| Type |
OMIM |
Mutation |
Notes
|-
| B1 |
|
alpha subunit of the sodium channel (SCN5A) |
Current through this channel is commonly referred to as INa. Gain of this channel leads to an unopposed Ito current (KCND2)
|-
| B2 |
|
GPD1L, Glycerol-3-phosphate dehydrogenase like peptide |
|-
| B3 |
|
CACNA1C |
|-
| B4 |
|
CACNB2 |
Beta-2 subnit of the voltage dependent L-type calcium channel
|-
| B5 |
|
KCNE3 which coassembles with KCND2 |
Beta subunit to KCND2. Modulates the Ito potassium outward current[5]
|-
| B6 |
|
SCN1B |
Beta-2 subunit of the sodium channel SCN5A[6] |