Abstract:
:In a female infant with dysmorphic features, severe neurological defects, and congenital blindness, a positive urinary Bratton-Marshall test led to identification of a massive excretion of 5-amino-4-imidazolecarboxamide (AICA)-riboside, the dephosphorylated counterpart of AICAR (also termed "ZMP"), an intermediate of de novo purine biosynthesis. ZMP and its di- and triphosphate accumulated in the patient's erythrocytes. Incubation of her fibroblasts with AICA-riboside led to accumulation of AICAR, not observed in control cells, suggesting impairment of the final steps of purine biosynthesis, catalyzed by the bifunctional enzyme AICAR transformylase/IMP cyclohydrolase (ATIC). AICAR transformylase was profoundly deficient, whereas the IMP cyclohydrolase level was 40% of normal. Sequencing of ATIC showed a K426R change in the transformylase region in one allele and a frameshift in the other. Recombinant protein carrying mutation K426R completely lacks AICAR transformylase activity.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Marie S,Heron B,Bitoun P,Timmerman T,Van Den Berghe G,Vincent MFdoi
10.1086/421475subject
Has Abstractpub_date
2004-06-01 00:00:00pages
1276-81issue
6eissn
0002-9297issn
1537-6605pii
S0002-9297(07)62854-7journal_volume
74pub_type
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