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Kotioumbe M, Maiga AB, Bamba S, Cissé L, Diarra S, Diallo S, Yalcouyé A, Kané F, Diallo SH, Coulibaly D, Coulibaly T, Dembélé K, Maiga B, Guinto CO, Landouré G. A novel variant in the GNE gene in a Malian patient presenting with distal myopathy. RESEARCH SQUARE 2024:rs.3.rs-4004982. [PMID: 38496429 PMCID: PMC10942567 DOI: 10.21203/rs.3.rs-4004982/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Background GNE myopathy (GM) is a rare autosomal recessive disorder caused by variants in the GNE gene and characterized by progressive distal muscle weakness and atrophy. We report a novel variant in theGNE gene causing GM in a consanguineous Malian family. Case presentation A 19-year-old male patient from a consanguineous family of Bambara ethnicity was seen for progressive walking difficulty and frequent falls. Neurological examination found distalmuscle weakness and atrophy and reduced tendon reflexes in four limbs. Electroneuromyography (ENMG) showed an axonal neuropathy pattern with reduced distal motor amplitudes. Charcot-Marie-Tooth (CMT) gene panel testing (Medical Neurogenetics LLC, Atlanta, GA) was negative. However, whole exome sequencing (WES) revealed a novel biallelic variant in GNE (c.1838G>A:p.Gly613Glu), segregating with the phenotype in the family. This variant is predicted to be pathogenic by several in silicoprediction tools including CADD= 29. Moreover, protein folding model showed major structural disruptions in the mutant protein. Conclusion This study reports a novel variant in the GNE gene causing GM, the first molecularly diagnosed in sub-Saharan Africa (SSA). It highlights the diagnosis challenges in this region and broadens the genetic spectrum of this rare disease.
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Affiliation(s)
- Mahamadou Kotioumbe
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Alassane B Maiga
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Salia Bamba
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Lassana Cissé
- Service de Neurologie, Centre Hospitalier Universitaire du Point "G", Bamako
| | - Salimata Diarra
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Salimata Diallo
- Service de Neurologie, Centre Hospitalier Universitaire "Gabriel Touré", Bamako
| | - Abdoulaye Yalcouyé
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Fousseyni Kané
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Seybou H Diallo
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Dramane Coulibaly
- Service de Médecine, Centre Hospitalier Universitaire "Le Luxembourg", Bamako
| | - Thomas Coulibaly
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Kékouta Dembélé
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Boubacar Maiga
- Service de Neurologie, Centre Hospitalier Universitaire du Point "G", Bamako
| | - Cheick O Guinto
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
| | - Guida Landouré
- Faculté de Médecine et d'Odontostomatologie, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako
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Wang M, Yang H, Lin Z, Li X, Liu L, Huang S, Zhao H, Zhu X, Xiao Q, Duan R, Wang J, Zuchner S, Tang B, Zhang R. The genetic and clinical spectrum in a cohort of 39 families with complex inherited peripheral neuropathies. J Neurol 2023; 270:4959-4967. [PMID: 37365282 DOI: 10.1007/s00415-023-11821-z] [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: 05/06/2023] [Revised: 06/07/2023] [Accepted: 06/11/2023] [Indexed: 06/28/2023]
Abstract
With complicated conditions and a large number of potentially causative genes, the diagnosis of a patient with complex inherited peripheral neuropathies (IPNs) is challenging. To provide an overview of the genetic and clinical features of 39 families with complex IPNs from central south China and to optimize the molecular diagnosis approach to this group of heterogeneous diseases, a total of 39 index patients from unrelated families were enrolled, and detailed clinical data were collected. TTR Sanger sequencing, hereditary spastic paraplegia (HSP) gene panel, and dynamic mutation detection in spinocerebellar ataxia (SCAs) were performed according to the respective additional clinical features. Whole-exome sequencing (WES) was used in patients with negative or unclear results. Dynamic mutation detection in NOTCH2NLC and RCF1 was applied as a supplement to WES. As a result, an overall molecular diagnosis rate of 89.7% was achieved. All 21 patients with predominant autonomic dysfunction and multiple organ system involvement carried pathogenic variants in TTR, among which nine had c.349G > T (p.A97S) hotspot variants. Five out of 7 patients (71.4%) with muscle involvement harbored biallelic pathogenic variants in GNE. Five out of 6 patients (83.3%) with spasticity reached definite genetic causes in SACS, KIF5A, BSCL2, and KIAA0196, respectively. NOTCH2NLC GGC repeat expansions were identified in all three cases accompanied by chronic coughing and in one patient accompanied by cognitive impairment. The pathogenic variants, p.F284S and p.G111R in GNE, and p.K4326E in SACS, were first reported. In conclusion, transthyretin amyloidosis with polyneuropathy (ATTR-PN), GNE myopathy, and neuronal intranuclear inclusion disease (NIID) were the most common genotypes in this cohort of complex IPNs. NOTCH2NLC dynamic mutation testing should be added to the molecular diagnostic workflow. We expanded the genetic and related clinical spectrum of GNE myopathy and ARSACS by reporting novel variants.
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Affiliation(s)
- Mengli Wang
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Honglan Yang
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Zhiqiang Lin
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Xiaobo Li
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Lei Liu
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Shunxiang Huang
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Huadong Zhao
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Xiying Zhu
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Qiao Xiao
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Ranhui Duan
- Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, China
| | - Junling Wang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Stephan Zuchner
- Dr John T. Macdonald Foundation Department of Human Genetics and John P. Hussman Institute for Human Genomics, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Beisha Tang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Ruxu Zhang
- Department of Neurology, The Third Xiangya Hospital, Central South University, Changsha, China.
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Yadav R, Devi SS, Oswalia J, Ramalingam S, Arya R. Role of HSP70 chaperone in protein aggregate phenomenon of GNE mutant cells: Therapeutic lead for GNE Myopathy. Int J Biochem Cell Biol 2022; 149:106258. [PMID: 35777599 DOI: 10.1016/j.biocel.2022.106258] [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: 03/22/2022] [Revised: 06/04/2022] [Accepted: 06/25/2022] [Indexed: 10/17/2022]
Abstract
Limited treatment options and research in understanding the pathomechanisms of rare diseases has raised concerns about their therapeutic development. One such poorly understood ultra-rare neuromuscular disorder is GNE Myopathy (GNEM) which is caused due to mutation in key sialic acid biosynthetic enzyme, GNE. Treatment with sialic acid or its derivatives/precursors slows the disease progression, but curative strategies need to be explored further. Pathologically, muscle biopsy samples of GNEM patients reveal rimmed vacuole formation due to aggregation of β-amyloid, Tau, presenilin proteins with unknown mechanism. The present study aims to understand the mechanism of protein aggregate formation in GNE mutant cells to decipher role of chaperones in disease phenotype. The pathologically relevant GNE mutations expressed as recombinant proteins in HEK cells was used as a model system for GNEM to estimate extent of protein aggregation. We identified HSP70, a chaperone, as binding partner of GNE. Downregulation of HSP70 with altered BAG3, JNK, BAX expression levels was observed in GNE mutant cells. The cell apoptosis was observed in GNE mutation specific manner. An activator of HSP70 chaperone, BGP-15, rescued the phenotypic defects due to GNE mutation, thereby, reducing protein aggregation significantly. The results were further validated in rat skeletal muscle cell lines carrying single Gne allele. Our study suggests that HSP70 activators can be a promising therapeutic target in the treatment of ultra-rare GNE Myopathy disease.
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Affiliation(s)
- Rashmi Yadav
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India.
| | | | - Jyoti Oswalia
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India.
| | | | - Ranjana Arya
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India; Special Center for Systems Medicine, Jawaharlal Nehru University, New Delhi 110067, India.
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