Abstract
Much controversy regarding the anatomical sources of oligodendrocytes in the spinal cord and hindbrain has been resolved. However, the relative contribution of dorsal and ventral progenitors to myelination of the cortex is still a subject of debate. To assess the contribution of dorsal progenitors to cortical myelination, we ablated the basic helix-loop-helix transcription factor Olig2 in the developing dorsal telencephalon. In Olig2-ablated cortices, myelination is arrested at the progenitor stage. Under these conditions, ventrally derived oligodendrocytes migrate dorsally into the Olig2-ablated territory but cannot fully compensate for myelination deficits observed at postnatal stages. Thus, spatially restricted ablation of Olig2 function unmasks a contribution of dorsal progenitors to cortical myelination that is much greater than hitherto appreciated.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Alleles
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Animals
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Basic Helix-Loop-Helix Transcription Factors / deficiency
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Basic Helix-Loop-Helix Transcription Factors / genetics
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Basic Helix-Loop-Helix Transcription Factors / physiology
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Cell Differentiation
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Cell Lineage*
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Cell Movement
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Corpus Callosum / embryology
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Corpus Callosum / growth & development
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Corpus Callosum / ultrastructure
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Gene Expression Regulation, Developmental
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Integrases / physiology
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Mice
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Mice, Inbred C57BL
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Mice, Knockout
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Morphogenesis
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Multipotent Stem Cells / cytology*
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Myelin Sheath / physiology*
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Myelin Sheath / ultrastructure
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Nerve Tissue Proteins / deficiency
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Nerve Tissue Proteins / genetics
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Nerve Tissue Proteins / physiology
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Oligodendrocyte Transcription Factor 2
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Oligodendroglia / physiology*
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Recombination, Genetic
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Telencephalon / cytology*
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Telencephalon / embryology
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Telencephalon / growth & development
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Telencephalon / metabolism
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Viral Proteins / physiology
Substances
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Basic Helix-Loop-Helix Transcription Factors
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Nerve Tissue Proteins
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Olig2 protein, mouse
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Oligodendrocyte Transcription Factor 2
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Viral Proteins
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Cre recombinase
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Integrases