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A disintegrin and metalloprotease 17 (ADAM17), also called TACE (tumor necrosis factor-α-converting enzyme), is a 70-kDa enzyme that belongs to the ADAM protein family of disintegrins and metalloproteases, activated by substrate presentation.
The prognosis is poor in this condition, [3] and most children die before the age of 10. [4] However, some survive to adulthood, especially if they have a non-classical (mild) form of RCDP. [4] Children with classical, or severe, RCDP1 have severe developmental disabilities.
ADAMs (short for a disintegrin and metalloproteinase) are a family of single-pass transmembrane and secreted metalloendopeptidases. [1] [2] All ADAMs are characterized by a particular domain organization featuring a pro-domain, a metalloprotease, a disintegrin, a cysteine-rich, an epidermal-growth factor like and a transmembrane domain, as well as a C-terminal cytoplasmic tail. [3]
MICPCH in males may occur with or without severe epileptic encephalopathy (Ohtahara syndrome, West syndrome, or early myoclonic epilepsy) in addition to severe-to-profound developmental delay. When seizures are present, they occur early and may be intractable. [7] Prognosis is poor for males with this condition. [8]
Reduced life expectancy Maroteaux–Lamy syndrome , or Mucopolysaccharidosis Type VI (MPS-VI) , is an inherited disease caused by a deficiency in the enzyme arylsulfatase B (ARSB). [ 3 ] ASRB is responsible for the breakdown of large sugar molecules called glycosaminoglycans (GAGs, also known as mucopolysaccharides).
Diagnosis typically occurs during infancy or early childhood and is based around physical characteristics and symptoms. X-rays may reveal abnormal development of the bulbous ends of the metaphyses of the limb bones. Tests that detect hypercalciuria and hypercalcaemia are also helpful in the diagnosis. [5] [6]
Progeria is a specific type of progeroid syndrome, also known as Hutchinson–Gilford syndrome or Hutchinson–Gilford progeroid syndrome (HGPS). [8] A single gene mutation is responsible for causing progeria. The affected gene, known as lamin A (LMNA), makes a protein necessary for holding the cell nucleus together.
During the next 15 years the underlying defect remained unknown but since the plasmaprotein transferrin was underglycosylated (as shown by e.g. isoelectric focusing), the new syndrome was named carbohydrate-deficient glycoprotein syndrome (CDGS) [1] Its "classic" phenotype included psychomotor retardation, ataxia, strabismus, anomalies (fat ...