SUMO4 and transient neonatal diabetes mellitus: IDDM 1 (6q21) IDDM5 (6q24-27), IDDM8 (6q25-27), IDDM15, transient neonatal diabetes mellitus (6q24), pleomorphic adenoma gene-like 1 (6q24-26), phosphodiesterase 1 (6q22-23)