title: Regeneration of male germline stem cells by spermatogonial dedifferentiation in vivo.
abstract: Although the ability of engrafted stem cells to regenerate tissue has received much attention, the molecular mechanisms controlling regeneration are poorly understood. In the Drosophila male germline, local activation of the Janus kinase-signal transducer and activator of transcription (Jak-STAT) pathway maintains stem cells; germline stem cells lacking Jak-STAT signaling differentiate into spermatogonia without self-renewal. By conditionally manipulating Jak-STAT signaling, we find that spermatogonia that have initiated differentiation and are undergoing limited mitotic (transit-amplifying) divisions can repopulate the niche and revert to stem cell identity. Thus, in the appropriate microenvironment, transit-amplifying cells dedifferentiate, becoming functional stem cells during tissue regeneration.
authors.affiliation: Department of Cell Biology, 725 North Wolfe Street, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
authors.forename: Crista
authors.initials: C
authors.lastname: Brawley
authors.forename: Erika
authors.initials: E
authors.lastname: Matunis
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002455:Cell Division; D004268:DNA-Binding Proteins / Q000378:metabolism; D004330:Drosophila / Q000502:physiology*; D029721:Drosophila Proteins; D005854:Germ Cells / Q000166:cytology / Q000502:physiology*; D008297:Male; D008938:Mitosis; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D012038:Regeneration; D050791:STAT Transcription Factors; D015398:Signal Transduction; D013090:Spermatocytes / Q000502:physiology; D013093:Spermatogonia / Q000166:cytology* / Q000502:physiology*; D013234:Stem Cells / Q000166:cytology / Q000502:physiology*; D013737:Testis / Q000166:cytology; D015534:Trans-Activators / Q000378:metabolism
chemical_list: D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D050791:STAT Transcription Factors; C105675:Stat92E protein, Drosophila; D015534:Trans-Activators; D011505:Protein-Tyrosine Kinases