17-43057062-T-TG

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong

The NM_007294.4(BRCA1):c.5266dupC(p.Gln1756ProfsTer74) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000675 in 1,613,912 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. Q1756Q) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000069 ( 0 hom. )

Consequence

BRCA1
NM_007294.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic reviewed by expert panel P:84U:1O:3

Conservation

PhyloP100: 2.46

Publications

428 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

breast-ovarian cancer, familial, susceptibility to, 1
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
Fanconi anemia, complementation group S
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), ClinGen, Ambry Genetics
pancreatic cancer, susceptibility to, 4
Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
hereditary breast ovarian cancer syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Fanconi anemia
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

BRCA1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 16 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PP5

Variant 17-43057062-T-TG is Pathogenic according to our data. Variant chr17-43057062-T-TG is described in ClinVar as Pathogenic. ClinVar VariationId is 17677.Status of the report is reviewed_by_expert_panel, 3 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_007294.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
BRCA1	NM_007294.4	MANE Select	c.5266dupC	p.Gln1756ProfsTer74	frameshift	Exon 19 of 23	NP_009225.1
BRCA1	NM_001407581.1		c.5332dupC	p.Gln1778ProfsTer74	frameshift	Exon 20 of 24	NP_001394510.1
BRCA1	NM_001407582.1		c.5332dupC	p.Gln1778ProfsTer74	frameshift	Exon 20 of 24	NP_001394511.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
BRCA1	ENST00000357654.9	TSL:1 MANE Select	c.5266dupC	p.Gln1756ProfsTer74	frameshift	Exon 19 of 23	ENSP00000350283.3
BRCA1	ENST00000471181.7	TSL:1	c.5329dupC	p.Gln1777ProfsTer74	frameshift	Exon 20 of 24	ENSP00000418960.2
BRCA1	ENST00000470026.6	TSL:1	c.5266dupC	p.Gln1756ProfsTer74	frameshift	Exon 19 of 23	ENSP00000419274.2

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152180

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00115

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000183

AC:

AN:

251494

AF XY:

0.000125

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00238

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000176

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000691

AC:

101

AN:

1461732

Hom.:

Cov.:

AF XY:

0.0000853

AC XY:

AN XY:

727176

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33474

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00119

AC:

AN:

26128

East Asian (EAS)

AF:

0.00

AC:

AN:

39696

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000540

AC:

AN:

1111888

Other (OTH)

AF:

0.000149

AC:

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.483

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000526

AC:

AN:

152180

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74344

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41456

American (AMR)

AF:

0.00

AC:

AN:

15270

Ashkenazi Jewish (ASJ)

AF:

0.00115

AC:

AN:

3464

East Asian (EAS)

AF:

0.00

AC:

AN:

5192

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000588

AC:

AN:

68038

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.563

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000400

Hom.:

Bravo

AF:

0.0000340

EpiCase

AF:

0.000164

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:84Uncertain:1Other:3

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Breast-ovarian cancer, familial, susceptibility to, 1

Pathogenic:41

Oct 15, 2008

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

Mar 05, 2022

DASA

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.5266dup;p.(Gln1756Profs*74) is a null frameshift variant (NMD) in the BRCA1 gene and predicts alteration of the nonsense-mediate decay - NMD is present in a relevant exon to the transcript - PVS1_strong. This sequence change has been observed in affected individual(s) and ClinVar contains an entry for this variant (ClinVar ID: 17677; PMID: 15994883; PMID: 22430266) - PS4. The variant is present at low allele frequencies population databases (rs80357906 – gnomAD 0.001803%; ABraOM no frequency - http://abraom.ib.usp.br/) - PM2_supporting. In summary, the currently available evidence indicates that the variant is pathogenic.

Jan 28, 2022

New York Genome Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.5266dup (p.Gln1756ProfsTer74) variant identified in the BRCA1 gene is the duplication of a single nucleotide resulting in a frameshift at amino acid 1756/1863 (exon 19/23). This variant is predicted to incorporate a premature termination codon at approximately 74 amino acids downstream and result in either loss-of-function via nonsense mediated decay or protein truncation. This variant is found with low frequency in gnomAD(v3.1.2) (8 heterozygotes, 0 homozygotes; allele frequency: 1.972e-5), suggesting it is not a common benign variant in the populations represented in that database. The c.5266dup (p.Gln1756ProfsTer74) variant is reported in ClinVar as Pathogenic by an expert panel (VarID: 17677), and is one of the most frequently reported pathogenic variants in the BRCA1 gene. This variant has been reported in multiple affected individuals in the literature [PMID: 21119707, 24797986, 31706072, others]. Based on the available evidence c.5266dup(p.Gln1756ProfsTer74) variant is reported as Pathogenic.

Sep 21, 2015

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jul 01, 2015

Department of Medical Genetics, Oslo University Hospital

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Medical Genetics, Medical University Pleven

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:research

May 28, 2019

Mendelics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Apr 02, 2020

Department of Molecular Diagnostics, Institute of Oncology Ljubljana

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Mar 17, 2024

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Apr 22, 2024

Molecular Pathology, Peter Maccallum Cancer Centre

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Aug 26, 2022

BRCAlab, Lund University

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Jan 10, 2022

Genetic Services Laboratory, University of Chicago

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

DNA sequence analysis of the BRCA1 gene demonstrated a single base pair duplication in exon 19, c.5266dup. This pathogenic sequence change results in an amino acid frameshift and creates a premature stop codon 74 amino acids downstream of the change, p.Gln1756Profs*74. This pathogenic sequence change is predicted to result in an abnormal transcript, which may be degraded, or may lead to the production of a truncated BRCA1 protein with potentially abnormal function. This sequence change has been described in the gnomAD database with a frequency of 0.23% in the Ashkenazi Jewish subpopulation (dbSNP rs1217805587). This pathogenic sequence change is a well-described pathogenic BRCA1 variant and a known founder mutation in the Ashkenazi Jewish population reported in multiple individuals with hereditary breast and ovarian cancer syndrome (PMID: 12473589, 15131399, 9042909, 22430266, 24764757, 26976419). The c.5266dup sequence change is also referred to as 5382insC in the scientific literature

Institute of Genomics, University of Tartu

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

Apr 22, 2016

Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA)

Significance:Pathogenic

Review Status:reviewed by expert panel

Collection Method:curation

Variant allele predicted to encode a truncated non-functional protein.

Jul 07, 2014

Counsyl

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com.

Oct 02, 2015

Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA), c/o University of Cambridge

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Oct 29, 2021

Johns Hopkins Genomics, Johns Hopkins University

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This BRCA1 variant (rs80357906) is rare (<0.1%) in a large population dataset (gnomAD: 51/282892 total alleles, 0.018%, no homozygotes) and has been reported in ClinVar. This frameshift variant results in a premature stop codon in exon 19 of 23 likely leading to nonsense-mediated decay and lack of protein production. This variant, also known as 5382insC and 5385insC in the literature, is a common cause of breast and ovarian cancer in the Ashkenazi Jewish population and has been reported in individuals from other ethnicities. This variant has been associated with a 67% to 89% risk of breast cancer by age 70, and a 33% to 42% risk of ovarian cancer by age 70. This variant was also identified in the patient's mother (JHG1740-2). We consider c.5266dupC to be pathogenic.

Apr 08, 2014

Sharing Clinical Reports Project (SCRP)

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Dec 10, 2015

HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

Dec 09, 2022

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

PVS1, PS4_STR, BS1

Jan 01, 2017

Genologica Medica

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Aug 04, 2022

Human Genetics Bochum, Ruhr University Bochum

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ACMG criteria used to clasify this variant: PVS1, PM2, PS4

Feb 11, 2015

Institute of Human Genetics, Medical University Innsbruck

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Feb 02, 2024

Institute of Immunology and Genetics Kaiserslautern

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ACMG Criteria: PM2_P; Variant was found in heterozygous state

Mar 11, 2024

Clinical Genomics Laboratory, Washington University in St. Louis

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The BRCA1 c.5266dup (p.Gln1756Profs*74) variant is one of the most common variants reported in Central and Eastern European families with high risk of breast and/or ovarian cancer (Janavicius R, PMID: 23199084). This variant causes a frameshift by inserting one nucleotide, leading to a premature termination codon, which is predicted to lead to nonsense mediated decay. This variant has been reported in the ClinVar database as a germline pathogenic variant by 10 submitters. Based on available information and the ACMG/AMP guidelines for variant interpretation (Richards S et al., PMID: 25741868), this variant is classified as pathogenic.

May 29, 2002

Breast Cancer Information Core (BIC) (BRCA1)

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Aug 11, 2025

Institute of Human Genetics, University of Leipzig Medical Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Criteria applied: PVS1,PS4,PM5_STR

Biomedical Genomics and Oncogenetics Laboratory, Institut Pasteur de Tunis, University Tunis El Manar

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Sep 06, 2022

MGZ Medical Genetics Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

May 25, 2017

Human Genome Sequencing Center Clinical Lab, Baylor College of Medicine

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.5266dup (p.Gln1756Profs*74) variant in the BRCA1 gene has been detected multiple patients with breast cancer and/or ovarian cancer [PMID 7894492, 26718727, 20569256, 21503673, 23232912, 26666763, 22430266, 19359128, 20730485, 22032251, 21324516, among others, referred as 5382C in some publications], pancreatic cancer [PMID 24737347, 26440929] and prostate cancer [PMID 27433846 ]. This variant is a founder mutation in the Ashkenazi Jewish population and is found with a high prevalence in Poland and Eastern Europe [PMID 20569256, 20345474, 20507347]. The estimated risk for carriers of this variant was 89% for breast cancer and 42% for ovarian cancer by age 70 [PMID 22430266]. This one bp duplication in exon 19 results in a frameshift and the creation of a premature stop codon. This variant is thus predicted to result in a loss of function of the protein. This variant has been detected in 19 individuals from the ExAC database (http://exac.broadinstitute.org/variant/17-41209079-T-TG). This variant thus classified as pathogenic.

Nov 03, 2014

Michigan Medical Genetics Laboratories, University of Michigan

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jul 24, 2014

Pathway Genomics

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

May 18, 2023

Illumina Laboratory Services, Illumina

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The BRCA1 c.5266dup (p.Gln1756ProfsTer74) variant, also referred to as c.5382insC or c.5382_5383insC, causes a shift in the translational reading frame that is predicted to result in premature termination of the protein. Loss of normal protein function through either protein truncation or nonsense-mediated mRNA decay is expected. This variant has been previously identified in individuals with breast cancer, ovarian cancer, pancreatic cancer, and prostate cancer (PMID: 29335925; PMID: 29961768; PMID: 11802209; PMID: 29492181; PMID: 22430266). Further, this variant is one of three well-characterized founder variants in the Ashkenazi Jewish population, accounting for an estimated 26% of pathogenic variants detected in this population (GeneReviews PMID: 20301425). The highest frequency of this allele in the Genome Aggregation Database is 0.002314 in the Ashkenazi Jewish population (v2.1.1). This variant has been classified as pathogenic by >60 submitters in ClinVar, including a BRCA1 expert panel. Based on the available evidence, the c.5266dup (p.Gln1756ProfsTer74) variant is classified as pathogenic for hereditary breast and ovarian cancer.

Feb 14, 2025

3billion

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The variant is observed in the gnomAD v4.1.0 dataset (total allele frequency: 0.007%). Predicted Consequence/Location: Frameshift: predicted to result in a loss or disruption of normal protein function through nonsense-mediated decay (NMD) or protein truncation. Multiple pathogenic variants are reported downstream of the variant. The variant has been reported multiple times as an established pathogenic variant (ClinVar ID: VCV000017677 /PMID: 7894492 /3billion dataset). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline.

Oct 10, 2014

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Aug 23, 2021

Genetics and Molecular Pathology, SA Pathology

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Dec 13, 2022

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ACMG classification criteria: PVS1 very strong, PS3 supporting, PS4 strong, PP1 strong

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

May 27, 2024

Department of Clinical Genetics, Copenhagen University Hospital, Rigshospitalet

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PVS1; PM5_PTC_Strong

Jul 17, 2023

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as Pathogenic. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with Fanconi anaemia, complementation group S (MIM#617883), susceptibility to breast and ovarian cancer (MIM#604370) and susceptibility to pancreatic cancer (MIM#614320). (I) 0108 - This gene is associated with both recessive and dominant disease. Susceptibility to breast and ovarian cancer follows an autosomal dominant inheritance pattern, while Fanconi anaemia is inherited in an autosomal recessive pattern (OMIM). (I) 0112 - The condition associated with this gene has incomplete penetrance. The highest estimate for cancer risk in carriers of pathogenic variants is 80% by the age of 70 years (PMID: 30551077). (I) 0205 - Variant is predicted to result in a truncated protein (premature termination codon is NOT located at least 54 nucleotides upstream of the final exon-exon junction) with less than 1/3 of the protein sequence affected. (SP) 0251 - This variant is heterozygous. (I) 0304 - Variant is present in gnomAD <0.01 (v2 & v3: 53 heterozygotes, 0 homozygotes). (SP) 0701 - Other variants located downstream and predicted to result in a truncated protein comparable to the one identified in this case have very strong previous evidence for pathogenicity (DECIPHER). (SP) 0801 - This variant has very strong previous evidence of pathogenicity in unrelated individuals. It is regarded as pathogenic by multiple diagnostic laboratories including expert panel ENIGMA and associated with susceptibility to breast cancer (ClinVar). In addition, it is a founder mutation in Ashkenazi Jewish (GeneReviews). (SP) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign

Jan 22, 2024

St. Jude Molecular Pathology, St. Jude Children's Research Hospital

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The BRCA1 c.5266dup (p.Gln1756ProfsTer74) change duplicates one nucleotide to cause a frameshift and the creation of a premature stop codon. This change is predicted to cause protein truncation. This variant, which is also known as c.5382insC in published literature, has been reported in several individuals with BRCA1-related cancers (PMID: 7894492, 9634504, 10739756, 22666503, 24737347, 26440929, 27433846, 32058061) and is an Ashkenazi Jewish founder mutation (PMID: 30152102). In summary, this variant meets criteria to be classified as pathogenic.

not provided

Pathogenic:16Other:1

Nov 07, 2024

Revvity Omics, Revvity

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Dec 08, 2023

Mayo Clinic Laboratories, Mayo Clinic

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PP5, PS4_moderate, PVS1

Jan 17, 2024

Institute of Human Genetics, FAU Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant has been identified by standard clinical testing. female patient with metastatic breast cancer Selected ACMG criteria: Pathogenic (I):PP5;PS4;PVS1

Feb 16, 2025

Laboratory of Genetics, Children's Clinical University Hospital Latvia

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Mar 18, 2024

Clinical Genetics Laboratory, Skane University Hospital Lund

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

GenomeConnect, ClinGen

Significance:not provided

Review Status:no classification provided

Collection Method:phenotyping only

GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant.

Feb 12, 2020

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Frameshift variant predicted to result in protein truncation in a gene for which loss-of-function is a known mechanism of disease; Truncating variants in this gene are considered pathogenic by a well-established clinical consortium and/or database; Also known as 5382insC or 5385insC; This variant is associated with the following publications: (PMID: 25859162, 25849179, 27160020, 26843898, 26852130, 26833046, 27025497, 27062684, 26681312, 29790872, 26440929, 30067863, 31336956, 32854451, 24372583, 21119707, 26656232, 26083025, 25476495, 24528374, 25195694, 22032251, 7894492, 16168118, 27223485, 26779294, 27433846, 26666763, 26718727, 29478780, 27425403, 22009639, 20569256, 21503673, 23232912, 20345474, 22430266, 29335925, 28285342, 22535016, 29339979, 23954390, 29433453, 29335924, 29492181, 21834074, 24737347, 19359128, 27914478, 28324225, 22666503, 27989354, 29907814, 20730485, 28091860, 28503720, 26556299, 10464624, 28423363, 20507347, 22006311, 25980754, 21324516, 29310832, 30333958, 30159786, 29161300, 30606148, 30152102, 28049106, 28111427, 30186769, 29961768, 30322717, 31090900, 31159747, 30113427, 23199084, 8841191, 30676620, 30489631, 31454914, 12771565, 31528241, 27741520, 29625052, 26689913, 32058061, 31447099, 32039725)

Nov 03, 2021

Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Sep 18, 2014

Clinical Genetics and Genomics, Karolinska University Hospital

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Nov 07, 2014

Eurofins Ntd Llc (ga)

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Oct 23, 2020

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Sep 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

BRCA1: PVS1, PS4:Moderate

Jun 04, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The BRCA1 c.5266dup (p.Gln1756Profs*74) variant alters the translational reading frame of the BRCA1 mRNA and causes the premature termination of BRCA1 protein synthesis. This variant has been reported in the published literature as a founder mutation in the Ashkenazi Jewish population and has been reported in multiple individuals and families affected with breast and/or ovarian cancer (PMIDs: 18694767 (2008), 19208665 (2009), 21119707 (2011), 30606148 (2019), 32438681 (2020), 35409996 (2022)), as well as prostate cancer (PMID: 36612302 (2023)). This variant has also been reported in affected and control individuals in a large-scale breast cancer association study (PMID: 33471991 (2021), see also LOVD (http://databases.lovd.nl/shared/)). A functional study showed that this variant caused the complete loss of BRCA1 phosphopeptide binding activity (PMID: 15133502 (2004)). Based on the available information, this variant is classified as pathogenic.

Clinical Genetics Laboratory, Department of Pathology, Netherlands Cancer Institute

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Nov 12, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The BRCA1 c.5266dup; p.Gln1756ProfsTer74 variant, also known as 5382insC, has been described in individuals and families with hereditary breast and ovarian cancer, peritoneal cancer, and pancreatic cancer and is a known pathogenic founder variant (Bogdanova 2010, Elsakov 2010, Heidemann 2012, Simard 1994, Uglanitsa 2010, Zhang 2011). This variant is reported as pathogenic in ClinVar (Variation ID: 17677). It is found in the general population with an overall allele frequency of 0.02% (51/282892 alleles) in the Genome Aggregation Database. This variant causes a frameshift by duplicating a single nucleotide, so it is predicted to result in a truncated protein or mRNA subject to nonsense-mediated decay. Based on available information, this variant is considered to be pathogenic. References: Bogdanova NV et al. High frequency and allele-specific differences of BRCA1 founder mutations in breast cancer and ovarian cancer patients from Belarus. Clin Genet. 2010 78(4):364-72. PMID: 20569256. Elsakov P et al. The contribution of founder mutations in BRCA1 to breast and ovarian cancer in Lithuania. Clin Genet. 2010 78(4):373-6. PMID: 20345474. Heidemann S et al. Double heterozygosity for mutations in BRCA1 and BRCA2 in German breast cancer patients: implications on test strategies and clinical management. Breast Cancer Res Treat. 2012 134(3):1229-39. PMID: 22535016. Simard J et al. Common origins of BRCA1 mutations in Canadian breast and ovarian cancer families. Nat Genet. 1994 8(4):392-8. PMID: 7894492. Uglanitsa N et al. The contribution of founder mutations in BRCA1 to breast cancer in Belarus. Clin Genet. 2010 78(4):377-80. PMID: 20507347. Zhang S et al. Frequencies of BRCA1 and BRCA2 mutations among 1,342 unselected patients with invasive ovarian cancer. Gynecol Oncol. 2011 121(2):353-7. PMID: 21324516.

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Hereditary breast ovarian cancer syndrome

Pathogenic:8Other:1

Feb 02, 2017

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Apr 22, 2016

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

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: The BRCA1 c.5266dupC variant results in a frameshift, which alters the protein's amino acid sequence beginning at position 1756 and leads to a premature termination codon 73 amino acids downstream. It is predicted to cause a truncated or absent BRCA1 protein due to non-sense meditated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory (such as c.5387C>A/p.Ser1796X, c.5417delC/Pro1806fsX28, etc). Mutation Taster predicts a damaging outcome for this variant, and functional studies have shown HR activity is significantly impaired by this variant (Bouwman_BRCA1_Cancer Discovery_2013). BRCA1 c.5266dupC was found in 19/121412 control chromosomes at a frequency of 0.0001565, which does not exceed maximal expected frequency of a pathogenic BRCA1 allele (0.0010005). The variant has been cited in hundreds of HBOC patients and is reported as a known common founder mutation in the literature. Additionally, this variant has been classified by multiple clinical labs and databases as pathogenic. Taken together, this variant was classified as disease variant/pathogenic.

Jan 31, 2014

Research Molecular Genetics Laboratory, Women's College Hospital, University of Toronto

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:research

Jan 09, 2021

GeneKor MSA

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This mutation is an insertion of one nucleotide (cytosine), resulting in a frameshift and the creation of a novel translational termination codon after 74 amino acid residues. The protein product thus produced is truncated and non-functional. This mutation has been described in the international bibliography (http://research.nhgri.nih.gov/projects/bic) and has been shown to be a founder mutation in a number of ethnic groups (PMID: 12142080). This mutation has been described in the mutation database ClinVar (Variation ID:17677).

Feb 14, 2017

Institute for Biomarker Research, Medical Diagnostic Laboratories, L.L.C.

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change creates a premature translational stop signal (p.Gln1756Profs*74) in the BRCA1 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 108 amino acid(s) of the BRCA1 protein. This variant is present in population databases (rs397507247, gnomAD 0.2%), and has an allele count higher than expected for a pathogenic variant. This premature translational stop signal has been observed in individual(s) with breast and ovarian cancer. It is commonly reported in individuals of Ashkenazi Jewish ancestry (PMID: 9042909, 22185575, 22430266). This variant is also known as 5382insC and 5385insC. ClinVar contains an entry for this variant (Variation ID: 17677). This variant has been associated with a 67% to 89% risk of breast cancer by age 70, and a 33% to 42% risk of ovarian cancer by age 70 (PMID: 15994883, 22430266). This variant disrupts a region of the BRCA1 protein in which other variant(s) (Deletion (Exon 23)) have been determined to be pathogenic (PMID: 18431737, 24825132, 25428789; internal data). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic.

Nov 16, 2021

National Health Laboratory Service, Universitas Academic Hospital and University of the Free State

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Nov 23, 2022

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.Gln1756ProfsX74 variant in BRCA1 (also referred to as p.Gln1777fs) is a founder variant in the Ashkenazi Jewish population and has been reported in >1000 individuals with BRCA1-associated cancers (Abeliovich 1997 PMID: 9042909, Elwad 2011 PMID: 22185575, Breast Cancer Information Core (BIC) database). This variant has also been identified in 0.2% (24/103702) Ashkenazi Jewish and 0.02% (25/129200) of European chromosomes by gnomAD (http://gnomad.broadinstitute.org). This variant is predicted to cause a frameshift, which alters the protein’s amino acid sequence beginning at position 1756 and leads to a premature termination codon 74 amino acids downstream. This alteration is then predicted to lead to a truncated or absent protein. Heterozygous loss of function of the BRCA1 gene is an established disease mechanism in hereditary breast and ovarian cancer (HBOC). Furthermore, the p.Gln1756ProfsX74 variant was classified as Pathogenic on April 22, 2016 by the ClinGen-approved ENIGMA expert panel (ClinVar ID 17677). In summary, this variant meets criteria to be classified as pathogenic for autosomal dominant HBOC. ACMG/AMP Criteria applied: PS4, PVS1.

GeneReviews

Significance:not provided

Review Status:no classification provided

Collection Method:literature only

Founder variant in Ashkenazi Jews; accounts for 26% of pathogenic variants in this population

Familial cancer of breast

Pathogenic:4

Feb 23, 2017

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jun 03, 2019

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was classified as: Pathogenic. The following ACMG criteria were applied in classifying this variant: PVS1,PS1.

Nov 25, 2024

Institute of Human Genetics, University of Leipzig Medical Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Criteria applied: PVS1,PS4,PM5_STR

Bioscientia Institut fuer Medizinische Diagnostik GmbH, Sonic Healthcare

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Breast and/or ovarian cancer

Pathogenic:3

Mar 24, 2023

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jun 11, 2019

CZECANCA consortium

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Jul 07, 2016

Foulkes Cancer Genetics LDI, Lady Davis Institute for Medical Research

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Hereditary cancer-predisposing syndrome

Pathogenic:3

Sep 02, 2025

Ambry Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.5266dupC (p.Q1756Pfs*74) alteration, located in exon 19 (coding exon 18) of the BRCA1 gene, consists of a duplication of C at position 5266, causing a translational frameshift with a predicted alternate stop codon after 74 amino acids. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. Based on data from gnomAD, the CC allele has an overall frequency of 0.018% (51/282892) total alleles studied. The highest observed frequency was 0.231% (24/10370) of Ashkenazi Jewish alleles. This variant is one of three well-characterized Ashkenazi Jewish founder mutations, with an overall carrier frequency of nearly 0.5% in this population, but has also been shown to occur at high frequency in many other European populations (Hartge, 1999; Hamel, 2011; Kluz, 2018). This variant has been reported in individuals with hereditary breast and ovarian cancer (HBOC) syndrome, including individuals with male breast cancer, pancreatic cancer, and prostate cancer (Antoniou, 2005; Bogdanova, 2010; Finkelman, 2012; Yurgelun, 2015; Bernards, 2016; Pritchard, 2016; Kluz, 2018; Fostira, 2018). In a large case control-study, this variant was reported in 97/60,466 breast cancer cases and in 11/53,461 controls (Breast Cancer Association, 2021). Of note, this variant is also designated as 5382insC and 5385insC in the published literature. Based on the available evidence, this alteration is classified as pathogenic.

Mar 31, 2025

Color Diagnostics, LLC DBA Color Health

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant (also known as 5382insC and 5385insC) inserts 1 nucleotide in exon 19 of the BRCA1 gene, causing a frameshift and a premature translational stop signal in the last exon. The mutant transcript is expected to escape nonsense-mediated decay and be expressed as a truncated protein that lacks the C-terminal BRCT domain. Experimental studies have shown that variant impacts BRCA1 function in homology-directed repair and subcellular localization assays (PMID: 14729053, 23867111). This variant is a well-known founder mutation in the Ashkenazi Jewish population and occurs at 0.13-0.28% minor allele frequency (PMID: 8841191, 9145676, 11466700, 30152102). This variant has been reported in numerous individuals affected with breast and/or ovarian cancer (PMID: 7545954, 7894492, 8531967, 9042909, 9150153, 17922257, 18334730, 21643751, 22430266, 25418591, 29335925, 30480775, 30606148, 30975216). This variant is the most globally frequent, pathogenic BRCA1 variant and has been reported in diverse populations in Africa, America, Asia and Europe (PMID: 24312913). The risk of female breast cancer among carriers of this mutation is 67-89% by age 70, and the risk of ovarian cancer is 22-42% by age 70 (PMID: 9145676, 15994883, 22430266). A breast cancer case-control meta-analysis has reported this variant in 97/60369 cases and 11/53450 controls with an estimated OR of 7.808 (95%CI 4.185 to 14.567) (PMID: 33471991; Leiden Open Variation Database DB-ID BRCA1_000440). This variant has been identified in 51/282892 chromosomes (24/10370 Ashkenazi Jewish chromosomes and 25/129200 Non-Finnish European chromosomes) in the general population by the Genome Aggregation Database (gnomAD). Loss of BRCA1 function is a known mechanism of disease. Based on the available evidence, this variant is classified as Pathogenic.

Apr 27, 2018

True Health Diagnostics

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Ovarian neoplasm

Pathogenic:2

May 29, 2014

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Dec 01, 2018

German Consortium for Hereditary Breast and Ovarian Cancer, University Hospital Cologne

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:research

Punctate palmoplantar keratoderma type 2

Pathogenic:1

Jul 21, 2017

Bioinformatics dept., Datar Cancer Genetics Limited, India

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Inherited breast cancer and ovarian cancer

Pathogenic:1

Oct 23, 2024

Genomics and Molecular Medicine Service, East Genomic Laboratory Hub, NHS Genomic Medicine Service

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PVS1,PM5_Strong

Breast-ovarian cancer, familial, susceptibility to, 1;C3280442:Pancreatic cancer, susceptibility to, 4;C4554406:Fanconi anemia, complementation group S

Pathogenic:1

Mar 14, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Breast neoplasm

Pathogenic:1

Clinical and Functional Genomics Group, A.C.Camargo Cancer Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

BRCA1-related cancer predisposition

Pathogenic:1

Sep 28, 2024

All of Us Research Program, National Institutes of Health

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

BRCA1-related disorder

Pathogenic:1

Jun 26, 2024

PreventionGenetics, part of Exact Sciences

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

The BRCA1 c.5266dupC variant is predicted to result in a frameshift and premature protein termination (p.Gln1756Profs*74). This variant (also described as 5382insC, 5385insC, or 5329dupC) has been reported in multiple individuals with autosomal dominant hereditary breast and ovarian cancer syndrome (HBOC) (OMIM #604370; Bogdanova et al. 2010. PubMed ID: 20569256; Alemar et al. 2016. PubMed ID: 27425403; Azzollini et al. 2016. PubMed ID: 27062684; Hamel et al. 2011. PubMed ID: 21119707). It is a founder variant in the Ashkenazi Jewish population and is reported in 0.23% of alleles in individuals of Ashkenazi Jewish descent in gnomAD. It is interpreted as pathogenic in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/17677/). Frameshift variants in BRCA1 are expected to be pathogenic. In summary, this variant is interpreted as pathogenic.

Endometrial carcinoma

Pathogenic:1

Feb 21, 2023

CZECANCA consortium

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Malignant tumor of breast

Uncertain:1

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Uncertain significance

Review Status:flagged submission

Collection Method:clinical testing

Pancreatic cancer, susceptibility to

Other:1

Oct 15, 2008

OMIM

Significance:risk factor

Review Status:no assertion criteria provided

Collection Method:literature only

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

2.5

Mutation Taster

=0/200

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

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