Is PTCH2 p.Arg898Pro (c.2693G>C) pathogenic?

PTCH2 p.Arg898Pro (c.2693G>C) is classified Uncertain significance in PTCH2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-03-06). AlphaMissense: likely benign (0.3177); Very rare (popmax 0.00988%, sas); Associated with nevoid basal cell carcinoma syndrome.

What condition is associated with PTCH2 p.Arg898Pro (c.2693G>C)?

PTCH2 p.Arg898Pro (c.2693G>C) is associated with nevoid basal cell carcinoma syndrome (ClinVar).

How common is PTCH2 p.Arg898Pro (c.2693G>C) in the general population?

PTCH2 p.Arg898Pro (c.2693G>C) is very rare (popmax 0.00988%, sas) (gnomAD).

What do computational predictors say about PTCH2 p.Arg898Pro (c.2693G>C)?

AlphaMissense predicts likely benign (score 0.3177) — an in-silico prediction, not a clinical call.

PTCH2 p.Arg898Pro

c.2693G>C · VCV3630244

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.3177 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00988%, sas)

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

nevoid basal cell carcinoma syndrome

Computational evidence

Protein change
AlphaMissense	0.3177	likely benign
REVEL	0.719	pathogenic-leaning
SaProt	LLR -10.55	damaging
⇒ REVEL and SaProt call this damaging; AlphaMissense does not.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 0.77	GERP -0.47, phastCons 1
Regional constraint	o/e 0.88	unconstrained · MANE · 21 kb · p 3.4e-06 · regional, not allelic
Overall
CADD	21.9	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 0.00988% South Asian · 9/91,080 alleles

Filtering AF 0.00514% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00375%

Overall 0.000558% 9/1,613,934 alleles · very rare exomes 9/1,461,704 · genomes 0/152,230 · joint denominator

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.Arg898Pro
Coding: c.2693G>C
MANE Select: NM_003738
Type: single nucleotide variant
Location: chr1:44826904 (GRCh38)
Gene constraint: LOEUF 0.895 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.25
Residue 898: 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.Arg898Cys Uncertain significance ★★ ⚠ same residue
PTCH2 p.Arg898His Likely benign ★ same residue
PTCH2 p.Arg898Gly 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

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-arg898pro (accessed [today's date]).

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