SCN5A Variant A447G
Summary of observed carriers, functional annotations, and structural context for SCN5A A447G. Data combine curated literature, international cohorts, and gnomAD observations.
Estimated LQT3 penetrance
4%
0/30 effective observations
Estimated BrS1 penetrance
7%
1/30 effective observations
Total carriers
20
0 BrS1 · 0 LQT3 · 20 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 (%) |
|---|---|---|---|---|---|
| -2.47 | 0.951 | 0.21 | 0.538 | 24 | 20 |
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 |
|---|---|---|---|---|---|---|---|
| 20129283 | 2010 | 1 | 0 | 0 | 0 | ||
| Literature, cohort, and gnomAD | – | 20 | 20 | 0 | 0 | – | |
| 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.
| PubMed ID | Year | Cell Type | Peak Current (% WT) | V1/2 Activation (mV) | V1/2 Inactivation (mV) | Late/Persistent Current (% WT) |
|---|---|---|---|---|---|---|
| 20129283 | 2010 |
Nearby variants
Neighbouring residues within 15 Ångström provide structural context. Variants listed in the right-most column have been observed clinically or in gnomAD.
| Neighbour residue | Distance (Å) | Observed variants |
|---|---|---|
| 432 | 15 | |
| 433 | 14 | R433S, R433H, R433C, |
| 434 | 14 | |
| 435 | 13 | |
| 436 | 13 | |
| 437 | 12 | A437V, |
| 438 | 11 | M438L, M438T, M438L, |
| 439 | 11 | E439V, E439K, |
| 440 | 10 | |
| 441 | 9 | L441F, |
| 442 | 8 | |
| 443 | 8 | |
| 444 | 7 | E444fsX14, |
| 445 | 5 | H445Q, H445D, H445Q, H445Y, |
| 446 | 4 | E446K, |
| 447 | 0 | c.1338+2T>A, c.1339-24G>A, A447G, A447S, |
| 448 | 4 | |
| 449 | 5 | T449A, Y449C, |
| 450 | 7 | |
| 451 | 8 | |
| 452 | 8 | G452D, |
| 453 | 9 | V453M, |
| 454 | 10 | |
| 455 | 11 | |
| 456 | 11 | V456M, |
| 457 | 12 | |
| 458 | 13 | R458H, R458C, p.R458VfsX12, |
| 459 | 13 | S459G, |
| 460 | 14 | |
| 461 | 14 | L461V, |
| 462 | 15 | E462K, E462A, |