SCN5A Variant R190G

Summary of observed carriers, functional annotations, and structural context for SCN5A R190G. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT3 penetrance

8%

11/147 effective observations

Estimated BrS1 penetrance

1%

0/147 effective observations

Total carriers

137

0 BrS1 · 11 LQT3 · 126 unaffected

R190G is present in 124 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 (%)
-6.77 0.997 -0.1 0.912 4 6

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
15176425 2004 12 10 0 0
16754261 2006 1 1 0 0
22402334 2012 1 1 0 0
Literature, cohort, and gnomAD – 137 126 11 0 –
Variant features alone – 15 15 0 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)
22402334 2012
15176425 2004
16754261 2006

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 R190G.
Neighbour residue Distance (Å) Observed variants
192 8
197 14
194 10
188 9
196 13
190 0 R190G, R190L, R190Q, R190W,
179 14 R179X, R179Q,
189 7
198 13
176 15
193 12 W193R, W193X, W193R,
185 9 A185V, A185T
199 15 S199T,
186 5
195 10
182 13 C182R, C182Y,
184 10 H184R,
191 6
187 5 T187S, T187S, T187I,
180 14 G180V,
183 11