Is CPLANE1 p.Lys209Arg (c.626A>G) pathogenic?

CPLANE1 p.Lys209Arg (c.626A>G) is classified Conflicting classifications of pathogenicity in CPLANE1 (ClinVar, Conflicting submitters, 4 submitters; last evaluated 2026-01-21). AlphaMissense: likely benign (0.0781); Low-frequency (popmax 1.12%, mid); Associated with Joubert syndrome 17.

What condition is associated with CPLANE1 p.Lys209Arg (c.626A>G)?

CPLANE1 p.Lys209Arg (c.626A>G) is associated with Joubert syndrome 17 (ClinVar).

How common is CPLANE1 p.Lys209Arg (c.626A>G) in the general population?

CPLANE1 p.Lys209Arg (c.626A>G) is low-frequency (popmax 1.12%, mid) (gnomAD).

What do computational predictors say about CPLANE1 p.Lys209Arg (c.626A>G)?

AlphaMissense predicts likely benign (score 0.0781) — an in-silico prediction, not a clinical call.

CPLANE1 p.Lys209Arg

c.626A>G · rs770630520 · VCV353467

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 4 submitters

AlphaMissense

likely benign

0.0781 · ACMG-weighted

gnomAD v4.1

Rare

low-frequency (popmax 1.12%, mid)

Missense predictors

0/2 damaging

AlphaMissense, REVEL

Conditions

Joubert syndrome 17

Computational evidence

Protein change
AlphaMissense	0.0781	likely benign
REVEL	0.014	strongly 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 2.2	GERP -2.1, phastCons 1
Regional constraint	o/e 0.92	unconstrained · MANE · 139 kb · p 2.3e-06 · regional, not allelic
Overall
CADD	15.27	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 1.12% Middle Eastern · 67/5,984 alleles

Filtering AF 0.905% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.826%

Overall 0.0153% 237/1,548,790 alleles · low-frequency

Ancestry group	Frequency	1 in
Middle Easterngrpmax	1.12%	89
Admixed American	0.0534%	1,872
Remaining individualsnot grpmax-eligible	0.0533%	1,875
Ashkenazi Jewishnot grpmax-eligible	0.028%	3,576
African / African-American	0.0233%	4,295
South Asian	0.0168%	5,960
European (non-Finnish)	0.00628%	15,913

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.Lys209Arg
Coding: c.626A>G
MANE Select: NM_001384732
dbSNP: rs770630520
Type: single nucleotide variant
Location: chr5:37243064 (GRCh38)
Gene constraint: LOEUF 0.728 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)

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

Similar variants

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
CPLANE1 c.3290-2A>G Pathogenic/Likely pathogenic ★★ same condition
CPLANE1 c.3673-1G>C Pathogenic/Likely pathogenic ★★ same condition
CPLANE1 c.677+1G>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/cplane1-p-lys209arg (accessed [today's date]).

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