Is BUB1 p.Val888Ala (c.2663T>C) pathogenic?

BUB1 p.Val888Ala (c.2663T>C) is classified Uncertain significance in BUB1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-08-15). AlphaMissense: ambiguous (0.3523); Very rare (popmax 8.48e-05%, nfe).

How common is BUB1 p.Val888Ala (c.2663T>C) in the general population?

BUB1 p.Val888Ala (c.2663T>C) is very rare (popmax 8.48e-05%, nfe) (gnomAD).

What do computational predictors say about BUB1 p.Val888Ala (c.2663T>C)?

AlphaMissense predicts ambiguous (score 0.3523) — an in-silico prediction, not a clinical call.

BUB1 p.Val888Ala

c.2663T>C · rs2467971236 · VCV2565816

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

ambiguous

0.3523 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.48e-05%, nfe)

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense no call

Computational evidence

Protein change
AlphaMissense	0.3523	ambiguous
REVEL	0.041	moderately benign-leaning
SaProt	LLR -5.59	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 7.1	phastCons 1
Regional constraint	o/e 0.90	unconstrained · MANE · 40 kb · p 0.00043 · regional, not allelic
Overall
CADD	22.8	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 8.48e-05% European (non-Finnish) · 1/1,179,924 alleles

Overall 6.84e-05% 1/1,461,324 alleles · very rare

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: BUB1
Protein: p.Val888Ala
Coding: c.2663T>C
MANE Select: NM_004336
dbSNP: rs2467971236
Type: single nucleotide variant
Location: chr2:110641427 (GRCh38)
Gene constraint: LOEUF 0.727 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 63.91 · 11 PDB
Residue 888: the protein kinase domain

Full BUB1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

BUB1 p.Val888Leu Uncertain significance ★ ⚠ same residue
BUB1 p.Val888Met Uncertain significance ★ ⚠ same residue
BUB1 c.1698+1G>T Uncertain significance ★★ same type
BUB1 p.Ala281Thr Uncertain significance ★★ ⚠ same type
BUB1 p.Ala283Thr Uncertain significance ★★ ⚠ same type
BUB1 p.Ala499Val Uncertain significance ★★ ⚠ same type
BUB1 p.Ala502Ser Uncertain significance ★★ ⚠ same type
BUB1 p.Ala630Gly Uncertain significance ★★ ⚠ same type

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/bub1-p-val888ala (accessed [today's date]).

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