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PTBP2 knock-down RNA-seq from human iPSC-neurons

ABSTRACT: PTBP2 knock-down RNA-seq from human iPSC-neurons

PROVIDER: PRJNA851735 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR19782076_1.fastq.gz	Fastqsanger.gz
	SRR19782076_2.fastq.gz	Fastqsanger.gz
	SRR19782077_1.fastq.gz	Fastqsanger.gz
	SRR19782077_2.fastq.gz	Fastqsanger.gz
	SRR19782078_1.fastq.gz	Fastqsanger.gz

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PTBP2 knock-down RNA-seq from human iPSC-neurons

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Project description:To identify PTBP2 targets important for neural fate acqusition, miR-9/9*-124-mediated direct conversion of human fibroblasts into neurons was employed. We showed that PTBP2 is important for the successful acquisition of neuronal fate and profiled fibroblasts and reprogrammed neurons with and without PTBP2 knockdown to identify neuronal-associated PTBP2 targets during reprogramming.

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Project description:The splicing regulator PTBP2 controls a program of embryonic splicing required for neuronal maturation. The splicing regulatory proteins PTBP1 and PTBP2 show distinct temporal expression profiles in the developing brain. Neuronal progenitor cells predominantly express PTBP1, whereas developing neurons express high levels of PTBP2, which are subsequently reduced late in neuronal maturation. We show here that PTBP2 and the program of splicing it controls are essential to proper neuronal maturation and survival. To investigate its in vivo function, we generated conditional PTBP2 null alleles in mice. Loss of PTBP2 in neuronal progenitor cells leads to neonatal death without gross defects in brain architecture. Mice with specific depletion of PTBP2 in the cortex and forebrain are viable. However over the first three postnatal weeks, when the normal cortex expands and develops mature circuits, the PTBP2 null cortices degenerate. We find that PTBP2-/- neurons cultured from embryonic brain show the same initial viability as wild type cells with proper early marker expression and neurite outgrowth. Strikingly, between 10 and 20 days in culture PTBP2 null neurons undergo a catastrophic failure to mature and die. To assess the target transcripts leading to these phenotypes, we examined the genomewide splicing changes in the PTBP2 null brains. This identified a large number of mis-regulated exons that share a temporal pattern of regulation; in the absence of PTBP2 many isoforms normally found in adults are precociously expressed in the developing brain. Transcripts following this pattern encode essential neuronal proteins affecting neurite growth, pre- and post-synaptic assembly, and synaptic transmission. Our results define a new genetic regulatory program essential for neuronal survival and maturation, where PTBP2 acts to temporarily repress expression of protein isoforms until the final maturation of the neuron.

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