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Cap analysis gene expression (CAGE) of Aspergillus luchuensis mut. kawachii control and laeA disruptant strains

ABSTRACT: Cap analysis gene expression (CAGE) of Aspergillus luchuensis mut. kawachii control and laeA disruptant strains

PROVIDER: PRJNA560273 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR9969492.fastq.gz	Fastqsanger.gz
	SRR9969493.fastq.gz	Fastqsanger.gz
	SRR9969494.fastq.gz	Fastqsanger.gz
	SRR9969495.fastq.gz	Fastqsanger.gz
	SRR9969496.fastq.gz	Fastqsanger.gz

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Cap analysis gene expression (CAGE) of Aspergillus luchuensis mut. kawachii control and laeA disruptant strains

Project description:LaeA, a putative methyltransferase, is a global regulator for metabolic and development process in filamentous fungi. We characterized the laeA homologous genes in the white koji fungus, Aspergillus luchuensis mut. kawachii (A. kawachii) to examine their role in citric acid production. The ΔlaeA strain showed a significant reduction in the citric acid productivity. The cap-analysis gene expression (CAGE) revealed the laeA is required for the gene expression of a putative citrate exporter encoding cexA, which has a critical role for the citric acid production. The deficient citric acid productivity of the ΔlaeA strain was remedied by overexpression of cexA to a comparative level to that of the cexA overexpressing ΔcexA strain. In addition, chromatin immunoprecipitation coupled with quantitative PCR (ChIP-qPCR) analysis indicated that LaeA regulates gene expression of the citrate exporter encoding cexA gene via histone H3K4 and histone H3K9 methylation levels. These results indicate that LaeA is involved in the citric acid production through epigenetic regulation of cexA in A. kawachii.

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Project description:Sirtuin is considered to play a significant role in the growth phase-dependent gene expression. In this study, we characterized sirtuin in the white koji fungus, Aspergillus kawachii, to examine their role on regulation of amylolytic enzymes and citric acid productions during the solid-state culture (koji). Characterization of rice-koji made using five putative sirtuin gene disruptants indicated that they are involved in amylolytic activity and acidity of rice koji; especially the sirD disruptant showed lower levels of α-amylase activity and citric acid production per mycelial weight in the koji compared the control strain. In addition, the sirD disruptant also showed a change in mycelial pigmentation, higher sensitivity to cell wall biogenesis inhibitor such as calcofluor white and Congo red, and reduced conidia formation, indicating that SirD is required for secondary metabolism, cell wall integrity, and conidial development. The cap analysis gene expression (CAGE) indicated that the transcriptional changes related to the characteristic phenotype of the sirD disruptant (e.g., a reduced transcript level of acid-stable α-amylase gene and a citric acid exporter) in rice koji. These results indicated that SirD has a significant role on the global transcriptional regulation including productions of α-amylase and citric acid in A. kawachii during the solid-state fermentation process.

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