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PromethION sequencing of Micropoecilia picta

ABSTRACT: PromethION sequencing and assembly of the genome of Micropoecilia picta, a fish with a highly degenerated Y chromosome

PROVIDER: PRJEB43222 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	ERR5333863.fastq.gz	Fastqsanger.gz

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PromethION Sequencing and Assembly of the Genome of Micropoecilia picta, a Fish with a Highly Degenerated Y Chromosome.

Project description:We here describe sequencing and assembly of both the autosomes and the sex chromosome in Micropoecilia picta, the closest related species to the guppy, Poecilia reticulata. Poecilia (Micropoecilia) picta is a close outgroup for studying the guppy, an important organism for studies in evolutionary ecology and in sex chromosome evolution. The guppy XY pair (LG12) has long been studied as a test case for the importance of sexually antagonistic variants in selection for suppressed recombination between Y and X chromosomes. The guppy Y chromosome is not degenerated, but appears to carry functional copies of all genes that are present on its X counterpart. The X chromosomes of M. picta (and its relative Micropoecilia parae) are homologous to the guppy XY pair, but their Y chromosomes are highly degenerated, and no genes can be identified in the fully Y-linked region. A complete genome sequence of a M. picta male may therefore contribute to understanding how the guppy Y evolved. These fish species' genomes are estimated to be about 750 Mb, with high densities of repetitive sequences, suggesting that long-read sequencing is needed. We evaluated several assembly approaches, and used our results to investigate the extent of Y chromosome degeneration in this species.

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