Is CLPB p.Cys126= (c.378C>T) pathogenic?

CLPB p.Cys126= (c.378C>T) is classified Likely benign in CLPB (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-08). Ultra-rare (popmax 0.0165%, mid); Associated with 3-methylglutaconic aciduria, type VIIB.

What condition is associated with CLPB p.Cys126= (c.378C>T)?

CLPB p.Cys126= (c.378C>T) is associated with 3-methylglutaconic aciduria, type VIIB (ClinVar).

How common is CLPB p.Cys126= (c.378C>T) in the general population?

CLPB p.Cys126= (c.378C>T) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

CLPB p.Cys126=

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.378C>T · rs2496011477 · VCV3020480

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

3-methylglutaconic aciduria, type VIIB

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>C here scores Δ0.39 · evaluated, not missing
Constraint at this position
Conservation	phyloP 7.3	GERP 0.47, phastCons 1
Overall
CADD	12.83	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,062 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000206% 3/1,459,156 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,062
European (non-Finnish)	0.000169%	590,002

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.Cys126=
Coding: c.378C>T
MANE Select: NM_001258392
dbSNP: rs2496011477
Type: single nucleotide variant
Location: chr11:72434097 (GRCh38)
Gene constraint: LOEUF 0.643 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.52 · 7 PDB
Residue 126: a functional site (cleavage; by parl); the 'autoinhibitory' region

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 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
CLPB p.Arg378Gly Pathogenic/Likely pathogenic ★★ same condition
CLPB p.Arg387Ter 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-cys126 (accessed [today's date]).

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