chr17-61683973-AC-A

Position:

• chr17-61683973-AC-A

Variant summary

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

The ENST00000259008.7(BRIP1):​c.3072del​(p.Ser1025HisfsTer34) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000479 in 1,461,868 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. G1024G) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: BRIP1 ENST00000259008.7 frameshift
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: -0.159

Genes affected

BRIP1 (HGNC:20473): (BRCA1 interacting helicase 1) The protein encoded by this gene is a member of the RecQ DEAH helicase family and interacts with the BRCT repeats of breast cancer, type 1 (BRCA1). The bound complex is important in the normal double-strand break repair function of breast cancer, type 1 (BRCA1). This gene may be a target of germline cancer-inducing mutations. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 22 pathogenic variants in the truncated region.
• PP5: Variant 17-61683973-AC-A is Pathogenic according to our data. Variant chr17-61683973-AC-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 461045.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-61683973-AC-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRIP1	NM_032043.3	c.3072del	p.Ser1025HisfsTer34	frameshift_variant	20/20	ENST00000259008.7	NP_114432.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRIP1	ENST00000259008.7	c.3072del	p.Ser1025HisfsTer34	frameshift_variant	20/20	1	NM_032043.3	ENSP00000259008	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000795 AC: 2 AN: 251440 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135890

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461868 Hom.: 0 Cov.: 34 AF XY: 0.00000413 AC XY: 3 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: 0.0000756

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Mar 27, 2023	This variant deletes 1 nucleotide in exon 20 of the BRIP1 gene, creating a frameshift at codon 1025 and premature translation stop signal at codon 1059 in the last coding exon. This mutant transcript is predicted to escape nonsense-mediated decay and be expressed as a truncated protein. This variant is predicted to truncate the carboxyl-terminus including domains involved in BRCA1-binding, DNA damage and replication stress responses and attenuation of DNA damage tolerance pathway in vitro (PMID: 11301010, 14983014, 20159562, 20173781, 22792074). This variant has been reported in individuals affected with breast cancer (PMID: 29752822, 34793666, 34897210), gastric cancer (PMID: 25877891), Peutz-Jeghers syndrome (PMID: 34754157), and upper tract urothelial carcinoma (PMID: 36630951). This variant has been identified in 2/251440 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of BRIP1 function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Likely Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Apr 29, 2024	The c.3072delG variant, located in coding exon 19 of the BRIP1 gene, results from a deletion of one nucleotide at nucleotide position 3072, causing a translational frameshift with a predicted alternate stop codon (p.S1025Hfs*34). Premature stop codons are typically deleterious in nature, however, this stop codon occurs at the 3' terminus of BRIP1, is not expected to trigger nonsense-mediated mRNA decay, and removes the last 191 amino acids of the protein. The exact functional impact of these removed amino acids is unknown at this time; however, the C-terminal region of the protein has been shown by structural, biochemical, and mutational analysis to be relevant for the protein function (Leung CC et al. J. Biol. Chem. 2011 Feb; 286(6):4292-301. Xie J et al. PLoS Genet. 2012 Jul; 8(7):e1002786; Gong Z et al. Mol. Cell, 2010 Feb;37:438-46). Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Familial cancer of breast;C1836860:Fanconi anemia complementation group J Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 27, 2023

This sequence change creates a premature translational stop signal (p.Ser1025Hisfs*34) in the BRIP1 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 225 amino acid(s) of the BRIP1 protein. This variant is present in population databases (no rsID available, gnomAD 0.01%). This premature translational stop signal has been observed in individual(s) with gastric cancer, biliary tract cancer, and upper tract urothelial carcinoma (PMID: 25877891, 29752822, 36243179, 36630951). This variant is also known as p.G1024fs. ClinVar contains an entry for this variant (Variation ID: 461045). This variant disrupts the TopBP1-binding region of the BRIP1 protein, which plays a critical role in RPA chromatin loading and the activation of the replication checkpoint in response to DNA damage (PMID: 20159562, 21127055). While functional studies have not been performed to directly test the effect of this variant on BRIP1 protein function, this suggests that disruption of this region of the protein is causative of disease. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Gastric cancer Pathogenic:1

Pathogenic, no assertion criteria provided

research

Laboratory for Genotyping Development, RIKEN

Jul 01, 2021

- -

not provided Pathogenic:1

Pathogenic, no assertion criteria provided

curation

Leiden Open Variation Database

Aug 13, 2019

Curator: Arleen D. Auerbach. Submitter to LOVD: Yukihide Momozawa. -

Hereditary breast ovarian cancer syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

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

Oct 06, 2022

Variant summary: BRIP1 c.3072delG (p.Ser1025HisfsX34) 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 likely pathogenic by our laboratory. The variant allele was found at a frequency of 8e-06 in 251440 control chromosomes (gnomAD). c.3072delG has been reported in the literature in individuals affected with Breast or Gastric Cancer (Jones_2015, Li_2018, Park_2021). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four ClinVar submitters (evaluation after 2014) cite the variant as uncertain significance (n=1), likely pathogenic (n=2) and pathogenic (n=1). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

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: rs1342519012; hg19: chr17-59761334;