Related Experiment Videos
Developmental anomalies of Xenopus embryos following microinjection of SPARC antibodies
L Purcell1, J Gruia-Gray, S Scanga
1Department of Zoology, University of Toronto, Ontario, Canada.
Abstract:
The function of SPARC (Secreted Protein, Acidic, Rich in Cysteine) in early embryonic development was assayed by microinjecting affinity-purified antibodies directed against SPARC into the blastocoel cavity of Xenopus embryos. Microinjection of SPARC antibodies did not appear to interfere with development until late neurulation. By hatching, a broad spectrum of external developmental anomalies were observable, including bent embryonic axes, accentuated ventral masses, shortened embryonic axes, and lack of visible eye pigment. Histological sections of injected embryos demonstrated that lack of visible eye pigmentation was often associated with deformities in eye development. Bending and shortening of the embryonic axis was associated with highly disorganized myotome patterns and loss of segmental boundaries. The results indicate a requirement for SPARC in the early morphological development of several tissues in Xenopus.
Insights
Secreted Protein, Acidic, Rich in Cysteine (SPARC) is crucial for early Xenopus embryonic development. Antibodies against SPARC caused developmental anomalies, including axis bending and eye deformities, indicating its essential role.
Area of Science:
- Developmental Biology
- Molecular Biology
Background:
- Secreted Protein, Acidic, Rich in Cysteine (SPARC) is a matricellular protein implicated in various biological processes.
- Its specific role in early embryonic morphogenesis remains to be fully elucidated.
Purpose of the Study:
- To investigate the function of SPARC during early embryonic development in Xenopus.
- To determine the consequences of SPARC inhibition on embryonic morphology and tissue development.
Main Methods:
- Microinjection of affinity-purified anti-SPARC antibodies into Xenopus blastocoel.
- Observation of external morphology from early development to hatching.
- Histological analysis of key developmental tissues in injected embryos.
Main Results:
- SPARC antibody injection did not affect development until late neurulation.
- Significant external anomalies observed by hatching, including bent and shortened embryonic axes, and lack of eye pigmentation.
- Histology revealed eye developmental deformities and disorganized myotome patterns with loss of segmental boundaries.
Conclusions:
- SPARC is essential for normal morphological development in Xenopus embryos.
- SPARC plays a critical role in the development of multiple tissues, including the eye and axial structures.
- These findings highlight SPARC's importance in regulating early embryonic patterning and tissue organization.