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A comparison of the kinetic properties of the common and rare variants of adenosine deaminase

Adenosine deaminase activity has been measured in red cells from individuals of known ADA phenotype (ADA 1, ADA 2‐1, ADA 3‐1, ADA 3‐2) using adenosine and 2′‐deoxyadenosine as substrates. No significant differences were observed among the phenotypes in their relative deaminase activity with the two substrates. However, evidence suggests the occurrence of an uncommon allele designated ADA1wdetermining low levels of ADA activity.