Human Genetics

, Volume 93, Issue 3, pp 300–304

A 13 base pair deletion in exon 1 of HPRTIllinois forms a functional GUG initiation codon

  • Beverly L. Davidson
  • Nimrod Golovoy
  • Blake J. Roessler
Original Investigations


More than 50 mutations in the human hypoxanthine-guanine phosphoribosyltransferase (HPRT) locus have been described, yet only 2 alter the AUG initiation codon. One, variant HPRT1151, results in Lesch-Nyhan syndrome (LNS), and the other, HPRTIllinois, results in partial HPRT deficiency. Although previously undetectable, we used a sensitive gel assay to demonstrate that HPRTIllinois is not only active, but has a native Mr indistinguishable from normal. Confirmatory evidence of activity and native Mr is demonstrated following transfection of HPRT cells with expression plasmids containing cDNA sequences representing HPRTIllinois. These data provide support for the hypothesis that patient RT, or variant HPRTIllinois, is spared manifestations of the LNS as a result of translation at the newly formed GUG initiation codon.


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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Beverly L. Davidson
    • 1
  • Nimrod Golovoy
    • 1
  • Blake J. Roessler
    • 1
  1. 1.Department of Internal Medicine, Division of RheumatologyUniversity of MichiganAnn ArborUSA
  2. 2.Department of Internal MedicineUniversity of MichiganAnn ArborUSA

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