NM_007294.4:c.68_69delAG

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PM5_StrongPS3PVS1

This summary comes from the ClinGen Evidence Repository: The c.68_69del variant in BRCA1 is a deletion of two nucleotides, predicted to encode a frameshift with consequent premature termination of the protein at codon 17 of the frameshift, or amino acid 39 (p.Glu23ValfsTer17). This variant is present in gnomAD v2.1 (exomes only, non-cancer subset) or gnomAD v3.1 (non-cancer subset) but is below the ENIGMA BRCA1/2 VCEP threshold >0.00002 for BS1_Supporting (PM2_Supporting, BS1, and BA1 are not met). Frameshift variant predicted to cause a premature stop codon in biologically-relevant-exon 3 leading to nonsense mediated decay (PVS1 met). The ENIGMA BRCA1/2 VCEP considered multiple lines of functional and clinical evidence to define exon-specific weights for PTC in BRCA1, and results indicate that strong evidence towards pathogenicity may be applied for a PTC variant in BRCA1 exon 3 (PM5_Strong (PTC)). Reported by one calibrated study to exhibit protein function similar to pathogenic control variants (PMID:32546644) (PS3 met).In summary, this variant meets the criteria to be classified as a Pathogenic variant variant for BRCA1-related cancer predisposition based on the ACMG/AMP criteria applied as specified by the ENIGMA BRCA1/2 VCEP (PVS1, PM5_Strong (PTC), PS3). LINK:https://erepo.genome.network/evrepo/ui/classification/CA003783/MONDO:0011450/092

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

BRCA1
NM_007294.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic reviewed by expert panel P:83O:3

Conservation

PhyloP100: 3.57

Publications

123 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

For more information check the summary or visit ClinGen Evidence Repository.

PS3

For more information check the summary or visit ClinGen Evidence Repository.

PM5

For more information check the summary or visit ClinGen Evidence Repository.

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.68_69delAG	p.Glu23ValfsTer17	frameshift	Exon 2 of 23	NP_009225.1
BRCA1	NM_001407581.1		c.68_69delAG	p.Glu23ValfsTer17	frameshift	Exon 2 of 24	NP_001394510.1
BRCA1	NM_001407582.1		c.68_69delAG	p.Glu23ValfsTer17	frameshift	Exon 2 of 24	NP_001394511.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
BRCA1	ENST00000357654.9	TSL:1 MANE Select	c.68_69delAG	p.Glu23ValfsTer17	frameshift	Exon 2 of 23	ENSP00000350283.3
BRCA1	ENST00000471181.7	TSL:1	c.68_69delAG	p.Glu23ValfsTer17	frameshift	Exon 2 of 24	ENSP00000418960.2
BRCA1	ENST00000470026.6	TSL:1	c.68_69delAG	p.Glu23ValfsTer17	frameshift	Exon 2 of 23	ENSP00000419274.2

Frequencies

GnomAD3 genomes

AF:

0.000145

AC:

AN:

152150

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00548

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000227

AC:

AN:

251050

AF XY:

0.000251

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00407

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000970

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000116

AC:

169

AN:

1459934

Hom.:

AF XY:

0.000142

AC XY:

103

AN XY:

726416

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33426

American (AMR)

AF:

0.0000447

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00398

AC:

104

AN:

26112

East Asian (EAS)

AF:

0.00

AC:

AN:

39644

South Asian (SAS)

AF:

0.0000580

AC:

AN:

86210

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.000174

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0000333

AC:

AN:

1110344

Other (OTH)

AF:

0.000332

AC:

AN:

60304

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.442

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:

0.000145

AC:

AN:

152150

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

74332

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41428

American (AMR)

AF:

0.0000655

AC:

AN:

15278

Ashkenazi Jewish (ASJ)

AF:

0.00548

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5200

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68022

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

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:

0.000651

Hom.:

Bravo

AF:

0.000125

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000237

ClinVar

ClinVar submissions as Germline

Significance:Pathogenic

Revision:reviewed by expert panel

View on ClinVar

Pathogenic

VUS

Benign

Condition

Breast-ovarian cancer, familial, susceptibility to, 1 (32)

not provided (16)

Hereditary breast ovarian cancer syndrome (14)

Hereditary cancer-predisposing syndrome (5)

Familial cancer of breast (4)

Breast and/or ovarian cancer (3)

BRCA1-related cancer predisposition (2)

BRCA1-related disorder (1)

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

Endometrial carcinoma (1)

Fanconi anemia, complementation group S (1)

Inherited ovarian cancer (without breast cancer) (1)

Invasive medullary breast carcinoma (1)

Malignant tumor of breast (1)

Ovarian neoplasm (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

3.6

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

Computational scores

Splicing

Publications

Other links and lift over