NM_020822.3(KCNT1):c.1281G>T (p.Gln427His) AND multiple conditions

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Jun 6, 2023
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:: RCV003809404.2

Allele description [Variation Report for NM_020822.3(KCNT1):c.1281G>T (p.Gln427His)]

NM_020822.3(KCNT1):c.1281G>T (p.Gln427His)

Gene:

KCNT1:potassium sodium-activated channel subfamily T member 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

9q34.3

Genomic location:

Preferred name:

NM_020822.3(KCNT1):c.1281G>T (p.Gln427His)

HGVS:

NC_000009.12:g.135765704G>T
NG_033070.1:g.68520G>T
NG_033070.2:g.68520G>T
NM_001272003.2:c.1146G>T
NM_020822.3:c.1281G>TMANE SELECT
NP_001258932.1:p.Gln382His
NP_065873.2:p.Gln427His
NC_000009.11:g.138657550G>T

Protein change:

Q382H

Molecular consequence:

NM_001272003.2:c.1146G>T - missense variant - [Sequence Ontology: SO:0001583]
NM_020822.3:c.1281G>T - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Developmental and epileptic encephalopathy, 14 (DEE14)
Synonyms:: Early infantile epileptic encephalopathy 14
Identifiers:: MONDO: MONDO:0013989; MedGen: C3554195; Orphanet: 293181; OMIM: 614959

Name:: Autosomal dominant nocturnal frontal lobe epilepsy 5
Synonyms:: Epilepsy, nocturnal frontal lobe, 5; CILIARY DYSKINESIA, PRIMARY, 28, WITHOUT SITUS INVERSUS; CILIARY DYSKINESIA, PRIMARY, 28, WITH SITUS INVERSUS
Identifiers:: MONDO: MONDO:0014002; MedGen: C3554306; Orphanet: 98784; OMIM: 615005

Recent activity

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PIERCE2 piercer of microtubule wall 2 [Homo sapiens]
PIERCE2 piercer of microtubule wall 2 [Homo sapiens]
Gene ID:145788

Gene
145788[uid] AND (alive[prop]) (1)
Gene

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV004595446	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jun 6, 2023)	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

SCV004595446

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jun 6, 2023)

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, SCV004595446.1

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

Description

This sequence change replaces glutamine, which is neutral and polar, with histidine, which is basic and polar, at codon 427 of the KCNT1 protein (p.Gln427His). 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) performed at Invitae indicates that this missense variant is not expected to disrupt KCNT1 protein function. This variant has not been reported in the literature in individuals affected with KCNT1-related conditions. This variant is not present in population databases (gnomAD 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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