rs868339867

Positions:

• chr3-52406882-C-A
• chr3-52406882-C-G
• chr3-52406882-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP2 PP3_Moderate PP5

The NM_004656.4(BAP1):​c.606G>T​(p.Trp202Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: BAP1 NM_004656.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 7.87

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 Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), BAP1. . Gene score misZ 2.6442 (greater than the threshold 3.09). Trascript score misZ 3.2667 (greater than threshold 3.09). GenCC has associacion of gene with BAP1-related tumor predisposition syndrome, Kury-Isidor syndrome, renal cell carcinoma.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.925
• PP5: Variant 3-52406882-C-A is Pathogenic according to our data. Variant chr3-52406882-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 485293.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BAP1	NM_004656.4	c.606G>T	p.Trp202Cys	missense_variant	8/17	ENST00000460680.6	NP_004647.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BAP1	ENST00000460680.6	c.606G>T	p.Trp202Cys	missense_variant	8/17	1	NM_004656.4	ENSP00000417132	P1
BAP1	ENST00000296288.9	c.606G>T	p.Trp202Cys	missense_variant	8/17	5		ENSP00000296288
BAP1	ENST00000471532.5	n.321G>T		non_coding_transcript_exon_variant	4/5	5
BAP1	ENST00000483984.5	n.463G>T		non_coding_transcript_exon_variant	7/7	3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1418748 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 701586

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 06, 2022

The p.W202C variant (also known as c.606G>T), located in coding exon 8 of the BAP1 gene, results from a G to T substitution at nucleotide position 606. The tryptophan at codon 202 is replaced by cysteine, an amino acid with highly dissimilar properties. This amino acid change has been observed in multiple individuals with a personal and/or family history that is consistent with BAP1-related disease (Ambry internal data; Personal communication; De Rienzo A et al. Cancer Res. 2016 Jan;76(2):319-28). A close match alteration at this same codon (c.604T>C, p.W202R) has been observed in a family with BAP1-associated phenotype (Kittaneh M et al. J Transl Med 2018 Jul;16(1):194). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

BAP1-related tumor predisposition syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 09, 2020

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. This variant disrupts the p.Trp202 amino acid residue in BAP1. Other variant(s) that disrupt this residue have been observed in individuals with BAP1-related conditions (PMID: 30001711), which suggests that this may be a clinically significant amino acid residue. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has been observed in individual(s) with BAP1-related conditions (PMID: 26554828, Invitae). ClinVar contains an entry for this variant (Variation ID: 485293). This variant is not present in population databases (ExAC no frequency). This sequence change replaces tryptophan with cysteine at codon 202 of the BAP1 protein (p.Trp202Cys). The tryptophan residue is highly conserved and there is a large physicochemical difference between tryptophan and cysteine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	33
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.61	D;.
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.92	D;D
MetaSVM	Uncertain	0.22	D
MutationAssessor	Pathogenic	4.0	H;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-13	D;D
REVEL	Pathogenic	0.73
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.96
MutPred		0.74		Loss of catalytic residue at W202 (P = 0.038);Loss of catalytic residue at W202 (P = 0.038);
MVP		0.83
MPC		3.2
ClinPred		1.0	D
GERP RS		6.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.98
gMVP		1.0

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: rs868339867; hg19: chr3-52440898;