Combinatorial profiles of oligodendrocyte-selective classes of transcriptional regulators differentially modulate myelin basic protein gene expression.
Recent studies suggest that specific neural basic helix-loop-helix (HLH; i.e., Olig1 and Olig2, Mash1), associated inhibitory HLH (i.e., Id2 and Id4), high-mobility group domain (i.e., Sox10), and homeodomain (i.e., Nkx2.2) transcription factors are involved in oligodendrocyte (OL) lineage specification and progressive stages of maturation including myelination. However, the developmental interplay among these lineage-selective determinants, in a cell- and maturational stage-specific context, has not yet been defined. We show here in vivo and in vitro developmental expression profiles for these distinct classes of transcriptional regulators of OLs. We show that progressive stages of OL lineage maturation are characterized by dynamic changes in the subcellular distribution of these transcription factors and by different permutations of combinatorial transcriptional codes. Transient transfections of these precise combinatorial codes with a luciferase reporter gene driven by the myelin basic protein promoter define how changes in the molecular composition of these transcriptional complexes modulate myelin gene expression. Our overall findings suggest that the dynamic interplay between developmental stage-specific classes of transcriptional activators and associated inhibitory factors orchestrate myelin gene expression during terminal maturation of the mammalian CNS.
Gokhan
Solen
S
Institute for Brain Disorders and Neural Regeneration, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
Marin-Husstege
Mireya
M
Yung
Shau Yu
SY
Fontanez
Darah
D
Casaccia-Bonnefil
Patrizia
P
Mehler
Mark F
MF
D016475:3T3 Cells; D000818:Animals; D000831:Animals, Newborn; D003470:Culture Media; D005786:Gene Expression Regulation / Q000187:drug effects; D017930:Genes, Reporter; D000090322:Homeobox Protein Nkx-2.2; D008156:Luciferases / Q000235:genetics; D051379:Mice; D004676:Myelin Basic Protein / Q000235:genetics*; D009457:Neuroglia / Q000502:physiology; D009474:Neurons / Q000502:physiology; D009836:Oligodendroglia / Q000187:drug effects / Q000502:physiology*; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology; D016548:Prosencephalon / Q000502:physiology*; D015534:Trans-Activators / Q000378:metabolism*; D014158:Transcription, Genetic
D003470:Culture Media; D000090322:Homeobox Protein Nkx-2.2; D004676:Myelin Basic Protein; C000715627:Nkx2-2 protein, mouse; D010982:Platelet-Derived Growth Factor; D015534:Trans-Activators; D008156:Luciferases