• 3
    Haplo
    Score
  • 0
    Triplo
    Score

Gene Facts External Data Attribution

HGNC Symbol
BARD1 (HGNC:952) HGNC Entrez Ensembl OMIM UCSC Uniprot GeneReviews LOVD LSDB ClinVar
HGNC Name
BRCA1 associated RING domain 1
Gene type
protein-coding gene
Locus type
gene with protein product
Previous symbols
No previous names found
Alias symbols
No aliases found
%HI
33.35(Read more about the DECIPHER Haploinsufficiency Index)
pLI
0(Read more about gnomAD pLI score)
LOEUF
1.36(Read more about gnomAD LOEUF score)
Cytoband
2q35
Genomic Coordinates
GRCh37/hg19: chr2:215590370-215674407 NCBI Ensembl UCSC
GRCh38/hg38: chr2:214725646-214809683 NCBI Ensembl UCSC
MANE Select Transcript
NM_000465.4 ENST00000260947.9 (Read more about MANE Select)
Function
E3 ubiquitin-protein ligase. The BRCA1-BARD1 heterodimer specifically mediates the formation of 'Lys-6'-linked polyubiquitin chains and coordinates a diverse range of cellular pathways such as DNA damage repair, ubiquitination and transcriptional regulation to maintain genomic stability. Plays a central role in the control of the cell cycle in response to DNA damage. Acts by mediating ubiquitin E3 ligase activity that is required for its tumor suppressor function. Also forms a heterodimer with C... (Source: Uniprot)

Dosage Sensitivity Summary (Gene)

Dosage ID:
ISCA-33242
Curation Status:
Complete
Issue Type:
Dosage Curation - Gene
Haploinsufficiency:
Sufficient Evidence for Haploinsufficiency (3)
Triplosensitivity:
No Evidence for Triplosensitivity (0)
Last Evaluated:
05/01/2020

Haploinsufficiency (HI) Score Details

HI Score:
3
HI Evidence Strength:
Sufficient Evidence for Haploinsufficiency (Disclaimer)
HI Disease:
HI Evidence:
  • PUBMED: 20077502
    Brakeleer et al (2010) Mutation analysis of the entire coding region of BARD1 as well as the intron-exon boundaries . Study consisted of 196 high risk breast and/or ovarian cancer families, which included 151 "breast cancer only" and 45 that also included ovarian cancer. All high risk families were negative for BRCA1/2 alterations. Female patient diagnosed with breast cancer at 68, identified frameshift alteration (c.1935_1954dup, p.Glu652ValfsX69) originated from a duplication of twenty nucleotides in exon 10, creating a premature stop codon, predicted to result in the loss of the entire second functional BRCT domain. Co-segregation analysis showed the same alteration present in two affected sisters (breast cancer, diagnosed at ages 42 and 38) and NOT present in any unaffected family members tested (proband's brother and two daughters). Nonsense mediated decay was not observed in leukocytes from mutation carriers, suggesting truncated BARD1 protein might accumulate in breast epithelial cells.
  • PUBMED: 20842729
    Sabatier et al (2010) Single 36 year old female with basal breast cancer and a family history of breast cancer (mother, diagnosed at age 51), who tested negative for BRCA1/2 alterations. Tumor profiling using aCGH identified a somatic homozygous deletion of BARD1; confirmed germline heterozygous deletion. Tumor displayed a BRCA1-inactivation profile/BRCA1-mutated-like profile (both suggestive of a BRCA1-deficiency). Mother was unavailable for testing.
  • PUBMED: 21344236; 25994375
    Ratajska et al (2012) and Klonowska et al (2015) Two studies looking at Polish patients from families with breast (Br) and/or ovarian (Ov) cancer (109 and 817 patients, respectively) using DHPLC/bi-directional sequencing or MLPA/sequencing, respectively. Ratajska patients were negative for BRCA1/2 alterations, and Klonowska patients were BRCA negative for the the five most common BRCA1 alterations in the Polish population that accounts for >90% of all BRCA mutations. Ratajaska et al identified three novel BARD1 variants (c.1312-2A>G, c.1690C>T, c.1977A>G) that were absent/low frequency in controls. The first variant (c.1312-2A>G) was identified in proband (Br, 40), proband's affected mother (Br, 50), and proband's unaffected son (age unknown). The second variant (c.1690C>T, p.Gln564*) identified in proband (Br, 46) and proband's affected mother (Br, 75); same variant also identified by Klonowska et al in two additional families (Br/Ov and Br). The third variant (c.1977A>G, p.Arg659Arg; apparently silent alteration that affects several exonic splicing enhancer motifs, resulting in the deletion of exons 2-9, leading to a frameshift and the premature termination of translation, p.Cys53_Trp635delinsfs*12) identified in proband (Ov, 36) and affected maternal grandma (Br, 52) and affected maternal great aunt (genital tract ca, unknown); same variant also identified by Klonowska et al in three additional families (Br/Ov, Br/Ov, and Br).
HI Evidence Comments:
Haploinsufficiency/loss of function variants are presumed to result in increased risk for breast cancer.

Triplosensitivity (TS) Score Details

TS Score:
0
TS Evidence Strength:
No Evidence for Triplosensitivity (Disclaimer)
TS Evidence Comments:
no evidence for triplosensitivity

Genomic View

Select assembly: (NC_000002.11) (NC_000002.12)