COL18A1 and ventricular fibrillation: Cluster 3 was also shown to be regulated by CACNA1C in SF, a gene involved in calcium channels and associated with inherited cardiac arrhythmia (Kawashiri et al., 2014), and COL18A1 in VF, that may control angiogenesis and vascular permeability (Moulton et al., 1999).