rs80357190

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1PM2BP4_Moderate

The NM_007294.4(BRCA1):c.305C>T(p.Ala102Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,457,078 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A102G) has been classified as Benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

BRCA1
NM_007294.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 1.52

Variant links:

Genes affected

BRCA1 (HGNC:1100): (BRCA1 DNA repair associated) This gene encodes a 190 kD nuclear phosphoprotein that plays a role in maintaining genomic stability, and it also acts as a tumor suppressor. The BRCA1 gene contains 22 exons spanning about 110 kb of DNA. The encoded protein combines with other tumor suppressors, DNA damage sensors, and signal transducers to form a large multi-subunit protein complex known as the BRCA1-associated genome surveillance complex (BASC). This gene product associates with RNA polymerase II, and through the C-terminal domain, also interacts with histone deacetylase complexes. This protein thus plays a role in transcription, DNA repair of double-stranded breaks, and recombination. Mutations in this gene are responsible for approximately 40% of inherited breast cancers and more than 80% of inherited breast and ovarian cancers. Alternative splicing plays a role in modulating the subcellular localization and physiological function of this gene. Many alternatively spliced transcript variants, some of which are disease-associated mutations, have been described for this gene, but the full-length natures of only some of these variants has been described. A related pseudogene, which is also located on chromosome 17, has been identified. [provided by RefSeq, May 2020]

BRCA1 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 5 benign, 16 uncertain in NM_007294.4

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.23562846).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA1	NM_007294.4 linkuse as main transcript	c.305C>T	p.Ala102Val	missense_variant	6/23	ENST00000357654.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA1	ENST00000357654.9 linkuse as main transcript	c.305C>T	p.Ala102Val	missense_variant	6/23	1	NM_007294.4	P4	P38398-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.86e-7

AC:

AN:

1457078

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

725154

show subpopulations

Gnomad4 AFR exome

AF:

0.0000300

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 26, 2021

The p.A102V variant (also known as c.305C>T), located in coding exon 5 of the BRCA1 gene, results from a C to T substitution at nucleotide position 305. The alanine at codon 102 is replaced by valine, an amino acid with similar properties. This alteration has been identified in a cohort of Nigerian breast cancer patients (Fackenthal JD et al. Int J Cancer, 2012 Sep;131:1114-23). This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Hereditary breast ovarian cancer syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

May 01, 2023

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 102 of the BRCA1 protein (p.Ala102Val). 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. 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 BRCA1 protein function. ClinVar contains an entry for this variant (Variation ID: 1799342). This missense change has been observed in individual(s) with breast cancer (PMID: 22034289). This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Uncertain

0.11

CADD

Benign

DANN

Benign

0.92

DEOGEN2

Benign

0.13

.;T;.;.;.;.;.;T;.;T;.;T;T;.;T;T;.;.

Eigen

Benign

0.022

Eigen_PC

Benign

0.079

FATHMM_MKL

Benign

0.63

LIST_S2

Uncertain

0.88

D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D

M_CAP

Benign

0.069

MetaRNN

Benign

0.24

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.5

L;L;L;L;.;L;.;.;.;.;.;.;.;.;.;.;.;.

MutationTaster

Benign

1.0

D;D;D;D;N;N;N;N;N;N;N;N;N;N

PrimateAI

Benign

0.32

PROVEAN

Benign

-1.2

N;N;N;N;N;N;N;N;N;N;N;.;N;N;N;N;N;.

REVEL

Uncertain

0.62

Sift

Benign

0.33

T;D;D;T;D;T;T;T;T;D;D;.;D;D;D;T;T;.

Sift4G

Benign

0.43

T;T;T;T;T;T;.;.;T;.;T;.;D;.;D;.;.;.

Polyphen

0.66, 0.0050, 0.42

.;P;.;.;.;B;.;.;.;.;B;.;.;.;.;.;.;.

Vest4

0.31

MutPred

0.49

Loss of disorder (P = 0.0985);Loss of disorder (P = 0.0985);Loss of disorder (P = 0.0985);Loss of disorder (P = 0.0985);.;Loss of disorder (P = 0.0985);.;Loss of disorder (P = 0.0985);.;.;Loss of disorder (P = 0.0985);Loss of disorder (P = 0.0985);Loss of disorder (P = 0.0985);.;Loss of disorder (P = 0.0985);Loss of disorder (P = 0.0985);.;.;

MVP

0.94

MPC

0.090

ClinPred

0.26

GERP RS

3.2

Varity_R

0.077

gMVP

0.28

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

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