VCV002950703.2 - ClinVar

NM_003000.3(SDHB):c.654G>C (p.Trp218Cys)

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.

(2)

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.

Conflicting classifications of pathogenicity
Likely pathogenic(1); Uncertain significance(1)

criteria provided, conflicting classifications

Somatic

No data submitted for somatic clinical impact

Somatic

No data submitted for oncogenicity

Variant Details

Identifiers

NM_003000.3(SDHB):c.654G>C (p.Trp218Cys)

Variation ID: 2950703 Accession: VCV002950703.2

Type and length

single nucleotide variant, 1 bp

Location

Cytogenetic: 1p36.13 1: 17022719 (GRCh38) [ NCBI UCSC ] 1: 17349214 (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	Feb 29, 2024	May 1, 2024	Mar 8, 2024

HGVS

Nucleotide	Protein	Molecular consequence
NM_003000.3:c.654G>C MANE Select Help Transcripts from the Matched Annotation from the NCBI and EMBL-EBI (MANE) collaboration.	NP_002991.2:p.Trp218Cys	missense
NM_001407361.1:c.600G>C	NP_001394290.1:p.Trp200Cys	missense
NC_000001.11:g.17022719C>G
NC_000001.10:g.17349214C>G
NG_012340.1:g.36452G>C
LRG_316:g.36452G>C
LRG_316t1:c.654G>C	LRG_316p1:p.Trp218Cys

... more HGVS ... less HGVS

Protein change

W200C, W218C

Other names

Canonical SPDI

NC_000001.11:17022718:C:G

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.
SDHB		Sufficient evidence for dosage pathogenicity	No evidence available	GRCh38 GRCh38 GRCh37	1329	1447

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.
Gastrointestinal stromal tumor Paragangliomas 4 Pheochromocytoma	Uncertain significance (1)	criteria provided, single submitter	Aug 21, 2023	RCV003810013.2
Hereditary cancer-predisposing syndrome	Likely pathogenic (1)	criteria provided, single submitter	Mar 8, 2024	RCV004366668.1

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 (Aug 21, 2023)	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015)) Method: clinical testing	Gastrointestinal stromal tumor Paragangliomas 4 Pheochromocytoma Explanation for multiple conditions: Uncertain. The variant was classified for several related diseases, possibly a spectrum of disease; the variant may be associated with one or more the diseases. Affected status: unknown Allele origin: germline	Labcorp Genetics (formerly Invitae), Labcorp Accession: SCV004607870.1 First in ClinVar: Feb 28, 2024 Last updated: Feb 28, 2024	Comment: 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) … (more) 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 expected to disrupt SDHB 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. This variant has not been reported in the literature in individuals affected with SDHB-related conditions. This sequence change replaces tryptophan, which is neutral and slightly polar, with cysteine, which is neutral and slightly polar, at codon 218 of the SDHB protein (p.Trp218Cys). This variant is not present in population databases (gnomAD no frequency). (less)
Likely pathogenic (Mar 08, 2024)	criteria provided, single submitter (Ambry Variant Classification Scheme 2023) Method: clinical testing	Hereditary cancer-predisposing syndrome Affected status: unknown Allele origin: germline	Ambry Genetics Accession: SCV005020182.1 First in ClinVar: May 01, 2024 Last updated: May 01, 2024	Comment: The p.W218C variant (also known as c.654G>C), located in coding exon 7 of the SDHB gene, results from a G to C substitution at nucleotide … (more) The p.W218C variant (also known as c.654G>C), located in coding exon 7 of the SDHB gene, results from a G to C substitution at nucleotide position 654. The tryptophan at codon 218 is replaced by cysteine, an amino acid with highly dissimilar properties. Another alteration at the same codon, p.W218S (c.653G>C), has been identified in multiple individuals with paragangliomas (Bayley JP et al. BMC Med. Genet., 2006 Jan;7:1). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the majority of available evidence to date, this variant is likely to be pathogenic. (less)

Comment:

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 expected to disrupt SDHB 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. This variant has not been reported in the literature in individuals affected with SDHB-related conditions. This sequence change replaces tryptophan, which is neutral and slightly polar, with cysteine, which is neutral and slightly polar, at codon 218 of the SDHB protein (p.Trp218Cys). This variant is not present in population databases (gnomAD no frequency).

Comment:

The p.W218C variant (also known as c.654G>C), located in coding exon 7 of the SDHB gene, results from a G to C substitution at nucleotide position 654. The tryptophan at codon 218 is replaced by cysteine, an amino acid with highly dissimilar properties. Another alteration at the same codon, p.W218S (c.653G>C), has been identified in multiple individuals with paragangliomas (Bayley JP et al. BMC Med. Genet., 2006 Jan;7:1). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the majority of available evidence to date, this variant is likely to be 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

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_003000.3(SDHB):c.654G>C (p.Trp218Cys)

Variant Details

Genes

Conditions - Germline

Submissions - Germline

Germline Functional Evidence

Citations for germline classification of this variant

Text-mined citations for this variant ...