Is BUB1B p.Ile666Phe (c.1996A>T) pathogenic?

BUB1B p.Ile666Phe (c.1996A>T) is classified Uncertain significance in BUB1B (ClinVar, Single submitter, 1 submitter; last evaluated 2022-03-01). AlphaMissense: likely benign (0.1182); No allele count reported in gnomAD v4.1 (AN 1,614,190); Associated with Inborn genetic diseases.

What condition is associated with BUB1B p.Ile666Phe (c.1996A>T)?

BUB1B p.Ile666Phe (c.1996A>T) is associated with Inborn genetic diseases (ClinVar).

How common is BUB1B p.Ile666Phe (c.1996A>T) in the general population?

BUB1B p.Ile666Phe (c.1996A>T) is no allele count reported in gnomAD v4.1 (AN 1,614,190) (gnomAD).

What do computational predictors say about BUB1B p.Ile666Phe (c.1996A>T)?

AlphaMissense predicts likely benign (score 0.1182) — an in-silico prediction, not a clinical call.

BUB1B p.Ile666Phe

c.1996A>T · rs1218957418 · VCV1784053

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1182 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,614,190)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.1182	likely benign
REVEL	0.028	moderately benign-leaning
SaProt	LLR -5.82	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 2	GERP 1.1, phastCons 0.061
Regional constraint	o/e 0.91	unconstrained · MANE · 60 kb · p 0.0024 · regional, not allelic
Overall
CADD	14.72	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,614,190). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: BUB1B
Protein: p.Ile666Phe
Coding: c.1996A>T
MANE Select: NM_001211
dbSNP: rs1218957418
Type: single nucleotide variant
Location: chr15:40206445 (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 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
BUB1B p.Ala285Glu 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-ile666phe (accessed [today's date]).

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