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Neurogenomics in Africa: Perspectives, Progress, Possibilities and Priorities Journal of the Neurological Sciences 366 (2016) 213–223 Contents lists available at ScienceDirect Journal of the Neurological Sciences journal homepage: www.elsevier.com/locate/jns Review article Neurogenomics in Africa: Perspectives, progress, possibilities and priorities Rufus O. Akinyemi a,b,⁎,MayowaO.Owolabic, Tolulope Oyeniyi d, Bruce Ovbiagele e, Donna K. Arnett f, Hemant K. Tiwari f, Richard Walker g, Adesola Ogunniyi c, Raj N. Kalaria b,⁎⁎ and SIREN group of H3Africa Consortium a Institute for Advanced Medical Research and Training, College of Medicine, University of Ibadan, Nigeria b Institute of Neuroscience, Newcastle University, UK c Department of Medicine, College of Medicine, University of Ibadan, Nigeria d Department of Human Genetics, University of Glasgow, UK e Department of Neurosciences, Medical University of South Carolina, USA f School of Public Health, University of Alabama at Birmingham, USA g Institute of Health and Society, Newcastle University, UK article info abstract Article history: The understanding of the genetic basis of neurological disorders has grown rapidly in the last two decades. De- Received 23 April 2016 spite the genomic heterogeneity within African populations, large-scale candidate gene or linkage and exome Accepted 4 May 2016 studies are lacking. However, current knowledge on neurogenetics in African populations is limited and geo- Available online 06 May 2016 graphically very uneven. Isolated reports indicate the existence of autosomal dominant or recessive conditions incorporating cerebrovascular, movement, neuromuscular, seizure and motor neuron disorders in Africans. In Keywords: addition, few African families with neurodegenerative disorders associated with dementia have been character- Africa Burden of disease ized in North, West and South Africa. The current insurgency in genomic research triggered by among others the Capacity building Human Health and Heredity (H3) Africa Initiative indicates that there are unique opportunities to advance our Genomics knowledge and understanding of the influence of genomic variation on the pattern, presentations and prognosis Genetics of neurological disorders in Africa. These have enormous potential to unmask novel genes and molecular path- Neurological disorders ways germane to the neurobiology of brain disorders. It would facilitate the development of novel diagnostics, preventative and targeted treatments in the new paradigm of precision medicine. Nevertheless, it is crucial to strike a balance between effective traditional public health strategies and personalized genome based care. The translational barriers can be overcome through robust stakeholder engagement and sustainable multilevel, mul- tigenerational and multidisciplinary capacity building and infrastructural development for genomic medicine in Africa. © 2016 Elsevier B.V. All rights reserved. Contents 1. Introduction.............................................................. 214 2. Perspectivesonwhatisknown...................................................... 214 2.1. Africanhumangenomicvariation................................................. 214 2.2. Cerebrovasculardisorders..................................................... 215 2.2.1. Stroke......................................................... 215 2.2.2. Hereditarystrokedisorders................................................ 215 2.3. Movementdisorders....................................................... 215 2.3.1. Parkinson'sdisease.................................................... 215 2.3.2. Huntington'sdisease................................................... 216 2.3.3. Spinocerebellarataxiasanddystonias........................................... 216 ⁎ Correspondence to: R.O. Akinyemi, Institute for Advanced Medical Research and Training, College of Medicine, University of Ibadan, Ibadan, Nigeria. ⁎⁎ Corresponding author. E-mail addresses: [email protected] (R.O. Akinyemi), [email protected] (R.N. Kalaria). http://dx.doi.org/10.1016/j.jns.2016.05.006 0022-510X/© 2016 Elsevier B.V. All rights reserved. 214 R.O. Akinyemi et al. / Journal of the Neurological Sciences 366 (2016) 213–223 2.4. Dementias............................................................ 217 2.5. Seizuredisorders......................................................... 218 2.6. Demyelinatingdisorders..................................................... 219 2.7. Neuromusculardisorders..................................................... 219 2.8. Motorneurondisorders...................................................... 219 2.9. Otherconditions......................................................... 219 3. ProgressthroughtheH3AfricaInitiative.................................................. 219 4. Possibilitiesoffuturegainsinknowledge................................................. 219 5. PrioritiesfortranslationalgenomicsinAfrica................................................ 220 Searchstrategyandsystematicreview..................................................... 221 Acknowledgment.............................................................. 221 References.................................................................. 221 1. Introduction identify and understand other novel genes and molecular pathways, which contribute to the neurobiology of brain disorders. This may lead Our understanding of the genetic basis of neurological disorders has to new and better detection, prevention and treatment options in people grown rapidly in the last two decades. This has been accomplished large- of African ancestry and possibly by extension, other global populations ly by the ‘positional cloning’ research paradigm that utilizes linkage stud- particularly in the new paradigm of personalized precision medicine ies to localize specific genes on chromosomes and the subsequent [11,12]. identification of causative genes by targeted screening of Mendelian neu- In this article, we discuss the basis of African genomic variation and rological disorders [1,2]. However, most neurological disorders are poly- provide an overview of the status of knowledge on the genetics of neu- genic disorders with non–Mendelian inheritance. The clinical phenotype rological disorders in Africa (Fig. 1). We also highlight the current geno- is often the culmination of several complex processes and interacting mic revolution triggered by the H3Africa Initiative [13], identify pathways that involve genetic, epigenetic and environmental factors potential future gains in knowledge and suggest priorities for effective [3]. As such, the exact influence of genetic factors on neurological disor- translational genomics in Africa. ders varies giving rise to differing phenotypic manifestations. In monogenic neurological disorders e.g. Huntington's disease, 2. Perspectives on what is known spinocerebellar ataxias, patterns of inheritance which may be autosomal dominant or recessive, are easier to elucidate whereas the genetic contri- 2.1. African human genomic variation butions to polygenic neurological disorders such as stroke, Alzheimer's disease and the epilepsies may result from common variants with African populations harbor the broadest genomic diversity, lowest small effect sizes, rare variants with large effect sizes, or a combination levels and most divergent patterns of linkage disequilibrium, as well of both [4]. For populations in Africa, on the one hand there are some as smaller haplotype block sizes among the world's human population published studies exploring the genetic underpinnings of certain neuro- [9,14]. Studies of genomic variation in Africa suggest that the present logical disorders including Parkinson's disease, age-related dementias, pattern of variation within and between populations is a product of sev- and spinocerebellar ataxias while on the other hand there is barely any eral factors. These include demographic history, population structure, specific genetic knowledge on stroke, rare disorders or headache syn- diversities of geographical location, language classification and different dromes (Tables 1 and 2). Moreover, virtually all the available published patterns of subsistence, dietary differences, multiple migration with ac- data among Africans were derived from linkage analysis and limited can- companying high levels of genetic admixture and survival related to ex- didate gene studies with no published evidence of genome wide associ- posure to infectious diseases [15,16]. ation studies (GWAS) or next generation sequencing approaches. Tishkoff and colleagues [9] identified 14 ancestral population clus- It is not clear what proportion of the burden can be attributed to ge- ters in Africa with four predominant clusters that broadly represent netic transmission but current estimates show Africa bears a high burden populations from major African geographical regions and the four dom- of all cause neurological disorders. By 2010, all causes of neurological, inant African language families. These are Niger-Kordofanian spoken mental health and substance-use disorders including cerebrovascular primarily by agriculturalist populations located in large contiguous re- diseases and pain were estimated to account for more than 29% of the gions of sub-Saharan Africa (SSA) from West Africa to eastern and global burden of disease [5,6]. In tandem with increased life expectancy, southern Africa, Nilo-Saharan spoken predominantly by pastoralist pop- the global burden of disease has shifted from premature death to in- ulations in central and eastern Africa,
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