Is CC2D2A p.Arg976Thr (c.2927G>C) pathogenic?

CC2D2A p.Arg976Thr (c.2927G>C) is classified Uncertain significance in CC2D2A (ClinVar, Single submitter, 1 submitter; last evaluated 2022-01-24). AlphaMissense: likely pathogenic (0.6449); Very rare (popmax 0.000189%, nfe); Associated with Joubert syndrome.

What condition is associated with CC2D2A p.Arg976Thr (c.2927G>C)?

CC2D2A p.Arg976Thr (c.2927G>C) is associated with Joubert syndrome, Meckel syndrome (ClinVar).

How common is CC2D2A p.Arg976Thr (c.2927G>C) in the general population?

CC2D2A p.Arg976Thr (c.2927G>C) is very rare (popmax 0.000189%, nfe) (gnomAD).

What do computational predictors say about CC2D2A p.Arg976Thr (c.2927G>C)?

AlphaMissense predicts likely pathogenic (score 0.6449) — an in-silico prediction, not a clinical call.

CC2D2A p.Arg976Thr

c.2927G>C · rs1327730952 · VCV1981412

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.6449 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000189%, nfe)

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Joubert syndrome

Computational evidence

Protein change
AlphaMissense	0.6449	likely pathogenic
REVEL	0.703	pathogenic-leaning
SaProt	LLR -6.46	tolerated
⇒ AlphaMissense and REVEL call this damaging; SaProt does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2.3, phastCons 1
Regional constraint	o/e 0.96	unconstrained · MANE · 104 kb · p 0.09 · regional, not allelic
Overall
CADD	27.3	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 0.000189% European (non-Finnish) · 2/1,058,002 alleles

Filtering AF 3.1e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.2e-05%

Overall 0.000152% 2/1,313,744 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: CC2D2A
Protein: p.Arg976Thr
Coding: c.2927G>C
MANE Select: NM_001378615
dbSNP: rs1327730952
Type: single nucleotide variant
Location: chr4:15560535 (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.Arg976= Likely benign ★ 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
CC2D2A c.1608-2A>G Likely pathogenic ★★ same condition
CC2D2A c.2004-17A>G Pathogenic/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-arg976thr (accessed [today's date]).

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