Is MCCC2 p.Pro224= (c.672T>C) pathogenic?

MCCC2 p.Pro224= (c.672T>C) is classified Likely benign in MCCC2 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-01-13). Absent from gnomAD v4.1; Associated with 3-methylcrotonyl-CoA carboxylase 2 deficiency.

What condition is associated with MCCC2 p.Pro224= (c.672T>C)?

MCCC2 p.Pro224= (c.672T>C) is associated with 3-methylcrotonyl-CoA carboxylase 2 deficiency (ClinVar).

How common is MCCC2 p.Pro224= (c.672T>C) in the general population?

MCCC2 p.Pro224= (c.672T>C) is absent from gnomAD v4.1 (gnomAD).

How is 3-methylcrotonyl-CoA carboxylase deficiency inherited?

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

MCCC2 p.Pro224=

c.672T>C · rs1337800475 · VCV1148977

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

3-methylcrotonyl-CoA carboxylase 2 deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.5	GERP 2.7, phastCons 0.19
Overall
CADD	5.441	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: MCCC2
Protein: p.Pro224=
Coding: c.672T>C
MANE Select: NM_022132
dbSNP: rs1337800475
Type: single nucleotide variant
Location: chr5:71626687 (GRCh38)
Gene constraint: LOEUF 0.832 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.82 · 14 PDB
Residue 224: the coa carboxyltransferase n-terminal domain; a UniProt-annotated variant site (in mcc2d); the 'carboxyltransferase' region; an α-helix

Full MCCC2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

3-methylcrotonyl-CoA carboxylase 2 deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For 3-methylcrotonyl-CoA carboxylase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages
Prevalence: 1-9 / 100 000 (Europe)

Similar variants

MCCC2 p.Pro224Leu Likely pathogenic ★ same residue
MCCC2 p.Pro224Thr Pathogenic ★ same residue
MCCC2 p.Pro224Arg Uncertain significance ★ ⚠ same residue
MCCC2 p.Pro224Ser Uncertain significance ⚠ same residue
MCCC2 c.1000-2A>G Likely pathogenic ★★ same condition
MCCC2 c.1072+1G>A Likely pathogenic ★★ same condition
MCCC2 c.1149+1G>A Pathogenic/Likely pathogenic ★★ same condition
MCCC2 c.1149+1G>T 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/mccc2-p-pro224 (accessed [today's date]).

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