Is CCDC40 p.Leu778= (c.2332C>T) pathogenic?

CCDC40 p.Leu778= (c.2332C>T) is classified Conflicting classifications of pathogenicity in CCDC40 (ClinVar, Conflicting submitters, 4 submitters; last evaluated 2026-02-01). Ultra-rare (popmax 0.0384%, nfe); Associated with primary ciliary dyskinesia.

What condition is associated with CCDC40 p.Leu778= (c.2332C>T)?

CCDC40 p.Leu778= (c.2332C>T) is associated with primary ciliary dyskinesia, primary ciliary dyskinesia 15 (ClinVar).

How common is CCDC40 p.Leu778= (c.2332C>T) in the general population?

CCDC40 p.Leu778= (c.2332C>T) is ultra-rare (popmax 0.0384%, nfe) (gnomAD).

How is Primary ciliary dyskinesia inherited?

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

CCDC40 p.Leu778=

c.2332C>T · rs202075842 · VCV260959

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0384%, nfe)

Conditions

primary ciliary dyskinesia

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.5	GERP 1.4, phastCons 1
Overall
CADD	11.02	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0384% European (non-Finnish) · 453/1,180,010 alleles

Filtering AF 0.0354% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0343%

Overall 0.03% 485/1,614,154 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0384%	2,605
Finnishnot grpmax-eligible	0.0234%	4,269
Remaining individualsnot grpmax-eligible	0.0176%	5,683
African / African-American	0.00666%	15,012
Admixed American	0.00167%	60,030

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: CCDC40
Protein: p.Leu778=
Coding: c.2332C>T
MANE Select: NM_017950
dbSNP: rs202075842
Type: single nucleotide variant
Location: chr17:80086099 (GRCh38)
Gene constraint: LOEUF 0.962 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 71.70 · 1 PDB

Full CCDC40 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

Also linked: primary ciliary dyskinesia 15

For Primary ciliary dyskinesia (Orphanet):

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

Similar variants

CCDC40 c.1159+1G>A Likely pathogenic ★★ same condition
CCDC40 c.1989+1G>A Pathogenic/Likely pathogenic ★★ same condition
CCDC40 c.2712-1G>T Pathogenic/Likely pathogenic ★★ same condition
CCDC40 c.855+1G>A Pathogenic/Likely pathogenic ★★ same condition
CCDC40 c.940-1G>C Pathogenic/Likely pathogenic ★★ same condition
CCDC40 c.940-2A>G Pathogenic ★★ same condition
CCDC40 p.Arg1059Ter Pathogenic/Likely pathogenic ★★ same condition
CCDC40 p.Arg301Ter Pathogenic/Likely 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/ccdc40-p-leu778 (accessed [today's date]).

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