TBX5 ChIP from the Fetal Heart

T-box transcription factors play critical roles in the development and identity of the heart. Tbx5 has been implicated as a regulator of the fast-conducting, ventricular conduction system, while Tbx3 has been implicated as a regulator of the slow-conducting node. We hypothesize TBX5 and TBX3 share common binding sites in cardiomyocytes to positively or negatively regulate transcription, respectively, for cardiac cell identity and conduction. To this end, we performed ChIP-sequencing to identify localization of TBX5 during fetal heart development and have compared it with previously published histone (GEO Series: GSE31039; ENCODE Accessions: ENCSR080GQM, ENCSR000CDL, ENCSR000CDM, ENCSR052CDF, ENCSR345RKE, ENCSR007XTC, ENCSR360ANE, ENCSR000CDK, and ENCSR357OED) and TBX3 ChIP-seq (GSM862695). Overall design: Hearts were dissected from E14.5 CD-1 mouse embryos. Two biological replicates were generated. For immunoprecipitation, the chromatin extract was incubated with 5ug of the anti-TBX5 antibody (Santa Cruz Biotechnology sc-17866; Lot #G1516) at 4°C for >12 hours in a total volume of 200 µL. Libraries from ChIP and input DNA were prepared using NEBNext Ultra DNA Library Prep Kit (E7370S). During library preparation, adaptor-ligated DNA fragments of 200-650 bp in size were selected before PCR amplification using Sera-Mag magnetic beads (GE, 6515-2105-050-250). DNA libraries were sequenced using Illumina Hi-seq instruments (single-end 50 base) by the Genomics Core Facility at the University of Chicago.