Is ABCA8 p.Trp1222Arg (c.3664T>C) pathogenic?

ABCA8 p.Trp1222Arg (c.3664T>C) is classified Uncertain significance in ABCA8 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-21). AlphaMissense: likely benign (0.205); Rare (popmax 0.117%, afr).

How common is ABCA8 p.Trp1222Arg (c.3664T>C) in the general population?

ABCA8 p.Trp1222Arg (c.3664T>C) is rare (popmax 0.117%, afr) (gnomAD).

What do computational predictors say about ABCA8 p.Trp1222Arg (c.3664T>C)?

AlphaMissense predicts likely benign (score 0.205) — an in-silico prediction, not a clinical call.

ABCA8 p.Trp1222Arg

c.3664T>C · rs145796352 · VCV2590409

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.205 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.117%, afr)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Computational evidence

Protein change
AlphaMissense	0.205	likely benign
REVEL	0.437	indeterminate
SaProt	LLR -5.71	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · A>C here scores Δ0.21 · evaluated, not missing
Constraint at this position
Conservation	phyloP -0.9	GERP -2
Regional constraint	o/e 1.01	unconstrained · MANE · 74 kb · p 0.82 · regional, not allelic
Overall
CADD	14.6	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — 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 0.117% African / African-American · 87/74,326 alleles

Filtering AF 0.0972% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0898%

Overall 0.00593% 95/1,601,092 alleles · rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.117%	854
Remaining individualsnot grpmax-eligible	0.00806%	12,406
Admixed American	0.00521%	19,179

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: ABCA8
Protein: p.Trp1222Arg
Coding: c.3664T>C
MANE Select: NM_001288985
dbSNP: rs145796352
Type: single nucleotide variant
Location: chr17:68883834 (GRCh38)
Gene constraint: LOEUF 1.086 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 78.67
Residue 1222: a UniProt-annotated variant site (loss of expression; loss of cholesterol efflux to apoa1)

Full ABCA8 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

ABCA8 p.Gly176Ser Uncertain significance ★★ ⚠ same type
ABCA8 c.4200-1G>C Benign ★★ same type
ABCA8 p.Gly1225Glu Benign ★★ same type
ABCA8 p.Ile542= Benign/Likely benign ★★ same type
ABCA8 p.Met251Ile Benign ★★ same type
ABCA8 c.3316-8G>T Uncertain significance ★ same type
ABCA8 p.Ala1109Val Uncertain significance ★ ⚠ same type
ABCA8 p.Ala1344Ser 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/abca8-p-trp1222arg (accessed [today's date]).

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