Practice question

Hydra homeostasis and budding regulated by canonical Wnt-beta-catenin pathway concentrated at oral organizer. Overexpression of stable beta-catenin via transgenesis or inhibition of GSK3beta disrupts degradation complex, increasing nuclear beta-catenin throughout body column. This lowers threshold for organizer formation leading to ectopic activation of Wnt3, formation of multiple organizing centers generating supernumerary buds along body column with ectopic tentacles and heads. Enhanced budding rate reflects increased organizer potential, mirroring beta-catenin overexpression in vertebrate axes causing secondary embryonic axes, establishing conserved role of beta-catenin in axial induction.