Is ABCA4 p.Val552Ala (c.1655T>C) pathogenic?

ABCA4 p.Val552Ala (c.1655T>C) is classified Uncertain significance in ABCA4 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2021-08-28). AlphaMissense: ambiguous (0.4994); Very rare (popmax 0.00161%, nfe).

How common is ABCA4 p.Val552Ala (c.1655T>C) in the general population?

ABCA4 p.Val552Ala (c.1655T>C) is very rare (popmax 0.00161%, nfe) (gnomAD).

What do computational predictors say about ABCA4 p.Val552Ala (c.1655T>C)?

AlphaMissense predicts ambiguous (score 0.4994) — an in-silico prediction, not a clinical call.

ABCA4 p.Val552Ala

c.1655T>C · rs141864243 · VCV934597

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

ambiguous

0.4994 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00161%, nfe)

Missense predictors

2/2 damaging

REVEL, SaProt · AlphaMissense no call

Computational evidence

Protein change
AlphaMissense	0.4994	ambiguous
REVEL	0.839	moderately pathogenic-leaning
SaProt	LLR -12.01	damaging
⇒ REVEL and SaProt both call this damaging; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 9.4	GERP 2, phastCons 1
Regional constraint	o/e 0.98	unconstrained · MANE · 128 kb · p 0.24 · regional, not allelic
Overall
CADD	22.5	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 0.00161% European (non-Finnish) · 19/1,179,972 alleles

Filtering AF 0.00103% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00083%

Overall 0.0013% 19/1,461,830 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: ABCA4
Protein: p.Val552Ala
Coding: c.1655T>C
MANE Select: NM_000350
dbSNP: rs141864243
Type: single nucleotide variant
Location: chr1:94063217 (GRCh38)
Gene constraint: LOEUF 0.786 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 75.96 · 8 PDB
Residue 552: 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); a UniProt-annotated variant site (in rp19; benign; no effect on n-all-trans-retinylidenephosphatidylethanolamine binding; does not affect solubility; does not affect intracellular vesicle localization; does not affect basal and n-ret-pe-stimulated atpase activity); a β-strand

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

Similar variants

ABCA4 p.Val552Ile Likely benign ★★★ ⚠ same residue
ABCA4 c.1937+1G>A Pathogenic ★★★ same type
ABCA4 c.3328+2T>A Pathogenic ★★★ same type
ABCA4 c.3523-1G>A Pathogenic ★★★ same type
ABCA4 c.4253+43G>A Pathogenic ★★★ same type
ABCA4 c.4254-1G>C Pathogenic ★★★ same type
ABCA4 c.4352+1G>A Pathogenic ★★★ same type
ABCA4 c.4773+3A>G Pathogenic ★★★ 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/abca4-p-val552ala (accessed [today's date]).

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