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NM_004975.4(KCNB1):c.1289T>C (p.Ile430Thr) AND Developmental and epileptic encephalopathy, 26

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Nov 23, 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:
RCV003749523.2

Allele description [Variation Report for NM_004975.4(KCNB1):c.1289T>C (p.Ile430Thr)]

NM_004975.4(KCNB1):c.1289T>C (p.Ile430Thr)

Gene:
KCNB1:potassium voltage-gated channel subfamily B member 1 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
20q13.13
Genomic location:
Preferred name:
NM_004975.4(KCNB1):c.1289T>C (p.Ile430Thr)
HGVS:
  • NC_000020.11:g.49374271A>G
  • NG_041781.2:g.113374T>C
  • NM_004975.4:c.1289T>CMANE SELECT
  • NP_004966.1:p.Ile430Thr
  • NC_000020.10:g.47990808A>G
Protein change:
I430T
Molecular consequence:
  • NM_004975.4:c.1289T>C - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:
Developmental and epileptic encephalopathy, 26 (DEE26)
Synonyms:
Epileptic encephalopathy, early infantile, 26
Identifiers:
MONDO: MONDO:0014477; MedGen: C4015119; Orphanet: 442835; OMIM: 616056

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Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV004408378Labcorp Genetics (formerly Invitae), Labcorp
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Uncertain significance
(Nov 23, 2022) 		germlineclinical testing

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

Help

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical 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, SCV004408378.1

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical 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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on KCNB1 protein function. This variant has not been reported in the literature in individuals affected with KCNB1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 430 of the KCNB1 protein (p.Ile430Thr).

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

Last Updated: Sep 29, 2024