rs231362

Positions:

• chr11-2670241-A-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The ENST00000155840.12(KCNQ1):​c.1514+8160A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.597 in 398,376 control chromosomes in the GnomAD database, including 74,265 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.63 (31027 hom., cov: 32)
  • Exomes 𝑓: 0.58 (43238 hom.)
• Consequence: KCNQ1 ENST00000155840.12 intron
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -0.707

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]

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.97).
• BP6: Variant 11-2670241-A-G is Benign according to our data. Variant chr11-2670241-A-G is described in ClinVar as [Benign]. Clinvar id is 1256894.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.874 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNQ1	NM_000218.3	c.1514+8160A>G		intron_variant		ENST00000155840.12	NP_000209.2
KCNQ1OT1	NR_002728.3	n.29758T>C		non_coding_transcript_exon_variant	1/1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNQ1	ENST00000155840.12	c.1514+8160A>G		intron_variant		1	NM_000218.3	ENSP00000155840	P1
KCNQ1OT1	ENST00000710656.1	n.375+29087T>C		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes AF: 0.625 AC: 94954 AN: 151936 Hom.: 30982 Cov.: 32

Gnomad AFR AF: 0.782

Gnomad AMI AF: 0.417

Gnomad AMR AF: 0.649

Gnomad ASJ AF: 0.634

Gnomad EAS AF: 0.895

Gnomad SAS AF: 0.750

Gnomad FIN AF: 0.514

Gnomad MID AF: 0.551

Gnomad NFE AF: 0.515

Gnomad OTH AF: 0.618

GnomAD4 exome AF: 0.579 AC: 142692 AN: 246322 Hom.: 43238 Cov.: 0 AF XY: 0.577 AC XY: 72040 AN XY: 124814

Gnomad4 AFR exome AF: 0.773

Gnomad4 AMR exome AF: 0.670

Gnomad4 ASJ exome AF: 0.626

Gnomad4 EAS exome AF: 0.901

Gnomad4 SAS exome AF: 0.763

Gnomad4 FIN exome AF: 0.508

Gnomad4 NFE exome AF: 0.520

Gnomad4 OTH exome AF: 0.605

GnomAD4 genome AF: 0.625 AC: 95063 AN: 152054 Hom.: 31027 Cov.: 32 AF XY: 0.630 AC XY: 46815 AN XY: 74316

Gnomad4 AFR AF: 0.782

Gnomad4 AMR AF: 0.649

Gnomad4 ASJ AF: 0.634

Gnomad4 EAS AF: 0.895

Gnomad4 SAS AF: 0.751

Gnomad4 FIN AF: 0.514

Gnomad4 NFE AF: 0.515

Gnomad4 OTH AF: 0.621

Alfa AF: 0.542 Hom.: 27954

Bravo AF: 0.644

Asia WGS AF: 0.793 AC: 2757 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 24, 2021	This variant is associated with the following publications: (PMID: 26911676) -

KCNQ1-related disorder Benign:1

Benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 03, 2019

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.97
CADD	Benign	0.072
DANN	Benign	0.53

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: rs231362; hg19: chr11-2691471;