NM_000059.4(BRCA2):c.1966A>G (p.Thr656Ala) AND Hereditary breast ovarian cancer syndrome

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Nov 8, 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:: RCV000637334.8

Allele description [Variation Report for NM_000059.4(BRCA2):c.1966A>G (p.Thr656Ala)]

NM_000059.4(BRCA2):c.1966A>G (p.Thr656Ala)

Gene:

BRCA2:BRCA2 DNA repair associated [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

13q13.1

Genomic location:

Preferred name:

NM_000059.4(BRCA2):c.1966A>G (p.Thr656Ala)

HGVS:

NC_000013.11:g.32336321A>G
NG_012772.3:g.25842A>G
NM_000059.4:c.1966A>GMANE SELECT
NP_000050.2:p.Thr656Ala
NP_000050.3:p.Thr656Ala
LRG_293t1:c.1966A>G
LRG_293:g.25842A>G
LRG_293p1:p.Thr656Ala
NC_000013.10:g.32910458A>G
NM_000059.3:c.1966A>G

Nucleotide change:

2194A>G

Protein change:

T656A

Links:

dbSNP: rs398122736

NCBI 1000 Genomes Browser:

rs398122736

Molecular consequence:

NM_000059.4:c.1966A>G - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Hereditary breast ovarian cancer syndrome
Synonyms:: Hereditary breast and ovarian cancer syndrome; Hereditary breast and ovarian cancer; Hereditary breast and ovarian cancer syndrome (HBOC); See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0003582; MeSH: D061325; MedGen: C0677776; Orphanet: 145

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000758786	Invitae	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Nov 8, 2023)	germline	clinical testing	PubMed (2) [See all records that cite these PMIDs] 21120943, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000758786

Invitae

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Nov 8, 2023)

germline

clinical testing

PubMed (2)
[See all records that cite these PMIDs]

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

EMMA, a cost- and time-effective diagnostic method for simultaneous detection of point mutations and large-scale genomic rearrangements: application to BRCA1 and BRCA2 in 1,525 patients.

Caux-Moncoutier V, Castéra L, Tirapo C, Michaux D, Rémon MA, Laugé A, Rouleau E, De Pauw A, Buecher B, Gauthier-Villars M, Viovy JL, Stoppa-Lyonnet D, Houdayer C.

Hum Mutat. 2011 Mar;32(3):325-34. doi: 10.1002/humu.21414. Epub 2011 Feb 8.

PubMed [citation]

PMID:: 21120943

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):240-242.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Invitae, SCV000758786.7

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (2)

Description

This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 656 of the BRCA2 protein (p.Thr656Ala). This variant is present in population databases (rs398122736, gnomAD 0.0009%). This missense change has been observed in individual(s) with hereditary breast and ovarian cancer (PMID: 21120943). ClinVar contains an entry for this variant (Variation ID: 91765). 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 not expected to disrupt BRCA2 protein function with a negative predictive value of 95%. 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.

#	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: Mar 30, 2024

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