Is PEX2 p.Tyr277= (c.831C>T) pathogenic?

PEX2 p.Tyr277= (c.831C>T) is classified Likely benign in PEX2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-04-25). Very rare (popmax 0.004%, afr); Associated with peroxisome biogenesis disorder 5A (Zellweger).

What condition is associated with PEX2 p.Tyr277= (c.831C>T)?

PEX2 p.Tyr277= (c.831C>T) is associated with peroxisome biogenesis disorder 5A (Zellweger) (ClinVar).

How common is PEX2 p.Tyr277= (c.831C>T) in the general population?

PEX2 p.Tyr277= (c.831C>T) is very rare (popmax 0.004%, afr) (gnomAD).

PEX2 p.Tyr277=

c.831C>T · rs1362192051 · VCV2125411

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.004%, afr)

Conditions

peroxisome biogenesis disorder 5A (Zellweger)

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.7	GERP 2.4, phastCons 1
Overall
CADD	7.203	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.004% African / African-American · 3/74,918 alleles

Filtering AF 0.00106% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000495%

Overall 0.000186% 3/1,613,904 alleles · very rare exomes 1/1,461,738 · genomes 2/152,166 · joint denominator

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: PEX2
Protein: p.Tyr277=
Coding: c.831C>T
MANE Select: NM_000318
dbSNP: rs1362192051
Type: single nucleotide variant
Location: chr8:76983348 (GRCh38)
Gene constraint: LOEUF 1.057 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.17
Residue 277: a UniProt-annotated variant site (in pbd5a); a UniProt-annotated variant site (in pbd5b and pbd5a); a UniProt-annotated variant site (in pbd5b)

Full PEX2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

peroxisome biogenesis disorder 5A (Zellweger) — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

PEX2 p.Tyr277Cys Uncertain significance ★ ⚠ same residue
PEX2 p.Tyr277Ter Likely pathogenic ★ same residue
PEX2 c.-17-2A>G Pathogenic/Likely pathogenic ★★ same condition
PEX2 p.Arg119Ter Pathogenic ★★ same condition
PEX2 p.Arg125Ter Pathogenic/Likely pathogenic ★★ same condition
PEX2 p.Gln31Ter Pathogenic/Likely pathogenic ★★ same condition
PEX2 p.Gln78Ter Pathogenic/Likely pathogenic ★★ same condition
PEX2 p.Gln96Ter 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/pex2-p-tyr277 (accessed [today's date]).

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