Table 1.

Rare Epilepsy Network (REN) registry by rare syndrome and number of patients participating in the registry.

Syndrome	No.	Syndrome	No.
Aicardi syndrome	100	Ohtahara syndrome	18
Angelman syndrome	5	PCDH19 female epilepsy	41
Batten disease	3	Phelan–McDermid syndrome	43
CDKL5 disorder	32	Progressive myoclonic epilepsy (PME)	8
Congenital bilateral perisylvian syndrome	2	RAS pathway disorders	1
CSWS/ESES	17	Rasmussen's encephalopathy	5
Doose syndrome	76	Rett syndrome	1
Dravet syndrome	177	Ring 14 syndrome	8
Dup15q syndrome	62	Ring 20 syndrome	4
Early myoclonic encephalopathy	1	Severe myoclonic epilepsy of infancy	7
Glut1 deficiency	4	SCN2A mutation	4
Hypothalamic hamartomas	91	SCN8A mutation	25
Infantile spasms/West syndrome	67	SLC13A5 mutation	3
Jeavon's syndrome	9	Sturge Weber syndrome	1
KCNQ2 mutation	9	SYNGAP1 mutation	18
Landau–Kleffner syndrome	10	Tuberous sclerosis complex	256
Lennox–Gastaut syndrome	207	Unverricht-Lundborg syndrome	3
Lissencephaly	4	Encephalopathy with seizures and major delay in development	23
MERFF	3	Other mutation associated with seizures	110
Mitochondrial disorders (Alper's disease, Leigh's disease)	1	Total	1459