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Tokudaia osimensis

ABSTRACT: Tokudaia osimensis overview

PROVIDER: PRJNA895513 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	DRR066821_1.fastq.gz	Fastqsanger.gz
	DRR066821_2.fastq.gz	Fastqsanger.gz
	DRR066822_1.fastq.gz	Fastqsanger.gz
	DRR066822_2.fastq.gz	Fastqsanger.gz

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Project description:Herein, we present the first high-quality long-read-based chromosome-level genome assemblies and gene annotations of the genomes of three endangered Tokudaia species: Tokudaia osimensis, Tokudaia tokunoshimensis, and Tokudaia muenninki. These species, which are endemic to different islands of the Ryukyu Islands, Japan, exhibited unique karyotypes and sex chromosomal characteristics. The genome assemblies generated using PacBio, Illumina, and Hi-C sequence data consisted of 13 (corresponded to 12 autosomes and one X chromosome), 23 (corresponded to 22 autosomes and one X chromosome), and 23 (corresponded to 21 autosomes and the neo- and ancestral X regions) chromosome-level scaffolds that contained 2,445, 2,477, and 2,661 Mbp of sequence data, respectively. Annotations of protein-coding genes were performed using RNA-Seq-based, homology-based, and Ab initio methods. BUSCO completeness values for every species exceeded 96% for genomes and 98% for genes. These data can be an important resource for contributing to our understanding of species genomes resulting from allopatric speciation and provide insights into mammalian sex-determination mechanisms and sex chromosome evolution.

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Tokudaia muenninki

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Tokudaia tokunoshimensis

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Molecular mechanism of male differentiation is conserved in the SRY-absent mammal, Tokudaia osimensis.

Project description:The sex-determining gene SRY induces SOX9 expression in the testes of eutherian mammals via two pathways. SRY binds to testis-specific enhancer of Sox9 (TESCO) with SF1 to activate SOX9 transcription. SRY also up-regulates ER71 expression, and ER71 activates Sox9 transcription. After the initiation of testis differentiation, SOX9 enhances Amh expression by binding to its promoter with SF1. SOX8, SOX9 and SOX10, members of the SOXE gene family, also enhance the activities of the Amh promoter and TESCO. In this study, we investigated the regulation of these sexual differentiation genes in Tokudaia osimensis, which lacks a Y chromosome and the SRY gene. The activity of the AMH promoter was stimulated by SOXE genes and SF1. Mutant AMH promoters, with mutations in its SOX and SF1 binding sites, did not show significant activity by SOX9 and SF1. These results indicate that AMH expression was regulated by the binding of SOX9 and SF1. By contrast, SOXE genes could not enhance TESCO activity. These results indicate that TESCO enhancer activity was lost in this species. Furthermore, the activity of the SOX9 promoter was enhanced by ER71, indicating that ER71 may play an important role in the testis-specific expression of SOX9.

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