Fig. 5. Genetic regulation of protein expression mediated by mRNA.
A Two mediation models of protein expression: transcription-dependent protein regulation and transcription-independent protein regulation. B Scatter plot showing negative log-transformed p values of cis-pQTL before and after conditioning on mRNA. C Box and whisker plot showing Pearson correlation coefficient between expression levels of proteins and transcripts in both transcript-mediated and transcript-independent groups. The plot shows the mean (horizontal lines), 5th–95th percentile values (boxes), and SEM (whiskers). D Box and whisker plot showing effect sizes of transcription-dependent and transcription-independent regulations. E An example of transcription-dependent regulation is exemplified by TRPV2. LocusZoom plots show a significant localization of cis-pQTL (top) and cis-eQTL (bottom). The inset shows the scatter plot of a high correlation (r = 0.70) between the expression of gene and protein. F Transcription-independent regulation is exemplified by GLRX5. LocusZoom plots show a significant cis-pQTL but not a cis-eQTL. The inset shows the scatter plot of a low correlation (r = 0.10) of GLRX5 expression levels between gene and protein.