| First Author | Drici MD | Year | 1998 |
| Journal | Circ Res | Volume | 83 |
| Issue | 1 | Pages | 95-102 |
| PubMed ID | 9670922 | Mgi Jnum | J:114194 |
| Mgi Id | MGI:3688481 | Doi | 10.1161/01.res.83.1.95 |
| Citation | Drici MD, et al. (1998) Involvement of IsK-associated K+ channel in heart rate control of repolarization in a murine engineered model of Jervell and Lange-Nielsen syndrome. Circ Res 83(1):95-102 |
| abstractText | The Jervell and Lange-Nielsen (JLN) syndrome affects the human cardioauditory system, associating a profound bilateral deafness with an abnormally long QT interval on the ECG. It results from mutations in KVLQT1 and ISK genes that encode the 2 subunits forming the K+ channel responsible for the cardiac and inner ear slowly activating component of the delayed rectifier K+ current (IKs). A JLN mouse model that presents typical inner ear defects has been created by knocking out the isk gene (isk-/-). This study specifically reports on the cardiac phenotype counterpart, determined in the whole animal and at mRNAs and cellular levels. Surface ECG recordings of isk-/- mice showed a longer QT interval at slow heart rates, a paradoxical shorter QT interval at fast heart rates, and an overall exacerbated QT-heart rate adaptation compared with wild-type (WT) mice. A 300-ms increase in the heart rate cycle length induces a 309+/-21% increase in the QT duration of the WT mice versus a 500+/-50% in isk-/- mice (P<0.001). It is concluded that the isk gene product and/or IKs, when present, blunts the QT adaptation to heart rate variations and that steeper QT-RR relationships reflect a greater susceptibility to arrhythmias in patients lacking IKs. |
