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Eptatretus burgeri

ABSTRACT: Transcriptomics comparative analysis of the Japanese inshore hagfish, Eptatretus burgeri, the Artic lamprey, Lethenteron camtschaticum, and the cloudy catshark, Scyliorhinus torazame

PROVIDER: PRJNA371391 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	SRR5234495_1.fastq.gz	Fastqsanger.gz
	SRR5234495_2.fastq.gz	Fastqsanger.gz
	SRR5234496_1.fastq.gz	Fastqsanger.gz
	SRR5234496_2.fastq.gz	Fastqsanger.gz
	SRR5234497_1.fastq.gz	Fastqsanger.gz

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Project description:Polyploidy or whole genome duplication (WGD) is a major event that drastically reshapes genome architecture and is often assumed to be causally associated with organismal innovations and radiations. The 2R Hypothesis suggests that two WGD events (1R and 2R) occurred during early vertebrate evolution. However, the timing of the 2R event relative to the divergence of gnathostomes (jawed vertebrates) and cyclostomes (jawless hagfishes and lampreys) is unresolved and whether these WGD events underlie vertebrate phenotypic diversification remains elusive. Here we present the genome of the inshore hagfish, Eptatretus burgeri. Through comparative analysis with lamprey and gnathostome genomes, we reconstruct the early events in cyclostome genome evolution, leveraging insights into the ancestral vertebrate genome. Genome-wide synteny and phylogenetic analyses support a scenario in which 1R occurred in the vertebrate stem-lineage during the early Cambrian, and the 2R event occurred in the gnathostome stem-lineage, maximally in the late Cambrian-earliest Ordovician, after its divergence from cyclostomes. We find that the genome of stem-cyclostomes experienced at least an additional, independent genome triplication. Functional genomic and morphospace analyses demonstrate that WGD events generally contribute to developmental evolution with similar changes in the regulatory genome of both vertebrate groups. However, appreciable morphological diversification occurred only after the 2R event, questioning the general expectation that WGDs lead to leaps of bodyplan complexity.

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