Is CLPB p.Arg332= (c.996G>A) pathogenic?

CLPB p.Arg332= (c.996G>A) is classified Benign/Likely benign in CLPB (ClinVar, Multiple submitters, 7 submitters; last evaluated 2026-06-01). Rare (popmax 0.935%, nfe); Associated with 3-methylglutaconic aciduria, type VIIB.

What condition is associated with CLPB p.Arg332= (c.996G>A)?

CLPB p.Arg332= (c.996G>A) is associated with 3-methylglutaconic aciduria, type VIIB (ClinVar).

How common is CLPB p.Arg332= (c.996G>A) in the general population?

CLPB p.Arg332= (c.996G>A) is rare (popmax 0.935%, nfe) (gnomAD).

CLPB p.Arg332=

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.996G>A · rs146912721 · VCV382370

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 7 submitters

gnomAD v4.1

Rare

rare (popmax 0.935%, nfe)

Conditions

3-methylglutaconic aciduria, type VIIB

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.348	indeterminate
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.7	GERP 1.6, phastCons 1
Overall
CADD	12.13	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.935% European (non-Finnish) · 11,031/1,179,888 alleles

Filtering AF 0.92% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.914%

Overall 0.834% 13,453/1,614,034 alleles · rare

Ancestry group	Frequency	1 in
Amishnot grpmax-eligible	4.39%	23
Finnishnot grpmax-eligible	2.14%	47
European (non-Finnish)grpmax	0.935%	107
Remaining individualsnot grpmax-eligible	0.72%	139
Admixed American	0.28%	357
South Asian	0.232%	432
Ashkenazi Jewishnot grpmax-eligible	0.223%	449
African / African-American	0.152%	658
Middle Eastern	0.0495%	2,021

Amish 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.Arg332=
Coding: c.996G>A
MANE Select: NM_001258392
dbSNP: rs146912721
Type: single nucleotide variant
Location: chr11:72308597 (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.Arg332Gln Uncertain significance ★★ ⚠ 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-arg332 (accessed [today's date]).

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