SCN5A Variant F103I

Summary of observed carriers, functional annotations, and structural context for SCN5A F103I. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT3 penetrance

21%

1/10 effective observations

Estimated BrS1 penetrance

32%

3/10 effective observations

Total carriers

0

0 BrS1 · 0 LQT3 · 0 unaffected

F103I has not been reported in gnomAD. This residue resides in a Hotspot region for Brugada syndrome and a Mild_Hotspot region for LQT3.

Variant features alone are equivalent to phenotyping 3 individuals for Brugada syndrome and 1 individuals for LQT3.

In silico predictors

Variant-level computational predictors.
PROVEAN PolyPhen-2 BLAST-PSSM REVEL Penetrance Density BrS (%) Penetrance Density LQT3 (%)
NA NA NA 0.934 43 25

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 – 0 0 0 0 –
Variant features alone – 15 11 1 3 – –

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 F103I.
Neighbour residue Distance (Å) Observed variants
88 15 S88G,
89 14
90 14 p.Q90WfsX14,
91 13
92 13 c.274-24C>T, T92I,
93 12 F93S,
94 11 I94V, I94S,
95 11 V95I, V95L, V95L,
96 10
97 9
98 8
99 8
100 7
101 5 T101I,
102 4
103 0
104 4 R104G, R104W, R104Q,
105 5
106 7 S106T,
107 8
108 8
109 9 N109K, N109K,
110 10 A110T,
111 11
112 11 Y112C,
113 12 V113I, V113A,
114 13
115 13 S115G
116 14
117 14
118 15