Is CLPB p.Arg224Trp (c.670C>T) pathogenic?

CLPB p.Arg224Trp (c.670C>T) is classified Conflicting classifications of pathogenicity in CLPB (ClinVar, Conflicting submitters, 4 submitters; last evaluated 2025-12-17). AlphaMissense: likely benign (0.0547); Very rare (popmax 0.00703%, nfe); Associated with 3-methylglutaconic aciduria, type VIIB.

What condition is associated with CLPB p.Arg224Trp (c.670C>T)?

CLPB p.Arg224Trp (c.670C>T) is associated with 3-methylglutaconic aciduria, type VIIB (ClinVar).

How common is CLPB p.Arg224Trp (c.670C>T) in the general population?

CLPB p.Arg224Trp (c.670C>T) is very rare (popmax 0.00703%, nfe) (gnomAD).

What do computational predictors say about CLPB p.Arg224Trp (c.670C>T)?

AlphaMissense predicts likely benign (score 0.0547) — an in-silico prediction, not a clinical call.

CLPB p.Arg224Trp

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.670C>T · rs149056885 · VCV843629

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 4 submitters

AlphaMissense

likely benign

0.0547 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00703%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

3-methylglutaconic aciduria, type VIIB

Computational evidence

Protein change
AlphaMissense	0.0547	likely benign
REVEL	0.021	moderately benign-leaning
SaProt	LLR -7.66	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>T here scores Δ0.28 · evaluated, not missing
Constraint at this position
Conservation	phyloP 5.8	GERP 0.67, phastCons 1
Regional constraint	o/e 1.01	unconstrained · MANE · 117 kb · p 0.91 · regional, not allelic
Overall
CADD	12.54	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00703% European (non-Finnish) · 83/1,179,998 alleles

Filtering AF 0.00579% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00533%

Overall 0.00545% 88/1,613,916 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00703%	14,217
Admixed American	0.00333%	29,994
Remaining individualsnot grpmax-eligible	0.0032%	31,242
South Asian	0.0011%	91,084

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.Arg224Trp
Coding: c.670C>T
MANE Select: NM_001258392 · reported on NM_030813
dbSNP: rs149056885
Type: single nucleotide variant
Location: chr11:72372991 (GRCh38)
Gene constraint: LOEUF 0.643 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 72.52 · 7 PDB

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.Arg224Gln Likely benign ★ 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-arg224trp (accessed [today's date]).

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