Is MPZ p.Arg67Pro (c.200G>C) pathogenic?

MPZ p.Arg67Pro (c.200G>C) is classified Likely pathogenic in MPZ (ClinVar, Single submitter, 2 submitters; last evaluated 2022-11-15). AlphaMissense: likely pathogenic (0.9954); Absent from gnomAD v4.1; Associated with Charcot-Marie-Tooth disease type 1.

What condition is associated with MPZ p.Arg67Pro (c.200G>C)?

MPZ p.Arg67Pro (c.200G>C) is associated with Charcot-Marie-Tooth disease type 1, Charcot-Marie-Tooth disease (ClinVar).

How common is MPZ p.Arg67Pro (c.200G>C) in the general population?

MPZ p.Arg67Pro (c.200G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about MPZ p.Arg67Pro (c.200G>C)?

AlphaMissense predicts likely pathogenic (score 0.9954) — an in-silico prediction, not a clinical call.

MPZ p.Arg67Pro

c.200G>C · rs201720099 · VCV637325

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.9954 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

Charcot-Marie-Tooth disease type 1

Computational evidence

Protein change
AlphaMissense	0.9954	likely pathogenic ✓ concordant with ClinVar · top 6% in MPZ
REVEL	0.399	indeterminate
SaProt	LLR -12.72	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL is indeterminate.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 7.6	GERP 1.8, phastCons 1
Regional constraint	o/e 0.69	unconstrained · MANE · 3,519 bp · p 4.1e-06 · 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: MPZ
Protein: p.Arg67Pro
Coding: c.200G>C
MANE Select: NM_000530
dbSNP: rs201720099
Type: single nucleotide variant
Location: chr1:161307292 (GRCh38)
Gene constraint: LOEUF 0.708 · pLI 0.11 · ClinGen HI 2/3 (gnomAD)
Structure: AlphaFold pLDDT 82.38 · 2 PDB
Residue 67: a β-strand; the ig-like v-type domain

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

Disease context

Charcot-Marie-Tooth disease type 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Charcot-Marie-Tooth disease

Similar variants

MPZ p.Arg67Cys Uncertain significance ★★ ⚠ same residue
MPZ p.Arg67His Conflicting classifications of pathogenicity ★ ⚠ same residue
MPZ p.Arg67= Likely benign ★ same residue
MPZ p.Arg67fs Pathogenic/Likely pathogenic ★★ same residue
MPZ c.235-1G>T Pathogenic/Likely pathogenic ★★ same condition
MPZ c.448+1G>A Pathogenic/Likely pathogenic ★★ same condition
MPZ c.448+1G>T Likely pathogenic ★★ same condition
MPZ c.448+2T>G 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/mpz-p-arg67pro (accessed [today's date]).

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