Is BUB1B p.Ile331Thr (c.992T>C) pathogenic?

BUB1B p.Ile331Thr (c.992T>C) is classified Conflicting classifications of pathogenicity in BUB1B (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2023-10-22). AlphaMissense: likely benign (0.0538); Very rare (popmax 0.000508%, nfe); Associated with ovarian cancer.

What condition is associated with BUB1B p.Ile331Thr (c.992T>C)?

BUB1B p.Ile331Thr (c.992T>C) is associated with ovarian cancer, mosaic variegated aneuploidy syndrome 1 (ClinVar).

How common is BUB1B p.Ile331Thr (c.992T>C) in the general population?

BUB1B p.Ile331Thr (c.992T>C) is very rare (popmax 0.000508%, nfe) (gnomAD).

What do computational predictors say about BUB1B p.Ile331Thr (c.992T>C)?

AlphaMissense predicts likely benign (score 0.0538) — an in-silico prediction, not a clinical call.

BUB1B p.Ile331Thr

c.992T>C · rs971891189 · VCV1768645

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.0538 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000508%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

ovarian cancer

Computational evidence

Protein change
AlphaMissense	0.0538	likely benign
REVEL	0.114	moderately benign-leaning
SaProt	LLR -4.39	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.7	GERP 1.3, phastCons 0.003
Regional constraint	o/e 0.91	unconstrained · MANE · 60 kb · p 0.0024 · regional, not allelic
Overall
CADD	4.564	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 0.000508% European (non-Finnish) · 6/1,179,996 alleles

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

Overall 0.000372% 6/1,614,072 alleles · very rare exomes 5/1,461,828 · genomes 1/152,244 · 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: BUB1B
Protein: p.Ile331Thr
Coding: c.992T>C
MANE Select: NM_001211
dbSNP: rs971891189
Type: single nucleotide variant
Location: chr15:40185576 (GRCh38)
Gene constraint: LOEUF 0.707 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 64.62 · 9 PDB

Full BUB1B gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

ovarian cancer — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: mosaic variegated aneuploidy syndrome 1

Similar variants

BUB1B p.Ile331Met Likely benign ★ same residue
BUB1B p.Arg114Ter Pathogenic ★★ same condition
BUB1B p.Arg120Ter Pathogenic ★★ same condition
BUB1B p.Arg194Ter Pathogenic/Likely pathogenic ★★ same condition
BUB1B p.Arg199Ter Pathogenic/Likely pathogenic ★★ same condition
BUB1B p.Arg67Ter Pathogenic/Likely pathogenic ★★ same condition
BUB1B p.Gln267Ter Pathogenic ★★ same condition
BUB1B p.Leu737Ter Pathogenic/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/bub1b-p-ile331thr (accessed [today's date]).

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