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ABSTRACT: Multiple independent origins of apicomplexan-like parasites

PROVIDER: PRJNA539986 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8980200_1.fastq.gz	Fastqsanger.gz
	SRR8980200_2.fastq.gz	Fastqsanger.gz
	SRR8980210_1.fastq.gz	Fastqsanger.gz
	SRR8980210_2.fastq.gz	Fastqsanger.gz
	SRR8980201_1.fastq.gz	Fastqsanger.gz

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Project description:ApiAP2 are a family of conserved transcription factors (TF) that play an important role in regulating gene expression in apicomplexan parasites. ApiAP2 proteins that may control the cell cycle dependent expression program are to be discovered. To better understand how these cell-cycle dependent gene expression profiles are established, we identified ApiAP2 proteins showing a cell cycle dependent expression. Using the Auxin-degradation system, we produced several inducible knock-down (iKD) mutant for these ApiAP2 proteins. Among them, a cell-cycle regulated ApiAP2 is expressed during the late S-phase of the tachyzoite cell-cycle. The iKD mutant parasites for this gene are unable to proliferate. In presence of Auxin, the mutant parasites do not produce daughter cells and are arrested in the early phase of budding. This indicates that this TF may specifically regulate the early steps of the daughter cell formation. Using RNA-Seq, we demonstrate that the level of expression of number of transcripts is affected by the knock-down of this potential TF.

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Project description:Toxoplasma gondii is an apicomplexan parasite infecting human and animals, causing huge health concerns and economic losses. Calcium ion, a critical second messenger in cells, can regulate related vital activities, particularly in parasite invasion and escape processes. Calmodulin (CaM) is a short, highly conserved Ca2+ binding protein found in all eukaryotic cells, including apicomplexan parasites. After binding to Ca2+, CaM can be activated to interact with a variety of proteins (such as enzymes). Since direct destruction of CaM is impossible, few studies have been conducted on the function of CaM in T. gondii. We generated the CaM indirect knockout strain (iCaM) using a tetracycline-off system with CaM promoter sequence in T. gondii TATI strain, and compared the transcriptomes of tachyzoites with and without Calmodulin.

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