Is BUB1B p.Ile331Met (c.993A>G) pathogenic?

BUB1B p.Ile331Met (c.993A>G) is classified Likely benign in BUB1B (ClinVar, Single submitter, 1 submitter; last evaluated 2026-04-18). AlphaMissense: likely benign (0.0613); Absent from gnomAD v4.1; Associated with Inborn genetic diseases.

What condition is associated with BUB1B p.Ile331Met (c.993A>G)?

BUB1B p.Ile331Met (c.993A>G) is associated with Inborn genetic diseases (ClinVar).

How common is BUB1B p.Ile331Met (c.993A>G) in the general population?

BUB1B p.Ile331Met (c.993A>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about BUB1B p.Ile331Met (c.993A>G)?

AlphaMissense predicts likely benign (score 0.0613) — an in-silico prediction, not a clinical call.

BUB1B p.Ile331Met

c.993A>G · VCV4867996

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0613 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.0613	likely benign
REVEL	0.012	strongly benign-leaning
SaProt	LLR -5.90	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 -0.013	GERP -4.2
Regional constraint	o/e 0.91	unconstrained · MANE · 60 kb · p 0.0024 · regional, not allelic
Overall
CADD	1.131	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

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: BUB1B
Protein: p.Ile331Met
Coding: c.993A>G
MANE Select: NM_001211
Type: single nucleotide variant
Location: chr15:40185577 (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

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

BUB1B p.Ile331Thr Conflicting classifications of pathogenicity ★ ⚠ same residue
BUB1B c.35+4G>T Uncertain significance ★★ same condition
BUB1B p.Ala1017Thr Uncertain significance ★★ ⚠ same condition
BUB1B p.Ala1046Pro Uncertain significance ★★ ⚠ same condition
BUB1B p.Ala108Thr Uncertain significance ★★ ⚠ same condition
BUB1B p.Ala171Pro Uncertain significance ★★ ⚠ same condition
BUB1B p.Ala173Thr Uncertain significance ★★ ⚠ same condition
BUB1B p.Ala183Thr Uncertain significance ★★ ⚠ 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-ile331met (accessed [today's date]).

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