Is CFAP74 p.Arg341Cys (c.1021C>T) pathogenic?

CFAP74 p.Arg341Cys (c.1021C>T) is classified Uncertain significance in CFAP74 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-11-11). AlphaMissense: likely benign (0.0936); Ultra-rare (popmax 0.0302%, amr).

How common is CFAP74 p.Arg341Cys (c.1021C>T) in the general population?

CFAP74 p.Arg341Cys (c.1021C>T) is ultra-rare (popmax 0.0302%, amr) (gnomAD).

What do computational predictors say about CFAP74 p.Arg341Cys (c.1021C>T)?

AlphaMissense predicts likely benign (score 0.0936) — an in-silico prediction, not a clinical call.

CFAP74 p.Arg341Cys

c.1021C>T · VCV3491440

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0936 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0302%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0936	likely benign
REVEL	0.018	moderately benign-leaning
SaProt	LLR -7.74	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 1.4	GERP -1.3, phastCons 0.002
Regional constraint	o/e 1.02	unconstrained · MANE · 69 kb · p 0.48 · regional, not allelic
Overall
CADD	14.07	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 0.0302% Admixed American · 18/59,570 alleles

Filtering AF 0.0195% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0161%

Overall 0.00527% 85/1,611,958 alleles · ultra-rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0302%	3,309
Remaining individualsnot grpmax-eligible	0.0144%	6,936
South Asian	0.0143%	6,970
African / African-American	0.00666%	15,008
East Asian	0.00446%	22,406
European (non-Finnish)	0.00314%	31,869
Finnishnot grpmax-eligible	0.00157%	63,844

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: CFAP74
Protein: p.Arg341Cys
Coding: c.1021C>T
MANE Select: NM_001304360
Type: single nucleotide variant
Location: chr1:1970684 (GRCh38)
Gene constraint: LOEUF 0.799 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 69.38

Full CFAP74 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CFAP74 p.Arg341Pro Uncertain significance ★ ⚠ same residue
CFAP74 p.Lys394Met Uncertain significance ★★ ⚠ same type
CFAP74 p.Arg365Gln Likely benign ★★ same type
CFAP74 p.Gly5Ser Likely benign ★★ same type
CFAP74 p.Arg280Ter Likely pathogenic ★ same type
CFAP74 c.1851+2T>C Uncertain significance ★ same type
CFAP74 c.2176+30T>G Uncertain significance ★ same type
CFAP74 c.2176+34C>T 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/cfap74-p-arg341cys (accessed [today's date]).

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