Is ACP5 p.Val256Met (c.766G>A) pathogenic?

ACP5 p.Val256Met (c.766G>A) is classified Uncertain significance in ACP5 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-03-20). AlphaMissense: ambiguous (0.4075); Ultra-rare (popmax 0.0138%, nfe); Associated with Spondyloenchondrodysplasia with immune dysregulation.

What condition is associated with ACP5 p.Val256Met (c.766G>A)?

ACP5 p.Val256Met (c.766G>A) is associated with Spondyloenchondrodysplasia with immune dysregulation (ClinVar).

How common is ACP5 p.Val256Met (c.766G>A) in the general population?

ACP5 p.Val256Met (c.766G>A) is ultra-rare (popmax 0.0138%, nfe) (gnomAD).

What do computational predictors say about ACP5 p.Val256Met (c.766G>A)?

AlphaMissense predicts ambiguous (score 0.4075) — an in-silico prediction, not a clinical call.

ACP5 p.Val256Met

c.766G>A · rs146196342 · VCV1350937

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

ambiguous

0.4075 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0138%, nfe)

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

Spondyloenchondrodysplasia with immune dysregulation

Computational evidence

Protein change
AlphaMissense	0.4075	ambiguous
REVEL	0.147	moderately benign-leaning
SaProt	LLR -7.94	tolerated
⇒ REVEL and SaProt both call this tolerated; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.2	GERP -1.2, phastCons 0.98
Regional constraint	o/e 0.84	unconstrained · MANE · 2,304 bp · p 0.00091 · regional, not allelic
Overall
CADD	18.85	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 0.0138% European (non-Finnish) · 163/1,180,038 alleles

Filtering AF 0.0121% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0114%

Overall 0.0106% 171/1,613,734 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0138%	7,240
Remaining individualsnot grpmax-eligible	0.0064%	15,620
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,606
Admixed American	0.00333%	29,994
South Asian	0.0011%	91,086

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: ACP5
Protein: p.Val256Met
Coding: c.766G>A
MANE Select: NM_001611
dbSNP: rs146196342
Type: single nucleotide variant
Location: chr19:11575222 (GRCh38)
Gene constraint: LOEUF 1.14 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 94.82 · 2 PDB
Residue 256: a β-strand

Full ACP5 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Spondyloenchondrodysplasia with immune dysregulation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

ACP5 p.Val256Leu Conflicting classifications of pathogenicity ★ ⚠ same residue
ACP5 p.Arg176Ter Pathogenic ★★ same condition
ACP5 p.Gln184Ter Pathogenic/Likely pathogenic ★★ same condition
ACP5 p.Gly109Arg Pathogenic/Likely pathogenic ★★ same condition
ACP5 p.Met264Lys Pathogenic/Likely pathogenic ★★ ⚠ same condition
ACP5 p.Tyr123Ter Pathogenic ★★ same condition
ACP5 p.Tyr246Ter Pathogenic/Likely pathogenic ★★ same condition
ACP5 p.Tyr74Ter Pathogenic/Likely 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/acp5-p-val256met (accessed [today's date]).

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