KCNQ1 Variant C445G

Summary of observed carriers, functional annotations, and structural context for KCNQ1 C445G. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT1 penetrance

11%

1/10 effective observations

Total carriers

0

0 LQT1 · 0 unaffected

Functional studies

0

Publications with functional data

C445G 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 (%)
-0.76 0.006 -2 0.547 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 C445G.
Neighbour residue Distance (Å) Observed variants
445 0
444 4 T444M, T444K
446 4 D446E, D446E, D446E, D446E, D446N,
443 5
447 5 P447H,
442 7 H442R,
448 7 P448R, P448Q, P448L, P448S,
441 8 P441S,
449 8 E449K,
440 8
450 8 E450K,
439 9
451 9 R451Q, R451W,
438 10
452 10 R452Q, R452W, R452L,
437 11 M437V,
453 11
436 11
454 11
435 12
455 12 H455Y, H455Q, H455Q, H455R,
434 13 G434R, G434R,
456 13 F456L, F456L, F456L,
433 13 P433A,
457 13
432 14 T432I, T432A,
458 14
431 14 V431L, V431L,
459 14 D459N, D459V,
430 15
460 15 G460S, G460D, G460C,