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Prior to expanded newborn screening, MCADD was an underdiagnosed cause of sudden death in infants. Individuals who have been identified prior to the onset of symptoms have an excellent prognosis. MCADD is most prevalent in individuals of Northern European Caucasian descent, with an incidence of 1:4000 to 1:17,000 depending on the population.
[2] [7] The symptoms of short-chain acyl-CoA dehydrogenase deficiency may be triggered during illnesses such as viral infections. In some cases, signs and symptoms may not appear until adulthood, when some individuals may develop muscle weakness, while other individuals mild symptoms may never be diagnosed. [2] [5]
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
By-products of fatty acid processing build up in tissues, which also contributes to the signs and symptoms of malonic aciduria. Malonic aciduria is inherited in an autosomal recessive pattern. [ 1 ] This means that the defective gene is located on an autosome (chromosome 16 is an autosome), and two copies of the defective gene - one inherited ...
As a result, these fatty acids are not converted into energy, which can lead to characteristic signs and symptoms of this disorder, such as lethargy and hypoglycemia. Levels of very long-chain fatty acids or partially degraded fatty acids may build up in tissues and can damage the heart, liver, and muscles, causing more serious complications.
Signs and symptoms [ edit ] Because of the enormous number of these diseases and the numerous systems negatively impacted, nearly every "presenting complaint" to a healthcare provider may have a congenital metabolic disease as a possible cause, especially in childhood and adolescence.
Typically, initial signs and symptoms of this disorder occur during infancy or early childhood and can include poor appetite, vomiting, diarrhea, lethargy, hypoglycemia, hypotonia, liver problems, and hyperinsulinism (high levels of insulin). Insulin controls the amount of sugar that moves from the blood into cells for conversion to energy.
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 ...