Is CLPB p.Ala323Ser (c.967G>T) pathogenic?

CLPB p.Ala323Ser (c.967G>T) is classified Uncertain significance in CLPB (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-07-02). AlphaMissense: ambiguous (0.5367); Very rare (popmax 0.0011%, sas); Associated with 3-methylglutaconic aciduria, type VIIB.

What condition is associated with CLPB p.Ala323Ser (c.967G>T)?

CLPB p.Ala323Ser (c.967G>T) is associated with 3-methylglutaconic aciduria, type VIIB (ClinVar).

How common is CLPB p.Ala323Ser (c.967G>T) in the general population?

CLPB p.Ala323Ser (c.967G>T) is very rare (popmax 0.0011%, sas) (gnomAD).

What do computational predictors say about CLPB p.Ala323Ser (c.967G>T)?

AlphaMissense predicts ambiguous (score 0.5367) — an in-silico prediction, not a clinical call.

CLPB p.Ala323Ser

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.967G>T · rs759050719 · VCV2127659

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

ambiguous

0.5367 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0011%, sas)

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

3-methylglutaconic aciduria, type VIIB

Computational evidence

Protein change
AlphaMissense	0.5367	ambiguous
REVEL	0.188	benign-leaning
SaProt	LLR -10.78	damaging
⇒ SaProt calls this damaging; REVEL does not; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6	GERP 1.8, phastCons 1
Regional constraint	o/e 0.54	unconstrained · MANE · 22 kb · p 2.6e-09 · regional, not allelic
Overall
CADD	27.1	PHRED · no single calibrated threshold — expert panels disagree

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

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM A353S vs ClinVar A323S) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0011% South Asian · 1/90,702 alleles

Overall 6.86e-05% 1/1,458,762 alleles · very rare

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.Ala323Ser
Coding: c.967G>T
MANE Select: NM_001258392
dbSNP: rs759050719
Type: single nucleotide variant
Location: chr11:72317127 (GRCh38)
Gene constraint: LOEUF 0.643 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.52 · 7 PDB
Residue 323: 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.Ala323Thr 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
CLPB p.Arg378Gly 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-ala323ser (accessed [today's date]).

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