rs80357997

Positions:

• chr17-43063888-AC-A
• chr17-43063888-AC-ACC

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_007294.4(BRCA1):​c.5137delG​(p.Val1713fs) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,224 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: BRCA1 NM_007294.4 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:19 U:1
• Conservation: PhyloP100: 0.856

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-43063888-AC-A is Pathogenic according to our data. Variant chr17-43063888-AC-A is described in ClinVar as [Pathogenic]. Clinvar id is 55411.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr17-43063888-AC-A is described in Lovd as [Pathogenic]. Variant chr17-43063888-AC-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA1	NM_007294.4	c.5137delG	p.Val1713fs	frameshift_variant	17/23	ENST00000357654.9	NP_009225.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA1	ENST00000357654.9	c.5137delG	p.Val1713fs	frameshift_variant	17/23	1	NM_007294.4	ENSP00000350283.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251322 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135842

Gnomad AFR exome AF: 0.00

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: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461224 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726980

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.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:19 Uncertain:1

Revision: reviewed by expert panel

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 1 Pathogenic:9

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Aug 10, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA), c/o University of Cambridge	Oct 02, 2015	- -
Pathogenic, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA1)	May 29, 2002	- -
Pathogenic, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Pathogenic, reviewed by expert panel	curation	Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)	Sep 08, 2016	Variant allele predicted to encode a truncated non-functional protein. -
Pathogenic, criteria provided, single submitter	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	Sep 21, 2015	- -
Pathogenic, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Dec 15, 2014	- -
Pathogenic, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	May 01, 2012	- -
Pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Sep 29, 2015	- -

Hereditary breast ovarian cancer syndrome Pathogenic:4

Pathogenic, no assertion criteria provided	research	Research Molecular Genetics Laboratory, Women's College Hospital, University of Toronto	Jan 31, 2014	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Dec 15, 2020	Variant summary: BRCA1 c.5137delG (p.Val1713X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant allele was found at a frequency of 4e-06 in 251322 control chromosomes (gnomAD). c.5137delG has been reported in the literature in multiple individuals affected with Hereditary Breast And Ovarian Cancer Syndrome (e.g. Struewing_1995, Vaziri_2001, Verhoog_2001, Judkins_2005, Couch_2015, Kluska_2015). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Ten other clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories cited the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 27, 2024	This sequence change creates a premature translational stop signal (p.Val1713*) in the BRCA1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in BRCA1 are known to be pathogenic (PMID: 20104584). This variant is present in population databases (rs80357997, gnomAD 0.0009%). This premature translational stop signal has been observed in individual(s) with breast cancer, ovarian cancer, and male breast cancer (PMID: 7611277, 16683254, 25948282, 26976419, 27767231). It has also been observed to segregate with disease in related individuals. This variant is also known as 5256delG. ClinVar contains an entry for this variant (Variation ID: 55411). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 01, 2017	The p.Val1713X variant in BRCA1 has been reported in >15 individuals with BRCA1- associated cancers and segregated with disease in >7 affected relatives (Struewi ng 1995, Monnerat 2007, Breast Cancer Information Core (BIC) database). It was a lso identified in 1/66198 European chromosomes by the Exome Aggregation Consorti um (ExAC, http://exac.broadinstitute.org; dbSNP rs80357997); however, this frequ ency is low enough to be consistent with the frequency of hereditary breast and ovarian cancer (HBOC) in the general population. This variant is a deletion of a single nucleotide, which generates a premature termination codon at position 17 13, which is predicted to lead to a truncated or absent protein. Heterozygous lo ss of function of the BRCA1 gene is an established disease mechanism in HBOC. Fu rthermore, this variant was classified as Pathogenic on September 8, 2016 by the ClinGen-approved ENIGMA expert panel (ClinVar SCV000300209.2). In summary, this variant meets criteria to be classified as pathogenic for HBOC in an autosomal dominant manner. -

Hereditary cancer-predisposing syndrome Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 20, 2024	The c.5137delG pathogenic mutation, located in coding exon 16 of the BRCA1 gene, results from a deletion of one nucleotide at position 5137. This changes the amino acid from a valine to a stop codon (p.V1713*). This mutation (designated as 5256delG) has been reported in multiple cohorts of breast and/or ovarian cancer families, including in a male affected with both breast and prostate cancer; in an ovarian cancer patient whose tumor showed loss-of-heterozygosity; in 3 Dutch families and a Polish family with a history of breast and ovarian cancer; and in a female with breast cancer diagnosed at 31 who also had a family history of breast cancer, among other cancers (Struewing J et al. Am J Hum Genet. 1995 Jul;57(1):1-7; Weren RD et al. Hum. Mutat., 2017 Feb;38:226-235; van der Hout AH et al. Hum. Mutat., 2006 Jul;27:654-66; Kluska A et al. BMC Med Genomics, 2015 May;8:19; Tung N et al. J. Clin. Oncol., 2016 May;34:1460-8). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -
Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Feb 16, 2023	This variant deletes 1 nucleotide in exon 17 of the BRCA1 gene, creating a frameshift and premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals and families affected with breast and ovarian cancer (PMID: 7611277, 11139249, 11802209, 16683254, 17624602, 23192404, 25452441, 25948282, 26976419, 27767231, 30093976) and this variant co-segregated with breast and ovarian cancer in one family (PMID: 7611277). This variant has been identified in 1/251322 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of BRCA1 function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Institute for Biomarker Research, Medical Diagnostic Laboratories, L.L.C.	Jul 12, 2017	- -

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Sep 06, 2023	Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Observed in individuals with BRCA1-related cancers (Struewing et al., 1995; Meindl et al., 2002; Monnerat et al., 2007; Lee et al., 2011; Kluska et al., 2015; Tung et al., 2016; Weren et al., 2016; Chan et al., 2018); Not observed at significant frequency in large population cohorts (gnomAD); Truncating variants in this gene are considered pathogenic by a well-established clinical consortium and/or database; Also known as 5135delG, 5254delG, and 5256delG; This variant is associated with the following publications: (PMID: 22010008, 27767231, 17624602, 16267036, 25948282, 26843898, 28152038, 26976419, 30093976, 11802209, 7611277, 29625052, 30875412, 30787465, 26689913, 28888541, 29922827, 11597388, 15026808) -
Pathogenic, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Mar 08, 2022	PP5, PM2, PVS1 -

BRCA1-related cancer predisposition Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Jul 29, 2024

This variant deletes 1 nucleotide in exon 17 of the BRCA1 gene, creating a frameshift and premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals and families affected with breast and ovarian cancer (PMID: 7611277, 11139249, 11802209, 16683254, 17624602, 23192404, 25452441, 25948282, 26976419, 27767231) and this variant co-segregated with breast and ovarian cancer in one family (PMID: 7611277). This variant has been identified in 1/251322 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of BRCA1 function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -

Malignant tumor of breast Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

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Computational scores

Source: dbNSFP v4.3

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: rs80357997; hg19: chr17-41215905;