Kirsten E Lyke

Publication Detail

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Genome-wide and fine-resolution association analysis of malaria in West Africa.

Muminatou Jallow; Yik Ying Teo; Kerrin S Small; Kirk A Rockett; Panos Deloukas; Taane G Clark; Katja Kivinen; Kalifa A Bojang; David J Conway; Margaret Pinder; et al. (Profiled Author: Christopher Plowe)

MRC Laboratories, Fajara, Banjul, Gambia.
Nature genetics 2009;41(6):657-65.

We report a genome-wide association (GWA) study of severe malaria in The Gambia. The initial GWA scan included 2,500 children genotyped on the Affymetrix 500K GeneChip, and a replication study included 3,400 children. We used this to examine the performance of GWA methods in Africa. We found considerable population stratification, and also that signals of association at known malaria resistance loci were greatly attenuated owing to weak linkage disequilibrium (LD). To investigate possible solutions to the problem of low LD, we focused on the HbS locus, sequencing this region of the genome in 62 Gambian individuals and then using these data to conduct multipoint imputation in the GWA samples. This increased the signal of association, from P = 4 × 10(-7) to P = 4 × 10(-14), with the peak of the signal located precisely at the HbS causal variant. Our findings provide proof of principle that fine-resolution multipoint imputation, based on population-specific sequencing data, can substantially boost authentic GWA signals and enable fine mapping of causal variants in African populations.

2 Originating Grant

• 1.

  PLOWE, CHRISTOPHER V.

  Genetic diversity and protective immunity to malaria infection and disease

  1 September 2005 - 30 June 2015

  NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES

• 2.

  Plowe, Christopher V

  Malaria Vaccine Trials in Mali

  1 September 2005 - 30 April 2010

  NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES

Scientific Context

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