Is CLPB p.Arg332Gln (c.995G>A) pathogenic?

CLPB p.Arg332Gln (c.995G>A) is classified Uncertain significance in CLPB (ClinVar, Multiple submitters, 2 submitters; last evaluated 2023-06-09). AlphaMissense: likely pathogenic (0.9573); Very rare (popmax 0.00223%, eas); Associated with 3-methylglutaconic aciduria, type VIIB.

What condition is associated with CLPB p.Arg332Gln (c.995G>A)?

CLPB p.Arg332Gln (c.995G>A) is associated with 3-methylglutaconic aciduria, type VIIB (ClinVar).

How common is CLPB p.Arg332Gln (c.995G>A) in the general population?

CLPB p.Arg332Gln (c.995G>A) is very rare (popmax 0.00223%, eas) (gnomAD).

What do computational predictors say about CLPB p.Arg332Gln (c.995G>A)?

AlphaMissense predicts likely pathogenic (score 0.9573) — an in-silico prediction, not a clinical call.

CLPB p.Arg332Gln

Q: How is 3-methylglutaconic aciduria-neonatal cataract-neurologic involvement-congenital neutropenia syndrome inherited?

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

c.995G>A · rs759536311 · VCV2440149

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.9573 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00223%, eas)

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

3-methylglutaconic aciduria, type VIIB

Computational evidence

Protein change
AlphaMissense	0.9573	likely pathogenic
REVEL	0.389	indeterminate
SaProt	LLR -13.05	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	GERP 1.6, phastCons 1
Regional constraint	o/e 0.54	unconstrained · MANE · 22 kb · p 2.6e-09 · regional, not allelic
Overall
CADD	33.0	PHRED · no single calibrated threshold — expert panels disagree

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

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM R362Q vs ClinVar R332Q) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00223% East Asian · 1/44,884 alleles

Filtering AF 0.000292% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000211%

Overall 0.000889% 13/1,461,728 alleles · very rare

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.0032%	31,252
East Asiangrpmax	0.00223%	44,884
African / African-American	0.00133%	75,048
South Asian	0.0011%	91,076
European (non-Finnish)	0.000678%	147,486

Remaining individuals shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: CLPB
Protein: p.Arg332Gln
Coding: c.995G>A
MANE Select: NM_001258392
dbSNP: rs759536311
Type: single nucleotide variant
Location: chr11:72308598 (GRCh38)
Gene constraint: LOEUF 0.643 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.52 · 7 PDB
Residue 332: an α-helix

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

Disease context

3-methylglutaconic aciduria, type VIIB — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For 3-methylglutaconic aciduria-neonatal cataract-neurologic involvement-congenital neutropenia syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: Antenatal, Neonatal

Similar variants

CLPB p.Arg332= Benign/Likely benign ★★ same residue
CLPB p.Arg332Trp Uncertain significance ★ ⚠ same residue
CLPB c.1066+1G>A Pathogenic/Likely pathogenic ★★ same condition
CLPB c.455+1G>A Likely pathogenic ★★ same condition
CLPB c.873+1G>A Pathogenic/Likely pathogenic ★★ same condition
CLPB c.874-2A>G Likely pathogenic ★★ same condition
CLPB p.Arg178Ter Pathogenic ★★ same condition
CLPB p.Arg312Ter 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/clpb-p-arg332gln (accessed [today's date]).

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