Is BAP1 p.Cys649= (c.1947C>T) pathogenic?

BAP1 p.Cys649= (c.1947C>T) is classified Conflicting classifications of pathogenicity in BAP1 (ClinVar, Conflicting submitters, 10 submitters; last evaluated 2025-12-31). Very rare (popmax 0.000508%, nfe); Associated with hereditary neoplastic syndrome.

What condition is associated with BAP1 p.Cys649= (c.1947C>T)?

BAP1 p.Cys649= (c.1947C>T) is associated with hereditary neoplastic syndrome, BAP1-related tumor predisposition syndrome (ClinVar).

How common is BAP1 p.Cys649= (c.1947C>T) in the general population?

BAP1 p.Cys649= (c.1947C>T) is very rare (popmax 0.000508%, nfe) (gnomAD).

BAP1 p.Cys649=

c.1947C>T · rs1041287605 · VCV508493

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 10 submitters

gnomAD v4.1

Rare

very rare (popmax 0.000508%, nfe)

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.13	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.7	GERP -2.8, phastCons 1
Overall
CADD	6.747	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000508% European (non-Finnish) · 6/1,180,042 alleles

Filtering AF 0.000183% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00012%

Overall 0.000372% 6/1,614,188 alleles · very rare exomes 6/1,461,890 · genomes 0/152,298 · joint denominator

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: BAP1
Protein: p.Cys649=
Coding: c.1947C>T
MANE Select: NM_004656
dbSNP: rs1041287605
Type: single nucleotide variant
Location: chr3:52402815 (GRCh38)
Gene constraint: LOEUF 0.324 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 63.87 · 4 PDB
Residue 649: an α-helix; a UniProt-annotated variant site (in tpds1); the 'interaction with brca1' region; the 'interaction with yy1' region

Full BAP1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: BAP1-related tumor predisposition syndrome

Similar variants

BAP1 p.Cys649Arg Uncertain significance ★ ⚠ same residue
BAP1 p.Cys649Tyr Conflicting classifications of pathogenicity ★ ⚠ same residue
BAP1 p.Cys649fs Likely pathogenic ★ same residue
BAP1 c.1117-1G>A Likely pathogenic ★★ same condition
BAP1 c.122+1G>A Pathogenic ★★ same condition
BAP1 c.122+1G>T Pathogenic/Likely pathogenic ★★ same condition
BAP1 c.122+5G>A Pathogenic/Likely pathogenic ★★ same condition
BAP1 c.122+5G>C Likely pathogenic ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/bap1-p-cys649 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown