Is CASP8 p.Ile174Val (c.520A>G) pathogenic?

CASP8 p.Ile174Val (c.520A>G) is classified Uncertain significance in CASP8 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-01-27). AlphaMissense: likely benign (0.0817); Absent from gnomAD v4.1; Associated with autoimmune lymphoproliferative syndrome type 2B.

What condition is associated with CASP8 p.Ile174Val (c.520A>G)?

CASP8 p.Ile174Val (c.520A>G) is associated with autoimmune lymphoproliferative syndrome type 2B (ClinVar).

How common is CASP8 p.Ile174Val (c.520A>G) in the general population?

CASP8 p.Ile174Val (c.520A>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CASP8 p.Ile174Val (c.520A>G)?

AlphaMissense predicts likely benign (score 0.0817) — an in-silico prediction, not a clinical call.

CASP8 p.Ile174Val

Q: How is Autoimmune lymphoproliferative syndrome-recurrent viral infections due to CASP8 deficiency inherited?

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

c.520A>G · rs1042533208 · VCV1424505

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0817 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

autoimmune lymphoproliferative syndrome type 2B

Computational evidence

Protein change
AlphaMissense	0.0817	likely benign
REVEL	0.115	moderately benign-leaning
SaProt	LLR -7.52	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	Δ0.86	donor gain · deltas
Pangolin	Δ0.76	gain · loss 0.27 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 7.9	GERP 1.9, phastCons 1
Regional constraint	o/e 0.82	unconstrained · MANE · 20 kb · p 2.8e-05 · regional, not allelic
Overall
CADD	25.1	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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: CASP8
Protein: p.Ile174Val
Coding: c.520A>G
MANE Select: NM_001372051
dbSNP: rs1042533208
Type: single nucleotide variant
Location: chr2:201272746 (GRCh38)
Gene constraint: LOEUF 0.695 · pLI 0.01 (gnomAD)
Structure: AlphaFold pLDDT 82.37 · 36 PDB
Residue 174: the ded 2 domain; an α-helix

Full CASP8 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

autoimmune lymphoproliferative syndrome type 2B — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autoimmune lymphoproliferative syndrome-recurrent viral infections due to CASP8 deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood
Prevalence: <1 / 1 000 000 (Worldwide)

Similar variants

CASP8 p.Arg248Trp Pathogenic/Likely pathogenic ★★ same condition
CASP8 c.306-1926A>G Uncertain significance ★★ same condition
CASP8 c.306-1935G>A Uncertain significance ★★ same condition
CASP8 c.306-1971A>G Uncertain significance ★★ same condition
CASP8 c.660+6C>T Uncertain significance ★★ same condition
CASP8 c.*107C>T Uncertain significance ★★ same condition
CASP8 p.Ala96Ser Uncertain significance ★★ ⚠ same condition
CASP8 p.Arg233Trp 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/casp8-p-ile174val (accessed [today's date]).

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