Human Molecular Genetics, Vol 5, 1737-1742, Copyright © 1996 by Oxford University Press
B Levinson, R Conant, R Schnur, S Das, S Packman and J Gitschier
Occipital horn syndrome (OHS), an X-linked connective tissue disorder, has
recently been shown to result from mutations in the Menkes disease gene
(MNK), which encodes a copper-transporting ATPase. By Southern analysis we
detected a small deletion in a region 5' to the MNK gene in one patient
with OHS. Genomic clones from an unaffected individual were isolated and
sequenced, revealing three tandem 98 bp repeats situated upstream of the
reported transcription start site, and analysis of the patient's DNA showed
a deletion of one of the repeats. The deletion is likely to be responsible
for the disease in this patient, as it was not observed in 110 unaffected
individuals analyzed, and no other mutation in the patient was detected by
RT-PCR and chemical cleavage mismatch analysis or by cDNA sequence
analysis. The deletion is associated with a dramatic decrease in expression
of a chloramphenicol acetyltransferase reporter gene, implicating the
repeat sequences in regulation of MNK expression, although a quantitative
analysis of MNK mRNA from a cell line derived from the patient shows no
detectable reduction. Other experiments revealed no effect on the site of
transcription initiation, termination or on splicing.
ARTICLES
A repeated element in the regulatory region of the MNK gene and its deletion in a patient with occipital horn syndrome
Howard Hughes Medical Institute, University of California, San Francisco 94143, USA.
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