11-2445458-G-GA

Position:

• chr11-2445458-G-GA

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_000218.3(KCNQ1):​c.363dup​(p.Cys122MetfsTer163) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as not provided (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCNQ1 NM_000218.3 frameshift
• Clinical Significance: not provided no classification provided O:1
• Conservation: PhyloP100: 6.29

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 Pathogenic. Variant got 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNQ1	NM_000218.3	c.363dup	p.Cys122MetfsTer163	frameshift_variant	1/16	ENST00000155840.12	NP_000209.2
KCNQ1	NM_001406836.1	c.363dup	p.Cys122MetfsTer163	frameshift_variant	1/15		NP_001393765.1
KCNQ1	NM_001406838.1	c.363dup	p.Cys122MetfsTer161	frameshift_variant	1/11		NP_001393767.1
KCNQ1	NM_001406837.1	c.1dup		5_prime_UTR_variant	1/17		NP_001393766.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNQ1	ENST00000155840.12	c.363dup	p.Cys122MetfsTer163	frameshift_variant	1/16	1	NM_000218.3	ENSP00000155840	P1
KCNQ1	ENST00000345015.4	n.140dup		non_coding_transcript_exon_variant	1/3	1
KCNQ1	ENST00000496887.7	c.102dup	p.Cys35MetfsTer163	frameshift_variant	2/16	5		ENSP00000434560
KCNQ1	ENST00000646564.2	c.363dup	p.Cys122MetfsTer161	frameshift_variant	1/11			ENSP00000495806

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: not provided

Submissions summary: Other:1

Revision: no classification provided

Submissions by phenotype

Long QT syndrome 1 Other:1

not provided, no classification provided

literature only

ClinVar Staff, National Center for Biotechnology Information (NCBI)

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Computational scores

Source: dbNSFP v4.3

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: rs1554958119; hg19: chr11-2466688;