Is CFAP91 p.Ala256Thr (c.766G>A) pathogenic?

CFAP91 p.Ala256Thr (c.766G>A) is classified Uncertain significance in CFAP91 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-05-26). AlphaMissense: likely benign (0.0761); Ultra-rare (popmax 0.0167%, amr).

How common is CFAP91 p.Ala256Thr (c.766G>A) in the general population?

CFAP91 p.Ala256Thr (c.766G>A) is ultra-rare (popmax 0.0167%, amr) (gnomAD).

What do computational predictors say about CFAP91 p.Ala256Thr (c.766G>A)?

AlphaMissense predicts likely benign (score 0.0761) — an in-silico prediction, not a clinical call.

CFAP91 p.Ala256Thr

c.766G>A · VCV4001660

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0761 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0167%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0761	likely benign
REVEL	0.01	strongly benign-leaning
SaProt	LLR -9.04	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 -7.6	GERP -3.1
Regional constraint	o/e 1.02	unconstrained · MANE · 48 kb · p 0.55 · regional, not allelic
Overall
CADD	0.038	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 0.0167% Admixed American · 10/59,960 alleles

Filtering AF 0.009% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00682%

Overall 0.0026% 42/1,613,736 alleles · ultra-rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0167%	5,996
Remaining individualsnot grpmax-eligible	0.0128%	7,807
East Asian	0.00445%	22,447
African / African-American	0.00267%	37,456
European (non-Finnish)	0.0017%	58,995

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: CFAP91
Protein: p.Ala256Thr
Coding: c.766G>A
MANE Select: NM_033364
Type: single nucleotide variant
Location: chr3:119726254 (GRCh38)
Gene constraint: LOEUF 1.129 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 75.20 · 1 PDB

Full CFAP91 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CFAP91 c.359+1G>A Likely pathogenic ★ same type
CFAP91 p.Gln545Ter Likely pathogenic ★ same type
CFAP91 c.501-3T>C Uncertain significance ★ same type
CFAP91 p.Ala249Asp Uncertain significance ★ ⚠ same type
CFAP91 p.Ala449Val Uncertain significance ★ ⚠ same type
CFAP91 p.Ala598Ser Uncertain significance ★ ⚠ same type
CFAP91 p.Ala718Thr Uncertain significance ★ ⚠ same type
CFAP91 p.Arg102Trp 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/cfap91-p-ala256thr (accessed [today's date]).

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