title: Haplotype sharing analysis using mantel statistics.
abstract: OBJECTIVE
  The potential value of haplotypes has attracted widespread interest in the mapping of complex traits. Haplotype sharing methods take the linkage disequilibrium information between multiple markers into account, and may have good power to detect predisposing genes. We present a new approach based on Mantel statistics for spacetime clustering, which is developed in order to improve the power of haplotype sharing analysis for gene mapping in complex disease.
  
  
  METHODS
  The new statistic correlates genetic similarity and phenotypic similarity across pairs of haplotypes for case-only and case-control studies. The genetic similarity is measured as the shared length between haplotypes around a putative disease locus. The phenotypic similarity is measured as the mean-corrected cross-product based on the respective phenotypes. We analyzed two tests for statistical significance with respect to type I error: (1) assuming asymptotic normality, and (2) using a Monte Carlo permutation procedure. The results were compared to the chi(2) test for association based on 3-marker haplotypes.
  
  
  RESULTS
  The results of the type I error rates for the Mantel statistics using the permutational procedure yielded pointwise valid tests. The approach based on the assumption of asymptotic normality was seriously liberal.
  
  
  CONCLUSIONS
  Power comparisons showed that the Mantel statistics were better than or equal to the chi(2) test for all simulated disease models.
authors.affiliation: German Cancer Research Center DKFZ, DE-69120 Heidelberg, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Beckmann
authors.forename: D C
authors.initials: DC
authors.lastname: Thomas
authors.forename: C
authors.initials: C
authors.lastname: Fischer
authors.forename: J
authors.initials: J
authors.lastname: Chang-Claude
mesh_terms: D016022:Case-Control Studies; D030342:Genetic Diseases, Inborn / Q000235:genetics*; D005819:Genetic Markers; D006239:Haplotypes; D006801:Humans; D008957:Models, Genetic; D015233:Models, Statistical; D009010:Monte Carlo Method
chemical_list: D005819:Genetic Markers