Maturity-onset diabetes of the young caused by a balanced translocation where the 20q12 break point results in disruption upstream of the coding region of hepatocyte nuclear factor-4alpha (HNF4A) gene. - Gloyn, A; Ellard, S; Shepherd, M; Howell, RT; Parry, E; Jefferson, A; Levy, E; Hattersley, A (Diabetes, 2002)