C2 novel splicing variant expands the phenotypic spectrum of Spastic Paraplegia (SPG45): case report of a new member of thin corpus callosum SPG-Subgroup. BMC Med Genet 2017; 18:33. [PMID: 28327087 PMCID: PMC5359868 DOI: 10.1186/s12881-017-0395-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 03/07/2017] [Indexed: 01/06/2023]
Abstract
Background Hereditary Spastic Paraplegia (HSP) is a genetically heterogeneous group of neurodegenerative diseases. Thin Corpus Callosum (TCC) associated HSP is a distinguished subgroup of complex forms. Purines and pyrimidine, the basic DNA and RNA components, are regulating the cell metabolism, having roles in signal transduction, energy preservation and cellular repair. Genetic defects in nucleotide metabolism related genes have been only recently implicated in brain and neurodegenerative diseases’ pathogenesis. Case presentation We present a consanguineous Qatari family with two brothers, 9 and 3 years, who displayed a characteristic phenotype of early onset and markedly-severe spasticity with tiptoe walking, delayed dysarthric speech, persistent truncal hypotonia, and multiple variable-sized areas of brownish skin discoloration appearing at different places on the body. A clinical diagnosis suggestive of complex hereditary spastic paraplegia (HSP) was set after the family had the second affected child. Whole genome sequencing identified a novel homozygous NT5C2 splice site mutation (NM_012229.4/NM_001134373.2: c.1159 + 1G > T) that recessively segregated in family members. Brain MRI revealed dysgenic and thin corpus callosum (TCC) with peri-trigonal white matter cystic changes in both affected boys, whereas a well-developed corpus callosum with normal white matter was shown in their apparently normal brother, who found to be a carrier for the mutant variant. This mutation led to skipping of exon 14 with removal of 58 amino acid residues at the C-terminal half. The aberrantly spliced NT5C2 showed substantial reduction in expression level in the in-vitro study, indicating marked instability of the mutant NT5C2 protein. Conclusion The present report expands the phenotypic spectrum of SPG45 and confirms NT5C2-SPG45 as a member of the rare TCC SPG-subtypes. Homozygous alteration in NT5C2 seems essential to produce central white matter developmental defects. The study highlights the importance of cytosolic II 5’-nucleotidase (NT5C2) in maintaining the normal balance of purines’ pool in the brain, which seems to play a pivotal role in the normal development of central white matter structures. Electronic supplementary material The online version of this article (doi:10.1186/s12881-017-0395-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Mahmoud F Elsaid
- Pediatric Neurology Department, Hamad Medical Corporation, Doha, Qatar
| | - Khalid Ibrahim
- Pediatric Neurology Department, Hamad Medical Corporation, Doha, Qatar
| | - Nader Chalhoub
- Neurogenetics Research program, Neurology Department, Weill Cornell Medical College, Qatar Foundation- Education City, 24144, Doha, Qatar.,Neurology Department, Weill Cornell Medical College, New York, USA
| | - Ahmed Elsotouhy
- Radiology Department, Hamad Medical Corporation, Doha, Qatar
| | - Noora El Mudehki
- Physiotherapy Department, Hamad Medical Corporation, Doha, Qatar
| | - Alice Abdel Aleem
- Neurogenetics Research program, Neurology Department, Weill Cornell Medical College, Qatar Foundation- Education City, 24144, Doha, Qatar. .,Neurology Department, Weill Cornell Medical College, New York, USA.
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9
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Guan F, Zhang T, Li L, Fu D, Lin H, Chen G, Chen T. Two-stage replication of previous genome-wide association studies of AS3MT-CNNM2- NT5C2 gene cluster region in a large schizophrenia case-control sample from Han Chinese population. Schizophr Res 2016; 176:125-130. [PMID: 27401531 DOI: 10.1016/j.schres.2016.07.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2015] [Revised: 06/29/2016] [Accepted: 07/04/2016] [Indexed: 12/28/2022]
Abstract
Schizophrenia is a devastating psychiatric condition with high heritability. Replicating the specific genetic variants that increase susceptibility to schizophrenia in different populations is critical to better understand schizophrenia. CNNM2 and NT5C2 are genes recently identified as susceptibility genes for schizophrenia in Europeans, but the exact mechanism by which these genes confer risk for schizophrenia remains unknown. In this study, we examined the potential for genetic susceptibility to schizophrenia of a three-gene cluster region, AS3MT-CNNM2-NT5C2. We implemented a two-stage strategy to conduct association analyses of the targeted regions with schizophrenia. A total of 8218 individuals were recruited, and 45 pre-selected single nucleotide polymorphisms (SNPs) were genotyped. Both single-marker and haplotype-based analyses were conducted in addition to imputation analysis to increase the coverage of our genetic markers. Two SNPs, rs11191419 (OR=1.24, P=7.28×10(-5)) and rs11191514 (OR=1.24, P=0.0003), with significant independent effects were identified. These results were supported by the data from both the discovery and validation stages. Further haplotype and imputation analyses also validated these results, and bioinformatics analyses indicated that CALHM1, which is located approximately 630kb away from CNNM2, might be a susceptible gene for schizophrenia. Our results provide further support that AS3MT, CNNM2 and CALHM1 are involved with the etiology and pathogenesis of schizophrenia, suggesting these genes are potential targets of interest for the improvement of disease management and the development of novel pharmacological strategies.
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Affiliation(s)
- Fanglin Guan
- Department of Forensic Psychiatry, School of Medicine & Forensics, Xi'an Jiaotong University, Xi'an, China; Key Laboratory of National Ministry of Health for Forensic Sciences, School of Medicine & Forensics, Xi'an Jiaotong University, Xi'an, China; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi'an, China.
| | - Tianxiao Zhang
- Department of Psychiatry, School of Medicine, Washington University, Saint Louis, MO, USA.
| | - Lu Li
- Department of Forensic Psychiatry, School of Medicine & Forensics, Xi'an Jiaotong University, Xi'an, China; Key Laboratory of National Ministry of Health for Forensic Sciences, School of Medicine & Forensics, Xi'an Jiaotong University, Xi'an, China
| | - Dongke Fu
- Key Laboratory of National Ministry of Health for Forensic Sciences, School of Medicine & Forensics, Xi'an Jiaotong University, Xi'an, China; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi'an, China
| | - Huali Lin
- Xi'an Mental Health Center, Xi'an, China
| | - Gang Chen
- Key Laboratory of National Ministry of Health for Forensic Sciences, School of Medicine & Forensics, Xi'an Jiaotong University, Xi'an, China
| | - Teng Chen
- Department of Forensic Psychiatry, School of Medicine & Forensics, Xi'an Jiaotong University, Xi'an, China; Key Laboratory of National Ministry of Health for Forensic Sciences, School of Medicine & Forensics, Xi'an Jiaotong University, Xi'an, China; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi'an, China
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