Human Molecular Genetics, Vol 7, 847-853, Copyright © 1998 by Oxford University Press
R Ofman, EH Hettema, EM Hogenhout, U Caruso, AO Muijsers and RJ Wanders
Rhizomelic chondrodysplasia punctata (RCDP) is a genetic disorder which is
clinically characterized by rhizomelic shortening of the upper extremities,
typical dysmorphic facial appearance, congenital contractures and severe
growth and mental retardation. Patients with RCDP can be subdivided into
three subgroups based on biochemical analyses and complementation studies.
The largest subgroup contains patients with mutations in the PEX7 gene
encoding the PTS2 receptor. This results in multiple peroxisomal
abnormalities which includes a deficiency of
acyl-CoA:dihydroxyacetonephosphate acyltransferase (DHAPAT),
alkyl-dihydroxyacetonephosphate synthase (alkyl-DHAP synthase), peroxisomal
3-ketoacyl-CoA thiolase and phytanoyl-CoA hydroxylase, although there are
differences in the extent of the deficiencies observed. Patients in the two
other subgroups have been reported to be either deficient in the activity
of DHAPAT (RCDP type 2) or alkyl-DHAP synthase (RCDP type 3) while no other
abnormalities could be observed. To examine whether the gene encoding
DHAPAT is mutated in patients with RCDP type 2, we determined the
N-terminal amino acid sequence of the enzyme isolated from human placenta.
Using this sequence as a query, we identified a 2040 bp open reading frame
(ORF) in the human database of expressed sequence tags. Expression of this
ORF in the yeast Saccharomyces cerevisiae showed that we have identified
the DHAPAT cDNA. The deduced amino acid sequence revealed no PTS2 consensus
sequence. In contrast DHAPAT appears to contain a putative PTS1 at the
extreme C-terminus. All RCDP type 2 patients analyzed were found to contain
mutations in their DHAPAT cDNA. This demonstrates that RCDP type 2 is the
result of mutations in DHAPAT.
ARTICLES
Acyl-CoA:dihydroxyacetonephosphate acyltransferase: cloning of the human cDNA and resolution of the molecular basis in rhizomelic chondrodysplasia punctata type 2
Department of Clinical Chemistry, Academic Medical Centre, University of Amsterdam, The Netherlands.
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