SCN5A Variant c.998+5G>A
Summary of observed carriers, functional annotations, and structural context for SCN5A c.998+5G>A. Data combine curated literature, international cohorts, and gnomAD observations.
Estimated LQT3 penetrance
41%
2/11 effective observations
Estimated BrS1 penetrance
31%
3/11 effective observations
Total carriers
1
0 BrS1 · 1 LQT3 · 0 unaffected
Variant features alone are equivalent to phenotyping 3 individuals for Brugada syndrome and 1 individuals for LQT3.
In silico predictors
PROVEAN | PolyPhen-2 | BLAST-PSSM | REVEL | Penetrance Density BrS (%) | Penetrance Density LQT3 (%) |
---|---|---|---|---|---|
NA | NA | NA | None | 48 | 37 |
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 |
---|---|---|---|---|---|---|---|
23631430 | 2013 | 1 | 1 | 0 | 0 | ||
Literature, cohort, and gnomAD | – | 1 | 0 | 1 | 0 | – | |
Variant features alone | – | 15 | 11 | 1 | 3 | – | – |
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) |
---|---|---|---|---|---|---|
23631430 | 2013 |
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 |
---|---|---|
328 | 8 | |
333 | 0 | c.998+5G>A, c.998+1G>A, |
1702 | 12 | |
326 | 6 | |
276 | 14 | L276P, L276Q, |
387 | 10 | |
279 | 14 | |
385 | 9 | A385T, |
338 | 15 | |
1687 | 13 | |
330 | 8 | S330F, |
278 | 11 | H278D, H278R, |
388 | 13 | I388S, |
1698 | 13 | A1698T, |
334 | 3 | c.999-424_1338+81del, |
332 | 3 | A332T, |
327 | 6 | |
339 | 13 | |
1695 | 13 | Q1695X, |
384 | 8 | S384T, |
1688 | 13 | |
1684 | 13 | W1684R, W1684R, |
329 | 7 | |
1692 | 9 | |
386 | 8 | G386R, G386R, G386E, |
1693 | 11 | |
378 | 13 | |
1699 | 10 | |
331 | 6 | |
379 | 11 | |
1703 | 14 | |
341 | 11 | C341Y, |
335 | 7 | C335S, C335S, C335R, |
325 | 9 | L325R, |
1690 | 8 | D1690N, c.5068_5070delGA, |
324 | 10 | |
389 | 13 | Y389H, Y389X, |
390 | 15 | |
275 | 14 | N275K, N275K |
383 | 5 | |
280 | 11 | C280Y, |
323 | 13 | |
382 | 8 | |
337 | 14 | |
1696 | 13 | |
1689 | 8 | D1689N, |
342 | 15 | |
336 | 10 | P336L, |
381 | 11 | c.1141-3C>A, c.1140+1G>A, |
1691 | 5 | |
380 | 11 |