Is CCNO p.Gly85= (c.255C>G) pathogenic?

CCNO p.Gly85= (c.255C>G) is classified Likely benign in CCNO (ClinVar, Single submitter, 1 submitter; last evaluated 2025-07-29). Absent from gnomAD v4.1; Associated with primary ciliary dyskinesia.

What condition is associated with CCNO p.Gly85= (c.255C>G)?

CCNO p.Gly85= (c.255C>G) is associated with primary ciliary dyskinesia (ClinVar).

How common is CCNO p.Gly85= (c.255C>G) in the general population?

CCNO p.Gly85= (c.255C>G) 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.

CCNO p.Gly85=

c.255C>G · VCV4812172

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

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 1.1	GERP -1.3, phastCons 0.001
Overall
CADD	4.689	PHRED · no single calibrated threshold — expert panels disagree

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: CCNO
Protein: p.Gly85=
Coding: c.255C>G
MANE Select: NM_021147
Type: single nucleotide variant
Location: chr5:55233269 (GRCh38)
Gene constraint: LOEUF 1.698 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.06
Residue 85: the 'disordered' region

Full CCNO 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

CCNO p.Gly85Ala Uncertain significance ★ same residue
CCNO p.Gly85fs Pathogenic ★★ same residue
CCNO p.Gly85Cys Uncertain significance ★ ⚠ same residue
CCNO p.Gln103Ter Pathogenic ★★ same condition
CCNO p.Ala14Ser Uncertain significance ★★ ⚠ same condition
CCNO p.Ala202Val Uncertain significance ★★ ⚠ same condition
CCNO p.Ala230Thr Uncertain significance ★★ ⚠ same condition
CCNO p.Ala258Gly Uncertain significance ★★ ⚠ 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/ccno-p-gly85 (accessed [today's date]).

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