KCNH2 Variant V112M

Summary of observed carriers, functional annotations, and structural context for KCNH2 V112M. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT2 penetrance

13%

90% CI: 1.4% – 31.5%

1/11 effective observations

Total carriers

1

0 LQT2 · 1 unaffected

Functional studies

0

Publications with functional data

V112M is present in 1 alleles in gnomAD. This residue resides in a Mild_Hotspot region for LQT2.

We have tested the trafficking efficiency of this variant: 70% of WT with a standard error of 8%. 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 (%)
-2.128 0.978 0 0.802 34

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 – 1 1 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 V112M.
Neighbour residue Distance (Å) Observed variants
112 0 V112M,
111 4 D111V,
113 5 V113Del,
127 6
91 6
110 6 V110A,
114 6 P114S,
92 6 R92C, R92L,
90 7 E90K,
126 7
85 7 A85P, A85V,
125 7
93 7 K93X, K93R,
86 8 L86R,
82 8 I82Del, I82dup, I82Ins, I82T,
94 8 V94L, V94L, V94A,
128 8 N128S,
89 9 A89G, A89V,
129 9 F129C,
109 10 L109X, L109Q, L109P,
64 10 C64R, C64Y,
30 10 I30Del, I30T,
115 10 V115M,
83 10 A83P, A83fsX,
88 10
81 11 Q81E, Q81X, Q81P, Q81H, Q81H,
32 11 A32T,
31 11 I31S,
84 11
65 12 T65P,
124 12 M124T, M124R,
29 12 F29L, F29V, F29S, F29L, F29L,
87 12 L87P,
122 12
108 12 C108Y,
116 13 K116Q,
96 13 I96V, I96T,
95 13 E95K, E95G,
79 13 A79T, A79S, A79Del, A79fsX,
80 13 A80P,
39 13 C39R, C39X,
66 13 C66R, C66G, C66Y,
22 13 F22Y, F22S,
130 13 E130K,
28 13 K28E,
78 13 A78T, A78P,
123 14
34 14 A34T,
98 14
18 14 I18M,
33 14 N33T
27 14 R27X, R27P,
41 14 V41A,
48 15
63 15 P63H,