Is CCDC39 c.357+8T>C pathogenic?

CCDC39 c.357+8T>C is classified Likely benign in CCDC39 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-12-28). Ultra-rare (popmax 0.0168%, amr); Associated with primary ciliary dyskinesia.

What condition is associated with CCDC39 c.357+8T>C?

CCDC39 c.357+8T>C is associated with primary ciliary dyskinesia (ClinVar).

How common is CCDC39 c.357+8T>C in the general population?

CCDC39 c.357+8T>C is ultra-rare (popmax 0.0168%, amr) (gnomAD).

How is Primary ciliary dyskinesia inherited?

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

CCDC39 c.357+8T>C

rs374226135 · VCV262973

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0168%, amr)

Conditions

primary ciliary dyskinesia

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
Splice region	donor +8	near-intronic (+8 nt from the splice site)
SpliceAI	<0.2	all four deltas below 0.2 · A>C here scores Δ0.96 · evaluated, not missing
Constraint at this position
Conservation	phyloP 0.54	GERP -3.2
Non-coding constraint	Z 1.64	1 kb window · o/e 0.88 · regional · uncalibrated
Overall
CADD	8.214	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0168% Admixed American · 9/53,648 alleles

Filtering AF 0.0136% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0128%

Overall 0.0128% 201/1,572,300 alleles · ultra-rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0168%	5,961
European (non-Finnish)	0.0155%	6,462
Remaining individualsnot grpmax-eligible	0.0147%	6,781
African / African-American	0.00405%	24,711
Ashkenazi Jewishnot grpmax-eligible	0.00346%	28,920

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: CCDC39
Coding: c.357+8T>C
MANE Select: NM_181426
dbSNP: rs374226135
Type: single nucleotide variant
Location: chr3:180661853 (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-c-357-plus-8t-c (accessed [today's date]).

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