NM_004519.4(KCNQ3):c.1958A>G (p.Gln653Arg) AND Seizures, benign familial neonatal, 2

Germline classification:
Benign (1 submission)
Last evaluated:
Jan 13, 2018
Review status:
1 star out of maximum of 4 stars
criteria provided, single submitter
Somatic classification
of clinical impact:
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Somatic classification
of oncogenicity:
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Record status:

Allele description [Variation Report for NM_004519.4(KCNQ3):c.1958A>G (p.Gln653Arg)]

NM_004519.4(KCNQ3):c.1958A>G (p.Gln653Arg)

KCNQ3:potassium voltage-gated channel subfamily Q member 3 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
Genomic location:
Preferred name:
NM_004519.4(KCNQ3):c.1958A>G (p.Gln653Arg)
Other names:
  • NC_000008.11:g.132129923T>C
  • NG_008854.2:g.355835A>G
  • NM_001204824.2:c.1598A>G
  • NM_004519.4:c.1958A>GMANE SELECT
  • NP_001191753.1:p.Gln533Arg
  • NP_004510.1:p.Gln653Arg
  • NC_000008.10:g.133142170T>C
  • NM_004519.2:c.1958A>G
  • NM_004519.3:c.1958A>G
Protein change:
dbSNP: rs554833870
NCBI 1000 Genomes Browser:
Molecular consequence:
  • NM_001204824.2:c.1598A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_004519.4:c.1958A>G - missense variant - [Sequence Ontology: SO:0001583]


Seizures, benign familial neonatal, 2
CONVULSIONS, BENIGN FAMILIAL NEONATAL, 2; Seizures, benign neonatal, 2; Benign Neonatal Epilepsy 2; See all synonyms [MedGen]
MONDO: MONDO:0007366; MedGen: C1852581; Orphanet: 1949; OMIM: 121201

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Assertion and evidence details

Submission AccessionSubmitterReview Status
(Assertion method)
Clinical Significance
(Last evaluated)
SCV000471908Illumina Laboratory Services, Illumina
criteria provided, single submitter

(ICSL Variant Classification Criteria 13 December 2019)
(Jan 13, 2018)
germlineclinical testing

Citation Link

Summary from all submissions

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

Details of each submission

From Illumina Laboratory Services, Illumina, SCV000471908.3

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


This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.

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

Last Updated: Jul 7, 2024