Is PTCH2 p.Ala68Thr (c.202G>A) pathogenic?

PTCH2 p.Ala68Thr (c.202G>A) is classified Uncertain significance in PTCH2 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-02-24). AlphaMissense: likely benign (0.0951); Absent from gnomAD v4.1; Associated with nevoid basal cell carcinoma syndrome.

What condition is associated with PTCH2 p.Ala68Thr (c.202G>A)?

PTCH2 p.Ala68Thr (c.202G>A) is associated with nevoid basal cell carcinoma syndrome (ClinVar).

How common is PTCH2 p.Ala68Thr (c.202G>A) in the general population?

PTCH2 p.Ala68Thr (c.202G>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about PTCH2 p.Ala68Thr (c.202G>A)?

AlphaMissense predicts likely benign (score 0.0951) — an in-silico prediction, not a clinical call.

PTCH2 p.Ala68Thr

c.202G>A · rs2148886394 · VCV2177511

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0951 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

nevoid basal cell carcinoma syndrome

Computational evidence

Protein change
AlphaMissense	0.0951	likely benign
REVEL	0.525	indeterminate
SaProt	LLR -6.92	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.8	GERP 1.7, phastCons 1
Regional constraint	o/e 0.88	unconstrained · MANE · 21 kb · p 3.4e-06 · regional, not allelic
Overall
CADD	25.4	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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: PTCH2
Protein: p.Ala68Thr
Coding: c.202G>A
MANE Select: NM_003738
dbSNP: rs2148886394
Type: single nucleotide variant
Location: chr1:44841910 (GRCh38)
Gene constraint: LOEUF 0.895 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.25

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.Ala68Asp Uncertain significance ★ ⚠ same residue
PTCH2 p.Ala68= Likely benign ★ 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

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-ala68thr (accessed [today's date]).

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