ALG9 and congenital disorder of glycosylation: Apart from above mentioned CDG types connected with special forms of epileptic encephalopathies also in other CDG types epilepsy may be difficult to treat for example: ALG2-CDG, ALG8-CDG, ALG9-CDG, ALG12-CDG, DPM1-CDG, MPDU1-CDG, DPAGT1-CDG [1,2,3,4,5,6,119,120,121].