Is CCDC40 p.Lys956= (c.2868G>A) pathogenic?

CCDC40 p.Lys956= (c.2868G>A) is classified Benign/Likely benign in CCDC40 (ClinVar, Multiple submitters, 9 submitters; last evaluated 2026-02-01). Common (popmax 13.8%, eas) — too common for a highly-penetrant pathogenic allele; Associated with primary ciliary dyskinesia.

What condition is associated with CCDC40 p.Lys956= (c.2868G>A)?

CCDC40 p.Lys956= (c.2868G>A) is associated with primary ciliary dyskinesia, primary ciliary dyskinesia 15 (ClinVar).

How is Primary ciliary dyskinesia inherited?

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

CCDC40 p.Lys956=

Q: How common is CCDC40 p.Lys956= (c.2868G>A) in the general population?

CCDC40 p.Lys956= (c.2868G>A) is common (popmax 13.8%, eas) — too common for a highly-penetrant pathogenic allele (gnomAD).

c.2868G>A · rs1982243 · VCV226492

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 9 submitters

gnomAD v4.1

Common

common (popmax 13.8%, eas) — too common for a highly-penetrant pathogenic allele

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 3.6	GERP 1.4, phastCons 1
Overall
CADD	9.055	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 13.8% East Asian · 6,193/44,892 alleles

Filtering AF 13.5% ClinGen BA1/BS1 input FAF95, joint · FAF99 13.4%

Overall 3.05% 49,303/1,614,018 alleles · common

Ancestry group	Frequency	1 in
East Asiangrpmax	13.8%	7
South Asian	5.05%	20
Finnishnot grpmax-eligible	4.14%	24
Remaining individualsnot grpmax-eligible	3.77%	27
Middle Eastern	3.28%	30
Ashkenazi Jewishnot grpmax-eligible	3.06%	33
European (non-Finnish)	2.5%	40
African / African-American	2.14%	47
Admixed American	2.09%	48
Amishnot grpmax-eligible	0.219%	456

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.Lys956=
Coding: c.2868G>A
MANE Select: NM_017950
dbSNP: rs1982243
Type: single nucleotide variant
Location: chr17:80095298 (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 p.Lys956Arg Uncertain significance ★ ⚠ same residue
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

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-lys956 (accessed [today's date]).

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