COL4A3 and Andersen-Tawil syndrome: The existence of an AD form of ATS (ADAS) distinct from the thin basement membrane nephropathy (TBMN) is sometime debated; however, already in 2000, van der Loop and colleagues provided convincing evidence in favor of the existence of ADAS, identifying a heterozygous mutation in the COL4A3 gene in a large ATS family from Northern Ireland [11].