1-Methyladenine in urine of an adenosine deaminase-deficient adult without immunodeficiency.

Procedures are described for the isolation and identification of 1-methyladenine from the urine of an adult female with adenosine deaminase deficiency but no immunodeficiency. Evidence is provided indicating that much of the usual urinary excretion product, 1-methyladenosine, is converted to 1-methyladenine in this subject prior to excretion. Since the nucleoside phosphorylases present in normal individuals do not act on 1-methyladenosine, this suggests that a phosphorylase with unusual properties is present in this adenosine deaminase-deficient subject. A possible role for this phosphorylase in removal of deoxyadenosine in this subject is discussed.