rs1244688796

Variant names:

• chr21-34449584-C-T
• rs1244688796
• NM_000219.6:c.51G>A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PP5_Moderate

The NM_000219.6(KCNE1):​c.51G>A​(p.Trp17*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 13)
  • Exomes 𝑓: 0.0000011 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: KCNE1 NM_000219.6 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:2 O:1
• Conservation: PhyloP100: 0.475

Genes affected

KCNE1 (HGNC:6240): (potassium voltage-gated channel subfamily E regulatory subunit 1) The product of this gene belongs to the potassium channel KCNE family. Potassium ion channels are essential to many cellular functions and show a high degree of diversity, varying in their electrophysiologic and pharmacologic properties. This gene encodes a transmembrane protein known to associate with the product of the KVLQT1 gene to form the delayed rectifier potassium channel. Mutation in this gene are associated with both Jervell and Lange-Nielsen and Romano-Ward forms of long-QT syndrome. Alternatively spliced transcript variants encoding the same protein have been identified. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 40 pathogenic variants in the truncated region.
• PP5: Variant 21-34449584-C-T is Pathogenic according to our data. Variant chr21-34449584-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 547164.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNE1	NM_000219.6	c.51G>A	p.Trp17*	stop_gained	Exon 4 of 4	ENST00000399286.3	NP_000210.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNE1	ENST00000399286.3	c.51G>A	p.Trp17*	stop_gained	Exon 4 of 4	1	NM_000219.6	ENSP00000382226.2

Frequencies

GnomAD3 genomes Cov.: 13

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251288 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135868

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000110 AC: 1 AN: 913074 Hom.: 0 Cov.: 14 AF XY: 0.00000217 AC XY: 1 AN XY: 461870

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000159

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 13

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

Jervell and Lange-Nielsen syndrome 2 Pathogenic:1

Jun 21, 2018

National Institute on Deafness and Communication Disorders, National Institutes of Health

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Long QT syndrome Pathogenic:1

Oct 28, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. This variant disrupts a region of the KCNE1 protein in which other variant(s) (p.Arg98Trp) have been determined to be pathogenic (PMID: 10973849, 16922724, 17341399, 21070882, 30530868, 32058015). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. ClinVar contains an entry for this variant (Variation ID: 547164). This premature translational stop signal has been observed in individual(s) with nonsyndromic deafness or long QT syndrome (PMID: 19716085, 30461122, 31941373). This variant is present in population databases (no rsID available, gnomAD 0.0009%). This sequence change creates a premature translational stop signal (p.Trp17*) in the KCNE1 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 113 amino acid(s) of the KCNE1 protein. -

Long QT syndrome 5 Other:1

-

Roden Lab, Vanderbilt University Medical Center

Significance: not provided

Review Status: no classification provided

Collection Method: in vitro

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.44
CADD	Pathogenic	35
DANN	Uncertain	0.99
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.24
FATHMM_MKL	Benign	0.66	D
Vest4		0.77
GERP RS		2.6

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1244688796; hg19: chr21-35821882; COSMIC: COSV105905212;