KCNQ1 Variant S571P Detail

We estimate the penetrance of LQTS for KCNQ1 S571P is 47%. This variant was found in a total of 1 carriers in 0 papers or gnomAD, 0 had LQTS. S571P is present in 1 alleles in gnomAD. S571P has not been functionally characterized. This residue is located in a Hotspot region for LQT1. In silico predictions, functional data (if available), and location in structure are equivalent to observing 5 individuals with LQT1 and 5 unaffected individuals. These data combined with observations of carriers lead us to estimate the LQTS penetrance for KCNQ1 S571P around 47% (5/11).

In Silico Data

PROVEAN PolyPhen-2 BLAST-PSSM REVEL Penetrance Density (%)
-2.17 0.099 5 0.748 58
PROVEAN scores less than -2 are considered deleterious. REVEL scores higher than 0.5 or 0.75 are considered likely pathogenic (higher sensitivity with the former cutoff, higher specificity with the latter cutoff). A PolyPhen-2 score of 0.85 or greater is considered likely pathogenic. BLAST-PSSM reflects the evolutionary conservation of residue substitutions, more negative numbers indicate fewer observations of the specific substitution than is expected. Penetrance density is our previously published method to calculate the average LQTS probability density in a shell of residues surrounding a residue of interest (Kroncke et al. 2019).

Reported Carrier Data

PubMed ID Year Carriers Unaffected LQT1 Other Disease
Summary totals might not agree with the literature table because of duplicate patients, which were excluded from the total counts. We do not distinguish here between multiple missense codons. Missense variants are combined across degenerate codon substitutions since codon-level data were not consistently available for curation.

S571P has 31 previously observed neighbors within 15 angstroms

A residue within a folded protein on average has nearest neighbors that fall roughly into two shells: a "nearest" neighbor around 5-6 angstroms and a second shell around 11 angstroms. NOTE: some residues appear multiple times at different distances. This results from the fact that the functional KV7.1 channel is a homotetramer and occasionally the same residue from multiple subunits is present within the 15A window. All variants shown in the rightmost column have been observed in at least one individual in the literature or gnomAD.

Neighbor Distance (Angstroms) Variants Observed in Individuals
571 0 S571L, S571P,
570 4 P570L,
572 4
569 5 K569E,
573 5 F573L, F573L, F573L,
568 7 G568R, G568R, G568E,
574 7 I574V,
567 8 I567T, I567S,
575 8
566 8 S566F, S566Y, S566P,
576 8 V576I,
565 9
577 9
564 10 D564H, D564N,
578 10 E578K, E578V,
563 11
579 11
562 11 R562M, R562S, R562S,
580 11 S580G, S580N,
561 12
581 12
560 13
582 13
559 13 L559P,
583 13 R583H, R583C, R583G,
558 14
584 14 G584S,
557 14 K557E,
585 14 S585N,
556 15
586 15 N586D,