Linkage of the long QT syndrome to the short arm of chromosome 11: use of five highly polymorphic markers towards more detailed localization of the mutant gene
✍ Scribed by Katariina Kainulainen; Heikki Swan; Helena Miettinen; Matti Viitasalo; Liisa Rovamo; Lauri Toivonen; Kimmo Kontula
- Publisher
- Springer
- Year
- 1995
- Tongue
- English
- Weight
- 433 KB
- Volume
- 96
- Category
- Article
- ISSN
- 0340-6717
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✦ Synopsis
The long QT syndrome is an autosomally dominantly inherited cardiac disorder characterized by abnormalities of myocardial repolarization, exercise-or stressrelated syncopal attacks and risk of sudden death due to cardiac arrhythmias. Genetic linkage studies have defined three LQT loci on chromosomes 11p15.5, 3q21-24 and 7p35-36. We performed linkage analyses in three Finnish LQT families using five amplifiable markers assigned to chromosome l lp15. By multipoint linkage analyses we obtained a maximal lod score of 5.503, suggesting that the LQT1 locus maps between DllS922 and DI1S1338 on chromosome 11. Our data provide a step towards closer definition of the exact borderlines of the LQT1 locus in chromosome 11 and demonstrate markers with high utility in identification of gene carriers in the affected families.
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