A rare case of complete human erythrocyte AMP deaminase deficiency due to two novel missense mutations in AMPD3.


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Human erythrocyte AMP deaminase (AMPD3) deficiency is a clinically asymptomatic condition characterized by a 50% increase in steady-state levels of ATP in affected cells. The deficiency in Japanese is associated 75% of the time with the same mutation of R573C, and 25% of the time with other heterogeneous mutations of the AMPD3 gene. The heterozygote frequency was estimated at about 1/30. We previously reported five Japanese individuals who had a complete deficiency of AMPD3. Four were homozygotes for the major mutation of R573C; however, one female did not have the R573C allele. To clarify the mutations in her AMPD3 gene, we analyzed the AMPD3 gene and detected a minor mutation, W450R, derived from the mother and a novel mutation, Q712P, derived from the father. The expression study using AMPD3 cDNA containing both mutations showed that each mutation completely reduced the enzyme activity of AMPD3. As the frequency of carriers heterozygous for these mutations seems to be very low, identifying them may lead to a better understanding of the genetic background of populations in Japan. (C) 2000 Wiley-Liss, Inc.
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Key words
AMP deaminase deficiency,AMPD3,compound heterozygote,erythrocyte,Japanese
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