" /> Mitochondrial trifunctional protein deficiency 1 - CISMeF





Preferred Label : Mitochondrial trifunctional protein deficiency 1;

Symbol : MTPD1;

CISMeF acronym : MTPD;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Trifunctional protein deficiency; MTPD;

Included titles and symbols : Mitochondrial trifunctional protein deficiency 1 with myopathy and neuropathy;

Description : The mitochondrial trifunctional protein, composed of 4 alpha and 4 beta subunits, catalyzes 3 steps in mitochondrial beta-oxidation of fatty acids: long-chain 3-hydroxyacyl-CoA dehydrogenase (LCHAD), long-chain enoyl-CoA hydratase, and long-chain thiolase activities. Trifunctional protein deficiency is characterized by decreased activity of all 3 enzymes. Clinically, classic trifunctional protein deficiency can be classified into 3 main clinical phenotypes: neonatal onset of a severe, lethal condition resulting in sudden unexplained infant death (SIDS; 272120), infantile onset of a hepatic Reye-like syndrome, and late-adolescent onset of primarily a skeletal myopathy (Spiekerkoetter et al., 2003). Some patients with MTP deficiency show a protracted progressive course associated with myopathy, recurrent rhabdomyolysis, and sensorimotor axonal neuropathy. These patients tend to survive into adolescence and adulthood (den Boer et al., 2003). See also isolated LCHAD deficiency (609016), which is caused by mutation in the HADHA gene.;

Inheritance : Autosomal recessive;

Molecular basis : Caused by mutation in the alpha subunit of the hydroxyacyl-CoA dehydrogenase/3-ketoacyl-CoA thiolase/enoyl-CoA hydratase (HADHA, 600890.0003); Caused by mutation in the beta subunit of the hydroxyacyl-CoA dehydrogenase/3-ketoacyl-CoA thiolase/enoyl-CoA hydratase (HADHB, 143450.0001);

Laboratory abnormalities : Hypoketotic hypoglycemia; Decreased activity of long-chain 3-hydroxyacyl-CoA dehydrogenase, long-chain 3-oxoacyl-CoA thiolase, and long-chain 2-enoyl-CoA hydratase; Increased serum acylcarnitines; Hyperammonemia; Myoglobinuria; Abnormal liver enzymes;

Prefixed ID : #609015;

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20/05/2024


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