Is CCDC39 p.Thr302Ala (c.904A>G) pathogenic?

CCDC39 p.Thr302Ala (c.904A>G) is classified Uncertain significance in CCDC39 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-08-15). AlphaMissense: likely benign (0.0674); Absent from gnomAD v4.1; Associated with primary ciliary dyskinesia.

What condition is associated with CCDC39 p.Thr302Ala (c.904A>G)?

CCDC39 p.Thr302Ala (c.904A>G) is associated with primary ciliary dyskinesia (ClinVar).

How common is CCDC39 p.Thr302Ala (c.904A>G) in the general population?

CCDC39 p.Thr302Ala (c.904A>G) is absent from gnomAD v4.1 (gnomAD).

How is Primary ciliary dyskinesia inherited?

Typically Autosomal dominant, Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about CCDC39 p.Thr302Ala (c.904A>G)?

AlphaMissense predicts likely benign (score 0.0674) — an in-silico prediction, not a clinical call.

CCDC39 p.Thr302Ala

c.904A>G · rs1711543464 · VCV961209

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0674 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

primary ciliary dyskinesia

Computational evidence

Protein change
AlphaMissense	0.0674	likely benign
REVEL	0.206	benign-leaning
SaProt	LLR -6.59	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 -5.5	GERP -4.1
Regional constraint	o/e 0.99	unconstrained · MANE · 64 kb · p 0.72 · regional, not allelic
Overall
CADD	0.002	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

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: CCDC39
Protein: p.Thr302Ala
Coding: c.904A>G
MANE Select: NM_181426
dbSNP: rs1711543464
Type: single nucleotide variant
Location: chr3:180654788 (GRCh38)
Gene constraint: LOEUF 1.226 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 79.23 · 1 PDB

Full CCDC39 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

primary ciliary dyskinesia — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Primary ciliary dyskinesia (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, X-linked recessive
Onset: Neonatal
Prevalence: 1-5 / 10 000 (Pakistan)

Similar variants

CCDC39 c.1034+2T>A Pathogenic/Likely pathogenic ★★ same condition
CCDC39 c.1167+1261A>G Pathogenic/Likely pathogenic ★★ same condition
CCDC39 c.1362+1G>A Likely pathogenic ★★ same condition
CCDC39 c.1999-2A>T Pathogenic/Likely pathogenic ★★ same condition
CCDC39 c.210+2T>C Pathogenic ★★ same condition
CCDC39 c.357+1G>C Pathogenic ★★ same condition
CCDC39 c.516+1G>A Likely pathogenic ★★ same condition
CCDC39 c.610-2A>G Pathogenic ★★ same condition

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/ccdc39-p-thr302ala (accessed [today's date]).

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