Abstract
A complete human APRT gene has been isolated from a lambda phage genomic library using cloned mouse APRT DNA as a probe. The human gene, contained in a recombinant lambda phage designated λHuap15, is functional by virtue of its capacity to transfer human APRT activity to Aprt− mouse recipient cells after phage-mediated transfection. Digestion of λHuap15 DNA with BamH1 generated a 2.2-kb fragment that is the only fragment of eight produced to hybridize with the mouse APRT gene. This 2.2-kb BamH1 fragment is a unique, single copy sequence, and has been used to identify a restriction fragment length polymorphism (RFLP) associated with the APRT locus. Taq1 digestion and Southern blot analysis of DNAs from 49 unrelated individuals produced three different patterns. DNAs of 30 individuals produced a restriction pattern of three labeled fragments about 500 bp, 600 bp, and 2.1 kb in size, which is characteristic for individuals homozygous for the more common allele. Two individuals homozygous for the less frequent allele displayed labeled fragments of 500 bp and 2.7 kb. The remaining 17 DNA samples produced all four labeled bands as expected for heterozygous individuals. The frequency of heterozygotes in the population is about 35%, while the frequency of the less common allele is about 0.21. Restriction enzyme analysis of DNAs from two APRT-deficient brothers and from an unrelated heterozygote revealed no gross deletions or rearrangements, nor the Taq1 polymorphism.
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Stambrook, P.J., Dush, M.K., Trill, J.J. et al. Cloning of a functional human adenine phosphoribosyltransferase (APRT) gene: Identification of a restriction fragment length polymorphism and preliminary analysis of DNAs from APRT-deficient families and cell mutants. Somat Cell Mol Genet 10, 359–367 (1984). https://doi.org/10.1007/BF01535631
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DOI: https://doi.org/10.1007/BF01535631