Is AFAP1 p.Arg650Gln (c.1949G>A) pathogenic?

AFAP1 p.Arg650Gln (c.1949G>A) is classified Uncertain significance in AFAP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-04-08). AlphaMissense: likely benign (0.0917); Very rare (popmax 0.00446%, eas).

How common is AFAP1 p.Arg650Gln (c.1949G>A) in the general population?

AFAP1 p.Arg650Gln (c.1949G>A) is very rare (popmax 0.00446%, eas) (gnomAD).

What do computational predictors say about AFAP1 p.Arg650Gln (c.1949G>A)?

AlphaMissense predicts likely benign (score 0.0917) — an in-silico prediction, not a clinical call.

AFAP1 p.Arg650Gln

c.1949G>A · VCV4020995

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0917 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00446%, eas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0917	likely benign
REVEL	0.11	moderately benign-leaning
SaProt	LLR -6.57	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.3	GERP 0.83, phastCons 1
Regional constraint	o/e 1.14	unconstrained · MANE · 108 kb · p 3.6e-06 · regional, not allelic
Overall
CADD	19.13	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.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM R566Q vs ClinVar R650Q) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00446% East Asian · 2/44,884 alleles

Filtering AF 0.000739% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000276%

Overall 0.00031% 5/1,614,054 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00446%	22,442
Admixed American	0.00167%	60,008
South Asian	0.0011%	91,088
European (non-Finnish)	8.47e-05%	1,180,048

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: AFAP1
Protein: p.Arg650Gln
Coding: c.1949G>A
MANE Select: NM_001134647
Type: single nucleotide variant
Location: chr4:7774852 (GRCh38)
Gene constraint: LOEUF 0.918 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 67.09

Full AFAP1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

AFAP1 p.Val288Ala Uncertain significance ★★ ⚠ same type
AFAP1 p.Ala783= Likely benign ★★ same type
AFAP1 p.Asn686= Likely benign ★★ same type
AFAP1 p.Glu705= Benign ★★ same type
AFAP1 p.Ala438Ser Uncertain significance ★ ⚠ same type
AFAP1 p.Ala534Ser Uncertain significance ★ same type
AFAP1 p.Ala587Val Uncertain significance ★ same type
AFAP1 p.Ala624Val 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/afap1-p-arg650gln (accessed [today's date]).

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