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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. Res Sq 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] [What about the content of this article? (0)] [Affiliation(s)] [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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2
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Yeetong P, Dembélé ME, Pongpanich M, Cissé L, Srichomthong C, Maiga AB, Dembélé K, Assawapitaksakul A, Bamba S, Yalcouyé A, Diarra S, Mefoung SE, Rakwongkhachon S, Traoré O, Tongkobpetch S, Fischbeck KH, Gahl WA, Guinto CO, Shotelersuk V, Landouré G. Pentanucleotide Repeat Insertions in RAI1 Cause Benign Adult Familial Myoclonic Epilepsy Type 8. Mov Disord 2024; 39:164-172. [PMID: 37994247 PMCID: PMC10872918 DOI: 10.1002/mds.29654] [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: 07/11/2023] [Revised: 10/04/2023] [Accepted: 10/24/2023] [Indexed: 11/24/2023] Open
Abstract
BACKGROUND Benign adult familial myoclonic epilepsy (BAFME) is an autosomal dominant disorder characterized by cortical tremors and seizures. Six types of BAFME, all caused by pentanucleotide repeat expansions in different genes, have been reported. However, several other BAFME cases remain with no molecular diagnosis. OBJECTIVES We aim to characterize clinical features and identify the mutation causing BAFME in a large Malian family with 10 affected members. METHODS Long-read whole genome sequencing, repeat-primed polymerase chain reaction and RNA studies were performed. RESULTS We identified TTTTA repeat expansions and TTTCA repeat insertions in intron 4 of the RAI1 gene that co-segregated with disease status in this family. TTTCA repeats were absent in 200 Malian controls. In the affected individuals, we found a read with only nine TTTCA repeat units and somatic instability. The RAI1 repeat expansions cause the only BAFME type in which the disease-causing repeats are in a gene associated with a monogenic disorder in the haploinsufficiency state (ie, Smith-Magenis syndrome [SMS]). Nevertheless, none of the Malian patients exhibited symptoms related to SMS. Moreover, leukocyte RNA levels of RAI1 in six Malian BAFME patients were no different from controls. CONCLUSIONS These findings establish a new type of BAFME, BAFME8, in an African family and suggest that haploinsufficiency is unlikely to be the main pathomechanism of BAFME. © 2023 International Parkinson and Movement Disorder Society. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.
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Affiliation(s)
- Patra Yeetong
- Division of Human Genetics, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | | | - Monnat Pongpanich
- Department of Mathematics and Computer Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
- Omics Sciences and Bioinformatics Center, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Lassana Cissé
- Service de Neurologie, Centre Hospitalier Universitaire du Point G, Bamako, Mali
| | - Chalurmpon Srichomthong
- Center of Excellence for Medical Genomics, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
- Excellence Center for Genomics and Precision Medicine, King Chulalongkorn Memorial Hospital, the Thai Red Cross Society, Bangkok 10330, Thailand
| | | | | | - Adjima Assawapitaksakul
- Center of Excellence for Medical Genomics, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
- Excellence Center for Genomics and Precision Medicine, King Chulalongkorn Memorial Hospital, the Thai Red Cross Society, Bangkok 10330, Thailand
| | - Salia Bamba
- Faculté de Médecine et d’Odontostomatologie, USTTB, Bamako, Mali
| | | | - Salimata Diarra
- Faculté de Médecine et d’Odontostomatologie, USTTB, Bamako, Mali
- Yale University, Pediatric Genomics Discovery Program, Department of Pediatrics, New Haven, CT, United States
- Neurogenetics Branch, NINDS, NIH, Bethesda, MD, United States
| | | | - Supphakorn Rakwongkhachon
- Center of Excellence for Medical Genomics, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
- Excellence Center for Genomics and Precision Medicine, King Chulalongkorn Memorial Hospital, the Thai Red Cross Society, Bangkok 10330, Thailand
| | - Oumou Traoré
- Faculté de Médecine et d’Odontostomatologie, USTTB, Bamako, Mali
| | - Siraprapa Tongkobpetch
- Center of Excellence for Medical Genomics, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
- Excellence Center for Genomics and Precision Medicine, King Chulalongkorn Memorial Hospital, the Thai Red Cross Society, Bangkok 10330, Thailand
| | | | - William A Gahl
- Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Cheick O Guinto
- Faculté de Médecine et d’Odontostomatologie, USTTB, Bamako, Mali
- Service de Neurologie, Centre Hospitalier Universitaire du Point G, Bamako, Mali
| | - Vorasuk Shotelersuk
- Center of Excellence for Medical Genomics, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
- Excellence Center for Genomics and Precision Medicine, King Chulalongkorn Memorial Hospital, the Thai Red Cross Society, Bangkok 10330, Thailand
| | - Guida Landouré
- Faculté de Médecine et d’Odontostomatologie, USTTB, Bamako, Mali
- Service de Neurologie, Centre Hospitalier Universitaire du Point G, Bamako, Mali
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3
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Bocoum A, Coulibaly T, Ouologuem M, Cissé L, Diallo SH, Maiga BB, Dembélé K, Diallo S, Coulibaly SDP, Kané F, Coulibaly T, Coulibaly D, Taméga A, Yalcouyé A, Diarra S, Dembélé ME, Maiga AB, Cissé CAK, Traoré O, Fischbeck KH, Guinto CO, Maiga Y, Landouré G. Clinical and Genetic Aspects of Huntington's Disease in the Malian Population. J Huntingtons Dis 2022; 11:195-201. [PMID: 35311712 DOI: 10.3233/jhd-220529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Huntington's disease (HD) is an autosomal dominant neurodegenerative disorder caused by mutation in the HTT gene and characterized by involuntary movements as well as cognitive and behavioral impairment. Since its first description 150 years ago, studies have been reported worldwide. However, genetically confirmed cases have been scarce in Africa. OBJECTIVE To describe the clinical and genetic aspects of HD in the Malian population. METHODS Patients with HD phenotype and their relatives were enrolled after obtaining consent. Symptoms were assessed using the Total Motor Scale (TMS) of the United Huntington's Disease Rating Scale (UHDRS) and the Mini-Mental State Examination (MMSE). Brain imaging and blood tests were performed to exclude other causes. DNA was extracted for HTT sequencing. RESULTS Eighteen patients (13 families) with a HD phenotype were evaluated. A familial history of the disease was found in 84.6% with 55.5% of maternal transmission. The average length of the HTT CAG repeat was 43.6±11.5 (39-56) CAGs. The mean age at onset was 43.1±9.7years. Choreic movements were the predominant symptoms (100% of the cases) with an average TMS of 49.4±30.8, followed by cognitive impairment (average MMSE score: 23.0±12.0) and psychiatric symptoms with 22.2% and 44.4%, respectively. CONCLUSION This is one of the largest HD cohorts reported in Africa. Increasing access to genetic testing could uncover many other HD cases and disease-modifying genetic variants. Future haplotype and psychosocial studies may inform the origin of the Malian mutation and the impact of the disease on patients and their relatives.
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Affiliation(s)
- Abdoulaye Bocoum
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali
| | | | | | - Lassana Cissé
- Service de Neurologie, CHU du Point "G", Bamako, Mali
| | - Seybou H Diallo
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali.,Service de Neurologie, CHU de Gabriel Touré, Bamako, Mali
| | | | | | | | - Souleymane Dit Papa Coulibaly
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali.,Service de Psychiatrie, CHU du Point "G", Bamako, Mali
| | - Fousseyni Kané
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali
| | - Thomas Coulibaly
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali.,Service de Neurologie, CHU du Point "G", Bamako, Mali
| | | | - Abdoulaye Taméga
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali
| | | | - Salimata Diarra
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali.,Service de Psychiatrie, CHU du Point "G", Bamako, Mali
| | | | - Alassane B Maiga
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali
| | - Cheick A K Cissé
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali
| | - Oumou Traoré
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali
| | | | - Cheick O Guinto
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali.,Service de Neurologie, CHU du Point "G", Bamako, Mali
| | - Youssoufa Maiga
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali.,Service de Neurologie, CHU de Gabriel Touré, Bamako, Mali
| | - Guida Landouré
- Faculté de Médecine et d'Odontostomatologie, USTTB, Bamako, Mali.,Service de Neurologie, CHU du Point "G", Bamako, Mali.,Neurogenetics Branch, NINDS, NIH, Bethesda, MD, USA
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4
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Cissé CAK, Cissé L, Ba HO, Samassékou O, Simaga A, Taméga A, Diarra S, Diallo SH, Coulibaly T, Diallo S, Yalcouyé A, Maiga AB, Keita M, Fischbeck KH, Traoré SF, Guinto CO, Landouré G. Friedreich ataxia in a family from Mali, West Africa/Friedreich ataxia in a Malian family. Clin Case Rep 2021; 9:e04065. [PMID: 34084490 PMCID: PMC8142306 DOI: 10.1002/ccr3.4065] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 03/07/2021] [Indexed: 11/10/2022] Open
Abstract
Friedreich ataxia is the most common inherited ataxia in the world, but yet to be reported in black African. We report the first genetically confirmed case in a West African family. Studying genetic diseases in populations with diverse backgrounds may give new insights into their pathophysiology for future therapeutic targets.
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Affiliation(s)
| | - Lassana Cissé
- Service de NeurologieCentre Hospitalier Universitaire du Point “G”BamakoMali
| | - Hamidou O. Ba
- Faculté de Médecine et d'OdontostomatologieUSTTBBamakoMali
- Service de CardiologieCentre Hospitalier Universitaire de Gabriel TouréBamakoMali
| | | | - Assiatou Simaga
- Faculté de Médecine et d'OdontostomatologieUSTTBBamakoMali
- Institut d’Ophtalmologie Tropicale d’AfriqueBamakoMali
| | | | - Salimata Diarra
- Faculté de Médecine et d'OdontostomatologieUSTTBBamakoMali
- Neurogenetics BranchNINDSNIHBethesdaMDUSA
| | - Seybou H. Diallo
- Faculté de Médecine et d'OdontostomatologieUSTTBBamakoMali
- Service de NeurologieCentre Hospitalier Universitaire de Gabriel TouréBamakoMali
| | - Thomas Coulibaly
- Faculté de Médecine et d'OdontostomatologieUSTTBBamakoMali
- Service de NeurologieCentre Hospitalier Universitaire du Point “G”BamakoMali
| | - Salimata Diallo
- Service de NeurologieCentre Hospitalier Universitaire de Gabriel TouréBamakoMali
| | | | | | - Mohamed Keita
- Faculté de Médecine et d'OdontostomatologieUSTTBBamakoMali
- Service d’ORLCentre Hospitalier Universitaire de Gabriel TouréBamakoMali
| | | | - Sékou F. Traoré
- Malaria Research and Training CenterDepartment of EntomologyUSTTBBamakoMali
| | - Cheick O. Guinto
- Faculté de Médecine et d'OdontostomatologieUSTTBBamakoMali
- Service de NeurologieCentre Hospitalier Universitaire du Point “G”BamakoMali
| | - Guida Landouré
- Faculté de Médecine et d'OdontostomatologieUSTTBBamakoMali
- Service de NeurologieCentre Hospitalier Universitaire du Point “G”BamakoMali
- Neurogenetics BranchNINDSNIHBethesdaMDUSA
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