Is PTCH2 p.Arg732= (c.2196G>A) pathogenic?

PTCH2 p.Arg732= (c.2196G>A) is classified Likely benign in PTCH2 (ClinVar, Single submitter, 2 submitters; last evaluated 2026-01-06). Ultra-rare (popmax 0.0232%, nfe); Associated with nevoid basal cell carcinoma syndrome.

What condition is associated with PTCH2 p.Arg732= (c.2196G>A)?

PTCH2 p.Arg732= (c.2196G>A) is associated with nevoid basal cell carcinoma syndrome (ClinVar).

How common is PTCH2 p.Arg732= (c.2196G>A) in the general population?

PTCH2 p.Arg732= (c.2196G>A) is ultra-rare (popmax 0.0232%, nfe) (gnomAD).

PTCH2 p.Arg732=

c.2196G>A · rs369083877 · VCV453929

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0232%, nfe)

Conditions

nevoid basal cell carcinoma syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.93	donor loss, 1 bp away · masked 0 · deltas
Constraint at this position
Conservation	phyloP 4	GERP 0.82, phastCons 1
Overall
CADD	13.55	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0232% European (non-Finnish) · 274/1,180,032 alleles

Filtering AF 0.021% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0201%

Overall 0.0177% 285/1,614,006 alleles · ultra-rare exomes 271/1,461,808 · genomes 14/152,198 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0232%	4,307
Remaining individualsnot grpmax-eligible	0.0144%	6,942
Finnishnot grpmax-eligible	0.00156%	63,966
African / African-American	0.00133%	74,938

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: PTCH2
Protein: p.Arg732=
Coding: c.2196G>A
MANE Select: NM_003738
dbSNP: rs369083877
Type: single nucleotide variant
Location: chr1:44827577 (GRCh38)
Gene constraint: LOEUF 0.895 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.25
Residue 732: the 'extracellular domain 2 (ecd2)' region

Full PTCH2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

nevoid basal cell carcinoma syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

PTCH2 p.Arg732Thr Uncertain significance ★ ⚠ same residue
PTCH2 c.2976+2T>C Uncertain significance ★★ same condition
PTCH2 c.526-2A>G Uncertain significance ★★ same condition
PTCH2 c.618-6C>A Uncertain significance ★★ same condition
PTCH2 p.Ala1052Thr Uncertain significance ★★ ⚠ same condition
PTCH2 p.Ala1090Val Uncertain significance ★★ ⚠ same condition
PTCH2 p.Ala203Val Uncertain significance ★★ same condition
PTCH2 p.Ala21Thr 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/ptch2-p-arg732 (accessed [today's date]).

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