Requirement for LIM Homeobox Gene Isl1 in Motor Neuron Generation Reveals a Motor Neuron– Dependent Step in Interneuron Differentiation
Copyright policy )Requirement for LIM Homeobox Gene Isl1 in Motor Neuron Generation Reveals a Motor Neuron– Dependent Step in Interneuron Differentiation
Motor neuron differentiation is accompanied by the expression of a LIM homeodomain transcription factor, Islet1 (ISL1). To assess the involvement of ISL1 in the generation of motor neurons, we analyzed cell differentiation in the neural tube of embryos in which ISL1 expression has been eliminated by gene targeting. Motor neurons are not generated without ISL1, although many other aspects of cell differentiation in the neural tube occur normally. A population of interneurons that express Engrailed1 (EN1), however, also fails to differentiate in Isl1 mutant embryos. The differentiation of EN1+ interneurons can be induced in both wild-type and mutant neural tissue by regions of the neural tube that contain motor neurons. These results show that ISL1 is required for the generation of motor neurons and suggest that motor neuron generation is required for the subsequent differentiation of certain interneurons.
- Roche (United States) United States
- Roche Institute of Molecular Biology United States
- King’s University United States
- Umeå University Sweden
- Howard Hughes Medical Institute United States
Central Nervous System, Homeodomain Proteins, Motor Neurons, Biochemistry, Genetics and Molecular Biology(all), Chimera, Homozygote, LIM-Homeodomain Proteins, Genes, Homeobox, Gene Expression Regulation, Developmental, Cell Differentiation, Chick Embryo, DNA-Binding Proteins, Mice, Inbred C57BL, Mice, Interneurons, Culture Techniques, Gene Targeting, Animals, Biomarkers, Cell Division, Cells, Cultured
Central Nervous System, Homeodomain Proteins, Motor Neurons, Biochemistry, Genetics and Molecular Biology(all), Chimera, Homozygote, LIM-Homeodomain Proteins, Genes, Homeobox, Gene Expression Regulation, Developmental, Cell Differentiation, Chick Embryo, DNA-Binding Proteins, Mice, Inbred C57BL, Mice, Interneurons, Culture Techniques, Gene Targeting, Animals, Biomarkers, Cell Division, Cells, Cultured
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