Document Detail

Mutations in ACY1, the gene encoding aminoacylase 1, cause a novel inborn error of metabolism.
MedLine Citation:
PMID:  16465618     Owner:  NLM     Status:  MEDLINE    
N-terminal acetylation of proteins is a widespread and highly conserved process. Aminoacylase 1 (ACY1; EC 3.5.14) is the most abundant of the aminoacylases, a class of enzymes involved in hydrolysis of N-acetylated proteins. Here, we present four children with genetic deficiency of ACY1. They were identified through organic acid analyses using gas chromatography-mass spectrometry, revealing increased urinary excretion of several N-acetylated amino acids, including the derivatives of methionine, glutamic acid, alanine, leucine, glycine, valine, and isoleucine. Nuclear magnetic resonance spectroscopy analysis of urine samples detected a distinct pattern of N-acetylated metabolites, consistent with ACY1 dysfunction. Functional analyses of patients' lymphoblasts demonstrated ACY1 deficiency. Mutation analysis uncovered recessive loss-of-function or missense ACY1 mutations in all four individuals affected. We conclude that ACY1 mutations in these children led to functional ACY1 deficiency and excretion of N-acetylated amino acids. Questions remain, however, as to the clinical significance of ACY1 deficiency. The ACY1-deficient individuals were ascertained through urine metabolic screening because of unspecific psychomotor delay (one subject), psychomotor delay with atrophy of the vermis and syringomyelia (one subject), marked muscular hypotonia (one subject), and follow-up for early treated biotinidase deficiency and normal clinical findings (one subject). Because ACY1 is evolutionarily conserved in fish, frog, mouse, and human and is expressed in the central nervous system (CNS) in human, a role in CNS function or development is conceivable but has yet to be demonstrated. Thus, at this point, we cannot state whether ACY1 deficiency has pathogenic significance with pleiotropic clinical expression or is simply a biochemical variant. Awareness of this new genetic entity may help both in delineating its clinical significance and in avoiding erroneous diagnoses.
Jorn Oliver Sass; Verena Mohr; Heike Olbrich; Udo Engelke; Judit Horvath; Manfred Fliegauf; Niki Tomas Loges; Susanne Schweitzer-Krantz; Ralf Moebus; Polly Weiler; Andreas Kispert; Andrea Superti-Furga; Ron A Wevers; Heymut Omran
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Publication Detail:
Type:  Journal Article     Date:  2006-01-18
Journal Detail:
Title:  American journal of human genetics     Volume:  78     ISSN:  0002-9297     ISO Abbreviation:  Am. J. Hum. Genet.     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-02-08     Completed Date:  2006-04-25     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0370475     Medline TA:  Am J Hum Genet     Country:  United States    
Other Details:
Languages:  eng     Pagination:  401-9     Citation Subset:  IM    
Department of General Pediatrics and Adolescent Medicine, University Children's Hospital Freiburg, Freiburg, Germany.
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MeSH Terms
Amidohydrolases / deficiency,  genetics*
Amino Acid Metabolism, Inborn Errors / genetics*
Amino Acid Sequence
Amino Acids / metabolism*,  urine
Blotting, Northern
Conserved Sequence
Molecular Sequence Data
Sequence Alignment
Reg. No./Substance:
0/Amino Acids; EC 3.5.-/Amidohydrolases; EC I

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