Clinical and Genetic Aspects of Huntington’s Disease in the Malian Population

• Published in: Journal of Huntington's disease Vol. 11; no. 2; pp. 195 - 201
• Main Authors: Bocoum, Abdoulaye, Coulibaly, Toumany, Ouologuem, Madani, Cissé, Lassana, Diallo, Seybou H., Maiga, Boubacar B., Dembélé, Kékouta, Diallo, Salimata, Coulibaly, Souleymane dit Papa, Kané, Fousseyni, Coulibaly, Thomas, Coulibaly, Dramane, Taméga, Abdoulaye, Yalcouyé, Abdoulaye, Diarra, Salimata, Dembélé, Mohamed E., Maiga, Alassane B., Cissé, Cheick A.K., Traoré, Oumou, Fischbeck, Kenneth H., Guinto, Cheick O., Maiga, Youssoufa, Landouré, Guida
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.01.2022; IOS Press BV
• Subjects: Cognitive ability; Genetic diversity; Genetic screening; Haplotypes; Hereditary diseases; Huntington's disease; Huntingtons disease; Mutation; Neurodegenerative diseases; Neuroimaging; Patients; Phenotypes; Polyglutamine; Trinucleotide repeat diseases; Trinucleotide repeats; Africa; HTT; Huntington’s disease; Mali; Sub-Saharan Africa
• ISSN: 1879-6397; 1879-6397; 1879-6400
• DOI: 10.3233/JHD-220529

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.