chr11-2583530-CTTT-C

Position:

• chr11-2583530-CTTT-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PM4_Supporting PP5

The NM_000218.3(KCNQ1):​c.1018_1020delTTT​(p.Phe340del) variant causes a conservative inframe deletion change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: KCNQ1 NM_000218.3 conservative_inframe_deletion
• Clinical Significance: Pathogenic no assertion criteria provided P:1 O:1
• Conservation: PhyloP100: 7.52

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 Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a mutagenesis_site Inhibits voltage-gated potassium channel activity. (size 0) in uniprot entity KCNQ1_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_000218.3
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_000218.3. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 11-2583530-CTTT-C is Pathogenic according to our data. Variant chr11-2583530-CTTT-C is described in ClinVar as [Pathogenic]. Clinvar id is 52931.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr11-2583530-CTTT-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNQ1	NM_000218.3	c.1018_1020delTTT	p.Phe340del	conservative_inframe_deletion	7/16	ENST00000155840.12	NP_000209.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNQ1	ENST00000155840.12	c.1018_1020delTTT	p.Phe340del	conservative_inframe_deletion	7/16	1	NM_000218.3	ENSP00000155840.2
KCNQ1	ENST00000335475.6	c.637_639delTTT	p.Phe213del	conservative_inframe_deletion	7/16	1		ENSP00000334497.5
KCNQ1	ENST00000496887.7	c.757_759delTTT	p.Phe253del	conservative_inframe_deletion	8/16	5		ENSP00000434560.2
KCNQ1	ENST00000646564.2	c.574_576delTTT	p.Phe192del	conservative_inframe_deletion	3/11			ENSP00000495806.2

Frequencies

GnomAD3 genomes Cov.: 33

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

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: no assertion criteria provided

Submissions by phenotype

Long QT syndrome 1 Pathogenic:1 Other:1

not provided, no classification provided	literature only	ClinVar Staff, National Center for Biotechnology Information (NCBI)	-	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Aug 01, 1998	- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs397508069; hg19: chr11-2604760;