KCNQ1 Variant A150T

Summary of observed carriers, functional annotations, and structural context for KCNQ1 A150T. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT1 penetrance

72%

7/11 effective observations

Total carriers

1

1 LQT1 · 0 unaffected

Functional studies

1

Publications with functional data

A150T has not been reported in gnomAD. This residue resides in a Hotspot region for LQT1.

Variant features alone are equivalent to phenotyping 6 individuals with LQT1 and 4 unaffected individuals.

In silico predictors

Variant-level computational predictors.
PROVEAN PolyPhen-2 BLAST-PSSM REVEL Penetrance Density LQT1 (%)
-0.35 0.004 0 0.594 81

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
31899541 2020 1 None 1 None
Literature, cohort, and gnomAD – 1 0 1 –
Variant features alone – 15 4 6 –

Totals may differ from individual publications due to duplicate patients removed during curation.

Functional data

Functional assay results from published electrophysiology studies. HM indicates homomeric channels, HT indicates heteromeric channels.

Homomeric channel data

Published electrophysiology measurements (homomeric).
PubMed ID Year Study Type Assay Temperature Cell Type Result

Heteromeric channel data

Published electrophysiology measurements (heteromeric).
PubMed ID Year Study Type Assay Temperature Cell Type Result

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 A150T.
Neighbour residue Distance (Å) Observed variants
150 0 A150T,
149 4
151 4
152 6
153 6 T153M,
148 8
146 8 E146K, E146G, E146Q,
154 8
147 8 Q147R,
143 9 S143F, S143P, S143Y,
155 9
142 10
145 11
156 11
144 12 T144A
139 12
157 13 F157C,
140 13 S140G, S140R, S140R, S140R,
217 13
141 14 V141M,
159 15 M159del,
158 15