17-43093970-C-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 0P and 3B. BP4_ModerateBP6

The NM_007294.4(BRCA1):c.1561G>A(p.Ala521Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000316 in 1,613,534 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000022 ( 0 hom. )

Consequence

BRCA1
NM_007294.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:7O:1

Conservation

PhyloP100: 0.817

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.07807246).

BP6

Variant 17-43093970-C-T is Benign according to our data. Variant chr17-43093970-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 54291.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=7, Uncertain_significance=4, not_provided=1}. Variant chr17-43093970-C-T is described in Lovd as [Benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRCA1	NM_007294.4 link	c.1561G>A	p.Ala521Thr	missense_variant	Exon 10 of 23	ENST00000357654.9	NP_009225.1	P38398-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRCA1	ENST00000357654.9 link	c.1561G>A	p.Ala521Thr	missense_variant	Exon 10 of 23	1	NM_007294.4	ENSP00000350283.3		P38398-1

Frequencies

GnomAD3 genomes

AF:

0.000125

AC:

AN:

152148

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000459

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000440

AC:

AN:

250278

Hom.:

AF XY:

0.0000370

AC XY:

AN XY:

135252

show subpopulations

Gnomad AFR exome

AF:

0.000678

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000219

AC:

AN:

1461386

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

726924

show subpopulations

Gnomad4 AFR exome

AF:

0.000926

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:

0.0000166

GnomAD4 genome

AF:

0.000125

AC:

AN:

152148

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

74328

show subpopulations

Gnomad4 AFR

AF:

0.000459

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000230

Hom.:

Bravo

AF:

0.000174

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000494

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:7Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:2Benign:1Other:1

Sep 19, 2013

ITMI

Significance: not provided

Review Status: no classification provided

Collection Method: reference population

- -

Aug 24, 2016

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 08, 2019

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 16, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: BRCA1 c.1561G>A (p.Ala521Thr) results in a non-conservative amino acid change in the encoded protein sequence, altering a non-conserved amino acid (HGMD). Four of five in-silico tools predict a benign effect of the variant on protein function, a finding consistent with other in-silico studies reporting a neutral outcome (example, Martelotto_2014, Pavlicek_2004). The variant allele was found at a frequency of 4.8e-05 in 250464 control chromosomes, predominantly at a frequency of 0.00068 within the African or African-American subpopulation in the gnomAD database. This frequency is not higher than expected for a pathogenic variant in BRCA1 causing Hereditary Breast And Ovarian Cancer Syndrome (4.8e-05 vs 0.001), allowing no conclusion about variant significance. The variant was also found in several women of African ancestry over the age of 70 years who have never had cancer (FLOSSIES database), suggesting a benign role. c.1561G>A has been reported in the literature in individuals affected with Breast and/or Ovarian Cancer (Olopade_2003, Russo_2007, George_2021). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Breast And Ovarian Cancer Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Eight (other) submitters have provided clinical-significance assessments for this variant to ClinVar after 2014, and classified the variant as uncertain significance (n=4) and likely benign (n=4). Based on the absence of concrete evidence supporting an actionable outcome spanning over 7 years of testing and literature review as outlined above, the variant was classified as likely benign. -

Breast-ovarian cancer, familial, susceptibility to, 1

Uncertain:3

Feb 19, 2016

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

May 29, 2002

Breast Cancer Information Core (BIC) (BRCA1)

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Feb 19, 2019

Division of Medical Genetics, University of Washington

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has been reported in individuals with breast cancer and ovarian cancer (Olopade 2003, Russo 2007), as well as healthy individuals of African ancestry (Bodian 2014). The c.1561G>A variant has an overall allele frequency of 0.00005 in the Genome Aggregation Database (gnomad.broadinstitute.org). Thus, it is unknown at this time whether this variant increases cancer risk. -

Hereditary cancer-predisposing syndrome

Benign:3

Nov 17, 2015

Color Diagnostics, LLC DBA Color Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 29, 2018

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). -

not provided

Uncertain:1Benign:1

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 04, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Observed in individuals with personal and/or family history of breast and/or ovarian cancer (Olopade 2003, Russo 2007); This variant is associated with the following publications: (PMID: 24728327, 12491487, 17221156, 25348012, 15385441, 28873162, 10923033) -

BRCA1-related cancer predisposition

Benign:1

Aug 06, 2024

All of Us Research Program, National Institutes of Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary breast ovarian cancer syndrome

Benign:1

Jan 22, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.091

BayesDel_addAF

Benign

-0.10

BayesDel_noAF

Uncertain

-0.020

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.19

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

Eigen

Benign

-0.64

Eigen_PC

Benign

-0.56

FATHMM_MKL

Benign

0.057

LIST_S2

Uncertain

0.89

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

M_CAP

Uncertain

0.19

MetaRNN

Benign

0.078

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

MetaSVM

Benign

-0.83

MutationAssessor

Benign

0.89

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

PrimateAI

Benign

0.22

PROVEAN

Benign

-1.3

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

REVEL

Uncertain

0.53

Sift

Benign

0.17

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

Sift4G

Benign

0.73

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

Polyphen

0.36

B;.;.;B;.;.;.

Vest4

0.25

MVP

0.55

MPC

0.086

ClinPred

0.012

GERP RS

1.6

Varity_R

0.074

gMVP

0.053

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over