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Medium-chain acyl-CoA dehydrogenase deficiency (MCAD deficiency or MCADD) is a disorder of fatty acid oxidation that impairs the body's ability to break down medium-chain fatty acids into acetyl-CoA. The disorder is characterized by hypoglycemia and sudden death without timely intervention, most often brought on by periods of fasting or vomiting.
In addition to the fetal complications, they can also cause complications for the mother during pregnancy. [4] Examples include: Mitochondrial trifunctional protein deficiency (MTPD) [3] MCADD, LCHADD, and VLCADD [5] Schematic demonstrating mitochondrial fatty acid beta-oxidation and effects of LCHAD deficiency
Mast cell activation syndrome (MCAS) is a term referring to one of two types of mast cell activation disorder (MCAD); the other type is idiopathic MCAD. [1] MCAS is an immunological condition in which mast cells, a type of white blood cell, inappropriately and excessively release chemical mediators, such as histamine, resulting in a range of chronic symptoms, sometimes including anaphylaxis or ...
Problems related to 3-hydroxyacyl-coenzyme A dehydrogenase deficiency can be triggered by periods of fasting or by illnesses such as viral infections. This disorder is sometimes mistaken for Reye syndrome, a severe disorder that may develop in children while they appear to be recovering from viral infections such as chicken pox or flu. Most ...
The mutation is recessive, and often parents of children who have the deficiency can be diagnosed afterward as carriers. [3] In humans the most common naturally occurring mutation in MCAD is located at amino acid residue Lys-304. [1] The altered residue occurs as a result of a single-point mutation in which the lysine side chain is replaced by ...
Avoidance of fasting periods, high-fat diets, and dehydration is recommended for those who are affected. A diet consisting of low-fat intake and supplemental calories is common for management of VLCAD deficiency. If a metabolic crisis is not treated, a child with VLCAD can develop: breathing problems, seizures, coma, sometimes leading to death.
Diagnoses are typically made based on newborn screening done from blood obtained using a heel prick at birth. Prior to widespread inclusion of FAO (fatty acid oxidation) disorders in newborn screening tests, diagnosis typically occurred as a result of children presenting for medical attention having hypoglycemic hypoketotic crisis.
Looking at the molecular basis, two distinct homozygous mutations are found to cause malonic aciduria in human. The first mutation is the transversion of gene from C to G causing a premature stop signal in the protein. The second mutation is a base pair insertion in the mature RNA that will eventually result in the protein truncation. [4]