Is CPOX p.Asp343Val (c.1028A>T) pathogenic?

CPOX p.Asp343Val (c.1028A>T) is classified Likely benign in CPOX (ClinVar, Single submitter, 1 submitter; last evaluated 2018-01-13). AlphaMissense: ambiguous (0.3436); Rare (popmax 0.107%, eas); Associated with hereditary coproporphyria.

What condition is associated with CPOX p.Asp343Val (c.1028A>T)?

CPOX p.Asp343Val (c.1028A>T) is associated with hereditary coproporphyria (ClinVar).

How common is CPOX p.Asp343Val (c.1028A>T) in the general population?

CPOX p.Asp343Val (c.1028A>T) is rare (popmax 0.107%, eas) (gnomAD).

How is Hereditary coproporphyria inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about CPOX p.Asp343Val (c.1028A>T)?

AlphaMissense predicts ambiguous (score 0.3436) — an in-silico prediction, not a clinical call.

CPOX p.Asp343Val

c.1028A>T · rs201071538 · VCV901578

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3436 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.107%, eas)

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

hereditary coproporphyria

Computational evidence

Protein change
AlphaMissense	0.3436	ambiguous
REVEL	0.782	moderately pathogenic-leaning
SaProt	LLR -2.83	tolerated
⇒ REVEL calls this damaging; SaProt does not; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 5.1	GERP -0.87, phastCons 1
Regional constraint	o/e 0.76	unconstrained · MANE · 10 kb · p 7.6e-05 · regional, not allelic
Overall
CADD	29.7	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 0.107% East Asian · 48/44,830 alleles

Filtering AF 0.083% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0744%

Overall 0.00304% 49/1,613,610 alleles · rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.107%	934
Remaining individualsnot grpmax-eligible	0.0016%	62,498

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: CPOX
Protein: p.Asp343Val
Coding: c.1028A>T
MANE Select: NM_000097
dbSNP: rs201071538
Type: single nucleotide variant
Location: chr3:98585585 (GRCh38)
Gene constraint: LOEUF 0.8 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 80.32 · 1 PDB
Residue 343: a UniProt-annotated variant site (in hcp)

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

Disease context

hereditary coproporphyria — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Hereditary coproporphyria (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Adult
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

CPOX p.Gln160Ter Pathogenic ★★ same condition
CPOX p.Glu201Lys Pathogenic/Likely pathogenic ★★ same condition
CPOX p.Lys404Glu Pathogenic/Likely pathogenic ★★ same condition
CPOX p.Arg60Gly Uncertain significance ★★ ⚠ same condition
CPOX p.Thr56Met Uncertain significance ★★ ⚠ same condition
CPOX p.Val16Gly Uncertain significance ★★ ⚠ same condition
CPOX c.1172+14A>G Benign ★★ same condition
CPOX c.556+9G>A Benign/Likely benign ★★ 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/cpox-p-asp343val (accessed [today's date]).

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