NM_000218.3:c.1515-48747C>T

Variant names:

• chr11-2720097-C-T
• rs2283205
• NM_000218.3:c.1515-48747C>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.1515-48747C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.177 in 152,214 control chromosomes in the GnomAD database, including 2,500 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 0.18 (2500 hom., cov: 33)
• Consequence: KCNQ1 NM_000218.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.68
• Publications: 5 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=-0.95).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.203 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ1	NM_000218.3	c.1515-48747C>T		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.1515-48747C>T		intron_variant	Intron 11 of 15	1	NM_000218.3	ENSP00000155840.2

Frequencies

GnomAD3 genomes AF: 0.177 AC: 26868 AN: 152096 Hom.: 2497 Cov.: 33

Gnomad AFR AF: 0.197

Gnomad AMI AF: 0.266

Gnomad AMR AF: 0.129

Gnomad ASJ AF: 0.172

Gnomad EAS AF: 0.213

Gnomad SAS AF: 0.198

Gnomad FIN AF: 0.139

Gnomad MID AF: 0.223

Gnomad NFE AF: 0.175

Gnomad OTH AF: 0.174

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

GnomAD4 genome AF: 0.177 AC: 26882 AN: 152214 Hom.: 2500 Cov.: 33 AF XY: 0.172 AC XY: 12803 AN XY: 74442

African (AFR) AF: 0.197 AC: 8186 AN: 41530

American (AMR) AF: 0.128 AC: 1960 AN: 15298

Ashkenazi Jewish (ASJ) AF: 0.172 AC: 597 AN: 3468

East Asian (EAS) AF: 0.214 AC: 1105 AN: 5168

South Asian (SAS) AF: 0.197 AC: 951 AN: 4826

European-Finnish (FIN) AF: 0.139 AC: 1479 AN: 10604

Middle Eastern (MID) AF: 0.236 AC: 69 AN: 292

European-Non Finnish (NFE) AF: 0.175 AC: 11924 AN: 68002

Other (OTH) AF: 0.174 AC: 368 AN: 2114

Alfa AF: 0.178 Hom.: 6304

Bravo AF: 0.179

Asia WGS AF: 0.173 AC: 606 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
CADD	Benign	0.11
DANN	Benign	0.54
PhyloP100		-2.7
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: rs2283205; hg19: chr11-2741327;