Is BAP1 p.Ala378Val (c.1133C>T) pathogenic?

BAP1 p.Ala378Val (c.1133C>T) is classified Uncertain significance in BAP1 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2025-07-07). AlphaMissense: ambiguous (0.4268); Very rare (popmax 0.00223%, eas); Associated with hereditary neoplastic syndrome.

What condition is associated with BAP1 p.Ala378Val (c.1133C>T)?

BAP1 p.Ala378Val (c.1133C>T) is associated with hereditary neoplastic syndrome, BAP1-related tumor predisposition syndrome (ClinVar).

How common is BAP1 p.Ala378Val (c.1133C>T) in the general population?

BAP1 p.Ala378Val (c.1133C>T) is very rare (popmax 0.00223%, eas) (gnomAD).

What do computational predictors say about BAP1 p.Ala378Val (c.1133C>T)?

AlphaMissense predicts ambiguous (score 0.4268) — an in-silico prediction, not a clinical call.

BAP1 p.Ala378Val

c.1133C>T · rs1466585782 · VCV818399

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

AlphaMissense

ambiguous

0.4268 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00223%, eas)

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.4268	ambiguous
REVEL	0.249	benign-leaning
SaProt	LLR -6.50	tolerated
⇒ REVEL and SaProt both call this tolerated; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.8, phastCons 1
Overall
CADD	29.7	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00223% East Asian · 1/44,890 alleles

Filtering AF 6.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.9e-05%

Overall 0.000496% 8/1,613,524 alleles · very rare

Ancestry group	Frequency	1 in
Finnishnot grpmax-eligible	0.00313%	31,948
East Asiangrpmax	0.00223%	44,890
Admixed American	0.00167%	59,922
African / African-American	0.00133%	74,918
European (non-Finnish)	0.000254%	393,297

Finnish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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.Ala378Val
Coding: c.1133C>T
MANE Select: NM_007212 · reported on NM_004656
dbSNP: rs1466585782
Type: single nucleotide variant
Location: chr3:52404570 (GRCh38)
Structure: AlphaFold pLDDT 78.27 · 28 PDB

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.Ala378Thr Uncertain significance ★★ ⚠ same residue
BAP1 p.Ala378= Likely benign ★ same residue
BAP1 p.Ala378Leu Uncertain significance ★★ 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-ala378val (accessed [today's date]).

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