Abstract
Hypoxanthine-guanine phosphoribosyltransferase (HPRT; EC2.4.2.8), which functions in the metabolic salvage of purines, is encoded by an X-linked gene in man. Partial HPRT deficiencies are associated with gouty arthritis, while absence of activity results in Lesch-Nyhan syndrome (L-N). L-N patients fail to reproduce and the heterozygous state appears to confer no selective advantage1. Thus, Haldane's principle2 predicts that new mutations at the hprt locus must occur frequently in order for L-N syndrome to be maintained in the population. This constant introduction of new mutations would be expected to result in a heterogeneous collection of genetic lesions, some of which may be novel1. As we report here, the mutations in the hprt gene of seven L-N patients, selected from an initial survey of 28 patients, have been characterized and all were found to be distinctly different, as predicted. The origin of one unusual mutation has been identified by analysis of DNA from four generations of family members. Further molecular analysis of the origin of new mutations at the hprt locus should aid in resolving the issue of an apparent difference in the frequency of hprt mutations in males and females3–5.
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Yang, T., Patel, P., Chinault, A. et al. Molecular evidence for new mutation at the hprt locus in Lesch-Nyhan patients. Nature 310, 412–414 (1984). https://doi.org/10.1038/310412a0
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DOI: https://doi.org/10.1038/310412a0
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