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Ectodermal syndecan-2 mediates left-right axis formation in migrating mesoderm as a cell-nonautonomous Vg1 cofactor
Kenneth L Kramer1, H Joseph Yost
1Huntsman Cancer Institute, Center for Children, Department of Oncological Sciences and Department of Pediatrics, University of Utah, 2000 Circle of Hope, Salt Lake City, UT 84112, USA.
Developmental Cell
|January 10, 2002
Summary
Syndecan-2 in Xenopus ectoderm transmits left-right developmental signals independently of fibronectin, guiding heart and gut formation. This protein is crucial for early embryonic patterning and cell communication.
Area of Science:
- Developmental Biology
- Cell Biology
- Molecular Biology
Background:
- Heparan sulfate proteoglycans (HSPGs) in Xenopus ectoderm are key for left-right axis determination.
- Previous studies suggested HSPGs transmit crucial left-right information to developing organs.
Purpose of the Study:
- To investigate the specific role of syndecan-2 in mediating left-right patterning in Xenopus embryos.
- To determine if syndecan-2's function in situs determination is linked to fibronectin fibrillogenesis.
- To elucidate the mechanism by which syndecan-2 transmits left-right information.
Main Methods:
- Utilized a novel in vivo enterokinase approach for syndecan-2 functional analysis.
- Examined syndecan-2's role in cardiac and visceral situs determination.
- Investigated the dependence of left-right development on specific glycosaminoglycan attachment sites on syndecan-2.
Main Results:
- Syndecan-2 functions in ectoderm to mediate cardiac and visceral situs, preceding known asymmetric gene expression.
- Syndecan-2's role in situs determination is independent of its fibronectin fibrillogenesis activity.
- Specific glycosaminoglycan attachment sites on syndecan-2 are essential for left-right development.
Conclusions:
- Ectodermal syndecan-2 plays a cell-nonautonomous role in transmitting left-right information to migrating mesoderm.
- Syndecan-2 acts upstream of known asymmetric gene expression pathways.
- The function of syndecan-2 in left-right patterning may involve Vg1-related signal transduction.