rs2299618

chr11-2593492-G-Achr11-2593492-G-Cchr11-2593492-G-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000218.3(KCNQ1):c.1393+4638G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.21 in 152,148 control chromosomes in the GnomAD database, including 4,640 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 0.21 (4640 hom., cov: 32)
• Consequence: KCNQ1 NM_000218.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.32

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.525 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNQ1	NM_000218.3	c.1393+4638G>A		intron_variant		ENST00000155840.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNQ1	ENST00000155840.12	c.1393+4638G>A		intron_variant		1	NM_000218.3	P1
KCNQ1	ENST00000335475.6	c.1012+4638G>A		intron_variant		1
KCNQ1	ENST00000496887.7	c.1036+4638G>A		intron_variant		5
KCNQ1	ENST00000646564.2	c.853+4638G>A		intron_variant

Frequencies

GnomAD3 genomes AF: 0.210 AC: 31940 AN: 152030 Hom.: 4628 Cov.: 32

Gnomad AFR AF: 0.310

Gnomad AMI AF: 0.0800

Gnomad AMR AF: 0.360

Gnomad ASJ AF: 0.155

Gnomad EAS AF: 0.543

Gnomad SAS AF: 0.303

Gnomad FIN AF: 0.100

Gnomad MID AF: 0.190

Gnomad NFE AF: 0.106

Gnomad OTH AF: 0.199

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

GnomAD4 genome AF: 0.210 AC: 31968 AN: 152148 Hom.: 4640 Cov.: 32 AF XY: 0.217 AC XY: 16160 AN XY: 74384

Gnomad4 AFR AF: 0.310

Gnomad4 AMR AF: 0.361

Gnomad4 ASJ AF: 0.155

Gnomad4 EAS AF: 0.542

Gnomad4 SAS AF: 0.302

Gnomad4 FIN AF: 0.100

Gnomad4 NFE AF: 0.106

Gnomad4 OTH AF: 0.204

Alfa AF: 0.158 Hom.: 351

Bravo AF: 0.238

Asia WGS AF: 0.417 AC: 1452 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
Cadd	Benign	5.7
Dann	Benign	0.89

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

Other links and lift over

dbSNP: rs2299618; hg19: chr11-2614722;