chr17-43099807-TG-T

Position:

• chr17-43099807-TG-T

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.514del​(p.Gln172AsnfsTer62) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000186 in 1,613,276 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★★). Synonymous variant affecting the same amino acid position (i.e. Q172Q) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: BRCA1 NM_007294.4 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:16
• Conservation: PhyloP100: 1.24

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 17-43099807-TG-T is Pathogenic according to our data. Variant chr17-43099807-TG-T is described in ClinVar as [Pathogenic]. Clinvar id is 55421.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr17-43099807-TG-T is described in Lovd as [Pathogenic]. Variant chr17-43099807-TG-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA1	NM_007294.4	c.514del	p.Gln172AsnfsTer62	frameshift_variant	7/23	ENST00000357654.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA1	ENST00000357654.9	c.514del	p.Gln172AsnfsTer62	frameshift_variant	7/23	1	NM_007294.4	P4

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152214 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

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: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251472 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135908

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: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461062 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 726930

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: 0.0000166

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152214 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 74358

Gnomad4 AFR AF: 0.00

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: 0.0000147

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:16

Revision: reviewed by expert panel

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 1 Pathogenic:7

Pathogenic, criteria provided, single submitter	clinical testing	Genetics and Molecular Pathology, SA Pathology	Apr 26, 2021	The BRCA1 c.514delC variant is classified as Pathogenic (PVS1, PM2_Supporting, PP5) This BRCA1 c.514delC variant is located in exon Missing Exon and is predicted to cause a shift in the reading frame at codon 172. This variant is absent from population databases (PM2). The variant has been reported in dbSNP (rs80357872) and has been reported as Pathogenic by other diagnostic laboratories (ClinVar Variation ID: 55421). It has not been reported in HGMD. literature: Finch et al., 2016, PMID:26219728, Wong-Brown et al., 2015, PMID:25682074, Ghiorzo et al., 2012, PMID:21989927, Miolo et al., 2009, PMID:19818148, Tai et al., 2007, PMID:18042939, Russo et al., 2007, PMID:17221156, Nanda et al., 2005, PMID:16234499, van Orsouw et al., 1999, PMID:10528853, Azzollini et al., 2016, PMID:27062684, Nedelcu et al., 2002, PMID:11938448, Lu et al., 2015, PMID:26689913, Huang et al., 2018, PMID:29625052, Fanale et al., 2020, PMID:32854451 -
Pathogenic, no assertion criteria provided	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	-	The p.Gln172AsnfsX62 deletion variant has been previously reported in the literature in at least 2 of 178 proband chromosomes in individuals or families with pancreatic and breast cancer (Ghiorzo 2012, van Orsouw 1999). The variant was also reported in HGMD, the UMD (3x as causal) and in the BIC (23x as clinically important) databases. It is predicted to cause a frameshift, which alters the protein's amino acid sequence beginning at codon 172 and leads to a premature stop codon 62 codons downstream. This alteration is then predicted to result in a truncated or absent protein and loss of function. Loss of function variants of the BRCA1 gene are an established mechanism of hereditary breast and ovarian cancer. In summary, based on the above information, this variant is classified as pathogenic. -
Pathogenic, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA1)	Dec 30, 1999	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 29, 2024	- -
Pathogenic, reviewed by expert panel	curation	Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)	Apr 22, 2016	Variant allele predicted to encode a truncated non-functional protein. -
Pathogenic, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	Nov 23, 2009	- -
Pathogenic, criteria provided, single submitter	clinical testing	Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA), c/o University of Cambridge	Oct 02, 2015	- -

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jul 25, 2023	Frameshift 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 several Hereditary Breast and Ovarian Cancer families (van Orsouw et al., 1999; Tai et al., 2007; Ghiorzo et al., 2012; Finch et al., 2015; Incorvaia et al., 2020); Truncating variants in this gene are considered pathogenic by a well-established clinical consortium and/or database; Not observed at significant frequency in large population cohorts (gnomAD); Also known as 633delC; This variant is associated with the following publications: (PMID: 27157322, 26219728, 25682074, 17591842, 20682393, 32438681, 28888541, 10528853, 18042939, 17221156, 27376475, 27566247, 21989927, 30128899, 29922827, 29907814, 29337092, 29625052, 26689913, 32854451, 30787465, 36139606, 34178674, 33573335, 32380732) -
Pathogenic, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Jul 03, 2015	- -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	May 25, 2022	- -

Hereditary breast ovarian cancer syndrome Pathogenic:3

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	Invitae	Sep 21, 2023	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 55421). This variant is also known as 633delC. This premature translational stop signal has been observed in individual(s) with breast, ovarian and pancreatic cancer (PMID: 10528853, 17591842, 21989927, 25682074, 26219728). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Gln172Asnfs*62) 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). -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Apr 10, 2024	Variant summary: BRCA1 c.514delC (p.Gln172AsnfsX62) 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. The variant allele was found at a frequency of 4e-06 in 251472 control chromosomes. c.514delC has been reported in the literature in multiple individuals affected with Hereditary Breast And Ovarian Cancer Syndrome. 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. The following publications have been ascertained in the context of this evaluation (PMID: 27062684, 18042939, 25682074). ClinVar contains an entry for this variant (Variation ID: 55421). Based on the evidence outlined above, the variant was classified as pathogenic. -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Jun 15, 2021	The c.514delC pathogenic mutation, located in coding exon 6 of the BRCA1 gene, results from a deletion of one nucleotide at nucleotide position 514, causing a translational frameshift with a predicted alternate stop codon (p.Q172Nfs*62). This mutation has been reported in multiple individuals and families affected with hereditary breast and ovarian cancer (HBOC) syndrome (van Orsouw NJ et al. J Med Genet. 1999 Oct;36(10):747-53; Nedelcu R et al. Eur. J. Hum. Genet. 2002 Feb;10(2):150-2; Nanda R et al. JAMA 2005 Oct;294(15):1925-33; Russo A et al. Breast Cancer Res. Treat. 2007 Nov;105(3):267-76; Tai YC et al. J Natl Cancer Inst. 2007 Dec;99(23):1811-4; Miolo G et al. BMC Cancer 2009 Oct;9:360; Ghiorzo P et al. Fam Cancer. 2012 Mar;11(1):41-7; Incorvaia L et al. Cancers (Basel), 2020 May;12; Fanale D et al. Cancers (Basel), 2020 Aug;12). Of note, this alteration is also designated as 633delC in published literature. 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 28, 2023	This variant deletes 1 nucleotide in exon 7 of the BRCA1 gene, creating a frameshift and premature translation stop signal. It is also known as 633delC according to the BIC nomenclature. This variant is expected to result in an absent or non-functional protein product. This variant has been observed in individuals with breast and/or ovarian cancer (PMID: 10528853, 17221156, 17591842, 25682074, 26219728) and pancreatic cancer (PMID: 21989927). This variant has been identified in 1/251472 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. -

Breast and/or ovarian cancer Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Foulkes Cancer Genetics LDI, Lady Davis Institute for Medical Research

Dec 03, 2013

- -

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: rs80357872; hg19: chr17-41251824; COSMIC: COSV99066404; COSMIC: COSV99066404;