Spectrum of Mutations in Long-QT Syndrome Genes
Key result
Targeted genetic screening identifies LQTS mutations in ~68% of patients, predominantly in KVLQT1 and HERG.
- n=262
Why the study?
Long-QT Syndrome is caused by mutations in five known genes, but the full spectrum and frequency of these mutations in affected individuals required further characterization.
What is the spectrum and frequency of mutations in the 5 defined genes among individuals with Long-QT Syndrome?
Population
262 unrelated individuals with Long-QT Syndrome
Comparison
Mutational screening of five LQTS genes (KVLQT1, HERG, SCN5A, KCNE1, KCNE2)
Design
Cross-sectional mutational analysis study
Authors
Discussion
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Member takes
Implication
Supports prioritizing KVLQT1/HERG in LQTS panels; leaves open broader spectrum and clinical utility in diverse cohorts.
Study Design
Type
Cross-Sectional (n=262)
Structured PICO
What is the spectrum and frequency of mutations in the 5 defined genes among individuals with Long-QT Syndrome?
P
Population
262 unrelated individuals with Long-QT Syndrome screened for mutations in 5 defined genes.
E
Exposure
Mutational analyses screening for mutations in 5 defined genes (KVLQT1, HERG, SCN5A, KCNE1, and KCNE2)
O
Outcome
Identification and characterization of mutations in the 5 defined LQTS genessurrogate
KVLQT1 and HERG mutations account for the vast majority (87%) of identified mutations in Long-QT Syndrome, with missense mutations being the most common type.
Cite This Study
Splawski et al. (2000) conducted a cross-sectional in Long-QT Syndrome (LQTS) (n=262). Mutational analysis of 5 defined genes (KVLQT1, HERG, SCN5A, KCNE1, KCNE2) was evaluated on Presence of mutations in 5 defined genes. Mutational analysis of 262 unrelated individuals with Long-QT Syndrome identified mutations in 68% of patients, with KVLQT1 and HERG accounting for 87% of the identified mutations.