Variant 13-32379774-C-T details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000059.4(BRCA2):c.8978C>T(p.Ser2993Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,188 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

BRCA2
NM_000059.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.17

Variant links:

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 links:

BRCA2 (HGNC:):

BRCA2 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA2	NM_000059.4 linkuse as main transcript	c.8978C>T	p.Ser2993Leu	missense_variant	23/27	ENST00000380152.8	NP_000050.3	P51587

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
BRCA2	ENST00000380152.8 linkuse as main transcript	c.8978C>T	p.Ser2993Leu	missense_variant	23/27	5	NM_000059.4	ENSP00000369497.3	P51587
BRCA2	ENST00000530893.7 linkuse as main transcript	c.8609C>T	p.Ser2870Leu	missense_variant	23/27	1		ENSP00000499438.2	A0A590UJI7
BRCA2	ENST00000614259.2 linkuse as main transcript	n.*1036C>T		non_coding_transcript_exon_variant	22/26	2		ENSP00000506251.1	A0A7P0TAP7
BRCA2	ENST00000614259.2 linkuse as main transcript	n.*1036C>T		3_prime_UTR_variant	22/26	2		ENSP00000506251.1	A0A7P0TAP7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460188

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726474

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.00e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 16, 2024

The p.S2993L variant (also known as c.8978C>T), located in coding exon 22 of the BRCA2 gene, results from a C to T substitution at nucleotide position 8978. The serine at codon 2993 is replaced by leucine, an amino acid with dissimilar properties. This amino acid position is not well conserved in available vertebrate species, and leucine is the reference amino acid in other vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.085

BayesDel_addAF

Uncertain

0.085

BayesDel_noAF

Benign

-0.12

CADD

Benign

DANN

Benign

0.66

Eigen

Benign

-0.12

Eigen_PC

Benign

0.034

FATHMM_MKL

Uncertain

0.80

M_CAP

Benign

0.017

MetaRNN

Benign

0.27

T;T

MetaSVM

Benign

-0.95

PrimateAI

Benign

0.34

PROVEAN

Benign

-1.1

N;N

REVEL

Benign

0.27

Sift

Benign

0.32

T;T

Sift4G

Benign

0.60

T;T

Vest4

0.50

MutPred

0.32

Loss of phosphorylation at S2993 (P = 0.0253);Loss of phosphorylation at S2993 (P = 0.0253);

MVP

0.84

MPC

0.16

ClinPred

0.56

GERP RS

3.5

gMVP

0.43

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.25

Details are displayed if max score is > 0.2

DS_AL_spliceai

0.25

Position offset: -24

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

Publications

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over