NM_020822.3(KCNT1):c.1336A>C (p.Lys446Gln) AND multiple conditions

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Aug 27, 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:: RCV002004019.4

Allele description [Variation Report for NM_020822.3(KCNT1):c.1336A>C (p.Lys446Gln)]

NM_020822.3(KCNT1):c.1336A>C (p.Lys446Gln)

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.1336A>C (p.Lys446Gln)

HGVS:

NC_000009.12:g.135765759A>C
NG_033070.1:g.68575A>C
NM_001272003.2:c.1201A>C
NM_020822.3:c.1336A>CMANE SELECT
NP_001258932.1:p.Lys401Gln
NP_065873.2:p.Lys446Gln
NC_000009.11:g.138657605A>C
NM_020822.2:c.1336A>C

Protein change:

K401Q

Links:

dbSNP: rs144824627

NCBI 1000 Genomes Browser:

rs144824627

Molecular consequence:

NM_001272003.2:c.1201A>C - missense variant - [Sequence Ontology: SO:0001583]
NM_020822.3:c.1336A>C - 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

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV002290945	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Aug 27, 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

SCV002290945

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Aug 27, 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, SCV002290945.3

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

Description

This variant has not been reported in the literature in individuals affected with KCNT1-related conditions. 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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 1505354). This variant is present in population databases (rs144824627, gnomAD 0.003%). This sequence change replaces lysine, which is basic and polar, with glutamine, which is neutral and polar, at codon 446 of the KCNT1 protein (p.Lys446Gln).

#	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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