Hearing loss in Africa: current genetic profile

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dc.contributor.authorAdadey, Samuel Mawuli
dc.contributor.authorWonkam‑Tingang, Edmond
dc.contributor.authorAboagye, Elvis Twumas
dc.date.accessioned2023-04-22T14:17:47Z
dc.date.available2023-04-22T14:17:47Z
dc.date.issued2021-10-05
dc.description.abstractHearing impairment (HI) is highly heterogeneous with over 123 associated genes reported to date, mostly from studies among Europeans and Asians. Here, we performed a systematic review of literature on the genetic profile of HI in Africa. The study protocol was registered on PROSPERO, International Prospective Register of Systematic Reviews with the registration number “CRD42021240852”. Literature search was conducted on PubMed, Scopus, Africa-Wide Information, and Web of Science databases. A total of 89 full-text records was selected and retrieved for data extraction and analyses. We found reports from only 17/54 (31.5%) African countries. The majority (61/89; 68.5%) of articles were from North Africa, with few reports found from sub-Saharan Africa. The most common method used in these publications was targeted gene sequencing (n=66/111; 59.5%), and only 13.5% (n=15/111) used whole-exome sequencing. More than half of the studies were performed in families segregating HI (n=51/89). GJB2 was the most investigated gene, with GJB2: p.(R143W) founder variant only reported in Ghana, while GJB2: c.35delG was common in North African countries. Variants in MYO15A were the second frequently reported in both North and Central Africa, followed by ATP6V1B1 only reported from North Africa. Usher syndrome was the main syndromic HI molecularly investigated, with variants in five genes reported: USH2A, USH1G, USH1C, MYO7A, and PCDH15. MYO7A: p.(P1780S) founder variant was reported as the common Usher syndrome variant among Black South Africans. This review provides the most comprehensive data on HI gene variants in the largely under investigated African populations. Future exomes studies particularly in multiplex families will likely provide opportunities for the discovery of the next sets of novel HI genes, and well as unreported variants in known genes to further our understanding of HI pathobiology, globally.en_US
dc.description.sponsorshipACE: Cell Biology of Infectious and Non-Communicable Diseasesen_US
dc.identifier.citationhttps://doi.org/10.1007/s00439-021-02376-yen_US
dc.identifier.issn0340-6717
dc.identifier.urihttps://datad.aau.org/handle/123456789/1528
dc.language.isoenen_US
dc.publisherSpingeren_US
dc.relation.ispartofseriesHuman Genetics;(2022) 141
dc.subjectWACCBIPen_US
dc.subjectOsbourne Quayeen_US
dc.subjectGordon A. Awandareen_US
dc.subjectAmbroise Wonkamen_US
dc.subjectHI pathobiologyen_US
dc.subjectHI genesen_US
dc.titleHearing loss in Africa: current genetic profileen_US
dc.typeArticleen_US
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