17-43094276-C-G

Variant names:

• chr17-43094276-C-G
• rs876658873
• NM_007294.4:c.1255G>C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_007294.4(BRCA1):​c.1255G>C​(p.Val419Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,828 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 Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. V419V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: BRCA1 NM_007294.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7 B:1
• Conservation: PhyloP100: 0.565

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.19924241).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRCA1	NM_007294.4	c.1255G>C	p.Val419Leu	missense_variant	Exon 10 of 23	ENST00000357654.9	NP_009225.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRCA1	ENST00000357654.9	c.1255G>C	p.Val419Leu	missense_variant	Exon 10 of 23	1	NM_007294.4	ENSP00000350283.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461828 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 727218

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

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 Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:2 Benign:1

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). -

Oct 31, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.V419L variant (also known as c.1255G>C), located in coding exon 9 of the BRCA1 gene, results from a G to C substitution at nucleotide position 1255. The valine at codon 419 is replaced by leucine, an amino acid with highly similar properties. This alteration was identified in an individual with a personal and family history of breast cancer (Carney ME et al. Hawaii Med J 2010 Nov; 69(11):268-71). 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. -

Apr 01, 2025

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces valine with leucine at codon 419 of the BRCA1 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function. To our knowledge, functional studies have not been reported for this variant. This variant has been detected in a breast cancer case-control meta-analysis in 0/60466 cases and 2/53461 unaffected individuals (PMID: 33471991; Leiden Open Variation Database DB-ID BRCA1_006522), and it has also been reported in an individual affected with breast or ovarian cancer (PMID: 28364669). A multifactorial analysis has reported a likelihood ratio for pathogenicity based on personal and family history of 0.23 from log(LR)=-0.6378 for two carriers (PMID: 31853058). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

not provided Uncertain:2

Jun 10, 2016

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The BRCA1 c.1255G>C (p.Val419Leu) variant involves the alteration of a non-conserved nucleotide. 3/5 in silico tools predict a benign outcome; functional studies had not been published at the time of variant classification. This variant was absent in 121208 control chromosomes, but was reported in one breast cancer patient diagnosed at 72 years old without evidence of causality (i.e. co-segregation data). Additionally, one clinical lab classified the variant as a VUS. Taken together, the variant was classified as a variant of uncertain significance (VUS) until additional information becomes available. -

May 21, 2021

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Breast-ovarian cancer, familial, susceptibility to, 1 Uncertain:1

Dec 18, 2023

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces valine with leucine at codon 419 of the BRCA1 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function. To our knowledge, functional studies have not been reported for this variant. This variant has been detected in a breast cancer case-control meta-analysis in 0/60466 cases and 2/53461 unaffected individuals (PMID: 33471991; Leiden Open Variation Database DB-ID BRCA1_006522), and it has also been reported in an individual affected with breast or ovarian cancer (PMID: 28364669). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Malignant tumor of breast Uncertain:1

-

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The p.Leu419Val variant has been reported in the literature in 1 of 546 proband chromosomes in an individual with breast cancer with late onset (Carney_2010). However, population controls were not included in this study, and so the prevalence of this variant in the general population is not known. The p.Leu419 residue is not well conserved in mammals and computational analyses (SIFT, Polyphen, AlignGVGD) provide inconsistent predictions regarding the impact to the protein. But this information is not very predictive of pathogenicity. In summary, based on the above information, the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of unknown significance. -

Hereditary breast ovarian cancer syndrome Uncertain:1

Oct 13, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 419 of the BRCA1 protein (p.Val419Leu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with breast cancer (PMID: 21218378). ClinVar contains an entry for this variant (Variation ID: 230967). 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. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.040
CADD	Benign	11
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.44	T;.;.;.;T;T;.;.;T
Eigen	Benign	-0.44
Eigen_PC	Benign	-0.63
FATHMM_MKL	Benign	0.095	N
LIST_S2	Benign	0.83	T;T;T;T;T;T;T;T;T
M_CAP	Uncertain	0.17	D
MetaRNN	Benign	0.20	T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	-0.16	T
MutationAssessor	Uncertain	2.6	M;M;.;.;.;.;.;.;.
PrimateAI	Benign	0.27	T
PROVEAN	Uncertain	-2.5	N;D;N;D;.;D;D;D;N
REVEL	Uncertain	0.56
Sift	Benign	0.053	T;T;T;T;.;D;D;D;D
Sift4G	Benign	0.080	T;T;T;T;.;T;.;T;D
Polyphen		0.96	D;.;.;B;.;.;.;.;.
Vest4		0.28
MutPred		0.29		Loss of sheet (P = 3e-04);Loss of sheet (P = 3e-04);.;Loss of sheet (P = 3e-04);.;Loss of sheet (P = 3e-04);.;.;Loss of sheet (P = 3e-04);
MVP		0.86
MPC		0.19
ClinPred		0.15	T
GERP RS		0.29
Varity_R		0.10
gMVP		0.083

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: rs876658873; hg19: chr17-41246293; COSMIC: COSV105177581; COSMIC: COSV105177581;