Reconstitution of Human Prospermatogonial Development from Human-Induced Pluripotent Stem Cells.

There is a scarcity of information regarding the molecular mechanisms underlying human germ cell development due to limitations in obtaining the relevant materials. Reconstitution of human germ cell development from pluripotent stem cells in vitro would provide critical insight into the etiology of various reproductive conditions and disorders, including infertility.Recently, we reported the in vitro reconstitution of human prospermatogonial development from human-induced pluripotent stem cells through human primordial germ cell (PGC)-like cells (hPGCLCs) using long-term cultured xenogeneic reconstituted testes. Here, we describe a method to generate M-prospermatogonia-like cells (MLCs) and T1-prospermatogonia-like cells (T1LCs), which closely resemble M- and T1-prospermatogonia present in second-trimester human fetal testes in vivo.