Is CEP104 p.Tyr266= (c.798C>T) pathogenic?

CEP104 p.Tyr266= (c.798C>T) is classified Likely benign in CEP104 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-05). Ultra-rare (popmax 0.0164%, mid); Associated with Joubert syndrome 25.

What condition is associated with CEP104 p.Tyr266= (c.798C>T)?

CEP104 p.Tyr266= (c.798C>T) is associated with Joubert syndrome 25 (ClinVar).

How common is CEP104 p.Tyr266= (c.798C>T) in the general population?

CEP104 p.Tyr266= (c.798C>T) is ultra-rare (popmax 0.0164%, mid) (gnomAD).

CEP104 p.Tyr266=

c.798C>T · VCV4747592

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0164%, mid)

Conditions

Joubert syndrome 25

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 -4.2	GERP -3.3
Overall
CADD	2.249	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0164% Middle Eastern · 1/6,084 alleles

Filtering AF 0.00106% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000787%

Overall 0.00198% 32/1,613,880 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0164%	6,084
Finnishnot grpmax-eligible	0.0109%	9,144
African / African-American	0.00401%	24,963
East Asian	0.00223%	44,888
Admixed American	0.00167%	59,976
Remaining individualsnot grpmax-eligible	0.0016%	62,482
European (non-Finnish)	0.00153%	65,553

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: CEP104
Protein: p.Tyr266=
Coding: c.798C>T
MANE Select: NM_014704
Type: single nucleotide variant
Location: chr1:3839057 (GRCh38)
Gene constraint: LOEUF 0.851 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 76.75 · 2 PDB
Residue 266: a UniProt-annotated variant site (in mrt77)

Full CEP104 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Joubert syndrome 25 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CEP104 p.Arg299Ter Pathogenic/Likely pathogenic ★★ same condition
CEP104 p.Arg55Ter Pathogenic/Likely pathogenic ★★ same condition
CEP104 p.Glu627Ter Pathogenic/Likely pathogenic ★★ same condition
CEP104 p.Lys270Ter Pathogenic/Likely pathogenic ★★ same condition
CEP104 p.Tyr253Ter Pathogenic/Likely pathogenic ★★ same condition
CEP104 c.1120-5T>A Uncertain significance ★★ same condition
CEP104 p.Ala269Thr Uncertain significance ★★ ⚠ same condition
CEP104 p.Ala28Val 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/cep104-p-tyr266 (accessed [today's date]).

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