Nucleic Acids Research, Vol 24, Issue 9 1646-1652, Copyright © 1996 by Oxford University Press
CL Dennis, JM Tinsley, AE Deconinck and KE Davies
Utrophin is a ubiquitously expressed cytoskeletal protein which is an
important structural component of the mammalian neuromuscular junction. It
shows extensive sequence similarity to dystrophin leading to postulation
that utrophin may be able to compensate for the absence of dystrophin in
Duchenne muscular dystrophy (DMD) patients. In order to study the
transcriptional control of utrophin expression including its regulation at
the neuromuscular junction, and as a first step in the development of a
potential DMD therapy, we have cloned the utrophin promoter region from
human and mouse. The utrophin promoter is associated with a CpG island at
the 5'-end of the gene, and sequence analysis of the 5'-UTR reveals several
Sp1 binding sites and the absence of TATA or CAAT motifs. Transcription is
initiated at one major and three minor sites. Using deletion constructs, we
have defined an active promoter region of 155 bp. The first exon and 900 bp
upstream display limited sequence conservation between human and mouse. The
core sequence TTCCGG of the N box which regulates synaptic expression of
other genes is also present and may be involved in regulating the specific
expression of utrophin at the postsynaptic membrane. This study provides
the basis for the understanding of the regulatory mechanism that controls
utrophin expression and provides the data needed to develop methods for the
upregulation of utrophin in DMD patients.
ARTICLES
Molecular and functional analysis of the utrophin promoter
Department of Biochemistry, University of Oxford, UK.
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