The integration of genetically-regulated transcriptomics and electronic health records highlights a pattern of medical outcomes related to increased hepaticTransthyretinexpression

AbstractBackgroundTransthyretin (TTR) is a multi-function protein involved in the systemic transport of retinol and thyroxine. It also participates in the neuronal response to stress and proteolysis of few specific substrates. TTR is also the precursor of the fibrils that compromise organ function in the familial and sporadic systemic amyloidoses (ATTR). RNA-interference and anti-sense therapeutics targetingTTRhepatic transcription have been shown to reduce TTR amyloid formation. The goal of our study was to investigate the role of genetic regulation ofTTRtranscriptomic variation in human traits and diseases.Methods and FindingsWe leveraged genetic and phenotypic information from the UK Biobank and transcriptomic profiles from the GTEx (Genotype-Tissue Expression) project to test the association of genetically regulatedTTRgene expression with 7,149 traits assessed in 420,531 individuals. We conducted a joint multi-tissue analysis ofTTRtranscription regulation and identified an association with a specific operational procedure related to secondary open reduction of fracture of bone (p=5.46×10−6, false discovery rate q=0.039). Using tissue-specificTTR cisexpression quantitative trait loci, we demonstrated that the association is driven by the genetic regulation ofTTRhepatic expression (odds ratio [OR] = 3.46, 95% confidence interval [CI] = 1.85-6.44, p = 9.51×10−5). Although there is an established relationship of retinol and thyroxine abnormalities with bone loss and the risk of bone fracture, this is the first evidence of a possible effect ofTTRtranscriptomic regulation. Investigating the UK Biobank electronic health records available, we investigated the comorbidities affecting individuals undergoing the specific surgical procedure. Excluding medical codes related to bone fracture events, we identified a pattern of health outcomes that have been previously associated with ATTR manifestations. These included osteoarthritis (OR=3.18, 95%CI=1.93-4.25, p=9.18×10−8), carpal tunnel syndrome (OR=2.15, 95%CI=1.33-3.48, p=0.002), and a history of gastrointestinal diseases (OR=2.01, 95%CI=1.33-3.01, p=8.07×10−4).ConclusionsThe present study supports the notion thatTTRhepatic expression can affect health outcomes linked to physiological and pathological processes presumably related to the encoded protein. Our findings highlight how the integration of omics information and electronic health records can successfully dissect the complexity of multi-function proteins such as TTR.