Is PPOX p.Pro28Arg (c.83C>G) pathogenic?

PPOX p.Pro28Arg (c.83C>G) is classified Uncertain significance in PPOX (ClinVar, Single submitter, 2 submitters; last evaluated 2025-08-09). AlphaMissense: likely benign (0.233); Ultra-rare (popmax 0.0165%, sas); Associated with Inborn genetic diseases.

What condition is associated with PPOX p.Pro28Arg (c.83C>G)?

PPOX p.Pro28Arg (c.83C>G) is associated with Inborn genetic diseases (ClinVar).

How common is PPOX p.Pro28Arg (c.83C>G) in the general population?

PPOX p.Pro28Arg (c.83C>G) is ultra-rare (popmax 0.0165%, sas) (gnomAD).

What do computational predictors say about PPOX p.Pro28Arg (c.83C>G)?

AlphaMissense predicts likely benign (score 0.233) — an in-silico prediction, not a clinical call.

PPOX p.Pro28Arg

c.83C>G · VCV4142705

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.233 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, sas)

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.233	likely benign
REVEL	0.711	pathogenic-leaning
SaProt	LLR -14.53	damaging
⇒ REVEL and SaProt call this damaging; AlphaMissense does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.9	GERP 1.4, phastCons 1
Overall
CADD	24.0	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 0.0165% South Asian · 15/91,086 alleles

Filtering AF 0.0101% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00811%

Overall 0.00192% 31/1,613,872 alleles · ultra-rare exomes 27/1,461,628 · genomes 4/152,244 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0165%	6,072
African / African-American	0.00667%	14,990
European (non-Finnish)	0.000932%	107,274

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: PPOX
Protein: p.Pro28Arg
Coding: c.83C>G
MANE Select: NM_001122764
Type: single nucleotide variant
Location: chr1:161166930 (GRCh38)
Gene constraint: LOEUF 0.581 · pLI 0.24 (gnomAD)
Structure: AlphaFold pLDDT 95.39 · 3 PDB

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

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

PPOX p.Pro28Ala Uncertain significance ★★ ⚠ same residue
PPOX p.Pro28Thr Uncertain significance ★★ ⚠ same residue
PPOX p.Pro28Leu Uncertain significance ★ ⚠ same residue
PPOX p.Ala221Thr Uncertain significance ★★ ⚠ same condition
PPOX p.Arg152His Uncertain significance ★★ ⚠ same condition
PPOX p.Arg267Cys Uncertain significance ★★ ⚠ same condition
PPOX p.Arg3Gln Uncertain significance ★★ ⚠ same condition
PPOX p.Gln421His 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/ppox-p-pro28arg (accessed [today's date]).

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