Is CCDC13 p.Arg74Trp (c.220A>T) pathogenic?

CCDC13 p.Arg74Trp (c.220A>T) is classified Uncertain significance in CCDC13 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-09-26). AlphaMissense: likely benign (0.1441); Absent from gnomAD v4.1.

How common is CCDC13 p.Arg74Trp (c.220A>T) in the general population?

CCDC13 p.Arg74Trp (c.220A>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CCDC13 p.Arg74Trp (c.220A>T)?

AlphaMissense predicts likely benign (score 0.1441) — an in-silico prediction, not a clinical call.

CCDC13 p.Arg74Trp

c.220A>T · VCV3485976

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1441 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1441	likely benign
REVEL	0.145	moderately benign-leaning
SaProt	LLR -10.44	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Pangolin	Δ0.20	loss · gain 0.02 · not in the SpliceAI release · independent
Constraint at this position
Conservation	phyloP 3.2	GERP -0.74, phastCons 1
Regional constraint	o/e 0.94	unconstrained · MANE · 49 kb · p 0.094 · regional, not allelic
Overall
CADD	29.2	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CCDC13
Protein: p.Arg74Trp
Coding: c.220A>T
MANE Select: NM_144719
Type: single nucleotide variant
Location: chr3:42758126 (GRCh38)
Gene constraint: LOEUF 0.906 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 76.77

Full CCDC13 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CCDC13 p.Glu565Lys Uncertain significance ★★ ⚠ same type
CCDC13 p.Ala129Thr Uncertain significance ★ ⚠ same type
CCDC13 p.Ala175Thr Uncertain significance ★ ⚠ same type
CCDC13 p.Ala187Thr Uncertain significance ★ ⚠ same type
CCDC13 p.Ala332Gly Uncertain significance ★ ⚠ same type
CCDC13 p.Ala3Val Uncertain significance ★ ⚠ same type
CCDC13 p.Ala517Val Uncertain significance ★ ⚠ same type
CCDC13 p.Ala544Thr 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/ccdc13-p-arg74trp (accessed [today's date]).

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