Is ABCA4 p.Arg508Pro (c.1523G>C) pathogenic?

ABCA4 p.Arg508Pro (c.1523G>C) is classified Likely pathogenic in ABCA4 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-01-01). AlphaMissense: ambiguous (0.4232); Absent from gnomAD v4.1; Associated with inherited retinal dystrophy.

What condition is associated with ABCA4 p.Arg508Pro (c.1523G>C)?

ABCA4 p.Arg508Pro (c.1523G>C) is associated with inherited retinal dystrophy (ClinVar).

How common is ABCA4 p.Arg508Pro (c.1523G>C) in the general population?

ABCA4 p.Arg508Pro (c.1523G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ABCA4 p.Arg508Pro (c.1523G>C)?

AlphaMissense predicts ambiguous (score 0.4232) — an in-silico prediction, not a clinical call.

ABCA4 p.Arg508Pro

c.1523G>C · VCV3249758

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4232 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

inherited retinal dystrophy

Computational evidence

Protein change
AlphaMissense	0.4232	ambiguous
REVEL	0.612	indeterminate
SaProt	LLR -9.54	tolerated
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -2.7	GERP -1.4
Regional constraint	o/e 0.98	unconstrained · MANE · 128 kb · p 0.24 · regional, not allelic
Overall
CADD	14.64	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: ABCA4
Protein: p.Arg508Pro
Coding: c.1523G>C
MANE Select: NM_000350
Type: single nucleotide variant
Location: chr1:94077721 (GRCh38)
Gene constraint: LOEUF 0.786 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 75.96 · 8 PDB
Residue 508: a UniProt-annotated variant site (in cord3; uncertain significance); a UniProt-annotated variant site (in stgd1; uncertain significance); a UniProt-annotated variant site (found in a patient with chorioretinal atrophy; uncertain significance); an α-helix

Full ABCA4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

inherited retinal dystrophy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

ABCA4 p.Arg508Cys Conflicting classifications of pathogenicity ★ ⚠ same residue
ABCA4 p.Arg508His Uncertain significance ★★ ⚠ same residue
ABCA4 p.Arg508= Likely benign ★ same residue
ABCA4 c.1937+1G>A Pathogenic ★★★ same condition
ABCA4 c.4253+43G>A Pathogenic ★★★ same condition
ABCA4 c.4254-1G>C Pathogenic ★★★ same condition
ABCA4 c.4352+1G>A Pathogenic ★★★ same condition
ABCA4 c.4773+3A>G Pathogenic ★★★ 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/abca4-p-arg508pro (accessed [today's date]).

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