eLife Assessment
This manuscript provides evidence that mouse germline cysts develop an asymmetric Golgi, ER, and microtubule-associated structure, referred to as Visham, which in many ways resembles the fusome of Drosophila germline cysts. This is an important study that provides new evidence that fusome-like structures exist in germ cell cysts across species. While most of the data are solid, several instances remain in which conclusions regarding the dynamics and function of Visham should be restated, or additional experimental evidence should be provided to more fully support the authors' interpretations.