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Using case‐control designs for genome‐wide screening for associations between genetic markers and disease susceptibility loci

We used a case‐control design to scan the genome for any associations between genetic markers and disease susceptibility loci using the first two replicates of the Mycenaean population from the GAW11 (Problem 2) data. Using a case‐control approach, we constructed a series of 2‐by‐3 tables for each allele of every marker on all six chromosomes. Odds ratios (ORs) and 95% confidence intervals (95% CI) were estimated for all alleles of every marker. We selected the one allele for which the estimated OR had the minimum p‐value to plot in the graph. Among these selected ORs, we calculated 95% CI for those that had a p‐value ≤ adjusted α level. Significantly high ORs were taken to indicate an association between a marker locus and a suspected disease‐susceptibility gene. For the Mycenaean population, the case‐control design identified allele number 1 of marker 24 on chromosome 1 to be associated with a disease susceptibility gene, OR = 2.10 (95% CI 1.66–2.62). Our approach failed to show any other significant association between case‐control status and genetic markers. Stratified analysis on the environmental risk factor (E1) provided no further evidence of significant association other than allele 1 of marker 24 on chromosome 1. These data indicate the absence of linkage disequilibrium for markers flanking loci A, B, and C.