Family based association studies are employed less often than case-control designs in the search for disease-predisposing genes. The optimal statistical genetic approach for complex pedigrees is unclear when evaluating both common and rare variants. We examined the empirical power and type I error rates of 2 common approaches, the measured genotype approach and family-based association testing, through simulations from a set of multigenerational pedigrees. Overall, these results suggest that much larger sample sizes will be required for family-based studies and that power was better using MGA compared to FBAT. Taking into account computational time and potential bias, a 2-step strategy is recommended with FBAT followed by MGA.
|State||Published - Jun 17 2014|
Bibliographical noteFunding Information:
We are grateful to Dr. Patrick Breheny for useful discussion and the anonymous reviewers whose suggestions improved the manuscript. This work was supported in part by NIH grants 8P20GM103436-12 (DWF, KN), K25AG043546 (DWF), NS36695 (LD, LJM), AI070235 (HH, LJM, TBM), AI066738 (LJM), HL111459 (LJM, VP), T32-ES10957 (ESA), K12 HD001097-16 (BGK), K01HL103165 (TBM). The GAW18 whole genome sequence data were provided by the T2D-GENES Consortium, which is supported by NIH grants U01 DK085524, U01 DK085584, U01 DK085501, U01 DK085526, and U01 DK085545. The other genetic and phenotypic data for GAW18 were provided by the San Antonio Family Heart Study and San Antonio Family Diabetes/Gallbladder Study, which are supported by NIH grants P01 HL045222, R01 DK047482, and R01 DK053889. The Genetic Analysis Workshop is supported by NIH grant R01 GM031575. This article has been published as part of BMC Proceedings Volume 8 Supplement 1, 2014: Genetic Analysis Workshop 18. The full contents of the supplement are available online at http://www.biomedcentral.com/bmcproc/ supplements/8/S1. Publication charges for this supplement were funded by the Texas Biomedical Research Institute.
© 2014 Fardo et al.; licensee BioMed Central Ltd.
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology (all)