Is CCNO p.Cys155Ser (c.463T>A) pathogenic?

CCNO p.Cys155Ser (c.463T>A) is classified Uncertain significance in CCNO (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-08-20). AlphaMissense: likely pathogenic (0.7081); Very rare (popmax 0.01%, amr); Associated with primary ciliary dyskinesia.

What condition is associated with CCNO p.Cys155Ser (c.463T>A)?

CCNO p.Cys155Ser (c.463T>A) is associated with primary ciliary dyskinesia (ClinVar).

How common is CCNO p.Cys155Ser (c.463T>A) in the general population?

CCNO p.Cys155Ser (c.463T>A) is very rare (popmax 0.01%, amr) (gnomAD).

How is Primary ciliary dyskinesia inherited?

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

What do computational predictors say about CCNO p.Cys155Ser (c.463T>A)?

AlphaMissense predicts likely pathogenic (score 0.7081) — an in-silico prediction, not a clinical call.

CCNO p.Cys155Ser

c.463T>A · rs758456393 · VCV665573

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.7081 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.01%, amr)

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

primary ciliary dyskinesia

Computational evidence

Protein change
AlphaMissense	0.7081	likely pathogenic
REVEL	0.468	indeterminate
SaProt	LLR -7.89	tolerated
⇒ AlphaMissense calls this damaging; SaProt does not; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 1.8, phastCons 1
Regional constraint	o/e 1.14	unconstrained · MANE · 2,145 bp · p 0.0026 · regional, not allelic
Overall
CADD	29.0	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.01% Admixed American · 6/60,012 alleles

Filtering AF 0.00428% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00295%

Overall 0.000372% 6/1,613,924 alleles · very rare

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: CCNO
Protein: p.Cys155Ser
Coding: c.463T>A
MANE Select: NM_021147
dbSNP: rs758456393
Type: single nucleotide variant
Location: chr5:55232465 (GRCh38)
Gene constraint: LOEUF 1.698 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.06

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.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
CCNO p.Arg124Leu Uncertain significance ★★ ⚠ same condition
CCNO p.Arg124Trp Uncertain significance ★★ ⚠ same condition
CCNO p.Arg133Leu 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-cys155ser (accessed [today's date]).

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