Project description:Purpose: Endothelial cell-specific knockout of the INO80 chromatin-remodeling complex in developing mouse embryos results in defective coronary angiogenesis. Transcriptome analysis on whole hearts was performed to understand how Ino80 regulates the genome to influence angiogenesis. Methods: mRNA was extracted from whole hearts after surgical removal from embryonic day 13.5 mice, either WT or Tie2-Ino80 KO, and prepped for Illumina sequencing using the NEBNext Ultra RNA Library Prep kit. Results: Deletion of Ino80 in the two major coronary progenetiors results in intermediate non-compaction phenotypes and an increase in E2F-mediated gene expression and cellular proliferation. Conclusions: Ino80 normally functions to suppress E2F-mediated proliferation in cardiac endothelial cells in order to promote productive angiogenesis and prevent underdevelopment of the myocardium heart muscle. Loss of this critical chromatin-remodeling function results in human disease phenotypes. Overall design: mRNA profiles from embryonic day E13.5 mice were generated from WT or Tie2-Ino80-KO whole hearts using deep sequencing with three biological replicates for each. An average of 33.9M and 53.5M reads per replicate were included in the final analysis for the WT and KO samples, respectively.
Project description:The present study focuses on the identification of differentially regulated microRNAs in Calsarcin-1 knockout mice, which shows dilated cardiomyopathy phenotype. Overall design: Total RNA was isolated from hearts of Calsarcin-1 knockout and wild-type mice (4x each) was used to identify the differentially regulated microRNA between the genotypes using Illumina mouse Sentrix Beadchip platform. Differentially regulated microRNAs were identified by calculating the standard deviation differences of a given probe in Cs1-ko vs WT mice comparison.
Project description:Slc39a8 KO mouse embryo hearts exhibit ventricle noncompaction phenotype which becomes evident at E12.5. The goal of this experiment is to identify genes that are differentially expressed between Slc39a8 KO and WT, which may be underlying the phenotype. Overall design: Whole heart was isolated from E12.5 mouse embryo, RNA was extracted and microarray was performed. N=4
Project description:Ventricular chambers are essential for the rhythmic contraction and relaxation that occurs in every hearbeat throughout life. Congenital abnormalities in ventricular chamber formation cause severe human heart defects. How the early trabecular meshwork of myocardial fibres forms and subsequently develops into mature chambers is still poorly understood. Here we show that Notch signalling first connects chamber endocardium and myocardium to sustain trabeculation and later coordinates ventricular patterning and compaction with coronary vessel development to give rise to the mature chamber via a temporal sequence of ligand signalling determined by the glycosyltransferase Manic Fringe (Mfng). The early endocardial expression of Mfng favours Dll4-Notch1 signalling, Which induces trabeculation in the developing ventricle.Ventricular maturation and compaction in turn require Mfng and Dll4 downregulation in the endocardium, Which allows myocardial Jag1- And Jag2- Signalling to Notch1 in this tissue.Timely and spatial perturbation of this signalling equilibrium severely disrupts heart chamber formation. Our results open a new research avenue into the pathogenesis of cardiomyopathies. Dll4 and Notch1 conditional KOs using Nfact1 and/or Tie2 driven Cre expression: RNA was isolated from pooled whole hearts of 8 (Nfact1) or 9 (Tie2) E9.5 embryos per replicate. Dll4flox;Nfatc1-Cre and WT siblings (4 KO and 4 WT replicates), Notch1flox;Nfatc1-Cre and WT siblings (3 KO and 2 WT replicates), Dll4flox;Tie2-Cre and WT siblings (3 KO and 3 WT replicates). Jag1, Jag2 and Jag1Jag2 conditional KOs using cTnT driven Cre expression: RNA was isolated from pooled heart ventricles of 4 E15.5 embryos per replicate. Jag1flox;cTnT-Cre and WT siblings (3 KO and 3 WT replicates), Jag2flox;cTnT-Cre and WT siblings (3 KO and 2 WT replicates). Jag1flox;jag2flox;cTnT-Cre and WT siblings (3 KO and 2 WT replicates). MFng Gain Of Function using Tie2 driven Cre expression: RNA was isolated from pooled heart ventricles of 4 E15.5 embryos per replicate. MFng;Tie2-Cre and WT siblings (4 GOF and 4 WT replicates). For Dll4, Noth1 and Jag1 KOs, libraries were prepared using the standard Illumina TrueSeq RNASeq library preparation kit and sequenced in a GAIIx Illumina sequencer using a 75bp single end elongation protocol. For Jag2 and Jag1Jag2 KOs and MFng GOF libraries were prepared prepared using the NEBNext Ultra RNA Library Prep Kit for Illumina and sequenced in a HiSeq2500 Illumina sequencer using a 61bp single end elongation protocol