Is CEP290 p.Ala774= (c.2322C>T) pathogenic?

CEP290 p.Ala774= (c.2322C>T) is classified Likely benign in CEP290 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-12-16). Absent from gnomAD v4.1; Associated with Joubert syndrome.

What condition is associated with CEP290 p.Ala774= (c.2322C>T)?

CEP290 p.Ala774= (c.2322C>T) is associated with Joubert syndrome, Meckel syndrome, nephronophthisis (ClinVar).

How common is CEP290 p.Ala774= (c.2322C>T) in the general population?

CEP290 p.Ala774= (c.2322C>T) is absent from gnomAD v4.1 (gnomAD).

CEP290 p.Ala774=

c.2322C>T · rs2500739689 · VCV2942398

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,486,162)

Conditions

Joubert syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>T here scores Δ0.49 · evaluated, not missing
Constraint at this position
Conservation	phyloP 3	GERP 1.2, phastCons 1
Overall
CADD	10.98	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,486,162). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: CEP290
Protein: p.Ala774=
Coding: c.2322C>T
MANE Select: NM_025114
dbSNP: rs2500739689
Type: single nucleotide variant
Location: chr12:88111247 (GRCh38)
Gene constraint: LOEUF 1.094 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 60.90
Residue 774: a UniProt-annotated variant site (in lca10; also found in a patient with night blindness and hearing loss); the 'interaction with iqcb1' region

Full CEP290 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

Also linked: Meckel syndrome nephronophthisis

Similar variants

CEP290 p.Ala774Pro Uncertain significance ★★ ⚠ same residue
CEP290 p.Ala774Gly Uncertain significance ★ ⚠ same residue
CEP290 c.1189+1G>A Pathogenic ★★★ same condition
CEP290 c.1189+2T>C Pathogenic ★★★ same condition
CEP290 c.297+1G>T Pathogenic ★★★ same condition
CEP290 c.2991+1655A>G Pathogenic ★★★ same condition
CEP290 c.6271-8T>G Pathogenic ★★★ same condition
CEP290 p.Arg1272Ter 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/cep290-p-ala774 (accessed [today's date]).

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