rs2299620

Variant names:

• chr11-2837065-C-T
• rs2299620
• NM_000218.3:c.1795-10702C>T

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000218.3(KCNQ1):​c.1795-10702C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.115 in 152,158 control chromosomes in the GnomAD database, including 1,810 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.12 (1810 hom., cov: 33)
• Consequence: KCNQ1 NM_000218.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0380
• Publications: 24 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: PanelApp Australia, Labcorp Genetics (formerly Invitae), G2P
• 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: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.358 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ1	NM_000218.3	c.1795-10702C>T		intron_variant	Intron 15 of 15	ENST00000155840.12	NP_000209.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNQ1	ENST00000155840.12	c.1795-10702C>T		intron_variant	Intron 15 of 15	1	NM_000218.3	ENSP00000155840.2

Frequencies

GnomAD3 genomes AF: 0.115 AC: 17516 AN: 152040 Hom.: 1800 Cov.: 33

Gnomad AFR AF: 0.201

Gnomad AMI AF: 0.00877

Gnomad AMR AF: 0.223

Gnomad ASJ AF: 0.0424

Gnomad EAS AF: 0.371

Gnomad SAS AF: 0.0257

Gnomad FIN AF: 0.0899

Gnomad MID AF: 0.0823

Gnomad NFE AF: 0.0358

Gnomad OTH AF: 0.0976

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.115 AC: 17559 AN: 152158 Hom.: 1810 Cov.: 33 AF XY: 0.119 AC XY: 8872 AN XY: 74406

African (AFR) AF: 0.201 AC: 8321 AN: 41498

American (AMR) AF: 0.223 AC: 3416 AN: 15306

Ashkenazi Jewish (ASJ) AF: 0.0424 AC: 147 AN: 3468

East Asian (EAS) AF: 0.372 AC: 1913 AN: 5148

South Asian (SAS) AF: 0.0255 AC: 123 AN: 4822

European-Finnish (FIN) AF: 0.0899 AC: 954 AN: 10608

Middle Eastern (MID) AF: 0.0850 AC: 25 AN: 294

European-Non Finnish (NFE) AF: 0.0358 AC: 2431 AN: 67990

Other (OTH) AF: 0.105 AC: 221 AN: 2112

Alfa AF: 0.0513 Hom.: 193

Bravo AF: 0.132

Asia WGS AF: 0.225 AC: 781 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	2.6
DANN	Benign	0.78
PhyloP100		0.038
Mutation Taster		=100/0	polymorphism (auto)

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: rs2299620; hg19: chr11-2858295;