SCN5A Variant K442M
Summary of observed carriers, functional annotations, and structural context for SCN5A K442M. Data combine curated literature, international cohorts, and gnomAD observations.
Estimated LQT3 penetrance
5%
0/10 effective observations
Estimated BrS1 penetrance
22%
2/10 effective observations
Total carriers
0
0 BrS1 · 0 LQT3 · 0 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 (%) |
|---|---|---|---|---|---|
| NA | NA | NA | 0.618 | 27 | 3 |
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 |
|---|---|---|---|---|---|---|---|
| Literature, cohort, and gnomAD | – | 0 | 0 | 0 | 0 | – | |
| Variant features alone | – | 15 | 13 | 0 | 2 | – | – |
Totals may differ from individual publications due to duplicate patients removed during curation.
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 |
|---|---|---|
| 427 | 15 | |
| 428 | 14 | E428K, |
| 429 | 14 | E429K, p.E429del, |
| 430 | 13 | K430E, |
| 431 | 13 | |
| 432 | 12 | |
| 433 | 11 | R433S, R433C, R433H, |
| 434 | 11 | |
| 435 | 10 | |
| 436 | 9 | |
| 437 | 8 | A437V, |
| 438 | 8 | M438L, M438L, M438T, |
| 439 | 7 | E439K, E439V, |
| 440 | 5 | |
| 441 | 4 | L441F, |
| 442 | 0 | |
| 443 | 4 | |
| 444 | 5 | E444fsX14, |
| 445 | 7 | H445D, H445Y, H445Q, H445Q, |
| 446 | 8 | E446K, |
| 447 | 8 | c.1338+2T>A, c.1339-24G>A, A447S, A447G, |
| 448 | 9 | |
| 449 | 10 | T449A, Y449C, |
| 450 | 11 | |
| 451 | 11 | |
| 452 | 12 | G452D, |
| 453 | 13 | V453M, |
| 454 | 13 | |
| 455 | 14 | |
| 456 | 14 | V456M |
| 457 | 15 |