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Single-cell transcriptomics reveals the cellular identity of a novel progenitor population crucial for murine neural tube closure

ABSTRACT: Single-cell transcriptomics reveals the cellular identity of a novel progenitor population crucial for murine neural tube closure

PROVIDER: PRJNA1032033 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26512584.fastq.gz	Fastqsanger.gz
	SRR26512585.fastq.gz	Fastqsanger.gz
	SRR26512586.fastq.gz	Fastqsanger.gz
	SRR26512587.fastq.gz	Fastqsanger.gz
	SRR26512588.fastq.gz	Fastqsanger.gz

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Single-cell transcriptomics reveals the cellular identity of a novel progenitor population crucial for murine neural tube closure

Project description:Neural tube closure in vertebrates is achieved through a highly dynamic and coordinated series of morphogenic events involving neural plate, surface ectoderm, and neural plate border. Failure of this process in the caudal region causes spina bifida. Grainyhead-like 3 (GRHL3) is an indispensable transcription factor for neural tube closure as constitutive inactivation of which leads to fully penetrant spina bifida. Here, through single-cell transcriptomics we show that at E8.5, the time-point preceding mouse neural tube closure, the co-expression of Grhl3, Tfap2a, and Tfap2c defines a previously unrecognised progenitor population of surface ectoderm. Specific deletion of Grhl3 expression using Tfap2a-Cre recapitulate the spina bifida observed in Grhl3-null animals. Moreover, conditional inactivation of Tfap2c expression in Grhl3-expressing neural plate border cells also causes mild spina bifida. These findings clearly indicate that Grhl3-expressing neural plate border cells cohort is required for the early-stage neurulation.

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Project description:Maternal diabetes is a teratogen that can lead to neural tube closure defects in the offspring. We therefore sought to compare gene expression profiles at the site of neural tube closure between stage-matched embryos from normal dams, and embryos from diabetic dams. Neurulation-stage mouse embryos at 8.5 days of gestation were used to prepare neural tissue at the anterior aspect of neural tube closure site 1. Tissue was procured from the open neural tube immediately anterior of the closure site, and from the closed neural tube immediately posterior to the closure site by laser microdissection. For each sample, 10 sections were pooled, total RNA was extracted, and 7 ng of total RNA were used for expression profiling by Tag sequencing using an Applied Biosystems SolidSAGE kit for library construction, and an AB SOLiD 5500 XL instrument for sequencing. Sequence reads were mapped to RefSeq RNA, and count data per gene were obtained using a modified version of the Applied Biosystems SOLiDâ?¢ SAGEâ?¢ Analysis Software. diabetic dam - closed neural tube // diabetic dam - open neural tube // normal dam - closed neural tube // normal dam - open neural tube

2016-10-24 | E-GEOD-41876 | biostudies-arrayexpress

MicroRNA Regulation of Oxidative Stress, Proliferation, and Neural Tube Closure

Project description:single-cell sequencing of the mouse cranial region at E8.25 (the start of neural tube closure, at E9.5 (the end of neural tube closure, and of a miR-302 knockout embryo at E9.5 (example of neural tube closure defrect).

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Fate specification of neural plate border by canonical Wnt signaling and Grhl3 is crucial for neural tube closure.

Project description:During primary neurulation, the separation of a single-layered ectodermal sheet into the surface ectoderm (SE) and neural tube specifies SE and neural ectoderm (NE) cell fates. The mechanisms underlying fate specification in conjunction with neural tube closure are poorly understood. Here, by comparing expression profiles between SE and NE lineages, we observed that uncommitted progenitor cells, expressing stem cell markers, are present in the neural plate border/neural fold prior to neural tube closure.

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Fate specification of neural plate border by canonical Wnt signaling and Grhl3 is crucial for neural tube closure.

2015-04-17 | E-GEOD-67977 | biostudies-arrayexpress

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Project description:Neural tube closure in vertebrates is achieved through a highly dynamic and coordinated series of morphogenic events involving neuroepithelium, surface ectoderm, and neural plate border. Failure of this process in the caudal region causes spina bifida. Grainyhead-like 3 (GRHL3) is an indispensable transcription factor for neural tube closure as constitutive inactivation of the Grhl3 gene in mice leads to fully penetrant spina bifida. Here, through single-cell transcriptomics we show that at E8.5, the time-point preceding mouse neural tube closure, co-expression of Grhl3, Tfap2a, and Tfap2c defines a previously unrecognised progenitor population of surface ectoderm integral for neural tube closure. Deletion of Grhl3 expression in this cell population using a Tfap2a-Cre transgene recapitulates the spina bifida observed in Grhl3-null animals. Moreover, conditional inactivation of Tfap2c expression in Grhl3-expressing neural plate border cells also induces spina bifida. These findings indicate that a specific neural plate border cellular cohort is required for the early-stage neurulation.

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Project description:The process of neural tube closure is a highly complex morphogenetic event that results in the generation of the primordial central nervous system. During formation of the neural tube, the non-neural ectoderm separates from the neighboring neural ectoderm and forms a single layer epithelial sheet that overlies the closed neural tube. Previous work has shown that the non-neural ectoderm is necessary for proper cranial neural tube closure, however little is known about this cell population at the molecular level or how the non-neural ectoderm contributes to neural tube closure. In this study, we used a mouse genetic system to fluorescently label the non-neural ectoderm cells and FACS sorted these cells away from the other cell populations in the neural tube. We performed high throughput RNA-sequencing to identify the transcriptome of the non-neural ectoderm and compared the gene expression profile of non-neural ectoderm cells to the remaining population of cells within the neural tube in order to identify which genes are enriched within the non-neural ectoderm. This analysis provides a clue as to which underlying molecular processes may be important for non-neural ectoderm function during neural tube closure.

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