SCN5A Variant T1268S

Summary of observed carriers, functional annotations, and structural context for SCN5A T1268S. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT3 penetrance

7%

0/11 effective observations

Estimated BrS1 penetrance

9%

0/11 effective observations

Total carriers

1

0 BrS1 · 0 LQT3 · 1 unaffected

T1268S is present in 1 alleles in gnomAD. This residue resides in a Non_Hotspot region for Brugada syndrome and a Non_Hotspot region for LQT3.

Variant features alone are equivalent to phenotyping 0 individuals for Brugada syndrome and 0 individuals for LQT3.

In silico predictors

Variant-level computational predictors.
PROVEAN PolyPhen-2 BLAST-PSSM REVEL Penetrance Density BrS (%) Penetrance Density LQT3 (%)
-3.9 0.988 0.09 0.876 5 8

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

Observed carriers by publication or cohort.
Source Year Carriers Unaffected LQT3 BrS1 Other Other Disease
Literature, cohort, and gnomAD – 1 1 0 0 –
Variant features alone – 15 15 0 0 – –

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.

Previously observed variants near T1268S.
Neighbour residue Distance (Å) Observed variants
1264 8 K1264N, K1264R, K1264N,
1267 6
1312 14
1270 7 A1270S,
1262 9 G1262S,
1271 11 W1271C, W1271C,
1257 13
1268 0 T1268S, T1268N, T1268S,
1265 6
1275 13 D1275N,
1274 12
1258 12
1254 14
1269 5 N1269S,
1276 11
1272 8
1266 7
1260 14 A1260D,
1261 10
1263 8
1277 13
1273 8 W1273C, W1273C, c.3816delG,