13-32337975-A-G

Variant names:

• chr13-32337975-A-G
• rs397507310
• NM_000059.4:c.3620A>G

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_Moderate BP6

The NM_000059.4(BRCA2):​c.3620A>G​(p.Tyr1207Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000123 in 1,461,406 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. Y1207Y) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: BRCA2 NM_000059.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4 B:2
• Conservation: PhyloP100: -0.913
• Publications: 8 publications found

Genes affected

BRCA2 (HGNC:1101): (BRCA2 DNA repair associated) Inherited mutations in BRCA1 and this gene, BRCA2, confer increased lifetime risk of developing breast or ovarian cancer. Both BRCA1 and BRCA2 are involved in maintenance of genome stability, specifically the homologous recombination pathway for double-strand DNA repair. The largest exon in both genes is exon 11, which harbors the most important and frequent mutations in breast cancer patients. The BRCA2 gene was found on chromosome 13q12.3 in human. The BRCA2 protein contains several copies of a 70 aa motif called the BRC motif, and these motifs mediate binding to the RAD51 recombinase which functions in DNA repair. BRCA2 is considered a tumor suppressor gene, as tumors with BRCA2 mutations generally exhibit loss of heterozygosity (LOH) of the wild-type allele. [provided by RefSeq, May 2020]

BRCA2 Gene-Disease associations (from GenCC):

• breast-ovarian cancer, familial, susceptibility to, 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), ClinGen
• Fanconi anemia complementation group D1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, G2P
• pancreatic cancer, susceptibility to, 2

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• sarcoma

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• hereditary breast ovarian cancer syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Fanconi anemia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• medulloblastoma

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.16253915).
• BP6: Variant 13-32337975-A-G is Benign according to our data. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848. Variant chr13-32337975-A-G is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 37848.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.3620A>G	p.Tyr1207Cys	missense_variant	Exon 11 of 27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.3620A>G	p.Tyr1207Cys	missense_variant	Exon 11 of 27	5	NM_000059.4	ENSP00000369497.3
BRCA2	ENST00000530893.7	c.3251A>G	p.Tyr1084Cys	missense_variant	Exon 11 of 27	1		ENSP00000499438.2
BRCA2	ENST00000614259.2	n.3620A>G		non_coding_transcript_exon_variant	Exon 10 of 26	2		ENSP00000506251.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000399 AC: 1 AN: 250896 AF XY: 0.00000737

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000881

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000123 AC: 18 AN: 1461406 Hom.: 0 Cov.: 35 AF XY: 0.0000110 AC XY: 8 AN XY: 726922

African (AFR) AF: 0.00 AC: 0 AN: 33452

American (AMR) AF: 0.00 AC: 0 AN: 44696

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26118

East Asian (EAS) AF: 0.00 AC: 0 AN: 39684

South Asian (SAS) AF: 0.00 AC: 0 AN: 86222

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53400

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000162 AC: 18 AN: 1111688

Other (OTH) AF: 0.00 AC: 0 AN: 60378

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000223 Hom.: 0

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:2

Dec 28, 2023

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Mar 23, 2023

University of Washington Department of Laboratory Medicine, University of Washington

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: curation

Missense variant in a coldspot region where missense variants are very unlikely to be pathogenic (PMID:31911673). -

Jul 28, 2021

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces tyrosine with cysteine at codon 1207 of the BRCA2 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in a breast cancer case-control meta-analysis in 1/60465 cases and 1/53460 unaffected individuals (PMID: 33471991; Leiden Open Variation Database DB-ID BRCA2_008086). This variant has been identified in 1/250896 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Breast-ovarian cancer, familial, susceptibility to, 2 Uncertain:1

Feb 05, 2009

Sharing Clinical Reports Project (SCRP)

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided Uncertain:1

Oct 09, 2015

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is denoted BRCA2 c.3620A>G at the cDNA level, p.Tyr1207Cys (Y1207C) at the protein level, and results in the change of a Tyrosine to a Cysteine (TAT>TGT). Using alternate nomenclature, this variant would be defined as BRCA2 3848A>G. This variant has not, to our knowledge, been published in the literature as being pathogenic or benign. BRCA2 Tyr1207Cys was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. Since Tyrosine and Cysteine differ in polarity, charge, size or other properties, this is considered a non-conservative amino acid substitution. BRCA2 Tyr1207Cys occurs at a position that is not conserved and is not located in a known functional domain (UniProt). In silico analyses predict that this variant is unlikely to alter protein structure or function. Based on currently available evidence, it is unclear whether BRCA2 Tyr1207Cys is pathogenic or benign. -

Hereditary breast ovarian cancer syndrome Uncertain:1

Apr 13, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces tyrosine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 1207 of the BRCA2 protein (p.Tyr1207Cys). 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 BRCA2-related conditions. ClinVar contains an entry for this variant (Variation ID: 37848). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.082
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	4.1
DANN	Benign	0.82
Eigen	Benign	-0.99
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.047	N
M_CAP	Benign	0.019	T
MetaRNN	Benign	0.16	T;T
MetaSVM	Benign	-0.92	T
PhyloP100		-0.91
PrimateAI	Benign	0.25	T
PROVEAN	Uncertain	-4.3	D;D
REVEL	Benign	0.28
Sift	Benign	0.18	T;T
Sift4G	Benign	0.17	T;T
Vest4		0.40
MutPred		0.38		Gain of catalytic residue at L1208 (P = 0.0558);Gain of catalytic residue at L1208 (P = 0.0558);
MVP		0.77
MPC		0.022
ClinPred		0.078	T
GERP RS		-6.3
gMVP		0.18
Mutation Taster		=74/26	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs397507310; hg19: chr13-32912112; COSMIC: COSV104701355;