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NM_000218.3(KCNQ1):c.477+4C>T AND Long QT syndrome

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Apr 28, 2022
Review status:
1 star out of maximum of 4 stars
criteria provided, single submitter
Somatic classification
of clinical impact:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Somatic classification
of oncogenicity:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Record status:
current
Accession:
RCV002536083.9

Allele description [Variation Report for NM_000218.3(KCNQ1):c.477+4C>T]

NM_000218.3(KCNQ1):c.477+4C>T

Gene:
KCNQ1:potassium voltage-gated channel subfamily Q member 1 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
11p15.5
Genomic location:
Preferred name:
NM_000218.3(KCNQ1):c.477+4C>T
HGVS:
  • NC_000011.10:g.2528022C>T
  • NG_008935.1:g.88032C>T
  • NM_000218.3:c.477+4C>TMANE SELECT
  • NM_001406836.1:c.477+4C>T
  • NM_001406837.1:c.207+4C>T
  • NM_001406838.1:c.477+4C>T
  • NM_181798.2:c.96+4C>T
  • LRG_287t1:c.477+4C>T
  • LRG_287:g.88032C>T
  • NC_000011.9:g.2549252C>T
  • NC_000011.9:g.2549252C>T
  • NM_000218.2:c.477+4C>T
Links:
dbSNP: rs763599970
NCBI 1000 Genomes Browser:
rs763599970
Molecular consequence:
  • NM_000218.3:c.477+4C>T - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001406836.1:c.477+4C>T - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001406837.1:c.207+4C>T - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001406838.1:c.477+4C>T - intron variant - [Sequence Ontology: SO:0001627]
  • NM_181798.2:c.96+4C>T - intron variant - [Sequence Ontology: SO:0001627]

Condition(s)

Name:
Long QT syndrome (LQTS)
Identifiers:
MONDO: MONDO:0002442; MeSH: D008133; MedGen: C0023976

Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV003439591Labcorp Genetics (formerly Invitae), Labcorp
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Uncertain significance
(Apr 28, 2022) 		germlineclinical testing

PubMed (4)
[See all records that cite these PMIDs]

Help

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical testing

Citations

PubMed

Diagnostic Approach to Unexplained Cardiac Arrest (from the FIVI-Gen Study).

Jiménez-Jáimez J, Peinado R, Grima EZ, Segura F, Moriña P, Sánchez Muñoz JJ, Mazuelos F, Cózar R, Gimeno JR, Heras RP, Monserrat L, Domingo D, Ortiz-Genga M, Fernández Pastor J, Álvarez M, Tercedor L.

Am J Cardiol. 2015 Sep 15;116(6):894-9. doi: 10.1016/j.amjcard.2015.06.030. Epub 2015 Jun 27.

PubMed [citation]
PMID:
26189708

Aberrant 5' splice sites in human disease genes: mutation pattern, nucleotide structure and comparison of computational tools that predict their utilization.

Buratti E, Chivers M, Královicová J, Romano M, Baralle M, Krainer AR, Vorechovsky I.

Nucleic Acids Res. 2007;35(13):4250-63. Epub 2007 Jun 18.

PubMed [citation]
PMID:
17576681
PMCID:
PMC1934990
See all PubMed Citations (4)

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV003439591.1

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testing PubMed (4)

Description

This sequence change falls in intron 2 of the KCNQ1 gene. It does not directly change the encoded amino acid sequence of the KCNQ1 protein. It affects a nucleotide within the consensus splice site. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has been observed in individual(s) with KCNQ1-related conditions (PMID: 26189708). ClinVar contains an entry for this variant (Variation ID: 667573). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Oct 13, 2024