SCN5A Variant W156X
Summary of observed carriers, functional annotations, and structural context for SCN5A W156X. Data combine curated literature, international cohorts, and gnomAD observations.
Estimated LQT3 penetrance
2%
0/13 effective observations
Estimated BrS1 penetrance
30%
3/13 effective observations
Total carriers
3
2 BrS1 · 0 LQT3 · 1 unaffected
Variant features alone are equivalent to phenotyping 1 individuals for Brugada syndrome and 0 individuals for LQT3.
In silico predictors
| PROVEAN | PolyPhen-2 | BLAST-PSSM | REVEL | Penetrance Density BrS (%) | Penetrance Density LQT3 (%) |
|---|---|---|---|---|---|
| NA | NA | NA | None | 6 | 0 |
PROVEAN scores below -2 suggest deleterious impact. REVEL scores above 0.5–0.75 are often interpreted as likely pathogenic. PolyPhen-2 scores above 0.85 are typically pathogenic. Penetrance density summarises neighbouring residue risk (Kroncke et al. 2019).
Reported carrier data
| Source | Year | Carriers | Unaffected | LQT3 | BrS1 | Other | Other Disease |
|---|---|---|---|---|---|---|---|
| 27784737 | 2016 | 1 | 0 | 1 | 0 | ||
| 12574143 | 2003 | 2 | 0 | 0 | 1 | DCM, conduction | |
| 19251209 | 2009 | 1 | 0 | 1 | 0 | ||
| 16764707 | 2006 | 1 | 0 | 1 | 0 | ||
| 21273195 | 2011 | 1 | 0 | 1 | 0 | ||
| 22885917 | 2012 | 2 | 0 | 2 | 0 | ||
| 20129283 | 2010 | 1 | 0 | 1 | 0 | ||
| 30059973 | 2018 | 1 | 1 | 0 | 0 | ||
| Literature, cohort, and gnomAD | – | 3 | 1 | 0 | 2 | – | |
| Variant features alone | – | 15 | 14 | 0 | 1 | – | – |
Totals may differ from individual publications due to duplicate patients removed during curation.
Functional data
Peak and late/persistent current values are relative to wild-type (100% indicates no change). V1/2 activation and inactivation denote the membrane potentials (mV) at which half-maximal current is achieved.