Hypoxanthine Phosphoribosyltransferase. HGPRT . HPRTase . Hypoxanthine Guanine Phosphoribosyltransferase . Phosphoribosyltransferase, Guanine . Phosphoribosyltransferase, Hypoxanthine . Phosphoribosyltransferase, Hypoxanthine-Guanine . Pyrophosphorylase, IMP . Hypoxanthine-Guanine Phosphoribosyltransferase . IMP Pyrophosphorylase . Guanine Phosphoribosyltransferase . HPRT 5454 . An enzyme that catalyzes the conversion of 5-phosphoribosyl-1-pyrophosphate and hypoxanthine, guanine, or MERCAPTOPURINE to the corresponding 5'-mononucleotides and pyrophosphate. The enzyme is important in purine biosynthesis as well as central nervous system functions. Complete lack of enzyme activity is associated with the LESCH-NYHAN SYNDROME, while partial deficiency results in overproduction of uric acid. EC 2.4.2.8. . 0.73
/deficiency. Used with endogenous and exogenous substances which are absent or in diminished amount relative to the normal requirement of an organism or a biologic system. . 0.64
Tay-Sachs Disease. Amaurotic Familial Idiocy . B Variant GM2 Gangliosidosis . B Variant GM2-Gangliosidosis . Deficiency Disease Hexosaminidase A . Familial Amaurotic Idiocy . GM2 Gangliosidosis, B Variant . GM2 Gangliosidosis, Type 1 . GM2 Gangliosidosis, Type I . GM2-Gangliosidosis, Type I . Gangliosidosis GM2 , Type 1 . Gangliosidosis GM2, Type I . HexA Deficiency . Hexosaminidase A Deficiency . Hexosaminidase alpha-Subunit Deficiency (Variant B) . Sphingolipidosis, Tay-Sachs . Amaurotic Idiocy, Familial . B Variant GM2-Gangliosidoses . Deficiency, Hexosaminidase A . Deficiency, Hexosaminidase alpha-Subunit (Variant B) . GM2-Gangliosidosis, B Variant . Hexosaminidase alpha Subunit Deficiency (Variant B) . Sphingolipidosis, Tay Sachs . Tay Sachs Disease . Tay Sachs Disease, B Variant . Tay-Sachs Sphingolipidosis . Type I GM2-Gangliosidosis . Gangliosidosis G(M2), Type I . G(M2) Gangliosidosis, Type I . Gangliosidosis GM2, B Variant . Hexosaminidase A Deficiency Disease . Tay-Sachs Disease, B Variant . Amaurotic Familial Idiocy . Gangliosidosis GM2, Type I . An autosomal recessive neurodegenerative disorder characterized by the onset in infancy of an exaggerated startle response, followed by paralysis, dementia, and blindness. It is caused by mutation in the alpha subunit of the HEXOSAMINIDASE A resulting in lipid-laden ganglion cells. It is also known as the B variant (with increased HEXOSAMINIDASE B but absence of hexosaminidase A) and is strongly associated with Ashkenazic Jewish ancestry. . 0.56