Is CC2D2A p.His774= (c.2322C>T) pathogenic?

CC2D2A p.His774= (c.2322C>T) is classified Likely benign in CC2D2A (ClinVar, Single submitter, 1 submitter; last evaluated 2023-07-21). Very rare (popmax 0.00134%, afr); Associated with Joubert syndrome.

What condition is associated with CC2D2A p.His774= (c.2322C>T)?

CC2D2A p.His774= (c.2322C>T) is associated with Joubert syndrome, Meckel syndrome (ClinVar).

How common is CC2D2A p.His774= (c.2322C>T) in the general population?

CC2D2A p.His774= (c.2322C>T) is very rare (popmax 0.00134%, afr) (gnomAD).

CC2D2A p.His774=

c.2322C>T · rs1412103905 · VCV2934355

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00134%, afr)

Conditions

Joubert syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -7.5	GERP -4.9
Overall
CADD	5.082	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00134% African / African-American · 1/74,756 alleles

Filtering AF 0.000126% ClinGen BA1/BS1 input FAF95, joint · FAF99 9.1e-05%

Overall 0.000376% 6/1,595,290 alleles · very rare exomes 4/1,443,182 · genomes 2/152,108 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00134%	74,756
European (non-Finnish)	0.000429%	233,149

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: CC2D2A
Protein: p.His774=
Coding: c.2322C>T
MANE Select: NM_001378615
dbSNP: rs1412103905
Type: single nucleotide variant
Location: chr4:15550964 (GRCh38)
Gene constraint: LOEUF 0.854 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 69.46

Full CC2D2A 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

Similar variants

CC2D2A c.1017+1G>A Pathogenic/Likely pathogenic ★★ same condition
CC2D2A c.123+2T>G Likely pathogenic ★★ same condition
CC2D2A c.1359+1G>C Likely pathogenic ★★ same condition
CC2D2A c.1466+1G>A Likely pathogenic ★★ same condition
CC2D2A c.1466+2T>C Likely pathogenic ★★ same condition
CC2D2A c.1608-2A>G Likely pathogenic ★★ same condition
CC2D2A c.2004-17A>G Pathogenic/Likely pathogenic ★★ same condition
CC2D2A c.2486+1G>A 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/cc2d2a-p-his774 (accessed [today's date]).

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