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Splicing QTL analysis focusing on coding sequences reveals pathogenicity of disease susceptibility loci.

Yamaguchi, K.; Ishigaki, K.; Suzuki, A.; Tsuchida, Y.; Tsuchiya, H.; Sumitomo, S.; Nagafuchi, Y.; Miya, F.; Tsunoda, T.; Hirofumi, S.; Fujio, K.; Yamamoto, K.; Kochi, Y.

2022-01-03 genetics
10.1101/2021.12.30.474578 bioRxiv
Show abstract

Splicing QTL (sQTL) are one of the major causal mechanisms in GWAS loci, but their role in disease pathogenesis is poorly understood. One reason is the huge complexity of alternative splicing events producing many unknown isoforms. Here, we proposed two novel approaches, namely integration and selection, for this complexity by focusing on protein-structure of isoforms. First, we integrated isoforms with the same coding sequence (CDS) and identified 369-601 integrated-isoform ratio QTLs (i2-rQTLs), which altered protein-structure, in six immune subsets. Second, we selected CDS incomplete isoforms annotated in GENCODE and identified 175-337 isoform-ratio QTL (i-rQTL). By comprehensive long-read capture RNA-seq among these incomplete isoforms, we revealed 29 full-length isoforms with novel CDSs associated with GWAS traits. Furthermore, we have shown that disease-causal sQTL genes can be identified by evaluating their trans-eQTL effects. Our approaches highlight the understudied role of protein-altering sQTLs and are broadly applicable to other tissues and diseases.

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