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Lutjanus erythropterus

ABSTRACT: Transcriptome or Gene expression of snappers

PROVIDER: PRJNA215019 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR974156_1.fastq.gz	Fastqsanger.gz
	SRR974156_2.fastq.gz	Fastqsanger.gz

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Project description:In this study, morphology observation and illumina sequencing were performed on two different coloration skins of crimson snapper (Lutjanus erythropterus), the black zone and the red zone. Three types of chromatophores, melanophores, iridophores and xanthophores, were organized in the skins. The main differences between the two colorations were in the amount and distribution of the three chromatophores. After comparing the two transcriptomes, 9200 unigenes with significantly different expressions (ratio change ≥ 2 and q-value ≤ 0.05) were found, of which 5972 were up-regulated in black skin and 3228 were up-regulated in red skin. Through the function annotation, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis of the differentially transcribed genes, we excavated a number of uncharacterized candidate pigment genes as well as found the conserved genes affecting pigmentation in crimson snapper. The patterns of expression of 14 pigment genes were confirmed by the Quantitative real-time PCR analysis between the two color skins. Overall, this study shows a global survey of the morphological characters and transcriptome analysis of the different coloration skins in crimson snapper, and provides valuable cellular and genetic information to uncover the mechanism of the formation of pigment patterns in snappers.

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First Molecular Identification of Caligus clemensi on Cultured Crimson Snapper Lutjanus erythropterus on Jerejak Island, Penang, Peninsular Malaysia.

Project description:Fish parasites such as Caligus clemensi are a serious concern for cultured fish in many regions of the world, including Malaysia. This study was designed to elucidate the parasites' prevalence and intensity coupled with the morphology and molecular identification of C. clemensi on cultured Lutjanus erythropterus in Jerejak Island, Penang, Peninsular Malaysia. The study was carried out on 200 fish specimens of cultured L. erythropterus obtained from the GST group aquaculture farm. Parasites were collected from the infested part of L. erythropterus fish, and their prevalence and intensity were determined. The parasites were identified morphologically using a field emission scanning electron microscope. Molecular studies were performed through PCR amplification and sequencing. MEGA 5 was used to construct a phylogenetic tree using the pairwise distance method. The results showed that only the C. clemensi parasite was found prevalent on L. erythropterus fish with a prevalence and mean intensity (S.D) of 198 (99%) and 36.4 ± 12.2, respectively. The prevalence varied significantly with respect to fish length (p < 0.05). The nucleotide BLAST sequence for 18S ribosomal RNA partial sequences showed 97% with 100% query similarity, E-value 0 with C. clemensi with the accession number DQ123833.1. Conclusively, C. clemensi remains a major parasite of L. erythropterus in the study area.

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