Is APBB3 p.Arg477Trp (c.1429C>T) pathogenic?

APBB3 p.Arg477Trp (c.1429C>T) is classified Uncertain significance in APBB3 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-06-03). AlphaMissense: likely benign (0.2325); Very rare (popmax 0.00801%, afr).

How common is APBB3 p.Arg477Trp (c.1429C>T) in the general population?

APBB3 p.Arg477Trp (c.1429C>T) is very rare (popmax 0.00801%, afr) (gnomAD).

What do computational predictors say about APBB3 p.Arg477Trp (c.1429C>T)?

AlphaMissense predicts likely benign (score 0.2325) — an in-silico prediction, not a clinical call.

APBB3 p.Arg477Trp

c.1429C>T · VCV3301757

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2325 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00801%, afr)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Computational evidence

Protein change
AlphaMissense	0.2325	likely benign
REVEL	0.409	indeterminate
SaProt	LLR -9.81	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.1	GERP 0.84, phastCons 1
Regional constraint	o/e 1.04	unconstrained · MANE · 1,790 bp · p 0.64 · regional, not allelic
Overall
CADD	26.5	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

Grpmax group 0.00801% African / African-American · 6/74,916 alleles

Filtering AF 0.00359% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00255%

Overall 0.00142% 23/1,614,036 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00801%	12,486
South Asian	0.00769%	13,012
East Asian	0.00446%	22,443
Admixed American	0.00167%	59,986
Remaining individualsnot grpmax-eligible	0.0016%	62,488
European (non-Finnish)	0.000508%	196,672

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: APBB3
Protein: p.Arg477Trp
Coding: c.1429C>T
MANE Select: NM_133173
Type: single nucleotide variant
Location: chr5:140558617 (GRCh38)
Gene constraint: LOEUF 0.973 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 64.76 · 2 PDB

Full APBB3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

APBB3 p.Ala135Gly Uncertain significance ★ ⚠ same type
APBB3 p.Ala151Val Uncertain significance ★ ⚠ same type
APBB3 p.Ala163Thr Uncertain significance ★ ⚠ same type
APBB3 p.Ala288Thr Uncertain significance ★ ⚠ same type
APBB3 p.Ala313Val Uncertain significance ★ ⚠ same type
APBB3 p.Ala475Asp Uncertain significance ★ ⚠ same type
APBB3 p.Arg122Cys Uncertain significance ★ ⚠ same type
APBB3 p.Arg154Cys 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/apbb3-p-arg477trp (accessed [today's date]).

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