BioProject

Aims Arrhythmogenic cardiomyopathy (ACM) is an inherited cardiac disorder that is characterized by progressive fibro-fatty replacement of the myocardium, arrhythmias, and sudden death. More...

Aims Arrhythmogenic cardiomyopathy (ACM) is an inherited cardiac disorder that is characterized by progressive fibro-fatty replacement of the myocardium, arrhythmias, and sudden death. While myocardial degeneration and fibro-fatty replacement occurs in specific locations, the underlying molecular changes remain poorly characterized. Here we aim to delineate local changes in gene expression to help identify new genes or pathways that are relevant for specific remodelling processes occurring during ACM. Methods and Results Using Tomo-Seq, a genome-wide transcriptional profiling with high spatial resolution, we created a transmural epicardial to endocardial gene expression atlas of an explanted ACM heart to gain molecular insights into disease-driving processes. This enabled us to link gene expression profiles to the different regional remodelling responses and allowed us to identify genes that are potentially relevant for disease progression. In doing we revealed BTB (broad-complex, tramtrack, bric-à-brac) domain containing 11 (ZBTB11) to be specifically enriched at sites of active fibrofatty replacement of myocardium. Immunohistochemistry indicated ZBTB11 to be enriched in cardiomyocytes flanking fibrofatty areas, which could be confirmed in multiple cardiomyopathy patients. Forced overexpression of ZBTB11 in iPS-derived cardiomyocytes showed ZBTB11 to function as a potent inducer of cardiomyocyte atrophy. Conclusion By combining spatial transcriptomics with classical histological approaches we identified gene expression changes underlying local remodelling responses in ACM. In doing so we found ZBTB11 to function as a relevant driver of cardiomyocyte atrophy. These data show the power of Tomo-Seq to unveil new molecular mechanisms and indicate ZBTB11 as a potential new target for cardiomyopathy. Overall design: The dataset contains the following experiments: 1. Spatial transcriptomics by RNA-tomography (TomoSeq) on 20um sections on diseased heart. After isolation, we cryosectioned samples, extracted RNA from the individual sections, and amplified and barcoded mRNA using the CEL-seq protocol as in (Junker 2014, PMID: 25417113). Libraries were sequenced on Illumina NextSeq 500 using 75p paired end sequencing. 2. Bulk RNA-seq processed by the CEL-seq protocol. IPS derived cardiomyocytes were transduced with AAV-ZBTB11, AAV-GFP, or not transduced. 7 days after transduction, cells were harvested and RNA-Seq was performed. RNA-Seq on nontransduced control, AAV-GFP transduced and AAV-ZBTB11 transduced iPS derived cardiomyocytes. Less...