Is PRX p.Cys86Phe (c.257G>T) pathogenic?

PRX p.Cys86Phe (c.257G>T) is classified Uncertain significance in PRX (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-15). AlphaMissense: likely pathogenic (0.638); Very rare (popmax 0.005%, amr); Associated with Inborn genetic diseases.

What condition is associated with PRX p.Cys86Phe (c.257G>T)?

PRX p.Cys86Phe (c.257G>T) is associated with Inborn genetic diseases (ClinVar).

How common is PRX p.Cys86Phe (c.257G>T) in the general population?

PRX p.Cys86Phe (c.257G>T) is very rare (popmax 0.005%, amr) (gnomAD).

What do computational predictors say about PRX p.Cys86Phe (c.257G>T)?

AlphaMissense predicts likely pathogenic (score 0.638) — an in-silico prediction, not a clinical call.

PRX p.Cys86Phe

c.257G>T · VCV4830315

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.638 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.005%, amr)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.638	likely pathogenic · top 8% in PRX
REVEL	0.251	benign-leaning
SaProt	LLR -7.23	tolerated
⇒ AlphaMissense calls this damaging; REVEL and SaProt do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 5.9	GERP 2.2, phastCons 1
Regional constraint	o/e 1.00	unconstrained · MANE · 11 kb · p 0.97 · regional, not allelic
Overall
CADD	27.8	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 0.005% Admixed American · 3/60,026 alleles

Filtering AF 0.00133% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000668%

Overall 0.000274% 4/1,461,796 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.005%	20,009
African / African-American	0.00133%	75,044

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: PRX
Protein: p.Cys86Phe
Coding: c.257G>T
MANE Select: NM_181882
Type: single nucleotide variant
Location: chr19:40398744 (GRCh38)
Gene constraint: LOEUF 1.321 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 35.74 · 1 PDB
Residue 86: the pdz domain; an α-helix

Full PRX 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

PRX p.Cys86Tyr Uncertain significance ★★ ⚠ same residue
PRX p.Cys86Arg Uncertain significance ★ ⚠ same residue
PRX c.184+2T>C Likely pathogenic ★★ same condition
PRX p.Arg368Ter Pathogenic/Likely pathogenic ★★ same condition
PRX p.Cys715Ter Pathogenic/Likely pathogenic ★★ same condition
PRX p.Tyr77Ter Pathogenic ★★ same condition
PRX p.Ala1036Val Uncertain significance ★★ ⚠ same condition
PRX p.Ala1074Thr 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/prx-p-cys86phe (accessed [today's date]).

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