Project description:We demonstrate for the first time that the extracellular matrix glycoprotein Tenascin-C regulates the expression of key patterning genes during late embryonic spinal cord development, leading to a timely maturation of gliogenic neural precursor cells. We first show that Tenascin-C is expressed by gliogenic neural precursor cells during late embryonic development. The loss of Tenascin-C leads to a sustained generation and delayed migration of Fibroblast growth factor receptor 3 expressing immature astrocytes in vivo. Furthermore, we could demonstrate an upregulation of Nk2 transcription factor related locus 2 (Nkx2.2) and its downstream target Sulfatase 1 in vivo. A dorsal expansion of Nkx2.2-positive cells within the ventral spinal cord indicates a potential progenitor cell domain shift. Moreover, Sulfatase 1 is known to regulate growth factor signalling by cleaving sulphate residues from heparan sulphate proteoglycans. Consistent with this possibility we observed changes in both Fibroblast growth factor 2 and Epidermal growth factor responsiveness of spinal cord neural precursor cells. Taken together our data clearly show that Tenascin-C promotes the astroglial lineage progression during spinal cord development.
Project description:We demonstrate for the first time that the extracellular matrix glycoprotein Tenascin-C regulates the expression of key patterning genes during late embryonic spinal cord development, leading to a timely maturation of gliogenic neural precursor cells. We first show that Tenascin-C is expressed by gliogenic neural precursor cells during late embryonic development. The loss of Tenascin-C leads to a sustained generation and delayed migration of Fibroblast growth factor receptor 3 expressing immature astrocytes in vivo. Furthermore, we could demonstrate an upregulation of Nk2 transcription factor related locus 2 (Nkx2.2) and its downstream target Sulfatase 1 in vivo. A dorsal expansion of Nkx2.2-positive cells within the ventral spinal cord indicates a potential progenitor cell domain shift. Moreover, Sulfatase 1 is known to regulate growth factor signalling by cleaving sulphate residues from heparan sulphate proteoglycans. Consistent with this possibility we observed changes in both Fibroblast growth factor 2 and Epidermal growth factor responsiveness of spinal cord neural precursor cells. Taken together our data clearly show that Tenascin-C promotes the astroglial lineage progression during spinal cord development. in total 6 probes: 3 replica of TNC_wt and 3 replica of TNC_ko
Project description:Purpose: The purpose of this experiment is to identify expression changes after ASO-dependent depletion of mouse C9orf72 in the spinal cord of wild-type C57Bl/6 female mice. Methods: Strand specific RNA-seq was performed using RNAs extracted from spinal cord of C57Bl/6 mice two weeks after intracerebroventricular stereotactic injection of saline (n=3), a control ASO (n=3) or an ASO targeting mouse C9orf72 (n=3). C9orf72 RNA levels were reduced to approximately 30% of control levels in spinal cords from mice treated with the C9orf72 ASO. Results: Statistical comparison of RPKM values between RNAs from C9orf72 and control ASO treated animals or C9orf72 and saline treated samples revealed that only 12 genes were consistently upregulated (defined by P<0.05 adjusted for multiple testing) and 12 genes including C9orf72 were downregulated (defined by P<0.05 adjusted for multiple testing). Conclusions: Only few RNA expression changes were identified in the spinal cord following reduction of C9orf72. Use of strand specific RNA-seq to test the consequences of C9orf72 loss of function in mouse spinal cord.
Project description:Purpose: The purpose of this experiment is to identify expression changes after ASO-dependent depletion of mouse C9orf72 in the spinal cord of wild-type C57Bl/6 female mice. Methods: Strand specific RNA-seq was performed using RNAs extracted from spinal cord of C57Bl/6 mice two weeks after intracerebroventricular stereotactic injection of saline (n=3), a control ASO (n=3) or an ASO targeting mouse C9orf72 (n=3). C9orf72 RNA levels were reduced to approximately 30% of control levels in spinal cords from mice treated with the C9orf72 ASO. Results: Statistical comparison of RPKM values between RNAs from C9orf72 and control ASO treated animals or C9orf72 and saline treated samples revealed that only 12 genes were consistently upregulated (defined by P<0.05 adjusted for multiple testing) and 12 genes including C9orf72 were downregulated (defined by P<0.05 adjusted for multiple testing). Conclusions: Only few RNA expression changes were identified in the spinal cord following reduction of C9orf72.