17-43092131-C-A

Position:

• chr17-43092131-C-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1 PP5_Very_Strong

The NM_007294.4(BRCA1):​c.3400G>T​(p.Glu1134*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000753 in 1,461,398 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000075 (0 hom.)
• Consequence: BRCA1 NM_007294.4 stop_gained
• Clinical Significance: Pathogenic reviewed by expert panel P:19
• Conservation: PhyloP100: 3.37

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 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 17-43092131-C-A is Pathogenic according to our data. Variant chr17-43092131-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 37529.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr17-43092131-C-A is described in Lovd as [Pathogenic]. Variant chr17-43092131-C-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRCA1	NM_007294.4	c.3400G>T	p.Glu1134*	stop_gained	10/23	ENST00000357654.9	NP_009225.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRCA1	ENST00000357654.9	c.3400G>T	p.Glu1134*	stop_gained	10/23	1	NM_007294.4	ENSP00000350283.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000399 AC: 1 AN: 250824 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135694

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: 0.00000881

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000753 AC: 11 AN: 1461398 Hom.: 0 Cov.: 38 AF XY: 0.00000825 AC XY: 6 AN XY: 727004

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: 0.00000989

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.000106 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:19

Revision: reviewed by expert panel

Submissions by phenotype

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

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Jan 14, 2024	- -
Pathogenic, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	Dec 07, 2011	- -
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, criteria provided, single submitter	clinical testing	Department of Medical Genetics, Oslo University Hospital	Jul 09, 2015	- -
Pathogenic, criteria provided, single submitter	clinical testing	Department of Clinical Genetics, Copenhagen University Hospital, Rigshospitalet	May 27, 2024	PVS1; PM5_PTC_Strong -
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	- -

Hereditary breast ovarian cancer syndrome Pathogenic:6

Pathogenic, criteria provided, single submitter	clinical testing	National Health Laboratory Service, Universitas Academic Hospital and University of the Free State	Nov 16, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jan 17, 2018	The p.Glu1134X variant in BRCA1 has been reported in >20 individuals with BRCA1- associated cancers (Wagner 1999, Bergthorsson 2001, Nedelcu 2002, Pal 2005, Couc h 2015, Rebbeck 2016, Breast Cancer Information Core (BIC) database: https://res earch.nhgri.nih.gov/bic/) and was absent from large population studies. This non sense variant leads to a premature termination codon at position 1134, which is predicted to lead to a truncated or absent protein. Heterozygous loss of functio n of the BRCA1 gene is an established disease mechanism in individuals with here ditary breast and ovarian cancer (HBOC). In addition, this variant was classifie d as Pathogenic on April 22, 2016 by the ClinGen-approved ENIGMA expert panel (C linVar SCV000282306.1). In summary, this variant meets criteria to be classified as pathogenic for HBOC in an autosomal dominant manner based upon presence in m ultiple affected individuals, absence in the general population and predicted im pact to the protein. ACMG/AMP Criteria applied: PVS1; PS4; PM2 (Richards 2015). -
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	Apr 11, 2022	Variant summary: BRCA1 c.3400G>T (p.Glu1134X) 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 250824 control chromosomes. c.3400G>T has been reported in the literature in multiple individuals affected with Hereditary Breast And Ovarian Cancer Syndrome (example, Nedelcu_2002, Thomassen_2008, Pal_2005). These data indicate that the variant is very likely to be associated with disease. Multiple clinical diagnostic laboratories, an expert panel (ENIGMA) and a consortium (CIMBA) have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All submitters classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	research	Genetics Program, Instituto Nacional de Cancer	Nov 01, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 23, 2023	This sequence change creates a premature translational stop signal (p.Glu1134*) 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 not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with breast cancer and ovarian cancer (PMID: 10644434, 11389159, 16284991, 25452441, 26833046, 27376475, 27836010). This variant is also known as 3519G>T. ClinVar contains an entry for this variant (Variation ID: 37529). For these reasons, this variant has been classified as Pathogenic. -

not provided Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Sep 21, 2021	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 a personal or family history consistent with pathogenic variants in this gene (Bergthorsson 2001, Nedelcu 2002, Pal 2005, Couch 2015, Wei 2018); Not observed at a significant frequency in large population cohorts (Lek 2016); Truncating variants in this gene are considered pathogenic by a well-established clinical consortium and/or database; Also known as 3519G>T; This variant is associated with the following publications: (PMID: 10644434, 29446198, 29752822, 31825140, 32380732, 31897316, 25452441, 23704984, 21702907, 16234499, 11748305, 11938448, 21233401, 16284991, 21913181, 19329713, 27221827, 11389159, 27836010, 27376475, 25525159, 29339979, 29805665, 31447099) -
Pathogenic, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Sep 08, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Apr 30, 2021	This nonsense variant causes the premature termination of BRCA1 protein synthesis. In the published literature, this variant has been reported in affected individuals with breast and/or ovarian cancer (PMIDs: 17688236 (2007), 21233401 (2011), 25452441 (2015), 27376475 (2016), 27836010 (2016), 29339979 (2018), and 29752822 (2018)). Based on the available information, this variant is classified as pathogenic. -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Feb 23, 2022	The p.E1134* pathogenic mutation (also known as c.3400G>T), located in coding exon 9 of the BRCA1 gene, results from a G to T substitution at nucleotide position 3400. This changes the amino acid from a glutamic acid to a stop codon within coding exon 9. This alteration has been reported in multiple individuals/families with hereditary breast and/or ovarian cancer (HBOC) (Wagner T et al. Genomics. 1999 Dec;62:369-76; Thomassen M et al. Acta Oncol. 2008;47:772-7; Rebbeck TR et al. Breast Cancer Res. 2016 11;18(1):112; Heramb C et al. Hered Cancer Clin Pract. 2018 Jan;16:3; Wei H et al. Oncol Lett, 2018 Jun;15:9420-9428; Incorvaia L et al. Cancers (Basel), 2020 May;12:). Of note, this alteration is also designated as 3519G>T 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	Mar 02, 2021	This variant changes 1 nucleotide in exon 10 of the BRCA1 gene, creating a 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 observed in at least 10 individuals and families affected with breast and ovarian cancer (PMID: 11389159, 11938448, 16284991, 18465347, 25452441, 27376475, 29339979, 29752822). This variant has been identified in 1/250824 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.30
CADD	Pathogenic	35
DANN	Uncertain	0.98
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.26
FATHMM_MKL	Uncertain	0.82	D
Vest4		0.84
GERP RS		4.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs80357018; hg19: chr17-41244148;