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Pearson syndrome is a mitochondrial disease caused by a deletion in mitochondrial DNA (mtDNA). [3] An mtDNA is genetic material contained in the cellular organelle called the mitochondria. Depending on the tissue type, each cell contains hundreds to thousands of mitochondria. There are 2–10 mtDNA molecules in each mitochondrion.
Mitochondrial disease is a group of disorders caused by mitochondrial dysfunction. Mitochondria are the organelles that generate energy for the cell and are found in every cell of the human body except red blood cells. They convert the energy of food molecules into the ATP that powers most cell functions.
I-cell disease is an autosomal recessive disorder caused by a deficiency of GlcNAc phosphotransferase, which phosphorylates mannose residues to mannose-6-phosphate on N-linked glycoproteins in the Golgi apparatus within cells.
Cell damage (also known as cell injury) is a variety of changes of stress that a cell suffers due to external as well as internal environmental changes. Amongst other causes, this can be due to physical, chemical, infectious, biological, nutritional or immunological factors. Cell damage can be reversible or irreversible.
The mucopolysaccharidoses are part of the lysosomal storage disease family, a group of genetic disorders that result when the lysosome organelle in animal cells malfunctions. The lysosome can be thought of as the cell's recycling center because it processes unwanted material into other substances that the cell can utilize.
In I-cell disease, the inclusions form due to a defect in the sorting of enzymes to the lysosomes, where waste materials are broken down. This defect is caused by a mutation in the GNPTAB gene in the enzyme N-acetylglucosamine-1-phosphotransferase. [3] This leads to a failure to tag the lysosomal enzymes with mannose-6-phosphate. Without this ...
Lysosomal storage diseases (LSDs; / ˌ l aɪ s ə ˈ s oʊ m əl /) are a group of over 70 rare inherited metabolic disorders that result from defects in lysosomal function. [1] [2] Lysosomes are sacs of enzymes within cells that digest large molecules and pass the fragments on to other parts of the cell for recycling.
The other two disorders are neonatal adrenoleukodystrophy (NALD), and infantile Refsum disease (IRD). [5] [6] Although all have a similar molecular basis for disease, Zellweger syndrome is the most severe of these three disorders. [7] Zellweger syndrome is associated with impaired neuronal migration, neuronal positioning, and brain development. [4]
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