title: Sloppy paired 1/2 regulate glial cell fates by inhibiting Gcm function.
abstract: Organization of the central nervous system during embryonic development is an intricate process involving a host of molecular players. The Drosophila segmentation genes, sloppy paired (slp) 1/2 have been shown to be necessary for development of a neuronal precursor cell subtype, the NB4-2 cells. Here, we show that slp1/2 also have roles in regulating glial cell fates. Using slp1/2 loss-of-function mutants, we show an increase in glial cell markers, glial cells missing (gcm) and reversed polarity. In contrast, misexpression of either slp1 or slp2 causes downregulation of glial cell-specific genes and alters the fate of glial and neuronal cells. Furthermore, we demonstrate that Slp1 and its mammalian ortholog, Foxg1, inhibit Gcm transcriptional activity as well as bind Gcm. Taken together, these data show that Slp1/Foxg1 regulate glial cell fates by inhibiting Gcm function.
authors.affiliation: The Arthur and Sonia Labatt Brain Tumour Research Center, Hospital for Sick Children, Toronto, Ontario, Canada.
authors.forename: Soma
authors.initials: S
authors.lastname: Mondal
authors.forename: Stacey M
authors.initials: SM
authors.lastname: Ivanchuk
authors.forename: James T
authors.initials: JT
authors.lastname: Rutka
authors.forename: Gabrielle L
authors.initials: GL
authors.lastname: Boulianne
mesh_terms: D000818:Animals; D019556:COS Cells; D002454:Cell Differentiation / Q000235:genetics; D019070:Cell Lineage / Q000235:genetics; D002490:Central Nervous System / Q000166:cytology / Q000196:embryology* / Q000378:metabolism; D002522:Chlorocebus aethiops; D004268:DNA-Binding Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D015536:Down-Regulation / Q000235:genetics; D029721:Drosophila Proteins / Q000235:genetics* / Q000378:metabolism; D004331:Drosophila melanogaster / Q000196:embryology* / Q000235:genetics / Q000378:metabolism; D047108:Embryonic Development / Q000235:genetics; D051858:Forkhead Transcription Factors / Q000235:genetics / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental / Q000235:genetics; D009154:Mutation / Q000235:genetics; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism; D009457:Neuroglia / Q000166:cytology / Q000378:metabolism*; D009474:Neurons / Q000166:cytology / Q000378:metabolism; D011485:Protein Binding / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism*; D014157:Transcription Factors / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D051858:Forkhead Transcription Factors; C489565:Foxg1 protein, mouse; C102805:GCM protein, Drosophila; D009419:Nerve Tissue Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; C074838:slp1 protein, Drosophila