Is CPLANE1 p.Arg2733Trp (c.8197C>T) pathogenic?

CPLANE1 p.Arg2733Trp (c.8197C>T) is classified Uncertain significance in CPLANE1 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-05-08). AlphaMissense: likely benign (0.1077); Ultra-rare (popmax 0.0107%, afr); Associated with Joubert syndrome 17.

What condition is associated with CPLANE1 p.Arg2733Trp (c.8197C>T)?

CPLANE1 p.Arg2733Trp (c.8197C>T) is associated with Joubert syndrome 17, orofaciodigital syndrome type 6 (ClinVar).

How common is CPLANE1 p.Arg2733Trp (c.8197C>T) in the general population?

CPLANE1 p.Arg2733Trp (c.8197C>T) is ultra-rare (popmax 0.0107%, afr) (gnomAD).

What do computational predictors say about CPLANE1 p.Arg2733Trp (c.8197C>T)?

AlphaMissense predicts likely benign (score 0.1077) — an in-silico prediction, not a clinical call.

CPLANE1 p.Arg2733Trp

c.8197C>T · rs142792453 · VCV353426

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.1077 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0107%, afr)

Missense predictors

0/2 damaging

AlphaMissense, REVEL

Conditions

Joubert syndrome 17

Computational evidence

Protein change
AlphaMissense	0.1077	likely benign
REVEL	0.086	moderately benign-leaning
⇒ AlphaMissense and REVEL both call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1	GERP -1.5
Regional constraint	o/e 0.92	unconstrained · MANE · 139 kb · p 2.3e-06 · regional, not allelic
Overall
CADD	15.95	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM R2679W vs ClinVar R2733W) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0107% African / African-American · 8/74,894 alleles

Filtering AF 0.00528% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00381%

Overall 0.0013% 21/1,613,970 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0107%	9,362
East Asian	0.00445%	22,448
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,604
Remaining individualsnot grpmax-eligible	0.0016%	62,480
South Asian	0.0011%	91,082
European (non-Finnish)	0.000678%	147,502

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: CPLANE1
Protein: p.Arg2733Trp
Coding: c.8197C>T
MANE Select: NM_001384732
dbSNP: rs142792453
Type: single nucleotide variant
Location: chr5:37153916 (GRCh38)
Gene constraint: LOEUF 0.728 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Residue 2733: a UniProt-annotated variant site (in ofd6; likely pathogenic)

Full CPLANE1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Joubert syndrome 17 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: orofaciodigital syndrome type 6

Similar variants

CPLANE1 p.Arg2733Gln Uncertain significance ★ ⚠ same residue
CPLANE1 p.Arg2733Gly Uncertain significance ★ ⚠ same residue
CPLANE1 p.Arg2733Pro Uncertain significance ★ ⚠ same residue
CPLANE1 c.1372-2A>G Pathogenic/Likely pathogenic ★★ same condition
CPLANE1 c.2291+1G>A Likely pathogenic ★★ same condition
CPLANE1 c.2291+2T>C Pathogenic/Likely pathogenic ★★ same condition
CPLANE1 c.2292-1G>A Likely pathogenic ★★ same condition
CPLANE1 c.2500+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/cplane1-p-arg2733trp (accessed [today's date]).

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