Is CDON p.Arg1187His (c.3560G>A) pathogenic?

CDON p.Arg1187His (c.3560G>A) is classified Conflicting classifications of pathogenicity in CDON (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2023-07-19). AlphaMissense: likely benign (0.1269); Ultra-rare (popmax 0.0164%, mid); Associated with CDON-related disorder.

What condition is associated with CDON p.Arg1187His (c.3560G>A)?

CDON p.Arg1187His (c.3560G>A) is associated with CDON-related disorder, holoprosencephaly 11 (ClinVar).

How common is CDON p.Arg1187His (c.3560G>A) in the general population?

CDON p.Arg1187His (c.3560G>A) is ultra-rare (popmax 0.0164%, mid) (gnomAD).

What do computational predictors say about CDON p.Arg1187His (c.3560G>A)?

AlphaMissense predicts likely benign (score 0.1269) — an in-silico prediction, not a clinical call.

CDON p.Arg1187His

c.3560G>A · rs771268293 · VCV2144121

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.1269 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0164%, mid)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

CDON-related disorder

Computational evidence

Protein change
AlphaMissense	0.1269	likely benign
REVEL	0.041	moderately benign-leaning
SaProt	LLR -6.32	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.4	GERP -3.7
Regional constraint	o/e 0.93	unconstrained · MANE · 63 kb · p 0.0032 · regional, not allelic
Overall
CADD	0.953	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 0.0164% Middle Eastern · 1/6,084 alleles

Filtering AF 0.00347% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00229%

Overall 0.000929% 15/1,614,020 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0164%	6,084
African / African-American	0.00801%	12,487
East Asian	0.00223%	44,882
Remaining individualsnot grpmax-eligible	0.0016%	62,488
European (non-Finnish)	0.000508%	196,668

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: CDON
Protein: p.Arg1187His
Coding: c.3560G>A
MANE Select: NM_001378964
dbSNP: rs771268293
Type: single nucleotide variant
Location: chr11:125961795 (GRCh38)
Gene constraint: LOEUF 0.733 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 62.62 · 3 PDB

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

Disease context

CDON-related disorder

Also linked: holoprosencephaly 11

Similar variants

CDON p.Arg1187Cys Benign/Likely benign ★★ same residue
CDON c.3276+1G>T Uncertain significance ★★ same condition
CDON c.640+1G>A Uncertain significance ★★ same condition
CDON c.*1805A>G Uncertain significance ★★ same condition
CDON c.*1816C>T Uncertain significance ★★ same condition
CDON c.*2349A>C Uncertain significance ★★ same condition
CDON c.*2377T>C Uncertain significance ★★ same condition
CDON c.*2760A>G Uncertain significance ★★ 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/cdon-p-arg1187his (accessed [today's date]).

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