The present invention provides a transgenic invertebrate model for Alzheimer's disease and a method for screening a therapeutic agent for Alzheimer's disease using the model. The present invention provides a transgenic invertebrate, in which genes encoding enzymes involved in production of a ganglioside are introduced and the ganglioside is expressed.

Mammalian milk oligosaccharides (MMO) are produced in plants engineered to express recombinant MMO biosynthetic pathways.