2-214781245-GTT-G

Position:

• chr2-214781245-GTT-G

Variant summary

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

The NM_000465.4(BARD1):​c.627_628delAA​(p.Lys209fs) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000416 in 1,442,972 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000042 (0 hom.)
• Consequence: BARD1 NM_000465.4 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 2.37

Genes affected

BARD1 (HGNC:952): (BRCA1 associated RING domain 1) This gene encodes a protein which interacts with the N-terminal region of BRCA1. In addition to its ability to bind BRCA1 in vivo and in vitro, it shares homology with the 2 most conserved regions of BRCA1: the N-terminal RING motif and the C-terminal BRCT domain. The RING motif is a cysteine-rich sequence found in a variety of proteins that regulate cell growth, including the products of tumor suppressor genes and dominant protooncogenes. This protein also contains 3 tandem ankyrin repeats. The BARD1/BRCA1 interaction is disrupted by tumorigenic amino acid substitutions in BRCA1, implying that the formation of a stable complex between these proteins may be an essential aspect of BRCA1 tumor suppression. This protein may be the target of oncogenic mutations in breast or ovarian cancer. Multiple alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2013]

BARD1 (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 2-214781245-GTT-G is Pathogenic according to our data. Variant chr2-214781245-GTT-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 219726.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BARD1	NM_000465.4	c.627_628delAA	p.Lys209fs	frameshift_variant	4/11	ENST00000260947.9	NP_000456.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BARD1	ENST00000260947.9	c.627_628delAA	p.Lys209fs	frameshift_variant	4/11	1	NM_000465.4	ENSP00000260947.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000429 AC: 1 AN: 233042 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 125888

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: 0.00000923

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000416 AC: 6 AN: 1442972 Hom.: 0 AF XY: 0.00000418 AC XY: 3 AN XY: 717132

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: 0.00000542

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial cancer of breast Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 29, 2023	This sequence change creates a premature translational stop signal (p.Lys209Asnfs*4) in the BARD1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in BARD1 are known to be pathogenic (PMID: 20077502, 21344236). This variant is present in population databases (no rsID available, gnomAD 0.0009%). This premature translational stop signal has been observed in individual(s) with breast cancer and ovarian cancer (PMID: 26315354, 26534844). ClinVar contains an entry for this variant (Variation ID: 219726). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 13, 2024	- -
Pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	May 19, 2023	This variant is considered pathogenic. This variant creates a frameshift predicted to result in premature protein truncation. -

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Dec 03, 2024	The c.627_628delAA pathogenic mutation, located in coding exon 4 of the BARD1 gene, results from a deletion of two nucleotides at nucleotide positions 627 and 628, causing a translational frameshift with a predicted alternate stop codon (p.K209Nfs*4). This alteration has been identified in high-risk breast and ovarian cancer cohorts (Ramus SJ et al. J. Natl. Cancer Inst. 2015 Nov;107(11); Li J et al. J. Med. Genet., 2016 Jan;53:34-42). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). 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 20, 2020	This variant deletes 2 nucleotides in exon 4 of the BARD1 gene, creating a frameshift and 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 reported in one individual each affected with ovarian and breast cancer (PMID: 26315354, 26534844). This variant has been identified in 1/233042 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of BARD1 function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Feb 27, 2023

Frameshift 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 breast or ovarian cancer (Ramus et al., 2015; Li et al., 2016; Thompson et al., 2016); Not observed at a significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 26315354, 26534844, 35022142, 33804961, 33471991, 26786923, 29922827) -

Malignant tumor of breast Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

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

Jan 13, 2022

Variant summary: BARD1 c.627_628delAA (p.Lys209AsnfsX4) 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 4.3e-06 in 233042 control chromosomes (gnomAD). c.627_628delAA has been reported in the literature in multiple individuals affected with breast- or ovarian cancer (examples: Ramus_2015, Li_2016, Thompson_2016, and Dorling_2021). These data indicate that the variant is likely associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 and classified the variant as pathogenic (n=3) / likely pathogenic (n=1). Based on the evidence outlined above, the variant was classified as 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: rs864622223; hg19: chr2-215645969;