Is PSAP p.Arg232Leu (c.695G>T) pathogenic?

PSAP p.Arg232Leu (c.695G>T) is classified Uncertain significance in PSAP (ClinVar, Single submitter, 1 submitter; last evaluated 2021-10-02). AlphaMissense: likely benign (0.106); Very rare (popmax 0.00333%, amr); Associated with metachromatic leukodystrophy due to saposin B deficiency.

What condition is associated with PSAP p.Arg232Leu (c.695G>T)?

PSAP p.Arg232Leu (c.695G>T) is associated with metachromatic leukodystrophy due to saposin B deficiency (ClinVar).

How common is PSAP p.Arg232Leu (c.695G>T) in the general population?

PSAP p.Arg232Leu (c.695G>T) is very rare (popmax 0.00333%, amr) (gnomAD).

How is Metachromatic leukodystrophy inherited?

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

What do computational predictors say about PSAP p.Arg232Leu (c.695G>T)?

AlphaMissense predicts likely benign (score 0.106) — an in-silico prediction, not a clinical call.

PSAP p.Arg232Leu

c.695G>T · rs147265566 · VCV1496925

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.106 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00333%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

metachromatic leukodystrophy due to saposin B deficiency

Computational evidence

Protein change
AlphaMissense	0.106	likely benign
REVEL	0.157	moderately benign-leaning
SaProt	LLR -4.51	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.2	GERP -0.33, phastCons 1
Overall
CADD	15.59	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

Grpmax group 0.00333% Admixed American · 2/60,030 alleles

Filtering AF 0.00111% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0009%

Overall 0.0015% 22/1,461,880 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00333%	30,015
European (non-Finnish)	0.00169%	59,001

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: PSAP
Protein: p.Arg232Leu
Coding: c.695G>T
MANE Select: NM_002778
dbSNP: rs147265566
Type: single nucleotide variant
Location: chr10:71828039 (GRCh38)
Gene constraint: LOEUF 0.507 · pLI 0.95 (gnomAD)
Structure: AlphaFold pLDDT 73.90 · 21 PDB
Residue 232: the saposin b-type 2 domain; a disulfide bond; an α-helix

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

Disease context

metachromatic leukodystrophy due to saposin B deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Metachromatic leukodystrophy (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Childhood, Infancy
Prevalence: 1-9 / 100 000 (Europe)

Similar variants

PSAP p.Arg232His Uncertain significance ★★ ⚠ same residue
PSAP p.Arg232Cys Uncertain significance ★ ⚠ same residue
PSAP c.1005+1G>A Pathogenic/Likely pathogenic ★★ same condition
PSAP c.375+1G>T Likely pathogenic ★★ same condition
PSAP c.576+1G>A Likely pathogenic ★★ same condition
PSAP c.577-1G>T Pathogenic ★★ same condition
PSAP c.721-1G>A Likely pathogenic ★★ same condition
PSAP p.Asn215His 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/psap-p-arg232leu (accessed [today's date]).

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