NM_000238.4(KCNH2):c.1017C>G (p.Asn339Lys) AND Long QT syndrome

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Jun 7, 2019
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:: RCV001212897.9

Allele description [Variation Report for NM_000238.4(KCNH2):c.1017C>G (p.Asn339Lys)]

NM_000238.4(KCNH2):c.1017C>G (p.Asn339Lys)

Gene:

KCNH2:potassium voltage-gated channel subfamily H member 2 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

7q36.1

Genomic location:

Preferred name:

NM_000238.4(KCNH2):c.1017C>G (p.Asn339Lys)

HGVS:

NC_000007.14:g.150957402G>C
NG_008916.1:g.25525C>G
NM_000238.4:c.1017C>GMANE SELECT
NM_001406753.1:c.729C>G
NM_001406755.1:c.840C>G
NM_001406756.1:c.729C>G
NM_001406757.1:c.717C>G
NM_172056.3:c.1017C>G
NP_000229.1:p.Asn339Lys
NP_000229.1:p.Asn339Lys
NP_001393682.1:p.Asn243Lys
NP_001393684.1:p.Asn280Lys
NP_001393685.1:p.Asn243Lys
NP_001393686.1:p.Asn239Lys
NP_742053.1:p.Asn339Lys
NP_742053.1:p.Asn339Lys
LRG_288t1:c.1017C>G
LRG_288t2:c.1017C>G
LRG_288:g.25525C>G
LRG_288p1:p.Asn339Lys
LRG_288p2:p.Asn339Lys
NC_000007.13:g.150654490G>C
NM_000238.3:c.1017C>G
NM_172056.2:c.1017C>G
NR_176254.1:n.1425C>G

Protein change:

N239K

Links:

dbSNP: rs1801410026

NCBI 1000 Genomes Browser:

rs1801410026

Molecular consequence:

NM_000238.4:c.1017C>G - missense variant - [Sequence Ontology: SO:0001583]
NM_001406753.1:c.729C>G - missense variant - [Sequence Ontology: SO:0001583]
NM_001406755.1:c.840C>G - missense variant - [Sequence Ontology: SO:0001583]
NM_001406756.1:c.729C>G - missense variant - [Sequence Ontology: SO:0001583]
NM_001406757.1:c.717C>G - missense variant - [Sequence Ontology: SO:0001583]
NM_172056.3:c.1017C>G - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

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

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV001384499	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jun 7, 2019)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV001384499

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jun 7, 2019)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV001384499.5

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site, but this prediction has not been confirmed by published transcriptional studies. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with KCNH2-related conditions. This sequence change replaces asparagine with lysine at codon 339 of the KCNH2 protein (p.Asn339Lys). The asparagine residue is weakly conserved and there is a moderate physicochemical difference between asparagine and lysine. This variant is not present in population databases (ExAC no frequency).

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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