SCN5A Variant S115G

Summary of observed carriers, functional annotations, and structural context for SCN5A S115G. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT3 penetrance

62%

3/11 effective observations

Estimated BrS1 penetrance

7%

0/11 effective observations

Total carriers

1

0 BrS1 · 1 LQT3 · 0 unaffected

S115G has not been reported in gnomAD. This residue resides in a Non_Hotspot region for Brugada syndrome and a Hotspot region for LQT3.

Variant features alone are equivalent to phenotyping 0 individuals for Brugada syndrome and 2 individuals for LQT3.

In silico predictors

Variant-level computational predictors.
PROVEAN PolyPhen-2 BLAST-PSSM REVEL Penetrance Density BrS (%) Penetrance Density LQT3 (%)
-3.53 0.688 0.99 0.833 4 73

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
19716085 2009 1 1 0 0
Literature, cohort, and gnomAD – 1 0 1 0 –
Variant features alone – 15 13 2 0 – –

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.

Published electrophysiology measurements.
PubMed ID Year Cell Type Peak Current (% WT) V1/2 Activation (mV) V1/2 Inactivation (mV) Late/Persistent Current (% WT)
19716085 2009

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 S115G.
Neighbour residue Distance (Å) Observed variants
126 14 K126E,
113 7 V113I, V113A,
178 10 A178G,
117 5
119 9 P119L, P119S,
179 11 R179Q, R179X,
177 10 L177P,
123 13 A123V, A123G,
121 6 R121W, R121Q,
124 12 A124D,
118 5
125 12 V125L,
181 10
176 13
174 15 V174I,
115 0 S115G,
182 13 C182Y, C182R
112 7 Y112C,
114 5
184 11 H184R,
116 4
180 9 G180V,
120 10
183 12
122 8