Any ventricular septal defect in which the cause of the disease is a mutation in the GATA4 gene. The disease is ventricular septal defect 1 (MONDO_0013746, a Monarch Disease Ontology entry). Also known as: GATA4 ventricular septal defect (disease), ventricular septal defect (disease) caused by mutation in GATA4, ventricular septal defect type 1.