Abstract
The gene coding for the enzyme hypoxanthine-guanine phosphoribosyltransferase (HPRT; inosine monophosphate: pyrophosphate phosphoribosyltransferase, EC 2.4.2.8) has been the focus of considerable attention in somatic-cell mutation studies for a number of reasons. Seegmiller et al. (1967) demonstrated that the absence of, or deficiency in, HPRT within mammalian cells was the primary biochemical lesion in cells of patients suffering from Lesch-Nyhan syndrome (Lesch and Nyhan.1964) This disease is an inborn error of purine metabolism and is characterized by patients who are mentally retarded and prone to self-mutilation, spasticity and severe neurological dysfunction. These authors also proved that this disease is heritable in an X-linked recessive manner. Further studies have conclusively assigned this gene to the X chromosome of human (Pai et al. 1980), hamster (Westerveldt et al. 1972) and mouse (Franke and Taggart1980). The gene for HPRT is therefore hemizygous in male cells and functionally hemizygous in female cells, rendering the locus particularly amenable to the study of recessive mutation. Furthermore, in mammalian cells growing in culture HPRT is a non-essential enzyme (Sect. C); thus, there are few limitations on the types of mutation which can occur in this gene and permit the cell to survive. Well-defined selection systems have been developed which can select for growth of cells containing the enzyme while eliminating cells that do not, and vice versa (Sect. C). Thus, over the past 15 years there has been a considerable amount of analysis of the HPRT gene as a model system for investigating the mechanisms of mutation and drug resistance in mammalian cells. This chapter describes the HPRT selection system in detail and reviews the evidence that changes in the sequence and organisation of DNA within the HPRT gene lead to drug resistance.
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Brennand, J., Caskey, C.T. (1984). The Molecular Basis of Genetically Acquired Resistance to Purine Analogues in Cultured Mammalian Cells. In: Fox, B.W., Fox, M. (eds) Antitumor Drug Resistance. Handbook of Experimental Pharmacology, vol 72. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69490-5_5
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DOI: https://doi.org/10.1007/978-3-642-69490-5_5
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