KCNH2 Variant G71W

Summary of observed carriers, functional annotations, and structural context for KCNH2 G71W. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT2 penetrance

46%

6/13 effective observations

Total carriers

3

3 LQT2 · 0 unaffected

Functional studies

0

Publications with functional data

G71W has not been reported in gnomAD. This residue resides in a Hotspot region for LQT2.

We have tested the trafficking efficiency of this variant: 0% of WT with a standard error of 18%. 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 3 individuals with LQT2 and 7 unaffected individuals.

In silico predictors

Variant-level computational predictors.
PROVEAN PolyPhen-2 BLAST-PSSM REVEL Penetrance Density LQT2 (%)
-5.438 1.0 -3 0.857 71

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
Italy Cohort 2020 1 0 1
26496715 2015 1 0 1
29497013 2018 1 0 1
Literature, cohort, and gnomAD – 3 0 3 –
Variant features alone – 10 7 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. 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 G71W.
Neighbour residue Distance (Å) Observed variants
71 0 G71R, G71R, G71W, G71E,
72 3 P72T, P72S, P72Q, P72R,
74 4 T74fsX, T74M,
70 5 H70R, H70Q, H70Q,
73 5 R73G, R73C, R73fsX, R73H,
99 5 Y99N, Y99S,
97 7
69 8 L69Del, L69P,
98 8
75 8 Q75X,
105 9
67 9
96 9 I96V, I96T,
76 10
68 10 F68L, F68V, F68L, F68L,
103 10
79 11 A79T, A79S, A79Del, A79fsX,
106 11 F106L, F106V, F106L, F106L,
66 11 C66R, C66G, C66Y,
78 11 A78T, A78P,
104 11
100 12 R100G, R100Q, R100P,
77 13 R77S,
65 13 T65P,
107 13 L107P,
102 13 D102H, D102V, D102X,
101 13 K101E,
108 13 C108Y
52 14 C52W,
80 14 A80P,
54 14 Y54N, Y54X,
95 14 E95K, E95G,
82 14 I82Del, I82dup, I82Ins, I82T,