rs1553645492

chr3-52405858-G-GT

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_004656.4(BAP1):c.837_838insA(p.Gln280ThrfsTer4) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. S279S) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: BAP1 NM_004656.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 1.70

Genes affected

BAP1 (HGNC:950): (BRCA1 associated protein 1) This gene belongs to the ubiquitin C-terminal hydrolase subfamily of deubiquitinating enzymes that are involved in the removal of ubiquitin from proteins. The encoded enzyme binds to the breast cancer type 1 susceptibility protein (BRCA1) via the RING finger domain of the latter and acts as a tumor suppressor. In addition, the enzyme may be involved in regulation of transcription, regulation of cell cycle and growth, response to DNA damage and chromatin dynamics. Germline mutations in this gene may be associated with tumor predisposition syndrome (TPDS), which involves increased risk of cancers including malignant mesothelioma, uveal melanoma and cutaneous melanoma. [provided by RefSeq, May 2013]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-52405858-G-GT is Pathogenic according to our data. Variant chr3-52405858-G-GT is described in ClinVar as [Pathogenic]. Clinvar id is 539922.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BAP1	NM_004656.4	c.837_838insA	p.Gln280ThrfsTer4	frameshift_variant	10/17	ENST00000460680.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BAP1	ENST00000460680.6	c.837_838insA	p.Gln280ThrfsTer4	frameshift_variant	10/17	1	NM_004656.4	P1
BAP1	ENST00000296288.9	c.783_784insA	p.Gln262ThrfsTer4	frameshift_variant	10/17	5
BAP1	ENST00000471532.5	n.1004_1005insA		non_coding_transcript_exon_variant	5/5	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

BAP1-related tumor predisposition syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Jan 02, 2018

This variant has not been reported in the literature in individuals with BAP1-related disease. For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in BAP1 are known to be pathogenic (PMID: 21874000, 23684012). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Gln280Thrfs*4) in the BAP1 gene. It is expected to result in an absent or disrupted protein product. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 27, 2021

The c.837dupA pathogenic mutation, located in coding exon 10 of the BAP1 gene, results from a duplication of A at nucleotide position 837, causing a translational frameshift with a predicted alternate stop codon (p.Q280Tfs*4). 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. -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1553645492; hg19: chr3-52439874;