KCNQ1 Variant A28T

Summary of observed carriers, functional annotations, and structural context for KCNQ1 A28T. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT1 penetrance

13%

1/10 effective observations

Total carriers

0

0 LQT1 · 0 unaffected

Functional studies

0

Publications with functional data

A28T has not been reported in gnomAD. This residue resides in a Non_Hotspot region for LQT1.

Variant features alone are equivalent to phenotyping 1 individuals with LQT1 and 9 unaffected individuals.

In silico predictors

Variant-level computational predictors.
PROVEAN PolyPhen-2 BLAST-PSSM REVEL Penetrance Density LQT1 (%)
0.09 0.008 0 0.294 4

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 LQT1 Other Disease
Literature, cohort, and gnomAD – 0 0 0 –
Variant features alone – 15 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.

Previously observed variants near A28T.
Neighbour residue Distance (Å) Observed variants
28 0
27 4
29 4
26 5
30 5
25 7
31 7
24 8
32 8
23 8
33 8
22 9 G22R,
34 9
21 10 P21S
35 10
20 11
36 11
19 11
37 11
18 12
38 12
17 13
39 13
16 13
40 13
15 14
41 14
14 14 R14C,
42 14
13 15
43 15