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A draft genome of the flour moth, Ephestia kuehniella

ABSTRACT: Sequencing read data for Ephestia kuehniella draft genome

PROVIDER: PRJEB49052 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
		Other
	CAKLCC01.dat.gz	Other
	CAKLCC01.fasta.gz	Fasta.gz
	CAKLCC01.master.dat	Other
	CAKLCD01.dat.gz	Other

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Project description:We present genomes and pupal transcriptomes of the Mediterranean flour moth, Ephestia kuehniella. The moth is a world-wide storage pest as well as a laboratory species with a considerable background in developmental biology, genetics, and cytogenetics. The sequence data were derived from a highly inbred laboratory strain and, hence, display very little heterozygosity. Female and male genomes and transcriptomes are represented separately in two sets each of raw and assembled sequence data. They are designed as a basis to develop new strategies in pest control, to elucidate the molecular adaptation for its peculiar lifestyle, and for research on sex chromosome structure, sex determination and sex-specific gene activity. For a test, all genes known or suspected to have a role in sex determination were extracted from the data. Raw sequencing data and assemblies are available at European Nucleotide Archive under accession number PRJEB49052.

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A conserved role of the duplicated Masculinizer gene in sex determination of the Mediterranean flour moth, Ephestia kuehniella.

Project description:Sex determination in the silkworm, Bombyx mori, is based on Feminizer (Fem), a W-linked Fem piRNA that triggers female development in WZ individuals, and the Z-linked Masculinizer (Masc), which initiates male development and dosage compensation in ZZ individuals. While Fem piRNA is missing in a close relative of B. mori, Masc determines sex in several representatives of distant lepidopteran lineages. We studied the molecular mechanisms of sex determination in the Mediterranean flour moth, Ephestia kuehniella (Pyralidae). We identified an E. kuehniella Masc ortholog, EkMasc, and its paralog resulting from a recent duplication, EkMascB. Both genes are located on the Z chromosome and encode a similar Masc protein that contains two conserved domains but has lost the conserved double zinc finger domain. We developed PCR-based genetic sexing and demonstrated a peak in the expression of EkMasc and EkMascB genes only in early male embryos. Simultaneous knock-down experiments of both EkMasc and EkMascB using RNAi during early embryogenesis led to a shift from male- to female-specific splicing of the E. kuehniella doublesex gene (Ekdsx), their downstream effector, in ZZ embryos and resulted in a strong female-biased sex-ratio. Our results thus confirmed the conserved role of EkMasc and/or EkMascB in masculinization. We suggest that the C-terminal proline-rich domain, we have identified in all functionally confirmed Masc proteins, in conjunction with the masculinizing domain, is important for transcriptional regulation of sex determination in Lepidoptera. The function of the Masc double zinc finger domain is still unknown, but appears to have been lost in E. kuehniella.

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