KCNH2 Variant L385Q

Summary of observed carriers, functional annotations, and structural context for KCNH2 L385Q. Data combine curated literature, international cohorts, and gnomAD observations.

Estimated LQT2 penetrance

10%

0/10 effective observations

Total carriers

0

0 LQT2 · 0 unaffected

Functional studies

0

Publications with functional data

L385Q has not been reported in gnomAD. This residue resides in a Mild_Hotspot region for LQT2.

We have tested the trafficking efficiency of this variant: 83% of WT with a standard error of 13%. 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 0 individuals with LQT2 and 10 unaffected individuals.

In silico predictors

Variant-level computational predictors.
PROVEAN PolyPhen-2 BLAST-PSSM REVEL Penetrance Density LQT2 (%)
-5.71 0.999 -2 0.98 29

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 – 0 0 0 –
Variant features alone – 10 10 0 –

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 L385Q.
Neighbour residue Distance (Å) Observed variants
385 0
384 4
386 4 P386X,
383 5
387 5
382 7 A382T,
388 7
381 8
389 8
380 8 L380X,
390 8
379 9 S379Y,
391 9 Q391X,
378 10
392 10
377 11
393 11 P393L,
376 11 Q376R, Q376sp,
394 11 R394C, R394H
375 12
395 12
374 13
396 13
373 13
397 13 R397H, R397X,
372 14
398 14 W398L, W398X,
371 14
399 14
370 15
400 15 I400N,