NM_003000.3(SDHB):c.659T>C (p.Ile220Thr) AND not provided

Germline classification:: Uncertain significance (3 submissions)
Last evaluated:: Mar 14, 2024
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

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:: RCV000713177.8

Allele description [Variation Report for NM_003000.3(SDHB):c.659T>C (p.Ile220Thr)]

NM_003000.3(SDHB):c.659T>C (p.Ile220Thr)

Gene:

SDHB:succinate dehydrogenase complex iron sulfur subunit B [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

1p36.13

Genomic location:

Preferred name:

NM_003000.3(SDHB):c.659T>C (p.Ile220Thr)

HGVS:

NC_000001.11:g.17022714A>G
NG_012340.1:g.36457T>C
NM_003000.3:c.659T>CMANE SELECT
NP_002991.2:p.Ile220Thr
NP_002991.2:p.Ile220Thr
LRG_316t1:c.659T>C
LRG_316:g.36457T>C
LRG_316p1:p.Ile220Thr
NC_000001.10:g.17349209A>G
NM_003000.2:c.659T>C

Protein change:

I220T

Links:

dbSNP: rs878854578

NCBI 1000 Genomes Browser:

rs878854578

Molecular consequence:

NM_003000.3:c.659T>C - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Synonyms:: none provided
Identifiers:: MedGen: C3661900

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000843762	Athena Diagnostics	criteria provided, single submitter (Athena Diagnostics Criteria)	Uncertain significance (Dec 29, 2017)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV001550343	Department of Pathology and Laboratory Medicine, Sinai Health System - The Canadian Open Genetics Repository (COGR) See additional submitters Franklin by Genoox	no assertion criteria provided	Uncertain significance	unknown	clinical testing
SCV002008409	GeneDx	criteria provided, single submitter (GeneDx Variant Classification Process June 2021)	Uncertain significance (Mar 14, 2024)	germline	clinical testing	Citation Link

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000843762

Athena Diagnostics

criteria provided, single submitter

(Athena Diagnostics Criteria)

Uncertain significance
(Dec 29, 2017)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

SCV001550343

Department of Pathology and Laboratory Medicine, Sinai Health System - The Canadian Open Genetics Repository (COGR)

See additional submitters

no assertion criteria provided

Uncertain significance

unknown

clinical testing

SCV002008409

GeneDx

criteria provided, single submitter

(GeneDx Variant Classification Process June 2021)

Uncertain significance
(Mar 14, 2024)

germline

clinical testing

Citation Link

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	yes	not provided	not provided	not provided	not provided	not provided	clinical testing
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing
not provided	unknown	yes	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

A Standardized DNA Variant Scoring System for Pathogenicity Assessments in Mendelian Disorders.

Karbassi I, Maston GA, Love A, DiVincenzo C, Braastad CD, Elzinga CD, Bright AR, Previte D, Zhang K, Rowland CM, McCarthy M, Lapierre JL, Dubois F, Medeiros KA, Batish SD, Jones J, Liaquat K, Hoffman CA, Jaremko M, Wang Z, Sun W, Buller-Burckle A, et al.

Hum Mutat. 2016 Jan;37(1):127-34. doi: 10.1002/humu.22918. Epub 2015 Oct 29.

PubMed [citation]

PMID:: 26467025
PMCID:: PMC4737317

Details of each submission

From Athena Diagnostics, SCV000843762.1

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

#	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

From Department of Pathology and Laboratory Medicine, Sinai Health System - The Canadian Open Genetics Repository (COGR), SCV001550343.1

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

Description

The SDHB p.Ile220Thr variant was not identified in the literature nor was it identified in Cosmic, LOVD 3.0 or in the following control databases: the 1000 Genomes Project, the NHLBI GO Exome Sequencing Project, or the Genome Aggregation Database (March 6, 2019, v2.1.1). The variant was identified in dbSNP (ID: rs878854578) and ClinVar (classified as uncertain significance by Athena Diagnostics, Ambry Genetics and Invitae). The p.Ile220 residue is conserved across mammals and other organisms, and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) suggest that the variant may impact the protein; however, this information is not predictive enough to assume pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	unknown	yes	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From GeneDx, SCV002008409.4

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

Description

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	yes	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Oct 8, 2024

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