Is CPT1A p.His133Pro (c.398A>C) pathogenic?

CPT1A p.His133Pro (c.398A>C) is classified Uncertain significance in CPT1A (ClinVar, Single submitter, 1 submitter; last evaluated 2021-06-08). AlphaMissense: likely pathogenic (0.596); Absent from gnomAD v4.1; Associated with carnitine palmitoyl transferase 1A deficiency.

What condition is associated with CPT1A p.His133Pro (c.398A>C)?

CPT1A p.His133Pro (c.398A>C) is associated with carnitine palmitoyl transferase 1A deficiency (ClinVar).

How common is CPT1A p.His133Pro (c.398A>C) in the general population?

CPT1A p.His133Pro (c.398A>C) is absent from gnomAD v4.1 (gnomAD).

How is Carnitine palmitoyl transferase 1A deficiency inherited?

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

What do computational predictors say about CPT1A p.His133Pro (c.398A>C)?

AlphaMissense predicts likely pathogenic (score 0.596) — an in-silico prediction, not a clinical call.

CPT1A p.His133Pro

c.398A>C · rs2154000819 · VCV1468670

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.596 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

carnitine palmitoyl transferase 1A deficiency

Computational evidence

Protein change
AlphaMissense	0.596	likely pathogenic
REVEL	0.833	moderately pathogenic-leaning
SaProt	LLR -10.87	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	GERP 2.1, phastCons 1
Regional constraint	o/e 0.88	unconstrained · MANE · 11 kb · p 0.094 · regional, not allelic
Overall
CADD	27.6	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

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

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: CPT1A
Protein: p.His133Pro
Coding: c.398A>C
MANE Select: NM_001876
dbSNP: rs2154000819
Type: single nucleotide variant
Location: chr11:68807522 (GRCh38)
Gene constraint: LOEUF 0.709 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 92.55 · 1 PDB

Full CPT1A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

carnitine palmitoyl transferase 1A deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Carnitine palmitoyl transferase 1A deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

CPT1A p.His133= Likely benign ★ same residue
CPT1A c.1163+1G>A Pathogenic/Likely pathogenic ★★ same condition
CPT1A c.1163+2T>C Pathogenic/Likely pathogenic ★★ same condition
CPT1A c.1352+1G>C Likely pathogenic ★★ same condition
CPT1A c.1459-1G>A Likely pathogenic ★★ same condition
CPT1A c.1575+1G>T Likely pathogenic ★★ same condition
CPT1A c.2028+2T>G Likely pathogenic ★★ same condition
CPT1A c.281+1G>A 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/cpt1a-p-his133pro (accessed [today's date]).

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