Sialoconjugates and development of the tail bud

Area of Science:

• Developmental Biology
• Embryology
• Glycobiology

Background:

• Previous lectin histochemistry revealed altered glycoconjugate distribution in developing chick embryo caudal axes.
• Glycoconjugates or their bearing cells may influence caudal axial development.

Purpose of the Study:

• To investigate the role of glycoconjugates in caudal axial development by manipulating their availability with lectins.
• To determine the effects of lectin microinjection on embryonic development, specifically focusing on caudal axis formation.

Main Methods:

• Microinjection of various lectins, including WGA and LPL, into chick embryos at different developmental stages.
• Assessment of caudal axis development for abnormalities, including neural tube and notochord defects.
• Detection of lectin binding using an anti-WGA antibody in affected developmental regions.

Main Results:

• WGA administration led to significant neural tube and notochord abnormalities, dose- and stage-dependently.
• LPL, which also binds sialic acid, produced similar defects to WGA.
• Lectins with different specificities, like succinylated WGA, caused distinct defects only at higher doses.

Conclusions:

• Glycoconjugates, particularly sialoconjugates, and the cells expressing them are likely involved in chick embryo caudal axial development.
• Lectins can be used as tools to probe the function of specific glycoconjugates during embryonic development.
• The study provides evidence for the critical role of sialic acid-containing glycoconjugates in the formation of the embryonic axis.