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Vol. 10, Issue 10, 3205-3221, October 1999
Department of Zoology, University of British Columbia,
Vancouver, British Columbia, Canada, V6T 1Z4
The unc-52 gene encodes the nematode homologue of
mammalian perlecan, the major heparan sulfate proteoglycan of the
extracellular matrix. This is a large complex protein with
regions similar to low-density lipoprotein receptors, laminin, and
neural cell adhesion molecules (NCAMs). In this study, we extend our
earlier work and demonstrate that a number of complex isoforms of this
protein are expressed through alternative splicing. We identified three major classes of perlecan isoforms: a short form lacking the NCAM region and the C-terminal agrin-like region; a medium form containing the NCAM region, but still lacking the agrin-like region; and a newly
identified long form that contains all five domains present in
mammalian perlecan. Using region-specific antibodies and
unc-52 mutants, we reveal a complex spatial and temporal
expression pattern for these UNC-52 isoforms. As well, using a series
of mutations affecting different regions and thus different isoforms of
UNC-52, we demonstrate that the medium NCAM-containing isoforms are
sufficient for myofilament lattice assembly in developing nematode
body-wall muscle. Neither short isoforms nor isoforms containing the
C-terminal agrin-like region are essential for sarcomere assembly or
muscle cell attachment, and their role in development remains unclear.
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