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The presentation of patient with SPCD can be incredibly varied, from asymptomatic to lethal cardiac manifestations. [5] Early cases were reported with liver dysfunction, muscular findings (weakness and underdevelopment), hypoketotic hypoglycemia, cardiomegaly, cardiomyopathy and marked carnitine deficiency in plasma and tissues, combined with increased excretion in urine. [5]
Carnitine deficiency is found in about 50% of cases. [18] Over 90% of those diagnosed with 3-Methylcrotonyl-CoA carboxylase deficiency by newborn screening remain asymptomatic. The medical abnormalities that present in the few who do show symptoms are not always clearly related to 3-Methylcrotonyl-CoA carboxylase deficiency. [5]
Methylmalonic acidemia has an autosomal recessive pattern of inheritance.. Methylmalonic acidemias have an autosomal recessive inheritance pattern, which means the defective gene is located on an autosome, and two copies of the gene—one from each parent—must be inherited to be affected by the disorder.
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]
Beta-ketothiolase deficiency is a rare, autosomal recessive metabolic disorder in which the body cannot properly process the amino acid isoleucine or the products of lipid breakdown. [1] [2] Along with SCOT deficiency, it belongs to a group of disorders called ketone utilisation disorders.
Carnitine-acylcarnitine translocase deficiency has an autosomal recessive pattern of inheritance. Carnitine-acylcarnitine translocase deficiency is a rare, autosomal recessive metabolic disorder that prevents the body from converting long-chain fatty acids into energy, particularly during periods without food. [ 1 ]
Carnitine palmitoyltransferase II deficiency, sometimes shortened to CPT-II or CPT2, is an autosomal recessively inherited genetic metabolic disorder characterized by an enzymatic defect that prevents long-chain fatty acids from being transported into the mitochondria for utilization as an energy source. The disorder presents in one of three ...
glucosyltransferase I deficiency causes ALG6-CDG (CDG-Ic) [22] glucosyltransferase II deficiency causes ALG8-CDG (CDG-Ih). [23] Glc3Man9GlcNAc2-PP-Dol A protein with hitherto unknown activity, MPDU-1, is required for the efficient presentation of Dol-P-Man and Dol-P-Glc. Its deficiency causes MPDU1-CDG (CDG-If). [24]