Is CCDC40 p.Ser17= (c.51G>A) pathogenic?

CCDC40 p.Ser17= (c.51G>A) is classified Benign/Likely benign in CCDC40 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2026-01-06). Rare (popmax 0.227%, afr); Associated with primary ciliary dyskinesia.

What condition is associated with CCDC40 p.Ser17= (c.51G>A)?

CCDC40 p.Ser17= (c.51G>A) is associated with primary ciliary dyskinesia (ClinVar).

How common is CCDC40 p.Ser17= (c.51G>A) in the general population?

CCDC40 p.Ser17= (c.51G>A) is rare (popmax 0.227%, afr) (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.Ser17=

c.51G>A · rs141650385 · VCV226495

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

rare (popmax 0.227%, afr)

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
Pangolin	Δ0.23	loss · gain 0.00 · not in the SpliceAI release · independent
Constraint at this position
Conservation	phyloP -2.5	GERP -3.8
Overall
CADD	0.423	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.227% African / African-American · 170/74,964 alleles

Filtering AF 0.199% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.188%

Overall 0.0135% 218/1,611,100 alleles · rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.227%	441
Remaining individualsnot grpmax-eligible	0.0192%	5,198
Admixed American	0.0133%	7,493
South Asian	0.00989%	10,108
European (non-Finnish)	0.00161%	61,979

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.Ser17=
Coding: c.51G>A
MANE Select: NM_017950
dbSNP: rs141650385
Type: single nucleotide variant
Location: chr17:80038144 (GRCh38)
Gene constraint: LOEUF 0.962 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 71.70 · 1 PDB
Residue 17: the 'disordered' region

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

For Primary ciliary dyskinesia (Orphanet):

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

Similar variants

CCDC40 p.Ser17Trp Uncertain significance ★ ⚠ same residue
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-ser17 (accessed [today's date]).

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