Reproducibility of genotypes as measured by the affymetrix GeneChip® 100K Human Mapping Array set

Brooke L. Fridley, Stephen T. Turner, Arlene B. Chapman, Andrei S. Rodin, Eric Boerwinkle, Kent R. Bailey

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Genotyping errors that are undetected in genome-wide association studies using single nucleotide polymorphisms (SNPs) may degrade the likelihood of detecting true positive associations. To estimate the frequency of genotyping errors and assess the reproducibility of genotype calls, we analyzed two sets of duplicate data, one dataset containing twenty blind duplicates and another dataset containing twenty-eight nonrandom duplicates, from a genome-wide association study using Affymetrix GeneChip®100 K Human Mapping Arrays. For the twenty blind duplicates the overall agreement in genotyping calls as measured with the Kappa statistics, was 0.997, with a discordancy rate of 0.27%. For the twenty-eight nonrandom duplicates, the overall agreement was lower, 0.95, with a higher discordancy rate of 4.53%. The accuracy and probability of concordancy were inversely related to the genotyping uncertainty score, i.e., as the genotyping uncertainty score increased, the concordancy and probability of concordant calls decreased. Lowering of the uncertainty score threshold for rejection of genotype calls from the Affymetrix recommended value of 0.25 to 0.20 resulted in an increased predicted accuracy from 92.6% to 95% with a slight increase in the "No Call" rate from 1.81% to 2.33%. Hence, we suggest using a lower uncertainty score threshold, say 0.20, which will result in higher accuracy in calls at a modest decrease in the call rate.

Original languageEnglish (US)
Pages (from-to)5367-5374
Number of pages8
JournalComputational Statistics and Data Analysis
Issue number12
StatePublished - Aug 15 2008

ASJC Scopus subject areas

  • Statistics and Probability
  • Computational Mathematics
  • Computational Theory and Mathematics
  • Applied Mathematics


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