NM_000218.3:c.1637C>T

Variant names:

• chr11-2776006-C-T
• rs199473480
• NM_000218.3:c.1637C>T

Variant summary

Our verdict is Pathogenic. The variant received 21 ACMG points: 21P and 0B. PS3 PM1 PM2 PP2 PP3_Strong PP5_Very_Strong

The NM_000218.3(KCNQ1):​c.1637C>T​(p.Ser546Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000352 in 1,421,670 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 13/23 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). ClinVar reports functional evidence for this variant: "SCV000074021: Experimental studies have shown that this missense change affects KCNQ1 function (PMID:19808498, 25037568).; SCV000234512: Functional studies suggest that p.(S546L) results in reduced IKs currents in heterologous cells (Yang et al., 2009);; SCV000737393: Furthermore, the p.S546L variant disrupts KCNQ1 function in in vitro electrophysiological assays (Yang T et al. Circ Arrhythm Electrophysiol 2009 Aug; 2(4):417-26; Dvir M, J. Cell. Sci. 2014 Sep; 127(Pt 18):3943-55).; SCV005400401: "In vitro functional analysis demonstrated that this variant results in a loss of potassium channel function (PMID:19808498);"; SCV001357884: Experimental studies have shown that this variant may impair the channel function and disrupt interaction with the KCNE1 protein (PMID:19808498, 25037568).". Synonymous variant affecting the same amino acid position (i.e. S546S) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: KCNQ1 NM_000218.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:8 O:1
• Conservation: PhyloP100: 5.66
• Publications: 14 publications found

Genes affected

KCNQ1 (HGNC:6294): (potassium voltage-gated channel subfamily Q member 1) This gene encodes a voltage-gated potassium channel required for repolarization phase of the cardiac action potential. This protein can form heteromultimers with two other potassium channel proteins, KCNE1 and KCNE3. Mutations in this gene are associated with hereditary long QT syndrome 1 (also known as Romano-Ward syndrome), Jervell and Lange-Nielsen syndrome, and familial atrial fibrillation. This gene exhibits tissue-specific imprinting, with preferential expression from the maternal allele in some tissues, and biallelic expression in others. This gene is located in a region of chromosome 11 amongst other imprinted genes that are associated with Beckwith-Wiedemann syndrome (BWS), and itself has been shown to be disrupted by chromosomal rearrangements in patients with BWS. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Aug 2011]

KCNQ1 Gene-Disease associations (from GenCC):

• long QT syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• long QT syndrome 1

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

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Jervell and Lange-Nielsen syndrome 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• atrial fibrillation, familial, 3

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• short QT syndrome

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: ClinGen, Orphanet
• short QT syndrome type 2

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• familial atrial fibrillation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Jervell and Lange-Nielsen syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• hypertrophic cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Pathogenic. The variant received 21 ACMG points.

• PS3: PS3 evidence extracted from ClinVar submissions: SCV000074021: Experimental studies have shown that this missense change affects KCNQ1 function (PMID: 19808498, 25037568).; SCV000234512: Functional studies suggest that p.(S546L) results in reduced IKs currents in heterologous cells (Yang et al., 2009);; SCV000737393: Furthermore, the p.S546L variant disrupts KCNQ1 function in in vitro electrophysiological assays (Yang T et al. Circ Arrhythm Electrophysiol 2009 Aug; 2(4):417-26; Dvir M, J. Cell. Sci. 2014 Sep; 127(Pt 18):3943-55).; SCV005400401: "In vitro functional analysis demonstrated that this variant results in a loss of potassium channel function (PMID: 19808498);"; SCV001357884: Experimental studies have shown that this variant may impair the channel function and disrupt interaction with the KCNE1 protein (PMID: 19808498, 25037568).
• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 12 uncertain in NM_000218.3
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 212 curated pathogenic missense variants (we use a threshold of 10). The gene has 12 curated benign missense variants. Gene score misZ: 1.8321 (below the threshold of 3.09). Trascript score misZ: 0.90233 (below the threshold of 3.09). GenCC associations: The gene is linked to short QT syndrome, Jervell and Lange-Nielsen syndrome 1, long QT syndrome 1, familial atrial fibrillation, short QT syndrome type 2, long QT syndrome, atrial fibrillation, familial, 3, Jervell and Lange-Nielsen syndrome, hypertrophic cardiomyopathy.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.986
• PP5: Variant 11-2776006-C-T is Pathogenic according to our data. Variant chr11-2776006-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 53000.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000218.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNQ1	NM_000218.3	MANE Select	c.1637C>T	p.Ser546Leu	missense	Exon 13 of 16	NP_000209.2
	KCNQ1	NM_001406836.1		c.1541C>T	p.Ser514Leu	missense	Exon 12 of 15	NP_001393765.1
	KCNQ1	NM_001406837.1		c.1367C>T	p.Ser456Leu	missense	Exon 14 of 17	NP_001393766.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNQ1	ENST00000155840.12	TSL:1 MANE Select	c.1637C>T	p.Ser546Leu	missense	Exon 13 of 16	ENSP00000155840.2	P51787-1
	KCNQ1	ENST00000335475.6	TSL:1	c.1256C>T	p.Ser419Leu	missense	Exon 13 of 16	ENSP00000334497.5	P51787-2
	KCNQ1	ENST00000910997.1		c.1634C>T	p.Ser545Leu	missense	Exon 13 of 16	ENSP00000581056.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000352 AC: 5 AN: 1421670 Hom.: 0 Cov.: 32 AF XY: 0.00000285 AC XY: 2 AN XY: 702954

African (AFR) AF: 0.00 AC: 0 AN: 32970

American (AMR) AF: 0.00 AC: 0 AN: 37682

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25334

East Asian (EAS) AF: 0.00 AC: 0 AN: 38036

South Asian (SAS) AF: 0.00 AC: 0 AN: 80636

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50150

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5708

European-Non Finnish (NFE) AF: 0.00000458 AC: 5 AN: 1092048

Other (OTH) AF: 0.00 AC: 0 AN: 59106

GnomAD4 genome Cov.: 33

Alfa AF: 0.00574 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	not provided (3)
2	-	-	Long QT syndrome 1 (2)
1	-	-	Cardiac arrhythmia (1)
1	-	-	Cardiovascular phenotype (1)
1	-	-	Long QT syndrome (1)
-	-	-	Congenital long QT syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
CardioboostArm	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.51
CADD	Pathogenic	32
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.99	D
Eigen	Pathogenic	0.71
Eigen_PC	Uncertain	0.62
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.95	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	0.98	D
MutationAssessor	Pathogenic	3.0	M
PhyloP100		5.7
PrimateAI	Uncertain	0.79	T
PROVEAN	Pathogenic	-5.0	D
REVEL	Pathogenic	0.94
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0010	D
Polyphen		0.99	D
Vest4		0.95
MutPred		0.90		Gain of helix (P = 0.0696)
MVP		0.98
MPC		1.1
ClinPred		1.0	D
GERP RS		3.8
Varity_R		0.82
gMVP		0.98
Mutation Taster		=0/100	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs199473480; hg19: chr11-2797236; COSMIC: COSV105028479; COSMIC: COSV105028479;