chr13-32379816-G-A

Position:

• chr13-32379816-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2 PM5 BP4

The NM_000059.4(BRCA2):​c.9020G>A​(p.Arg3007Lys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 11/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R3007G) has been classified as Benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: BRCA2 NM_000059.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.20

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr13-32379814-CAG-CTCTA is described in Lovd as [Pathogenic].
• BP4: Computational evidence support a benign effect (MetaRNN=0.35754982).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4	c.9020G>A	p.Arg3007Lys	missense_variant	23/27	ENST00000380152.8	NP_000050.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA2	ENST00000380152.8	c.9020G>A	p.Arg3007Lys	missense_variant	23/27	5	NM_000059.4	ENSP00000369497.3
BRCA2	ENST00000530893.7	c.8651G>A	p.Arg2884Lys	missense_variant	23/27	1		ENSP00000499438.2
BRCA2	ENST00000614259.2	n.*1078G>A		non_coding_transcript_exon_variant	22/26	2		ENSP00000506251.1
BRCA2	ENST00000614259.2	n.*1078G>A		3_prime_UTR_variant	22/26	2		ENSP00000506251.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Breast neoplasm Uncertain:1

Uncertain significance, criteria provided, single submitter

research

Laboratory of Molecular Diagnosis of Cancer, West China Hospital, Sichuan University

Nov 01, 2015

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Uncertain	0.032	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	23
DANN	Uncertain	1.0
Eigen	Uncertain	0.43
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Uncertain	0.94	D
M_CAP	Benign	0.042	D
MetaRNN	Benign	0.36	T;T
MetaSVM	Uncertain	-0.24	T
PrimateAI	Benign	0.43	T
PROVEAN	Benign	-0.79	N;N
REVEL	Benign	0.25
Sift	Benign	0.14	T;T
Sift4G	Benign	0.26	T;T
Vest4		0.38
MutPred		0.36		Gain of methylation at K3004 (P = 0.0787);Gain of methylation at K3004 (P = 0.0787);
MVP		0.91
MPC		0.049
ClinPred		0.87	D
GERP RS		4.8
gMVP		0.53

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

Publications

LitVar

Other links and lift over

dbSNP: rs886037820; hg19: chr13-32953953;