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Petromyzon marinus, Gallus gallus, Danio rerio, Leucoraja erinacea

ABSTRACT: Evolution of the vertebrate New Head by progressive acquisition of neural crest regulatory subcircuits

PROVIDER: PRJNA497902 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR9958770.fastq.gz	Fastqsanger.gz
	SRR9958780.fastq.gz	Fastqsanger.gz
	SRR9958771.fastq.gz	Fastqsanger.gz
	SRR9958772.fastq.gz	Fastqsanger.gz
	SRR9958773.fastq.gz	Fastqsanger.gz

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scRNA-seq of sea lamprey (Petromyzon marinus) brain regions

Project description:scRNA-seq was used in order to produce a cell type atlas of the larval and adult sea lamprey (Petromyzon marinus) brain. This resource enabled us to reveal the cell type composition and molecular organization of a representative of a lineage (i.e., the cyclostomes) that diverged from the rest of vertebrates around 500 million years ago, and lays the foundations for a better comprehension of vertebrate brain evolution

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Measurement of suction pressure dynamics of sea lampreys, Petromyzon marinus.

Project description:Species-specific monitoring activities represent fundamental tools for natural resource management and conservation but require techniques that target species-specific traits or markers. Sea lamprey, a destructive invasive species in the Laurentian Great Lakes and conservation target in North America and Europe, is among very few fishes that possess and use oral suction, yet suction has not been exploited for sea lamprey control or conservation. Knowledge of specific characteristics of sea lamprey suction (e.g., amplitude, duration, and pattern of suction events; hereafter 'suction dynamics') may be useful to develop devices that detect, record, and respond to the presence of sea lamprey at a given place and time. Previous observations were limited to adult sea lampreys in static water. In this study, pressure sensing panels were constructed and used to measure oral suction pressures and describe suction dynamics of juvenile and adult sea lampreys at multiple locations within the mouth and in static and flowing water. Suction dynamics were largely consistent with previous descriptions, but more variation was observed. For adult sea lampreys, suction pressures ranged from -0.6 kPa to -26 kPa with 20 s to 200 s between pumps at rest, and increased to -8 kPa to -70 kPa when lampreys were manually disengaged. An array of sensors indicated that suction pressure distribution was largely uniform across the mouths of both juvenile and adult lampreys; but some apparent variation was attributed to obstruction of sensing portal holes by teeth. Suction pressure did not differ between static and flowing water when water velocity was lower than 0.45 m/s. Such information may inform design of new systems to monitor behavior, distribution and abundance of lampreys.

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Expression of GRCs during male and female meiosis in sea lamprey (Petromyzon marinus)

Project description:Many vertebrate species undergo programmed elimination of specific chromosomes during embryogenesis, only retaining these chromosomes in their germ cells. These chromosomes are referred to as germline-restricted chromosomes (GRCs), many of which have been found to harbor genes that are only expressed in the germline. In some species elimination of GRCs occurs in a sex specific manner, with GRCs being transmitted or eliminated by only one sex. While GRCs have been extensively characterized in male sea lampreys (Petromyzon marinus), the status of GRCs in females has not yet been resolved, though it has been hypothesized that these chromosomes might provide a solution to resolving the long-standing mystery of lamprey sex determining mechanisms. To gain insight into the roles of GRCs in female lampreys, we performed several karyological, transcriptional and genomic analyses, which demonstrate that GRCs are present in female lamprey germline, transmitted by oocytes and somatically eliminated in both sexes. These analyses also show that GRCs play important roles in the maintenance and development of female germline but provide no evidence for sex-specific variation in the elimination and transmission of lamprey GRCs. These findings underscore the fact that programmed DNA loss has evolved in parallel several times over the course of eukaryotic evolution, and that sex-specific transmission/retention of GRCs likely follows no universal rules.

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