In fact, it was initially thought that mutations of the Cx43 gene, GJA1, would be lethal, given its importance for cardiac function; however autosomal dominant mutations in GJA1 were recently linked to oculodentodigital dysplasia (ODDD), a developmental disorder with some myocardial implications (Paznekas et al., 2003; Laird, 2008). The gene discussed is GJA1; the disease is oculodentodigital dysplasia.