African KhoeSan ancestry linked to high-risk prostate cancer

dc.contributor.authorPetersen, Desiree C.en_ZA
dc.contributor.authorJaratlerdsiri, Weerachaien_ZA
dc.contributor.authorVan Wyk, Abrahamen_ZA
dc.contributor.authorChan, Eva K. F.en_ZA
dc.contributor.authorFernandez, Pedroen_ZA
dc.contributor.authorLyons, Ruth J.en_ZA
dc.contributor.authorMutambirw, Shingai B. A.en_ZA
dc.contributor.authorVan der Merwe, Andreen_ZA
dc.contributor.authorVenter, Philip A.en_ZA
dc.contributor.authorBates, Williamen_ZA
dc.contributor.authorBornman, M. S. R.en_ZA
dc.contributor.authorHayes, Vanessa M.en_ZA
dc.identifier.citationPetersen, D. C., et al. 2019. African KhoeSan ancestry linked to high-risk prostate cancer. BMC Medical Genomics, 12:82, doi:10.1186/s12920-019-0537-0
dc.identifier.issn1755-8794 (online)
dc.descriptionCITATION: Petersen, D. C., et al. 2019. African KhoeSan ancestry linked to high-risk prostate cancer. BMC Medical Genomics, 12:82, doi:10.1186/s12920-019-0537-0.
dc.descriptionThe original publication is available at
dc.description.abstractBackgrounds: Genetic diversity is greatest within Africa, in particular the KhoeSan click-speaking peoples of southern Africa. South African populations represent admixture fractions including differing degrees of African, African-KhoeSan and non-African genetic ancestries. Within the United States, African ancestry has been linked to prostate cancer presentation and mortality. Together with environmental contributions, genetics is a significant risk factor for high-risk prostate cancer, defined by a pathological Gleason score ≥ 8. Methods: Using genotype array data merged with ancestry informative reference data, we investigate the contribution of African ancestral fractions to high-risk prostate cancer. Our study includes 152 South African men of African (Black) or African-admixed (Coloured) ancestries, in which 40% showed high-risk prostate cancer. Results: Genetic fractions were determined for averaging an equal African to non-African genetic ancestral contribution in the Coloured; we found African ancestry to be linked to high-risk prostate cancer (P-value = 0.0477). Adjusting for age, the associated African ancestral fraction was driven by a significant KhoeSan over Bantu contribution, defined by Gleason score ≥ 8 (P-value = 0.02329) or prostate specific antigen levels ≥20 ng/ml (Pvalue = 0.03713). Additionally, we observed the mean overall KhoeSan contribution to be increased in Black patients with high-risk (11.8%) over low-risk (10.9%) disease. Linking for the first time KhoeSan ancestry to a common modern disease, namely high-risk prostate cancer, we tested in this small study the validity of using KhoeSan ancestry as a surrogate for identifying potential high-risk prostate cancer risk loci. As such, we identified four loci within chromosomal regions 2p11.2, 3p14, 8q23 and 22q13.2 (P-value = all age-adjusted < 0.01), two of which have previously been associated with high-risk prostate cancer. Conclusions: Our study suggests that ancient KhoeSan ancestry may be linked to common modern diseases, specifically those of late onset and therefore unlikely to have undergone exclusive selective pressure. As such we show within a uniquely admixed South African population a link between KhoeSan ancestry and high-risk prostate cancer, which may explain the 2-fold increase in presentation in Black South Africans compared with African Americans.
dc.format.extent7 pagesen_ZA
dc.publisherBMC (part of Springer Nature)en_ZA
dc.subjectAfrican ancestryen_ZA
dc.subjectKxoe (African people)en_ZA
dc.subjectProstate -- Canceren_ZA
dc.titleAfrican KhoeSan ancestry linked to high-risk prostate canceren_ZA
dc.description.versionPublisher's version
dc.rights.holderAuthors retain copyrighten_ZA

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