SCN5A Variant V300I
Summary of observed carriers, functional annotations, and structural context for SCN5A V300I. Data combine curated literature, international cohorts, and gnomAD observations.
Estimated LQT3 penetrance
5%
0/12 effective observations
Estimated BrS1 penetrance
27%
3/12 effective observations
Total carriers
2
1 BrS1 · 0 LQT3 · 1 unaffected
Variant features alone are equivalent to phenotyping 2 individuals for Brugada syndrome and 0 individuals for LQT3.
In silico predictors
| PROVEAN | PolyPhen-2 | BLAST-PSSM | REVEL | Penetrance Density BrS (%) | Penetrance Density LQT3 (%) |
|---|---|---|---|---|---|
| -0.18 | 0 | -1.66 | 0.516 | 26 | 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 |
|---|---|---|---|---|---|---|---|
| 20129283 | 2010 | 1 | 0 | 1 | 0 | ||
| Literature, cohort, and gnomAD | – | 2 | 1 | 0 | 1 | – | |
| Variant features alone | – | 15 | 13 | 0 | 2 | – | – |
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 |
|---|---|---|
| 285 | 15 | T285K, |
| 286 | 14 | A286S, A286V, |
| 287 | 14 | |
| 288 | 13 | N288S, |
| 289 | 13 | G289S, |
| 290 | 12 | p.T290_G292del, |
| 291 | 11 | N291S, N291H, p.N291_S293dup, N291K, p.N291TfsX52, N291K, |
| 292 | 11 | G292S, |
| 293 | 10 | |
| 294 | 9 | V294M, |
| 295 | 8 | E295K, |
| 296 | 8 | |
| 297 | 7 | |
| 298 | 5 | G298S, G298D, |
| 299 | 4 | L299F, L299M, L299F, |
| 300 | 0 | V300I, |
| 301 | 4 | |
| 302 | 5 | |
| 303 | 7 | |
| 304 | 8 | |
| 305 | 8 | D305N |
| 306 | 9 | L306F, L306V, |
| 307 | 10 | |
| 308 | 11 | |
| 309 | 11 | S309C, S309N, |
| 310 | 12 | D310N, |
| 311 | 13 | |
| 312 | 13 | E312K, c.934+1G>A, c.934+4C>T, |
| 313 | 14 | |
| 314 | 14 | |
| 315 | 15 | L315P, |