rs548946316

chr3-52407306-G-Achr3-52407306-G-Cchr3-52407306-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PP2 PP3

The NM_004656.4(BAP1):c.448C>T(p.Arg150Cys) variant causes a missense change. The variant allele was found at a frequency of 0.0000144 in 1,461,884 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. R150H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000014 (0 hom.)
• Consequence: BAP1 NM_004656.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:4
• Conservation: PhyloP100: 5.16

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 Uncertain_significance. Variant got 2 ACMG points.

• PP2: Missense variant where missense usually causes diseases, BAP1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.754

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BAP1	NM_004656.4	c.448C>T	p.Arg150Cys	missense_variant	7/17	ENST00000460680.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BAP1	ENST00000460680.6	c.448C>T	p.Arg150Cys	missense_variant	7/17	1	NM_004656.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000144 AC: 21 AN: 1461884 Hom.: 0 Cov.: 32 AF XY: 0.0000124 AC XY: 9 AN XY: 727242

Gnomad4 AFR exome AF: 0.0000597

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: 0.0000171

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Jun 19, 2019	The p.R150C variant (also known as c.448C>T), located in coding exon 7 of the BAP1 gene, results from a C to T substitution at nucleotide position 448. The arginine at codon 150 is replaced by cysteine, an amino acid with highly dissimilar properties. In a study of 1109 probands with cutaneous melanoma, a patient, with cutaneous melanoma at ages 32 and 57 and breast cancer at age 57 , was found to have this variant. This patient did not have a reported family history of cancer (Aoude LG et al. Twin Res Hum Genet. 2015 Apr;18:126-33). In another study, this variant was identified in 1/1977 melanoma cases and 0/754 controls (O'Shea SJ et al. Hum. Mol. Genet. 2017 02;26:717-728). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -
Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Feb 26, 2021	This missense variant replaces arginine with cysteine at codon 150 of the BAP1 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with melanoma (PMID: 25787093, 28062663). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

BAP1-related tumor predisposition syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 05, 2024

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 150 of the BAP1 protein (p.Arg150Cys). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with both cutaneous malignant melanoma and breast cancer and melanoma (PMID: 25787093, 28062663). ClinVar contains an entry for this variant (Variation ID: 240059). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt BAP1 protein function with a positive predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Nov 20, 2020

Not observed in large population cohorts (Lek et al., 2016) In silico analysis supports that this missense variant has a deleterious effect on protein structure/function This variant is associated with the following publications: (PMID: 26683624, 28793149, 25787093, 28062663) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
Cadd	Pathogenic	29
Dann	Uncertain	1.0
DEOGEN2	Benign	0.25	T;.;T
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D
M_CAP	Benign	0.015	T
MetaRNN	Pathogenic	0.75	D;D;D
MetaSVM	Benign	-0.96	T
MutationAssessor	Uncertain	2.4	M;.;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.88	D
PROVEAN	Pathogenic	-5.0	D;D;D
REVEL	Uncertain	0.30
Sift	Benign	0.049	D;D;T
Sift4G	Uncertain	0.0070	D;D;.
Polyphen		0.89	P;.;.
Vest4		0.65
MutPred		0.52		Loss of solvent accessibility (P = 3e-04);Loss of solvent accessibility (P = 3e-04);.;
MVP		0.71
MPC		2.9
ClinPred		0.98	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.35
gMVP		0.84

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: rs548946316; hg19: chr3-52441322;