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. 1985 Apr;5(4):762–767. doi: 10.1128/mcb.5.4.762

Transient expression of human adenosine deaminase cDNAs: identification of a nonfunctional clone resulting from a single amino acid substitution.

S H Orkin, S C Goff, W N Kelley, P E Daddona
PMCID: PMC366780  PMID: 3838797

Abstract

Human adenosine deaminase (ADA) is an important purine catabolic enzyme which irreversibly deaminates adenosine and deoxyadenosine. Severe genetic deficiency of ADA leads to an immunological deficiency state in which T-lymphoid cells are selectively destroyed by the accumulation of toxic levels of deoxyadenosine and deoxy-ATP. In preparation for transfer of ADA sequences into a variety of cell types, we explored expression of ADA cDNAs transfected into cultured cells within a simian virus 40-based expression vector. After transfection into monkey kidney (COS) cells, ADA cDNA encompassing the entire coding region of the protein generated human ADA activity. An unexpected finding, however, was the identification of a cDNA clone that failed to produce either human enzyme activity or immunoreactive ADA protein. As this pattern is typical of many naturally occurring mutant ADA alleles, we characterized the molecular defect in this clone. DNA sequence analysis revealed a single nucleotide substitution in amino acid position 50 (glycine-valine). Northern blotting with a unique 17-mer oligonucleotide demonstrated the absence of the mutant sequence in the mRNA from which the cDNA library giving rise to the mutant cDNA was constructed. Therefore, the substitution in the variant cDNA was created during cloning. These data define one critical region of the human ADA protein molecule and suggest a convenient strategy for characterization of the phenotypes associated with naturally occurring mutant alleles.

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Selected References

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