2-214781110-T-G

Variant names:

• chr2-214781110-T-G
• rs138904906
• NM_000465.4:c.764A>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000465.4(BARD1):​c.764A>C​(p.Asn255Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000699 in 1,429,730 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N255S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: BARD1 NM_000465.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 0.904
• Publications: 4 publications found

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 Gene-Disease associations (from GenCC):

• breast cancer

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• hereditary breast carcinoma

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen
• familial ovarian cancer

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• hereditary nonpolyposis colon cancer

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.24001664).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000465.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BARD1	NM_000465.4	MANE Select	c.764A>C	p.Asn255Thr	missense	Exon 4 of 11	NP_000456.2
	BARD1	NM_001282543.2		c.707A>C	p.Asn236Thr	missense	Exon 3 of 10	NP_001269472.1
	BARD1	NR_104212.2		n.729A>C		non_coding_transcript_exon	Exon 3 of 10

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BARD1	ENST00000260947.9	TSL:1 MANE Select	c.764A>C	p.Asn255Thr	missense	Exon 4 of 11	ENSP00000260947.4
	BARD1	ENST00000617164.5	TSL:1	c.707A>C	p.Asn236Thr	missense	Exon 3 of 10	ENSP00000480470.1
	BARD1	ENST00000613706.5	TSL:1	c.764A>C	p.Asn255Thr	missense	Exon 4 of 11	ENSP00000484976.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.99e-7 AC: 1 AN: 1429730 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 708564

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 31828

American (AMR) AF: 0.00 AC: 0 AN: 38908

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24168

East Asian (EAS) AF: 0.00 AC: 0 AN: 39444

South Asian (SAS) AF: 0.00 AC: 0 AN: 79756

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52370

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5572

European-Non Finnish (NFE) AF: 9.10e-7 AC: 1 AN: 1098808

Other (OTH) AF: 0.00 AC: 0 AN: 58876

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Hereditary cancer-predisposing syndrome (2)
-	1	-	Familial cancer of breast (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.087
BayesDel_addAF	Benign	-0.073	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	17
DANN	Uncertain	0.99
DEOGEN2	Benign	0.17	T
Eigen	Benign	-0.11
Eigen_PC	Benign	-0.23
FATHMM_MKL	Benign	0.22	N
LIST_S2	Benign	0.79	T
M_CAP	Benign	0.053	D
MetaRNN	Benign	0.24	T
MetaSVM	Benign	-0.68	T
MutationAssessor	Uncertain	2.6	M
PhyloP100		0.90
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-2.1	N
REVEL	Benign	0.24
Sift	Benign	0.16	T
Sift4G	Uncertain	0.015	D
Polyphen		0.98	D
Vest4		0.41
MutPred		0.51		Gain of glycosylation at N255 (P = 0.0201)
MVP		0.90
MPC		0.14
ClinPred		0.67	D
GERP RS		3.4
Varity_R		0.11
gMVP		0.12
Mutation Taster		=85/15	polymorphism

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

Other links and lift over

dbSNP: rs138904906; hg19: chr2-215645834;