Format

Send to:

Choose Destination
See comment in PubMed Commons below
Dev Genes Evol. 2002 Apr;212(3):124-33. Epub 2002 Mar 13.

Evolutionary conservation and association of SPARC with the basal lamina in Drosophila.

Author information

  • 1Department of Zoology, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada M5S 3G5.

Abstract

SPARC (secreted protein, acidic, rich in cysteine, also called BM40 and osteonectin) is a multifunctional calcium-binding glycoprotein whose modular organization has been highly conserved between invertebrates and vertebrates, indicating a conservation of function during metazoan evolution. Genome analysis has revealed a single copy of the DrosophilaSPARC ( dSPARC) gene. As a first step towards investigating the function of SPARC in Drosophila, we examined its spatiotemporal distribution during development. During embryogenesis, dSPARC mRNA transcripts are restricted to mesoderm derivatives, hemocytes, and the fat body. Immunostaining with anti- DrosophilaSPARC antibodies indicates that dSPARC secreted by the hemocytes and fat body cells is concentrated in basal laminae surrounding internal organs. During oogenesis, dSPARC transcripts are restricted to the somatic cells of the germarium and follicles. Consistent with embryonic development, the resultant protein is concentrated in basal laminae. Mutations in type IV collagen are associated with a dramatic decrease in dSPARC protein immunostaining in hemocytes. The data suggest that the production and assembly of dSPARC in the basal lamina is dependent on type IV collagen, and raise the possibility that dSPARC and type IV collagen interactions are a prerequisite to the assembly and structural integrity of basal laminae in Drosophila.

PMID:
11976950
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Springer
    Loading ...
    Write to the Help Desk