21-34449460-G-C

Variant names:

• chr21-34449460-G-C
• rs754731040
• NM_000219.6:c.175C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM1 BP4_Moderate

The NM_000219.6(KCNE1):​c.175C>G​(p.Leu59Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain_significance (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L59M) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 17)
• Consequence: KCNE1 NM_000219.6 missense
• Clinical Significance: - - O:1
• Conservation: PhyloP100: 1.79
• Publications: 0 publications found

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]

KCNE1 Gene-Disease associations (from GenCC):

• long QT syndrome 5

  Inheritance: AD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: ClinGen, G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• Jervell and Lange-Nielsen syndrome 2

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia
• Jervell and Lange-Nielsen syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• atrial fibrillation

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 16 uncertain in NM_000219.6
• BP4: Computational evidence support a benign effect (MetaRNN=0.12141049).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNE1	NM_000219.6	c.175C>G	p.Leu59Val	missense_variant	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.175C>G	p.Leu59Val	missense_variant	Exon 4 of 4	1	NM_000219.6	ENSP00000382226.2

Frequencies

GnomAD3 genomes Cov.: 17

GnomAD4 exome Cov.: 19

GnomAD4 genome Cov.: 17

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

ClinVar

Significance: -

Submissions summary: Other:1

Revision: -

Submissions by phenotype

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
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.016	T
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	19
DANN	Uncertain	0.98
DEOGEN2	Benign	0.42	T;T;T;T;T;T;T;T
Eigen	Benign	-0.19
Eigen_PC	Benign	-0.017
FATHMM_MKL	Benign	0.74	D
LIST_S2	Benign	0.75	.;.;T;.;.;.;.;.
M_CAP	Benign	0.034	D
MetaRNN	Benign	0.12	T;T;T;T;T;T;T;T
MetaSVM	Uncertain	-0.14	T
MutationAssessor	Uncertain	2.3	M;M;M;M;M;M;M;M
PhyloP100		1.8
PrimateAI	Benign	0.42	T
PROVEAN	Benign	0.060	N;.;.;N;N;N;N;N
REVEL	Uncertain	0.34
Sift	Benign	0.38	T;.;.;T;T;T;T;T
Sift4G	Benign	0.19	T;T;T;T;T;T;T;T
Polyphen		0.027	B;B;B;B;B;B;B;B
Vest4		0.046
MutPred		0.22		Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);
MVP		0.81
MPC		0.11
ClinPred		0.44	T
GERP RS		4.1
Varity_R		0.084
gMVP		0.59
Mutation Taster		=70/30	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs754731040; hg19: chr21-35821758;