VCV001073749.2 - ClinVar

NC_000020.10:g.(?_62076002)_(62324646_?)del

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.

(1)

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.

Pathogenic

criteria provided, single submitter

Somatic

No data submitted for somatic clinical impact

Somatic

No data submitted for oncogenicity

Variant Details

Identifiers

NC_000020.10:g.(?_62076002)_(62324646_?)del

Variation ID: 1073749 Accession: VCV001073749.2

Type and length

Deletion, 248,645 bp

Location

Cytogenetic: 20q13.33 20: 62076002-62324646 (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	May 10, 2021	May 10, 2021	Aug 14, 2020

HGVS

Nucleotide	Protein	Molecular consequence
NC_000020.10:g.(?_62076002)_(62324646_?)del

Protein change

Other names

Canonical SPDI

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.
KCNQ2		Sufficient evidence for dosage pathogenicity	No evidence available	GRCh38 GRCh38 GRCh37	2153	2284
EEF1A2		No evidence available	No evidence available	GRCh38 GRCh37	509	670
FNDC11	-	-	-	GRCh38 GRCh37	4	83
GMEB2		-	-	GRCh38 GRCh37	23	106
HELZ2		-	-	GRCh38 GRCh37	289	382
PPDPF	-	-	-	GRCh38 GRCh37	16	104
PTK6		-	-	GRCh38 GRCh37	46	127
RTEL1		-	-	GRCh38 GRCh37	23	3340
SRMS		-	-	GRCh38 GRCh37	46	125
STMN3		-	-	GRCh38 GRCh37	10	81

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.
Early infantile epileptic encephalopathy with suppression bursts	Pathogenic (1)	criteria provided, single submitter	Aug 14, 2020	RCV001386825.3

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.
Pathogenic (Aug 14, 2020)	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015)) Method: clinical testing	Early infantile epileptic encephalopathy with suppression bursts Affected status: unknown Allele origin: germline	Labcorp Genetics (formerly Invitae), Labcorp Accession: SCV001587190.1 First in ClinVar: May 10, 2021 Last updated: May 10, 2021	Publications: PubMed (2) PubMed: 19822871‚ 14534157 Comment: This variant is a gross deletion of the genomic region encompassing exons 1-4 of the KCNQ2 gene, which includes the initiator codon. The 5' end … (more) This variant is a gross deletion of the genomic region encompassing exons 1-4 of the KCNQ2 gene, which includes the initiator codon. The 5' end of this event is unknown as it extends beyond the assayed region for this gene and therefore may encompass additional genes. The 3' boundary is likely confined to intron 4 of the KCNQ2 gene. This is expected to result in an absent or disrupted protein product. A deletion encompassing exons 1-4 of KCNQ2, as well as several upstream genes, has been reported in a family affected with benign familial neonatal seizures (PMID: 19822871). Loss-of-function variants in KCNQ2 are known to be pathogenic (PMID: 14534157). For these reasons, this variant has been classified as Pathogenic. (less)

Comment:

This variant is a gross deletion of the genomic region encompassing exons 1-4 of the KCNQ2 gene, which includes the initiator codon. The 5' end of this event is unknown as it extends beyond the assayed region for this gene and therefore may encompass additional genes. The 3' boundary is likely confined to intron 4 of the KCNQ2 gene. This is expected to result in an absent or disrupted protein product. A deletion encompassing exons 1-4 of KCNQ2, as well as several upstream genes, has been reported in a family affected with benign familial neonatal seizures (PMID: 19822871). Loss-of-function variants in KCNQ2 are known to be pathogenic (PMID: 14534157). For these reasons, this variant has been classified as Pathogenic.

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

Title	Author	Journal	Year	Link
Deletions involving both KCNQ2 and CHRNA4 present with benign familial neonatal seizures.	Kurahashi H	Neurology	2009	PMID: 19822871
KCNQ2 and KCNQ3 potassium channel genes in benign familial neonatal convulsions: expansion of the functional and mutation spectrum.	Singh NA	Brain : a journal of neurology	2003	PMID: 14534157

Text-mined citations for this variant ...

Record last updated Sep 29, 2024

ClinVar Genomic variation as it relates to human health

NC_000020.10:g.(?_62076002)_(62324646_?)del

Variant Details

Genes

Conditions - Germline

Submissions - Germline

Germline Functional Evidence

Citations for germline classification of this variant

Text-mined citations for this variant ...