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Articles
Amino Acid Transport: Evidence for Genetic Control of Two Types in Human Kidney
1 DeBelle Laboratory for Biochemical Genetics, McGill-Montreal Children's Hospital Research Institute, Montreal 25, Quebec, Canada
A mutation affecting renal transport of proline, hydroxyproline, and glycerine occurs in man. In the presumed homozygote there is still significant residual transport of these compounds; however, this remaining function is saturated at normal concentrations of substrate in the plasma and is not inhibited by L-proline in the expected way. The presumed heterozygote has partial loss of a transport system common to the three substrates, which becomes saturated at high concentrations of substrate and is inhibited by L-proline. Two different types of transport systems are proposed: a common system and systems with lower capacity and greater specificity. The two types of transport appear to be controlled by separate genes.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)