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ABSTRACT: Behavioral Genomics of Porites astreoides larval preference for settlement cues

PROVIDER: PRJNA531192 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8860830.fastq.gz	Fastqsanger.gz
	SRR8860840.fastq.gz	Fastqsanger.gz
	SRR8860850.fastq.gz	Fastqsanger.gz
	SRR8860860.fastq.gz	Fastqsanger.gz
	SRR8860831.fastq.gz	Fastqsanger.gz

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Interdependent photo- and chemosensory systems regulate larval settlement in a marine sponge

Project description:Marine pelagic larvae from throughout the animal kingdom use a hierarchy of environmental cues to identify a suitable benthic habitat on which to settle and metamorphose into the reproductive phase of the life cycle. The majority of larvae are induced to settle by biochemical cues and many species have long been known to preferentially settle in the dark. Combined, these data suggest that larval responses to light and biochemical cues may be linked, but this is yet to be explored at the molecular level. Here, we track vertical position of larvae of the sponge Amphimedon queenslandica to show that they descend to the benthos at twilight, by which time they are competent to respond to biochemical cues, consistent with them naturally settling in the dark. We then conduct larval settlement assays under three different light regimes (natural day-night, constant dark or constant light), and use transcriptomics on individual larvae to identify candidate molecular pathways underlying the different settlement responses that we observe. We find that constant light prevents larval settlement in response to biochemical cues, likely via actively repressing chemostransduction; this is consistent with the sustained upregulation of a photosensory cryptochrome and two putative inactivators of G-protein signalling in the constant light only. We hypothesise that photo- and chemosensory systems may be hierarchically integrated into ontogeny to regulate larval settlement via nitric oxide (NO) and cyclic guanosine monophosphate (cGMP) signalling in this sponge that belongs to one of the earliest branching of the extant animal lineages.

2019-10-09 | GSE130274 | GEO

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Exposure to the Florida red tide dinoflagellate, Karenia brevis, and its associated brevetoxins induces ecophysiological and proteomic alterations in Porites astreoides

Project description:As reef-building corals are increasingly being exposed to persistent threats that operate on both regional and global scales there is a pressing need to better understand the complex processes that diminish coral populations. This study investigated the impacts of the Florida Red Tide dinoflagellate Karenia brevis and associated brevetoxins on selected facets of coral biology using Porites astreoides as a model system. When provided with choice assays, P. astreoides larvae were shown to actively avoid seawater containing red tide or purified brevetoxins. However, forced exposure to similar treatments induced time-dependent physiological and behavioral changes that were captured by PAM fluorometry and settlement and survival assays, respectively. Adult fragments of P. astreoides exposed to red tide or associated brevetoxins displayed signs of proteomic alterations that were characterized by use of an iTRAQ-based quantitative proteomic analysis. The novel use of this technique on P. astreoides demonstrated that protein expression was highly contingent upon biological versus chemical treatment and that several broad pathways associated with cell stress were affected including redox homeostasis, protein folding, energy metabolism, and reactive oxygen species (ROS) production. The results herein provide new insight into the ecology, behavior and sublethal stress of reef-building corals in response to K. brevis exposure and underscore the importance of recognizing the potential of red tide to act as a regional stressor to these important foundation species.

2019-10-08 | MSV000084432 | MassIVE

Transcriptomes of individual Amphimedon queenslandica larvae and settled post-larvae that were presented with one of three different settlement cues at different times (hours) post emergence from the adult sponge

Project description:To assess how larvae of different ages vary in their responses to different settlement cues, we induced individual Amphimedon queenslandica larvae with one of three different settlement cues at 1.5, 3, 5, and 8 hours post emergence (hpe) from the adult sponge. The settlement cues were (1) the articulated coralline algae Amphiroa fragilissima, (2) the crustose coralline algae Mesophyllum sp., and (3) the filtered seawater (FSW) negative control. We used CEL-Seq2, an RNA-Sequencing approach (Hashimshony et al., 2016), to generate transcriptome data for a total of 144 individuals (larvae and settled post-larvae) at 2 hours post induction (hpi) to the different settlement cues.

2024-06-11 | GSE134077 | GEO

Project description:Gene expression response of Porites astreoides larval families to sublethal heat stress

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Project description:Porites Astreoides Raw sequence reads

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