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IEMbase 0230: CPT2-related Carnitine palmitoyltransferase 2 deficiency

Scope

Field Value
IEMbase ID 230
Nosology 4.1.03.01
Gene CPT2
External IDs OMIM:255110
Generated mapping CANDIDATE; Carnitine_Palmitoyltransferase_II_Deficiency.yaml
Candidate DisMech targets Carnitine_Palmitoyltransferase_II_Deficiency.yaml
Review date 2026-07-07

IEMbase phenotype signal

IEMbase represents this as CPT2-related carnitine palmitoyltransferase 2 deficiency, with the alternate label carnitine palmitoyl-CoA transferase 2 deficiency. The record is autosomal recessive and treatability is marked unknown.

The biochemical rows include C16 and C18 long-chain acylcarnitines, free carnitine, C14:0, creatine kinase, transaminases, hypoketotic hypoglycemia context, dicarboxylic organic acids, and glucose. Clinical rows include brain and kidney malformations. Characteristic rows include cardiomyopathy, coma, muscular-axial hypotonia, lethargy, liver dysfunction, exercise-induced rhabdomyolysis, and skeletal myopathy. Treatments listed by IEMbase are fasting avoidance, carbohydrate-rich/long-chain-triglyceride-restricted diet, and L-carnitine supplements.

DisMech phenotype coverage

Carnitine_Palmitoyltransferase_II_Deficiency.yaml is the correct target. The local entry covers biallelic CPT2 disease, impaired inner-mitochondrial CPT II activity, long-chain acylcarnitine accumulation, decreased free carnitine, hypoketotic hypoglycemia, neonatal severe, infantile hepatic-cardiac, and myopathic phenotypes, cardiomyopathy, arrhythmia, liver dysfunction, myopathy, recurrent rhabdomyolysis, exercise intolerance, neuronal migration defects, renal cysts, fasting avoidance, dietary fat management, MCT context, and acute dextrose support.

Concordance and completeness

Judgement: accept generated candidate as correct file-level mapping with high concordance.

IEMbase and DisMech agree on CPT2 identity, carnitine-shuttle mechanism, long-chain acylcarnitine/free-carnitine abnormalities, hypoketotic crises, cardiac, hepatic, and skeletal-muscle involvement, exercise-induced rhabdomyolysis, and fasting/dietary management. IEMbase adds compact rows for L-carnitine supplementation and brain/kidney malformations; DisMech is richer for phenotype stratification and distinguishing CPT II disease from CPT1A and CACT.

Curation actions

  • Promote the candidate to a confirmed mapping: Carnitine_Palmitoyltransferase_II_Deficiency.yaml.
  • No new disease entry is needed.
  • Consider IEMbase malformation rows only after checking subtype-specific evidence.