VCV002435748.4 - ClinVar

NM_000334.4(SCN4A):c.5458G>A (p.Ala1820Thr)

Germline

Classification

The aggregate germline classification for this variant, typically for a monogenic or Mendelian disorder as in the ACMG/AMP guidelines, or for response to a drug. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the aggregate classification.

(3)

Stars represent the aggregate review status, or the level of review supporting the aggregate germline classification for this VCV record. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the review status. The number of submissions which contribute to this review status is shown in parentheses.

Uncertain significance

criteria provided, multiple submitters, no conflicts

Somatic

No data submitted for somatic clinical impact

Somatic

No data submitted for oncogenicity

Variant Details

Identifiers

NM_000334.4(SCN4A):c.5458G>A (p.Ala1820Thr)

Variation ID: 2435748 Accession: VCV002435748.4

Type and length

single nucleotide variant, 1 bp

Location

Cytogenetic: 17q23.3 17: 63940824 (GRCh38) [ NCBI UCSC ] 17: 62018184 (GRCh37) [ NCBI UCSC ]

Timeline in ClinVar

	First in ClinVar Help The date this variant first appeared in ClinVar with each type of classification.	Last submission Help The date of the most recent submission for each type of classification for this variant.	Last evaluated Help The most recent date that a submitter evaluated this variant for each type of classification.
Germline	Mar 5, 2023	Feb 14, 2024	Feb 10, 2023

HGVS

Nucleotide	Protein	Molecular consequence
NM_000334.4:c.5458G>A MANE Select Help Transcripts from the Matched Annotation from the NCBI and EMBL-EBI (MANE) collaboration.	NP_000325.4:p.Ala1820Thr	missense
NC_000017.11:g.63940824C>T
NC_000017.10:g.62018184C>T
NG_011699.1:g.37095G>A
NG_042788.1:g.23732C>T

... more HGVS ... less HGVS

Protein change

A1820T

Other names

Canonical SPDI

NC_000017.11:63940823:C:T

Functional consequence Help The effect of the variant on RNA or protein function, based on experimental evidence from submitters.

Global minor allele frequency (GMAF) Help The global minor allele frequency calculated by the 1000 Genomes Project. The minor allele at this location is indicated in parentheses and may be different from the allele represented by this VCV record.

Allele frequency Help The frequency of the allele represented by this VCV record.

Links

VarSome

Genes

Gene	OMIM	ClinGen Gene Dosage Sensitivity Curation		Variation Viewer Help Links to Variation Viewer, a genome browser to view variation data from NCBI databases.	Related variants
Gene	OMIM	HI score Help The haploinsufficiency score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team.	TS score Help The triplosensitivity score for the gene, curated by ClinGen’s Dosage Sensitivity Curation task team.		Within gene Help The number of variants in ClinVar that are contained within this gene, with a link to view the list of variants.	All Help The number of variants in ClinVar for this gene, including smaller variants within the gene and larger CNVs that overlap or fully contain the gene.
GH-LCR	-	-	-	GRCh38	-	1633
SCN4A		-	-	GRCh38 GRCh37	740	2055

Conditions - Germline

Condition Help The condition for this variant-condition (RCV) record in ClinVar.	Classification Help The aggregate germline classification for this variant-condition (RCV) record in ClinVar. The number of submissions that contribute to this aggregate classification is shown in parentheses. (# of submissions)	Review status Help The aggregate review status for this variant-condition (RCV) record in ClinVar. This value is calculated by NCBI based on data from submitters. Read our rules for calculating the review status.	Last evaluated Help The most recent date that a submitter evaluated this variant for the condition.	Variation/condition record Help The RCV accession number, with most recent version number, for the variant-condition record, with a link to the RCV web page.
Hypokalemic periodic paralysis, type 2	Uncertain significance (1)	no assertion criteria provided	Nov 24, 2023	RCV003444372.1
Familial hyperkalemic periodic paralysis	Uncertain significance (1)	criteria provided, single submitter	Feb 10, 2023	RCV003505301.2
not provided	Uncertain significance (1)	criteria provided, single submitter	Dec 2, 2019	RCV003136498.3

Submissions - Germline

Classification Help The submitted germline classification for each SCV record. (Last evaluated)	Review status Help Stars represent the review status, or the level of review supporting the submitted (SCV) record. This value is calculated by NCBI based on data from the submitter. Read our rules for calculating the review status. This column also includes a link to the submitter’s assertion criteria if provided, and the collection method. (Assertion criteria)	Condition Help The condition for the classification, provided by the submitter for this submitted (SCV) record. This column also includes the affected status and allele origin of individuals observed with this variant.	Submitter Help The submitting organization for this submitted (SCV) record. This column also includes the SCV accession and version number, the date this SCV first appeared in ClinVar, and the date that this SCV was last updated in ClinVar.	More information Help This column includes more information supporting the classification, including citations, the comment on classification, and detailed evidence provided as observations of the variant by the submitter.
Uncertain significance (Dec 02, 2019)	criteria provided, single submitter (ACMG Guidelines, 2015) Method: clinical testing	not provided Affected status: unknown Allele origin: germline	Revvity Omics, Revvity Accession: SCV003821275.2 First in ClinVar: Mar 04, 2023 Last updated: Feb 04, 2024
Uncertain significance (Feb 10, 2023)	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015)) Method: clinical testing	Familial hyperkalemic periodic paralysis Affected status: unknown Allele origin: germline	Labcorp Genetics (formerly Invitae), Labcorp Accession: SCV004275324.1 First in ClinVar: Feb 14, 2024 Last updated: Feb 14, 2024	Comment: This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 1820 of the SCN4A protein (p.Ala1820Thr). … (more) This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 1820 of the SCN4A protein (p.Ala1820Thr). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with SCN4A-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. (less)
Uncertain significance (Nov 24, 2023)	no assertion criteria provided Method: clinical testing	Hypokalemic periodic paralysis, type 2 Affected status: yes Allele origin: germline	Zotz-Klimas Genetics Lab, MVZ Zotz Klimas Accession: SCV004171673.1 First in ClinVar: Dec 02, 2023 Last updated: Dec 02, 2023

Comment:

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 1820 of the SCN4A protein (p.Ala1820Thr). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with SCN4A-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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.

Germline Functional Evidence

There is no functional evidence in ClinVar for this variation. If you have generated functional data for this variation, please consider submitting that data to ClinVar.

Comment:

Citations for germline classification of this variant

There are no citations for germline classification of this variant in ClinVar. If you know of citations for this variation, please consider submitting that information to ClinVar.

Text-mined citations for this variant ...

Record last updated Sep 30, 2024

ClinVar Genomic variation as it relates to human health

NM_000334.4(SCN4A):c.5458G>A (p.Ala1820Thr)

Variant Details

Genes

Conditions - Germline

Submissions - Germline

Germline Functional Evidence

Citations for germline classification of this variant

Text-mined citations for this variant ...