17-43063909-C-G

Position:

chr17-43063909-C-G

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 5P and 9B. PM1PM5PP3BP4BP6_Very_Strong

The NM_007294.4(BRCA1):c.5117G>C(p.Gly1706Ala) variant causes a missense change. The variant allele was found at a frequency of 0.0000465 in 1,614,060 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G1706E) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000044 ( 0 hom. )

Consequence

BRCA1
NM_007294.4 missense

Scores

Clinical Significance

Benign reviewed by expert panel U:1B:22O:1

Conservation

PhyloP100: 4.86

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 -4 ACMG points.

PM1

In a hotspot region, there are 11 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 3 benign, 17 uncertain in NM_007294.4

PM5

Other missense variant is known to change same aminoacid residue: Variant chr17-43063909-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 37638.Status of the report is reviewed_by_expert_panel, 3 stars.

PP3

Multiple lines of computational evidence support a deleterious effect 6: BayesDel_addAF, BayesDel_noAF, Eigen, FATHMM_MKL, M_CAP, PROVEAN [when max_spliceai, MetaRNN, MutationAssessor, MutationTaster was below the threshold]

BP4

Computational evidence support a benign effect (MetaRNN=0.36246336).

BP6

Variant 17-43063909-C-G is Benign according to our data. Variant chr17-43063909-C-G is described in ClinVar as [Benign]. Clinvar id is 55406.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr17-43063909-C-G is described in Lovd as [Benign]. Variant chr17-43063909-C-G is described in Lovd as [Likely_benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA1	NM_007294.4 linkuse as main transcript	c.5117G>C	p.Gly1706Ala	missense_variant	17/23	ENST00000357654.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA1	ENST00000357654.9 linkuse as main transcript	c.5117G>C	p.Gly1706Ala	missense_variant	17/23	1	NM_007294.4	P4	P38398-1

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152136

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000189

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000477

AC:

AN:

251342

Hom.:

AF XY:

0.0000515

AC XY:

AN XY:

135856

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.0000528

Gnomad OTH exome

AF:

0.000653

GnomAD4 exome

AF:

0.0000445

AC:

AN:

1461806

Hom.:

Cov.:

AF XY:

0.0000385

AC XY:

AN XY:

727204

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.000112

Gnomad4 NFE exome

AF:

0.0000387

Gnomad4 OTH exome

AF:

0.000166

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152254

Hom.:

Cov.:

AF XY:

0.000107

AC XY:

AN XY:

74446

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000189

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.0000752

Hom.:

Bravo

AF:

0.0000945

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000412

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Benign

Submissions summary: Uncertain:1Benign:22Other:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 1

Uncertain:1Benign:8Other:1

Benign, no assertion criteria provided	clinical testing	Pathway Genomics	Nov 06, 2014	- -
Uncertain significance, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA1)	May 29, 2002	- -
Benign, reviewed by expert panel	curation	Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)	Aug 10, 2015	IARC class based on posterior probability from multifactorial likelihood analysis, thresholds for class as per Plon et al. 2008 (PMID: 18951446). Class 1 based on posterior probability = 0.0000495 -
Likely benign, criteria provided, single submitter	literature only	Counsyl	Mar 23, 2014	- -
Likely benign, no assertion criteria provided	clinical testing	Department of Medical Genetics, University Hospital of North Norway	May 01, 2016	- -
Likely benign, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	Aug 16, 2012	- -
Likely benign, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -
Benign, criteria provided, single submitter	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	May 31, 2017	- -
not provided, no classification provided	in vitro	Brotman Baty Institute, University of Washington	-	- -
Likely benign, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Feb 05, 2024	- -

not specified

Benign:5

Benign, no assertion criteria provided	clinical testing	Clinical Genetics Laboratory, Department of Pathology, Netherlands Cancer Institute	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Oct 13, 2015	- -
Benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Benign, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -
Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -

not provided

Benign:3

Benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Oct 31, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Oct 05, 2020	This variant is associated with the following publications: (PMID: 17305420, 15689452, 20378548, 24916970, 21990134, 15923272, 30209399, 23683081, 12955716, 12601471, 23469205, 21702907, 21447777, 23479189, 23289006, 25782689, 15235020, 23867111, 25814778, 27495310, 26997744, 18645608, 20516115, 30145549, 30263132, 28781887, 30765603, 33087888) -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Mar 30, 2016	Variant Summary: The BRCA1 c.5117G>C variant involves the alteration of a conserved nucleotide, resulting in an amino acid change from a Gly to an Ala at codon 1706. G1706 is a highly conserved residue located at the interface between the two BRCT domains, which forms the binding pocket for the peptide and functional studies have shown G1706A may be mildly destablizing (Lee_CR_2010); however, this finding was in contrast to Lovelock et al 2006, showing no change in stability. Regardless, the implications of this possible reduction in protein stability in cancer are not known. 4/5 in-silico tools predict a pathogenic outcome. Contrary to in silico and the conflicting stability assay results, multiple other functional assays from independent labs show the variant to have similar activity compared to WT, including, subcellular localization, transcriptional transactivation, centrosome amplification, binding activity, as well as splicing/transcription analysis via patient mRNA (Lovelock_2006, Campos_2003, Lee_CR_2010).The variant was observed in the large and broad cohorts of the ExAC project at an allele frequency of 0.004% which does not exceed the maximal expected allele frequency for a pathogenic variant in BRCA1 (0.10%). The variant has been reported in the literature in affected individuals, without strong evidence for causality (i.e. co-segregation with disease). The variant has been reported in databases and publications to co-occur in patients with pathogenic variants including 3 patients who also carry BRCA1 c.3049G>T (p.Glu1017X; UMD), 1 patient with BRCA2 c.IVS2+2T>C (c.67+2T>C; UMD), 1 patient with BRCA2 c.51_52delAC (p.Arg18LeufsX12; UMD) and 1 patient with BRCA1 c.5263insC (p.Gln1756fs; Carraro_2013). Additionally, the variant was reported to not segregate with disease in multiple pedigrees, including one family with one affected individual without the variant as well as a second family with two unaffected variant carriers (ages 70 and 90; Lovelock_2006). In another family, the affected proband was positive for the variant, but the variant was not inherited from the cancer affected maternal side of the family (fathers side had no cancer history; Lovelock_2006). Furthermore, multiple reputable clinical labs have classified the variant as likely benign/benign. Therefore, due to the lack of co-segregation of the variant with disease, the co-occurrence of the variant with pathogenic variants in multiple patients, and functional assays showing similar activity to WT BRCA1, this variant has been classified as a benign variant. -

Hereditary cancer-predisposing syndrome

Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jun 20, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 18, 2014	This alteration is classified as 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. -
Likely benign, criteria provided, single submitter	curation	Sema4, Sema4	Jan 18, 2021	- -

Hereditary breast ovarian cancer syndrome

Benign:2

Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 25, 2024	- -
Likely benign, criteria provided, single submitter	research	Genetics Program, Instituto Nacional de Cancer	Nov 01, 2021	- -

Malignant tumor of breast

Benign:1

Likely benign, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

The BRCA1 p.Gly1706Ala variant has been reported in the literature in 11/1788 proband chromosomes from individuals with hereditary breast and ovarian cancer (Abkevich 2004, Bonatti 2006, Campos 2003, Filippini 2007, Hondow 2011, Lee 2010, Lovelock 2006, Mirkovic 2004, Phelan 2005, Williams 2003) and was not identified in 1100 control chromosomes from healthy individuals (Campos 2003, Phelan 2005). The variant was also identified in dbSNP (ID: rs80356860) with a minor allele frequency of 0.0002 (1000 Genomes Project), LOVD, the ClinVar database (classified as a Likely Benign variant by the Sharing Clinical Reports Project, derived from Myriad reports), the BIC database (6X with unknown clinical importance), and UMD (28X as a UV variant). The variant was also identified by the Exome Variant Server project in 1 of 8600 European American alleles (frequency: 0.0001), although this low number of observations and low frequency is not substantive enough to determine the prevalence of the variant in the general population and its relationship to disease.In the UMD database, this variant has been identified in three individuals with a second pathogenic BRCA1 and BRCA2 variants (c.3049G>T (p.Glu1017X) ; c.IVS2+2T>C (c.67+2T>C), thereby increasing the likelihood that this variant does not have clinical significance. The p.Gly1706 residue is conserved across mammals and lower organisms, and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) suggest that the p.Gly1706 variant may impact the protein. However, this information is not predictive enough to assume pathogenicity. In addition, several functional assays that examined the variant's protein stability, transcriptional transactivation, and subcellular localization predict this variant to be nonpathogenic (Lee 2010, Lovelock 2006, Williams 2003). In summary, the clinical significance of this variant cannot be determined with certainty at this time, although we would lean towards a more benign role for this variant. This variant is classified as Predicted Benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.49

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Pathogenic

0.23

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.14

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

Eigen

Pathogenic

0.70

Eigen_PC

Pathogenic

0.73

FATHMM_MKL

Uncertain

0.95

LIST_S2

Pathogenic

0.98

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

M_CAP

Pathogenic

0.38

MetaRNN

Benign

0.36

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

MetaSVM

Uncertain

-0.084

MutationAssessor

Benign

1.9

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

MutationTaster

Benign

1.0

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

PrimateAI

Uncertain

0.79

PROVEAN

Pathogenic

-4.5

D;N;.;D;.;.;N;D;D;N;D

REVEL

Uncertain

0.52

Sift

Benign

0.081

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

Sift4G

Pathogenic

0.0

D;D;D;D;D;D;D;D;.;.;D

Polyphen

0.86, 1.0

.;P;.;.;.;D;.;.;.;D;.

Vest4

0.78

MVP

0.85

MPC

0.40

ClinPred

0.17

GERP RS

5.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.77

gMVP

0.86

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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