Is CFAP91 p.Ser33Phe (c.98C>T) pathogenic?

CFAP91 p.Ser33Phe (c.98C>T) is classified Uncertain significance in CFAP91 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-04-11). AlphaMissense: likely benign (0.1388); Ultra-rare (popmax 0.0151%, amr).

How common is CFAP91 p.Ser33Phe (c.98C>T) in the general population?

CFAP91 p.Ser33Phe (c.98C>T) is ultra-rare (popmax 0.0151%, amr) (gnomAD).

What do computational predictors say about CFAP91 p.Ser33Phe (c.98C>T)?

AlphaMissense predicts likely benign (score 0.1388) — an in-silico prediction, not a clinical call.

CFAP91 p.Ser33Phe

c.98C>T · rs138878198 · VCV3143729

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1388 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0151%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1388	likely benign
REVEL	0.06	moderately benign-leaning
SaProt	LLR -7.32	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 0.1	GERP -0.77
Regional constraint	o/e 1.02	unconstrained · MANE · 48 kb · p 0.55 · regional, not allelic
Overall
CADD	16.79	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 0.0151% Admixed American · 9/59,740 alleles

Filtering AF 0.00776% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00581%

Overall 0.00217% 35/1,611,798 alleles · ultra-rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0151%	6,638
Remaining individualsnot grpmax-eligible	0.0144%	6,932
African / African-American	0.0133%	7,504
European (non-Finnish)	0.000594%	168,429

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.Ser33Phe
Coding: c.98C>T
MANE Select: NM_033364
dbSNP: rs138878198
Type: single nucleotide variant
Location: chr3:119703196 (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.Ala256Thr 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

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-ser33phe (accessed [today's date]).

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