rs80356903

chr17-43091813-G-Achr17-43091813-G-C

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.3718C>T(p.Gln1240Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,864 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 (★★★). Synonymous variant affecting the same amino acid position (i.e. Q1240Q) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: BRCA1 NM_007294.4 stop_gained
• Clinical Significance: Pathogenic reviewed by expert panel P:19
• Conservation: PhyloP100: 2.84

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 17-43091813-G-A is Pathogenic according to our data. Variant chr17-43091813-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 54978.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr17-43091813-G-A is described in Lovd as [Pathogenic]. Variant chr17-43091813-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BRCA1	NM_007294.4	c.3718C>T	p.Gln1240Ter	stop_gained	10/23	ENST00000357654.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BRCA1	ENST00000357654.9	c.3718C>T	p.Gln1240Ter	stop_gained	10/23	1	NM_007294.4	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461864 Hom.: 0 Cov.: 33 AF XY: 0.00000275 AC XY: 2 AN XY: 727228

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:19

Revision: reviewed by expert panel

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 1 Pathogenic:11

Pathogenic, no assertion criteria provided	clinical testing	Sharing Clinical Reports Project (SCRP)	Jun 10, 2010	- -
Pathogenic, no assertion criteria provided	clinical testing	Breast Cancer Information Core (BIC) (BRCA1)	May 29, 2002	- -
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	research	HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology	Jan 22, 2019	- -
Pathogenic, no assertion criteria provided	clinical testing	BRCAlab, Lund University	Aug 26, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Dec 01, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Jul 19, 2023	This variant BRCA1 c.3718C>T (also known as BRCA1 3837C>T in the literature) creates a premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. Computational splicing tools suggest that this variant may not impact RNA splicing. This variant has been reported in individuals affected with endometrial, breast and ovarian cancer (PMID: 17645508, 22923021, 24333842, 25480878, 27393621). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). Loss of BRCA1 function is a known mechanism of disease. Based on available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	Jul 28, 2017	- -
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	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	Department of Molecular Diagnostics, Institute of Oncology Ljubljana	Apr 02, 2020	- -

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Nov 15, 2022	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 and family history of breast and/or ovarian cancer (Balleine et al., 2010; Novakovic et al., 2012; Wang et al., 2015); 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 3837C>T; This variant is associated with the following publications: (PMID: 25525159, 25480878, 24333842, 17645508, 22923021, 17761984, 27393621, 20815029, 23397983, 26833046, 18446624, 28740454, 28888541, 28724667, 29446198, 30702160, 31825140, 32918181) -
Pathogenic, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Aug 09, 2023	his variant causes the premature termination of BRCA1 protein synthesis. In the published literature, this variant has been reported in individuals with pancreatic cancer (PMID: 32918181 (2021)), ovarian cancer (PMID: 28740454 (2017)), and breast cancer (PMID: 31957001 (2020), 30702160 (2019), 28724667 (2017), 27393621 (2016), 25480878 (2015)). This variant has not been reported in large, multi-ethnic general populations (Genome Aggregation Database, http://gnomad.broadinstitute.org). Based on the available information, this variant is classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -

Hereditary breast ovarian cancer syndrome Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jul 29, 2015	The p.Gln1240X variant in BRCA1 has been reported in 2 individuals with endometr ial cancer (Kwon 2008, Conner 2014) and at least 7 individuals with breast and/o r ovarian cancer (Novakovic 2012, Wang 2015, Breast Cancer Information Core (BIC )). It was absent from large population studies. This nonsense variant leads to a premature termination codon at position 1240, which is predicted to lead to a truncated or absent protein. Heterozygous loss of BRCA1 function is an establish ed disease mechanism in hereditary breast and ovarian cancer (HBOC). In summary, this variant meets our criteria to be classified as pathogenic for HBOC in an a utosomal dominant manner (http://www.partners.org/personalizedmedicine/LMM) base d upon the predicted impact to the protein, presence in affected individuals, an d absence in controls. -
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	Jun 23, 2023	This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Gln1240*) 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 premature translational stop signal has been observed in individual(s) with breast, ovarian, and endometrial cancer (PMID: 17645508, 22923021, 24333842, 25480878, 27393621). For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 54978). This variant is also known as 3837C>T. -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Jul 12, 2022	The p.Q1240* pathogenic mutation (also known as c.3718C>T) located in coding exon 9 of the BRCA1 gene, results from a C to T substitution at nucleotide position 3718. This changes the amino acid from a glutamine to a stop codon within coding exon 9. This mutation has been reported in many individuals with personal and family histories of breast, ovarian, fallopian tube, and prostate cancer (Callahan MJ et al. J. Clin. Oncol. 2007 Sep;25:3985-90; Novakovi S et al. Int. J. Oncol. 2012 Nov;41:1619-27; Connor JR et al. Gynecol. Oncol. 2014 Feb;132:280-6; Wang C et al. Ann. Oncol. 2015 Mar;26:523-8; Zhang J et al. Breast Cancer Res. Treat. 2016 Aug;158:455-62; Cvelbar M et al. Radiol. Oncol. 2017 Jun;51(2):187-194). It has also been reported in a female patient diagnosed with advanced metastatic endometrial cancer who had a family history of melanoma, breast cancer, and prostate cancer (Kwon JS et al. Int. J. Gynecol. Cancer. 2008 May-Jun;18:546-9). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Of note, this alteration is also designated as 3837C>T and Q1240X 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	May 10, 2023	This variant BRCA1 c.3718C>T (also known as BRCA1 3837C>T in the literature) creates a premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. This variant has been reported in individuals affected with endometrial, breast and ovarian cancer (PMID: 17645508, 22923021, 24333842, 25480878, 27393621). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). Loss of BRCA1 function is a known mechanism of disease. Based on 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	0.29
Cadd	Pathogenic	35
Dann	Benign	0.97
Eigen	Uncertain	0.51
Eigen_PC	Benign	0.21
FATHMM_MKL	Benign	0.65	D
MutationTaster	Benign	1.0	A;A;A;A;A;A;N;N;N;N;N;N;N;N
Vest4		0.87
GERP RS		3.3

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: rs80356903; hg19: chr17-41243830; COSMIC: COSV100523463; COSMIC: COSV100523463;