Is CCDC39 p.Arg103Pro (c.308G>C) pathogenic?

CCDC39 p.Arg103Pro (c.308G>C) is classified Uncertain significance in CCDC39 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-07-05). AlphaMissense: likely pathogenic (0.8692); Absent from gnomAD v4.1; Associated with primary ciliary dyskinesia.

What condition is associated with CCDC39 p.Arg103Pro (c.308G>C)?

CCDC39 p.Arg103Pro (c.308G>C) is associated with primary ciliary dyskinesia (ClinVar).

How common is CCDC39 p.Arg103Pro (c.308G>C) in the general population?

CCDC39 p.Arg103Pro (c.308G>C) 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.Arg103Pro (c.308G>C)?

AlphaMissense predicts likely pathogenic (score 0.8692) — an in-silico prediction, not a clinical call.

CCDC39 p.Arg103Pro

c.308G>C · rs766541691 · VCV242175

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.8692 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

primary ciliary dyskinesia

Computational evidence

Protein change
AlphaMissense	0.8692	likely pathogenic · top 3% in CCDC39
REVEL	0.433	indeterminate
SaProt	LLR -11.32	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.4	GERP -3.1, phastCons 0.025
Regional constraint	o/e 0.99	unconstrained · MANE · 64 kb · p 0.72 · regional, not allelic
Overall
CADD	18.33	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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.Arg103Pro
Coding: c.308G>C
MANE Select: NM_181426
dbSNP: rs766541691
Type: single nucleotide variant
Location: chr3:180661910 (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 p.Arg103Trp Uncertain significance ★★ ⚠ same residue
CCDC39 p.Arg103= Likely benign ★★ same residue
CCDC39 p.Arg103Gln Uncertain significance ★ ⚠ same residue
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

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-arg103pro (accessed [today's date]).

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