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Endogenous RAC1 P29S in mouse melanocytes

ABSTRACT: Endogenous RAC1 P29S in mouse melanocytes

PROVIDER: PRJNA485293 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7663740_1.fastq.gz	Fastqsanger.gz
	SRR7663740_2.fastq.gz	Fastqsanger.gz
	SRR7663741_1.fastq.gz	Fastqsanger.gz
	SRR7663741_2.fastq.gz	Fastqsanger.gz
	SRR7663742_1.fastq.gz	Fastqsanger.gz

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Endogenous RAC1 P29S in mouse melanocytes

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Effect of Rac1 haploinsufficiency on the gene expression profile of mouse endothelial cells

Project description:The therapeutic potential of neurotrophic factors has been hampered by their inability to achieve adequate tissue penetration. Brain blood vessels, however, could be an alternative target for neuro-salvage therapies by virtue of their close proximity to neurons. Here we show that hemizygous deletion of Rac1 in mouse endothelial cells (ECs) attenuates brain injury and edema following focal cerebral ischemia. To explore the mechanisms whereby decrease of Rac1 in ECs provide neuroprotection, ECs were derived from Rac1+/+ and Rac1+/- mice. Microarray analysis was performed to determine the differential gene expression between Rac1+/+ and Rac1+/- ECs. Rac1+/+ and Rac1+/- ECs were cultured to subconfluence. Total RNA was extracted and reverse transcribed. Rac1+/+ (n = 2) and Rac1+/- (n = 2) EC cDNAs were labeled with Cy3 and Cy5, respectively, and equimolar mixtures of labeled Rac1+/+ and Rac1+/- probes were hybridized to 2 slides (sample #21648, #21649). Additionally, Rac1+/+ (n = 2) and Rac1+/- (n=2) EC cDNAs labeled with Cy5 and Cy3 (dye-swapping) were hybridized to 2 slides (sample #21650, #21651). Comparison of signal intensities between Rac1+/+ (channel 2) and Rac1+/- (channel 1) was conducted on each slide (sample), and the ratio of intensities from 4 slides were statistically assessed for each gene feature to investigate differential gene expression.

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Project description:The microarray was conducted from RNA isolated from mouse mammary glands harvested from Involution day 2 mice. Cre-mediated specific Rac1 gene deletion in luminal mammary epithelial cells was achieved by crossing Rac1fx/fxRosaYFP mice with WAPiCreTg/â¢ mice to produce Rac1fx/fxYFP ;WAPiCreTg/â¢ (Rac1-/-) mice. Rac1fx/fxYFP mice that lacked the Cre gene were used as wild type (WT) controls. The RNA was isolated from the inguinal gland 4 for each mouse

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Effect of Rac1 haploinsufficiency on the gene expression profile of mouse endothelial cells

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Project description:Damage to the gene regulatory network governing terminal differentiation of melanocytes leads to pigmentation phenotypes and increases the risk for melanoma. Microphthalmia-associated transcription factor (MITF) directly activates expression of melanocyte differentiation effectors, and levels of MITF have been proposed to govern the melanoma phenotype. Mutations in the gene encoding Transcription Factor Activator Protein 2 alpha (TFAP2A) cause reduced pigmentation in model organisms and premature hair graying in humans, and TFAP2A expression tends to be lower in advanced melanoma tumors than in benign nevi. However, the transcriptional targets of TFAP2A in melanocytes, and the epistatic relationship of TFAP2A and MITF, have been unclear. Using microarray-based analysis of zebrafish tfap2a mutant embryos, we generated a profile of genes whose expression is Tfap2a-dependent. We conducted anti-TFAP2A chromatin immunoprecipitation followed by next-generation sequencing (ChIP-seq) in immortalized mouse melanocytes and human primary melanocytes, and discovered that TFAP2A peaks are present near the promoters of Tfap2a-dependent genes expressed in melanocytes, and also at the majority of enhancers active in melanocytes. Comparison of TFAP2A ChIP-seq data to published MITF ChIP-seq data showed that the set of genes with promoters bound by both MITF and TFAP2A is enriched for the gene ontology term “pigment cell differentiation.” Deletion analysis of one such co-bound promoter, for Transient Receptor Potential Melastatin-like 1(TRPM1), confirmed that its expression depends on the presence of MITF binding sites as previously shown, but also depends on the presence of TFAP2A binding sites. Finally, we find that mitfa and tfap2a interact genetically in zebrafish. Collectively, these results show that TFAP2A, operating in parallel with MITF, directly regulates effectors of terminal differentiation in melanocytes and melanoma.

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