A rapid epistatic mixed-model association analysis by linear retransformations of genomic estimated values.

A rapid epistatic mixed-model association analysis by linear retransformations of genomic estimated values.
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DOI:
10.1093/bioinformatics/bty017
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发表时间:
2018-06-01
期刊:
Bioinformatics (Oxford, England)
影响因子:
--
通讯作者:
Liu JF
Liu JF
中科院分区:
其他
文献类型:
--
作者:
Ning C;Wang D;Kang H;Mrode R;Zhou L;Xu S;Liu JF

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Epistasis provides a feasible way for probing potential genetic mechanism of complex traits. However, time-consuming computation challenges successful detection of interaction in practice, especially when linear mixed model (LMM) is used to control type I error in the presence of population structure and cryptic relatedness. A rapid epistatic mixed-model association analysis (REMMA) method was developed to overcome computational limitation. This method first estimates individuals’ epistatic effects by an extended genomic best linear unbiased prediction (EG-BLUP) model with additive and epistatic kinship matrix, then pairwise interaction effects are obtained by linear retransformations of individuals’ epistatic effects. Simulation studies showed that REMMA could control type I error and increase statistical power in detecting epistatic QTNs in comparison with existing LMM-based FaST-LMM. We applied REMMA to two real datasets, a mouse dataset and the Wellcome Trust Case Control Consortium (WTCCC) data. Application to the mouse data further confirmed the performance of REMMA in controlling type I error. For the WTCCC data, we found most epistatic QTNs for type 1 diabetes (T1D) located in a major histocompatibility complex (MHC) region, from which a large interacting network with 12 hub genes (interacting with ten or more genes) was established. Our REMMA method can be freely accessed at https://github.com/chaoning/REMMA. Supplementary data are available at Bioinformatics online.
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