11-2745004-G-A

Variant names:

• chr11-2745004-G-A
• rs2237877
• NM_000218.3:c.1515-23840G>A

Variant summary

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

The NM_000218.3(KCNQ1):​c.1515-23840G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.12 in 152,036 control chromosomes in the GnomAD database, including 1,218 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 (1218 hom., cov: 32)
• Consequence: KCNQ1 NM_000218.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.75
• Publications: 2 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=-1.03).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.233 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ1	NM_000218.3	c.1515-23840G>A		intron_variant	Intron 11 of 15	ENST00000155840.12	NP_000209.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNQ1	ENST00000155840.12	c.1515-23840G>A		intron_variant	Intron 11 of 15	1	NM_000218.3	ENSP00000155840.2

Frequencies

GnomAD3 genomes AF: 0.120 AC: 18296 AN: 151918 Hom.: 1217 Cov.: 32

Gnomad AFR AF: 0.0747

Gnomad AMI AF: 0.0672

Gnomad AMR AF: 0.135

Gnomad ASJ AF: 0.165

Gnomad EAS AF: 0.243

Gnomad SAS AF: 0.153

Gnomad FIN AF: 0.0855

Gnomad MID AF: 0.153

Gnomad NFE AF: 0.136

Gnomad OTH AF: 0.138

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

GnomAD4 genome AF: 0.120 AC: 18310 AN: 152036 Hom.: 1218 Cov.: 32 AF XY: 0.118 AC XY: 8766 AN XY: 74296

African (AFR) AF: 0.0748 AC: 3104 AN: 41476

American (AMR) AF: 0.135 AC: 2070 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.165 AC: 570 AN: 3464

East Asian (EAS) AF: 0.244 AC: 1259 AN: 5160

South Asian (SAS) AF: 0.153 AC: 733 AN: 4786

European-Finnish (FIN) AF: 0.0855 AC: 905 AN: 10582

Middle Eastern (MID) AF: 0.144 AC: 42 AN: 292

European-Non Finnish (NFE) AF: 0.136 AC: 9274 AN: 67974

Other (OTH) AF: 0.139 AC: 292 AN: 2108

Alfa AF: 0.133 Hom.: 2033

Bravo AF: 0.120

Asia WGS AF: 0.172 AC: 597 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	0.049
DANN	Benign	0.84
PhyloP100		-1.7
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: rs2237877; hg19: chr11-2766234;