KCNQ1 Variant G628D

Summary of observed carriers, functional annotations, and structural context for KCNQ1 G628D. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT1 penetrance

10%

1/11 effective observations

Total carriers

1

0 LQT1 · 1 unaffected

Functional studies

0

Publications with functional data

G628D is present in 1 alleles 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 (%)
-0.66 0.991 -1 0.562 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 – 1 1 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 G628D.
Neighbour residue Distance (Å) Observed variants
628 0 G628S, G628D,
627 4
629 4 G629S,
626 5 G626S,
630 5 P630S, P630T,
625 7 P625R,
631 7 P631R,
624 8
632 8
623 8
633 8
622 9 G622S,
634 9
621 10 G621S, G621C, G621D,
635 10 G635R, G635R,
620 11
636 11
619 11 L619M,
637 11
618 12
638 12
617 13
639 13
616 13
640 13 Q640L
615 14
641 14 P641L,
614 14 H614del,
642 14
613 15
643 15 G643S,