Is APBB1 p.Arg607Cys (c.1819C>T) pathogenic?

APBB1 p.Arg607Cys (c.1819C>T) is classified Uncertain significance in APBB1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-12-27). AlphaMissense: likely pathogenic (0.9899); Very rare (popmax 8.48e-05%, nfe).

How common is APBB1 p.Arg607Cys (c.1819C>T) in the general population?

APBB1 p.Arg607Cys (c.1819C>T) is very rare (popmax 8.48e-05%, nfe) (gnomAD).

What do computational predictors say about APBB1 p.Arg607Cys (c.1819C>T)?

AlphaMissense predicts likely pathogenic (score 0.9899) — an in-silico prediction, not a clinical call.

APBB1 p.Arg607Cys

c.1819C>T · rs750182977 · VCV3127666

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9899 · ACMG-weighted

gnomAD v4.1

Rare

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

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.9899	likely pathogenic · top 9% in APBB1
REVEL	0.725	pathogenic-leaning
SaProt	LLR -13.89	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.8, phastCons 1
Regional constraint	o/e 0.35	constrained · MANE · 251 bp · p 3.1e-06 · regional, not allelic
Overall
CADD	33.0	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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 8.48e-05% European (non-Finnish) · 1/1,179,758 alleles

Overall 6.84e-05% 1/1,461,296 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: APBB1
Protein: p.Arg607Cys
Coding: c.1819C>T
MANE Select: NM_001164
dbSNP: rs750182977
Type: single nucleotide variant
Location: chr11:6395932 (GRCh38)
Gene constraint: LOEUF 0.401 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 60.75 · 11 PDB
Residue 607: the pid 2 domain; an α-helix

Full APBB1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

SMPD1 p.Arg498Leu Pathogenic ★★ same type
APBB1 p.Ala371= Benign ★★ same type
APBB1 p.Arg51Cys Benign ★★ ⚠ same type
APBB1 p.Asn126= Benign ★★ same type
APBB1 p.Leu385= Benign ★★ same type
APBB1 p.Met327Val Likely benign ★★ same type
APBB1 c.721+1G>T Uncertain significance ★ same type
APBB1 p.Ala157Val 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/apbb1-p-arg607cys (accessed [today's date]).

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