Is PTCH1 p.Pro76Arg (c.227C>G) pathogenic?

PTCH1 p.Pro76Arg (c.227C>G) is classified Uncertain significance in PTCH1 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-05-08). AlphaMissense: likely pathogenic (0.943); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with PTCH1 p.Pro76Arg (c.227C>G)?

PTCH1 p.Pro76Arg (c.227C>G) is associated with hereditary neoplastic syndrome (ClinVar).

How common is PTCH1 p.Pro76Arg (c.227C>G) in the general population?

PTCH1 p.Pro76Arg (c.227C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about PTCH1 p.Pro76Arg (c.227C>G)?

AlphaMissense predicts likely pathogenic (score 0.943) — an in-silico prediction, not a clinical call.

PTCH1 p.Pro76Arg

c.227C>G · VCV3939888

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.943 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.943	likely pathogenic
REVEL	0.869	moderately pathogenic-leaning
SaProt	LLR -7.07	tolerated
⇒ AlphaMissense and REVEL call this damaging; SaProt does not.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 11	GERP 1.7, phastCons 1
Regional constraint	o/e 1.02	unconstrained · MANE · 23 kb · p 0.78 · regional, not allelic
Overall
CADD	29.3	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

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: PTCH1
Protein: p.Pro76Arg
Coding: c.227C>G
MANE Select: NM_000264
Type: single nucleotide variant
Location: chr9:95506574 (GRCh38)
Gene constraint: LOEUF 0.146 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 74.36 · 16 PDB
Residue 76: a β-strand; the 'pre-tm1' region

Full PTCH1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

Similar variants

PTCH1 p.Pro76Ser Uncertain significance ★★ ⚠ same residue
PTCH1 p.Pro76Thr Uncertain significance ★★ ⚠ same residue
PTCH1 p.Pro76= Likely benign ★★ same residue
PTCH1 p.Pro76Leu Uncertain significance ★ ⚠ same residue
PTCH1 c.1068-1G>T Likely pathogenic ★★ same condition
PTCH1 c.1216-1G>A Pathogenic/Likely pathogenic ★★ same condition
PTCH1 c.1347+1G>C Likely pathogenic ★★ same condition
PTCH1 c.202-2A>C Pathogenic/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/ptch1-p-pro76arg (accessed [today's date]).

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