Rare Variants Association Analysis in Large-Scale Sequencing Studies at the Single Locus Level

Xinge Jessie Jeng, Zhongyin John Daye, Wenbin Lu, Jung Ying Tzeng

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

Genetic association analyses of rare variants in next-generation sequencing (NGS) studies are fundamentally challenging due to the presence of a very large number of candidate variants at extremely low minor allele frequencies. Recent developments often focus on pooling multiple variants to provide association analysis at the gene instead of the locus level. Nonetheless, pinpointing individual variants is a critical goal for genomic researches as such information can facilitate the precise delineation of molecular mechanisms and functions of genetic factors on diseases. Due to the extreme rarity of mutations and high-dimensionality, significances of causal variants cannot easily stand out from those of noncausal ones. Consequently, standard false-positive control procedures, such as the Bonferroni and false discovery rate (FDR), are often impractical to apply, as a majority of the causal variants can only be identified along with a few but unknown number of noncausal variants. To provide informative analysis of individual variants in large-scale sequencing studies, we propose the Adaptive False-Negative Control (AFNC) procedure that can include a large proportion of causal variants with high confidence by introducing a novel statistical inquiry to determine those variants that can be confidently dispatched as noncausal. The AFNC provides a general framework that can accommodate for a variety of models and significance tests. The procedure is computationally efficient and can adapt to the underlying proportion of causal variants and quality of significance rankings. Extensive simulation studies across a plethora of scenarios demonstrate that the AFNC is advantageous for identifying individual rare variants, whereas the Bonferroni and FDR are exceedingly over-conservative for rare variants association studies. In the analyses of the CoLaus dataset, AFNC has identified individual variants most responsible for gene-level significances. Moreover, single-variant results using the AFNC have been successfully applied to infer related genes with annotation information.

原文English
文章編號e1004993
期刊PLoS computational biology
12
發行號6
DOIs
出版狀態Published - 2016 六月

All Science Journal Classification (ASJC) codes

  • 生態學、進化論、行為學與系統學
  • 建模與模擬
  • 生態學
  • 分子生物學
  • 遺傳學
  • 細胞與分子神經科學
  • 計算機理論與數學

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