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                  Biological Magnetic Resonance Data BankA Repository for Data from NMR Spectroscopy on Proteins, Peptides, Nucleic Acids, and other Biomolecules  | 
                
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	Long QT syndrome (LQTS) is a disorder of the heart's electrical activity. It can cause sudden, uncontrollable, dangerous arrhythmias (ah-RITH-me-ahs) in response to exercise or stress. Arrhythmias are problems with the rate or rhythm of the heartbeat.
| Gene Name | Chromosome number | 
|---|---|
| ANK2 | 4 | 
| SCN5A | 3 | 
| KCNH2 | 7 | 
| SCN4B | 11 | 
| KCNQ1 | 11 | 
| KCNJ2 | 17 | 
| SNTA1 | 202 | 
| KCNE1 | 21 | 
| KCNE2 > | 21 |