Is APBB3 p.Trp102Cys (c.306G>T) pathogenic?

APBB3 p.Trp102Cys (c.306G>T) is classified Uncertain significance in APBB3 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-12-10). AlphaMissense: ambiguous (0.3881); Absent from gnomAD v4.1.

How common is APBB3 p.Trp102Cys (c.306G>T) in the general population?

APBB3 p.Trp102Cys (c.306G>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about APBB3 p.Trp102Cys (c.306G>T)?

AlphaMissense predicts ambiguous (score 0.3881) — an in-silico prediction, not a clinical call.

APBB3 p.Trp102Cys

c.306G>T · VCV3405645

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3881 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense no call

Computational evidence

Protein change
AlphaMissense	0.3881	ambiguous
REVEL	0.189	benign-leaning
SaProt	LLR -5.12	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 5.9	GERP 1.8, phastCons 1
Regional constraint	o/e 0.84	unconstrained · MANE · 3,819 bp · p 0.00036 · regional, not allelic
Overall
CADD	26.6	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: APBB3
Protein: p.Trp102Cys
Coding: c.306G>T
MANE Select: NM_133173
Type: single nucleotide variant
Location: chr5:140562708 (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-trp102cys (accessed [today's date]).

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