Megalencephalic Leukoencephalopathy with Subcortical Cysts 4, Remitting, is also known as leukoencephalopathy, megalencephalic, with subcortical cysts, type 4, remitting. An important gene associated with Megalencephalic Leukoencephalopathy with Subcortical Cysts 4, Remitting is AQP4 (Aquaporin 4). Affiliated tissues include brain.