Is CPAP p.Arg445Lys (c.1334G>A) pathogenic?

CPAP p.Arg445Lys (c.1334G>A) is classified Uncertain significance in CPAP (ClinVar, Single submitter, 1 submitter; last evaluated 2022-06-19). AlphaMissense: likely benign (0.0831); Very rare (popmax 0.000254%, nfe).

How common is CPAP p.Arg445Lys (c.1334G>A) in the general population?

CPAP p.Arg445Lys (c.1334G>A) is very rare (popmax 0.000254%, nfe) (gnomAD).

What do computational predictors say about CPAP p.Arg445Lys (c.1334G>A)?

AlphaMissense predicts likely benign (score 0.0831) — an in-silico prediction, not a clinical call.

CPAP p.Arg445Lys

c.1334G>A · rs774388300 · VCV2049981

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0831 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000254%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0831	likely benign
REVEL	0.102	moderately benign-leaning
SaProt	LLR -5.57	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 0.69, phastCons 1
Regional constraint	o/e 0.96	unconstrained · MANE · 30 kb · p 0.11 · regional, not allelic
Overall
CADD	12.19	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 0.000254% European (non-Finnish) · 3/1,180,046 alleles

Filtering AF 6.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.9e-05%

Overall 0.000186% 3/1,614,090 alleles · very rare

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: CPAP
Protein: p.Arg445Lys
Coding: c.1334G>A
MANE Select: NM_018451
dbSNP: rs774388300
Type: single nucleotide variant
Location: chr13:24906704 (GRCh38)
Structure: AlphaFold pLDDT 56.70 · 6 PDB
Residue 445: the 'disordered' region

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

Similar variants

CPAP p.Arg445= Likely benign ★ same residue
CPAP c.2693-2A>G Likely pathogenic ★★ same type
CPAP p.Arg1298Gln Likely pathogenic ★★ same type
CPAP p.Arg378Ter Pathogenic ★★ same type
CPAP p.Arg566Ter Pathogenic/Likely pathogenic ★★ same type
CPAP p.Arg902Ter Pathogenic/Likely pathogenic ★★ same type
CPAP p.Arg958Ter Pathogenic/Likely pathogenic ★★ same type
CPAP p.Gln14Ter Pathogenic/Likely pathogenic ★★ 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/cpap-p-arg445lys (accessed [today's date]).

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