KCNH2 Variant E357G

Summary of observed carriers, functional annotations, and structural context for KCNH2 E357G. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT2 penetrance

10%

1/10 effective observations

Total carriers

0

0 LQT2 · 0 unaffected

Functional studies

0

Publications with functional data

E357G has not been reported in gnomAD. This residue resides in a Non_Hotspot region for LQT2.

We have tested the trafficking efficiency of this variant: 62% of WT with a standard error of 9%. In our analysis we used SE < 20% as 'high quality'. Approximately below 50% of WT is considered PS3 moderate and below 30% is PS3 strong.

Variant features alone are equivalent to phenotyping 1 individuals with LQT2 and 9 unaffected individuals.

In silico predictors

Variant-level computational predictors.
PROVEAN PolyPhen-2 BLAST-PSSM REVEL Penetrance Density LQT2 (%)
-3.678 0.76 -2 0.754 1

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. BLAST-PSSM reflects evolutionary conservation; more negative values indicate rarer substitutions. Penetrance density summarises neighbouring residue risk (Kroncke et al. 2019).

Reported carrier data

Observed carriers by publication or cohort.
Source Year Carriers Unaffected LQT2 Other Disease
Literature, cohort, and gnomAD – 0 0 0 –
Variant features alone – 10 9 1 –

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. Note that some residues appear multiple times at different distances since the functional KV11.1 channel (protein product of KCNH2/hERG) is a homotetramer and occasionally the same residue from multiple subunits is present within the 15Å window.

Previously observed variants near E357G.
Neighbour residue Distance (Å) Observed variants
357 0 E357D, E357D,
356 4 R356C, R356H,
358 4
355 5 D355G,
359 5 I359V,
354 7
360 7
353 8 T353S, T353S,
361 8
352 8
362 8
351 9 S351L,
363 9 I363X,
350 10
364 10 K364X,
349 11
365 11 E365G,
348 11
366 11 R366X, R366Q,
347 12 P347S,
367 12 T367S, T367S,
346 13 D346N, D346Y, D346E, D346E,
368 13 H368Y,
345 13 G345S,
369 13 N369K, N369K
344 14
370 14
343 14 L343fsX,
371 14
342 15 D342A, D342V, D342X,
372 15