Is CC2D2A p.Thr1297= (c.3891T>G) pathogenic?

CC2D2A p.Thr1297= (c.3891T>G) is classified Likely benign in CC2D2A (ClinVar, Single submitter, 1 submitter; last evaluated 2023-02-14). Absent from gnomAD v4.1; Associated with Joubert syndrome.

What condition is associated with CC2D2A p.Thr1297= (c.3891T>G)?

CC2D2A p.Thr1297= (c.3891T>G) is associated with Joubert syndrome, Meckel syndrome (ClinVar).

How common is CC2D2A p.Thr1297= (c.3891T>G) in the general population?

CC2D2A p.Thr1297= (c.3891T>G) is absent from gnomAD v4.1 (gnomAD).

CC2D2A p.Thr1297=

c.3891T>G · rs2475106265 · VCV2935477

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

Joubert syndrome

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 -20	GERP -4.8
Overall
CADD	0.048	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: CC2D2A
Protein: p.Thr1297=
Coding: c.3891T>G
MANE Select: NM_001378615
dbSNP: rs2475106265
Type: single nucleotide variant
Location: chr4:15580087 (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 p.Thr1297Arg Uncertain significance ★★ same residue
CC2D2A p.Thr1297Pro Uncertain significance ★ ⚠ same residue
CC2D2A p.Thr1297Ser Uncertain significance ★ ⚠ same residue
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

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-thr1297 (accessed [today's date]).

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