rs763462603
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000218.3(KCNQ1):c.524_534del(p.Leu175ArgfsTer106) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,460,332 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 33)
Exomes 𝑓: 0.0000021 ( 0 hom. )
Consequence
KCNQ1
NM_000218.3 frameshift
NM_000218.3 frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 9.42
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]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 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;
PP5
?
Variant 11-2570664-GTGGTCCGCCTC-G is Pathogenic according to our data. Variant chr11-2570664-GTGGTCCGCCTC-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 519537.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-2570664-GTGGTCCGCCTC-G is described in Lovd as [Pathogenic]. Variant chr11-2570664-GTGGTCCGCCTC-G is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
KCNQ1 | NM_000218.3 | c.524_534del | p.Leu175ArgfsTer106 | frameshift_variant | 3/16 | ENST00000155840.12 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
KCNQ1 | ENST00000155840.12 | c.524_534del | p.Leu175ArgfsTer106 | frameshift_variant | 3/16 | 1 | NM_000218.3 | P1 | |
KCNQ1 | ENST00000335475.6 | c.143_153del | p.Leu48ArgfsTer106 | frameshift_variant | 3/16 | 1 | |||
KCNQ1 | ENST00000496887.7 | c.263_273del | p.Leu88ArgfsTer106 | frameshift_variant | 4/16 | 5 | |||
KCNQ1 | ENST00000646564.2 | c.478-12761_478-12751del | intron_variant |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD3 genomes
?
Cov.:
33
GnomAD4 exome AF: 0.00000205 AC: 3AN: 1460332Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 726560
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GnomAD4 genome ? Cov.: 33
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Cov.:
33
ClinVar
Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
not provided Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Jul 21, 2020 | Identified in an individual referred for LQTS testing in published literature (Kapplinger et al., 2009); Not observed in large population cohorts (Lek et al., 2016); Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 19716085) - |
Long QT syndrome Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Oct 15, 2023 | This sequence change creates a premature translational stop signal (p.Leu175Argfs*106) in the KCNQ1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in KCNQ1 are known to be pathogenic (PMID: 9323054, 19862833). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with long QT syndrome (PMID: 19716085). ClinVar contains an entry for this variant (Variation ID: 519537). For these reasons, this variant has been classified as Pathogenic. - |
Cardiovascular phenotype Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Nov 17, 2017 | The c.524_534del11 pathogenic mutation, located in coding exon 3 of the KCNQ1 gene, results from a deletion of 11 nucleotides at nucleotide positions 524 to 534, causing a translational frameshift with a predicted alternate stop codon (p.L175Rfs*106). In a study of long QT syndrome clinical genetic testing, this alteration (also referred to as R174fs+105X) was reported in one patient; however, clinical details were limited (Kapplinger JD et al. Heart Rhythm, 2009 Sep;6:1297-303). In addition, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. - |
Computational scores
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Find out detailed SpliceAI scores and Pangolin per-transcript scores at