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NM_000218.3(KCNQ1):c.1456G>A (p.Ala486Thr) AND KCNQ1-related disorder

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Mar 26, 2024
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
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:
RCV004733172.1

Allele description [Variation Report for NM_000218.3(KCNQ1):c.1456G>A (p.Ala486Thr)]

NM_000218.3(KCNQ1):c.1456G>A (p.Ala486Thr)

Genes:
KCNQ1OT1:KCNQ1 opposite strand/antisense transcript 1 [Gene - OMIM - HGNC]
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.1456G>A (p.Ala486Thr)
HGVS:
  • NC_000011.10:g.2662023G>A
  • NG_008935.1:g.222033G>A
  • NG_016178.2:g.42976C>T
  • NM_000218.3:c.1456G>AMANE SELECT
  • NM_001406836.1:c.1360G>A
  • NM_001406837.1:c.1186G>A
  • NM_001406838.1:c.916G>A
  • NM_181798.2:c.1075G>A
  • NP_000209.2:p.Ala486Thr
  • NP_000209.2:p.Ala486Thr
  • NP_001393765.1:p.Ala454Thr
  • NP_001393766.1:p.Ala396Thr
  • NP_001393767.1:p.Ala306Thr
  • NP_861463.1:p.Ala359Thr
  • NP_861463.1:p.Ala359Thr
  • LRG_1052t1:n.37976C>T
  • LRG_287t1:c.1456G>A
  • LRG_287t2:c.1075G>A
  • LRG_1052:g.42976C>T
  • LRG_287:g.222033G>A
  • LRG_287p1:p.Ala486Thr
  • LRG_287p2:p.Ala359Thr
  • NC_000011.9:g.2683253G>A
  • NC_000011.9:g.2683253G>A
  • NM_000218.2:c.1456G>A
  • NM_181798.1:c.1075G>A
  • NR_002728.3:n.37976C>T
  • NR_002728.4:n.37972C>TMANE SELECT
  • NR_040711.2:n.1349G>A
Protein change:
A306T
Links:
dbSNP: rs753256800
Molecular consequence:
  • NM_000218.3:c.1456G>A - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001406836.1:c.1360G>A - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001406837.1:c.1186G>A - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001406838.1:c.916G>A - missense variant - [Sequence Ontology: SO:0001583]
  • NM_181798.2:c.1075G>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:
KCNQ1-related disorder
Synonyms:
KCNQ1-related condition; KCNQ1-related disorders
Identifiers:
MedGen: CN239322

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Assertion and evidence details

Submission AccessionSubmitterReview Status
(Assertion method)
Clinical Significance
(Last evaluated)
OriginMethodCitations
SCV005357954PreventionGenetics, part of Exact Sciences
no assertion criteria provided
Uncertain significance
(Mar 26, 2024)
germlineclinical testing

Summary from all submissions

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

Details of each submission

From PreventionGenetics, part of Exact Sciences, SCV005357954.1

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testingnot provided

Description

The KCNQ1 c.1456G>A variant is predicted to result in the amino acid substitution p.Ala486Thr. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.020% of alleles in individuals of South Asian descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence.

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

Last Updated: Apr 12, 2026

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