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. 1979 Sep;64(3):798–803. doi: 10.1172/JCI109526

Radioimmunochemical quantitation of human adenosine deaminase.

P E Daddona, M A Frohman, W N Kelley
PMCID: PMC372184  PMID: 468994

Abstract

Markedly reduced or absent adenosine deaminase activity in man is associated with an autosomal recesive form of severe conbined immunodeficiency disease. To further define the genetic nature of this enzyme defect, we have quantitated immunologically active adenosine deaminase (CRM) in the hemolysate of homozygous deficient patients and their heterozygous parents. A highly specific radioimmunoassay was developed capable of detecting 0.05% of normal erythrocyte adenosine deaminase. Hemolysates from nine heterozygotes (five families) showed a wide range in CRM (32--100% of normal) and variable absolute specific activities with several being at least 1 SD BELOW THE NORMAL MEAN. Hemolysates from four unrelated patients showed less than 0.09% adenosine deaminase activity with CRM ranging from less than 0.06 to 5.6% of the normal mean. In conclusion, heterozygote and homozygote hemolysates from five of the eight families analyzed revealed variable levels of CRM suggesting heterogeneous genetic alteration or expression of the silent or defective allele(s) of adenosine deaminase.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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