Is ABCA2 p.Gln877Arg (c.2630A>G) pathogenic?

ABCA2 p.Gln877Arg (c.2630A>G) is classified Uncertain significance in ABCA2 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-02-15). AlphaMissense: ambiguous (0.3608); Very rare (popmax 0.004%, afr).

How common is ABCA2 p.Gln877Arg (c.2630A>G) in the general population?

ABCA2 p.Gln877Arg (c.2630A>G) is very rare (popmax 0.004%, afr) (gnomAD).

What do computational predictors say about ABCA2 p.Gln877Arg (c.2630A>G)?

AlphaMissense predicts ambiguous (score 0.3608) — an in-silico prediction, not a clinical call.

ABCA2 p.Gln877Arg

c.2630A>G · rs568435680 · VCV2485152

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3608 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.004%, afr)

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense no call

Computational evidence

Protein change
AlphaMissense	0.3608	ambiguous
REVEL	0.834	moderately pathogenic-leaning
SaProt	LLR -8.19	tolerated
⇒ REVEL calls this damaging; SaProt does not; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.8	GERP 1.8, phastCons 1
Regional constraint	o/e 0.55	unconstrained · MANE · 1,228 bp · p 5.1e-17 · regional, not allelic
Overall
CADD	24.1	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM Q876R vs ClinVar Q877R) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.004% African / African-American · 3/75,034 alleles

Filtering AF 0.00106% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000494%

Overall 0.000186% 3/1,612,762 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: ABCA2
Protein: p.Gln877Arg
Coding: c.2630A>G
MANE Select: NM_001606
dbSNP: rs568435680
Type: single nucleotide variant
Location: chr9:137017048 (GRCh38)
Gene constraint: LOEUF 0.436 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 71.46
Residue 877: a UniProt-annotated variant site (in idpogsa)

Full ABCA2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

ABCA2 p.Gln1370Ter Likely pathogenic ★★ same type
ABCA2 c.3883-3C>T Uncertain significance ★★ same type
ABCA2 p.Ala1357Thr Uncertain significance ★★ ⚠ same type
ABCA2 p.Ala1620Thr Uncertain significance ★★ ⚠ same type
ABCA2 p.Ala1645Val Uncertain significance ★★ ⚠ same type
ABCA2 p.Ala1715Ser Uncertain significance ★★ ⚠ same type
ABCA2 p.Ala2180Thr Uncertain significance ★★ ⚠ same type
ABCA2 p.Ala2206Val 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/abca2-p-gln877arg (accessed [today's date]).

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