rs28730758

Variant names:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000218.3(KCNQ1):c.1394-14C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0144 in 1,614,106 control chromosomes in the GnomAD database, including 206 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.011 ( 20 hom., cov: 33)

Exomes 𝑓: 0.015 ( 186 hom. )

Consequence

KCNQ1
NM_000218.3 intron

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:15

Conservation

PhyloP100: -0.488

Variant links:

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 links:

KCNQ1OT1 (HGNC:6295): (KCNQ1 opposite strand/antisense transcript 1) Human chromosomal region 11p15.5 contains two clusters of epigenetically-regulated genes that are expressed from only one chromosome in a parent-of-origin manner. Each cluster, or imprinted domain, is regulated by a functionally independent imprinting control region (ICR). The human CDKN1C/KCNQ1OT1 domain is regulated by an ICR located in an intron of KCNQ1, and contains at least eight genes that are expressed exclusively or preferentially from the maternally-inherited allele. The DNA of the ICR is specifically methylated on the maternally-inherited chromosome, and unmethylated on the paternally-inherited chromosome. The ICR contains the promoter of the KCNQ1OT1 gene that is exclusively expressed from the paternal allele. The KCNQ1OT1 transcript is the antisense to the KCNQ1 gene and is a unspliced long non-coding RNA. It interacts with chromatin and regulates transcription of multiple target genes through epigenetic modifications. The transcript is abnormally expressed from both chromosomes in most patients with Beckwith-Wiedemann syndrome, and the transcript also plays an important role in colorectal carcinogenesis. [provided by RefSeq, Apr 2012]

KCNQ1OT1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.8).

BP6

Variant 11-2661947-C-T is Benign according to our data. Variant chr11-2661947-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 42485.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-2661947-C-T is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.0107 (1636/152302) while in subpopulation EAS AF= 0.041 (212/5170). AF 95% confidence interval is 0.0365. There are 20 homozygotes in gnomad4. There are 756 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 20 AD,AR,Digenic gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ1	NM_000218.3 link	c.1394-14C>T		intron_variant	Intron 10 of 15	ENST00000155840.12	NP_000209.2	P51787-1Q96AI9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNQ1	ENST00000155840.12 link	c.1394-14C>T		intron_variant	Intron 10 of 15	1	NM_000218.3	ENSP00000155840.2		P51787-1

Frequencies

GnomAD3 genomes

AF:

0.0108

AC:

1638

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00290

Gnomad AMI

AF:

0.00110

Gnomad AMR

AF:

0.00870

Gnomad ASJ

AF:

0.00433

Gnomad EAS

AF:

0.0413

Gnomad SAS

AF:

0.00538

Gnomad FIN

AF:

0.00198

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0160

Gnomad OTH

AF:

0.0100

GnomAD3 exomes

AF:

0.0109

AC:

2739

AN:

251268

Hom.:

AF XY:

0.0105

AC XY:

1420

AN XY:

135862

show subpopulations

Gnomad AFR exome

AF:

0.00289

Gnomad AMR exome

AF:

0.00535

Gnomad ASJ exome

AF:

0.00209

Gnomad EAS exome

AF:

0.0439

Gnomad SAS exome

AF:

0.00274

Gnomad FIN exome

AF:

0.00324

Gnomad NFE exome

AF:

0.0129

Gnomad OTH exome

AF:

0.00930

GnomAD4 exome

AF:

0.0148

AC:

21658

AN:

1461804

Hom.:

186

Cov.:

AF XY:

0.0144

AC XY:

10493

AN XY:

727198

show subpopulations

Gnomad4 AFR exome

AF:

0.00260

Gnomad4 AMR exome

AF:

0.00537

Gnomad4 ASJ exome

AF:

0.00218

Gnomad4 EAS exome

AF:

0.0377

Gnomad4 SAS exome

AF:

0.00281

Gnomad4 FIN exome

AF:

0.00358

Gnomad4 NFE exome

AF:

0.0166

Gnomad4 OTH exome

AF:

0.0140

GnomAD4 genome

AF:

0.0107

AC:

1636

AN:

152302

Hom.:

Cov.:

AF XY:

0.0102

AC XY:

756

AN XY:

74474

show subpopulations

Gnomad4 AFR

AF:

0.00289

Gnomad4 AMR

AF:

0.00869

Gnomad4 ASJ

AF:

0.00433

Gnomad4 EAS

AF:

0.0410

Gnomad4 SAS

AF:

0.00538

Gnomad4 FIN

AF:

0.00198

Gnomad4 NFE

AF:

0.0160

Gnomad4 OTH

AF:

0.00992

Alfa

AF:

0.0119

Hom.:

Bravo

AF:

0.0104

Asia WGS

AF:

0.0260

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:15

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:6

Aug 12, 2019

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: KCNQ1 c.1394-14C>T alters a non-conserved nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. 5/5 computational tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.011 in 251268 control chromosomes, predominantly at a frequency of 0.044 within the East Asian subpopulation in the gnomAD database, including 21 homozygotes. The observed variant frequency within East Asian control individuals in the gnomAD database is approximately 440-folds over the estimated maximal expected allele frequency for a pathogenic variant in KCNQ1 causing Arrhythmia phenotype (0.0001), strongly suggesting that the variant is a benign polymorphism found primarily in populations of East Asian origin. Two ClinVar submissions (evaluation after 2014) cite the variant once as benign and once as likely benign. Based on the evidence outlined above, the variant was classified as benign. -

Apr 30, 2012

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

1394-14C>T in Intron 10 of KCNQ1: This variant is not expected to have clinical significance because it has been identified in 1.5% (106/7020) of European Ameri can chromosomes from a broad population by the NHLBI Exome Sequencing Project (h ttp://evs.gs.washington.edu/EVS; dbSNP rs28730758). -

Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Clinical Genetics, Academic Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided

Benign:2

Mar 03, 2015

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 09, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Long QT syndrome 1

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Atrial fibrillation, familial, 3

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Jervell and Lange-Nielsen syndrome 1

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Short QT syndrome type 2

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Congenital long QT syndrome

Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Long QT syndrome

Benign:1

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiac arrhythmia

Benign:1

Mar 19, 2018

Color Diagnostics, LLC DBA Color Health

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.80

CADD

Benign

0.28

DANN

Benign

0.41

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over