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ABSTRACT: The impacts of captivity on saltwater crocodile (Crocodylus porosus) microbiotas and physiology

PROVIDER: PRJNA1253344 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR33233400.fastq.gz	Fastqsanger.gz
	SRR33233401.fastq.gz	Fastqsanger.gz
	SRR33233402.fastq.gz	Fastqsanger.gz
	SRR33233403.fastq.gz	Fastqsanger.gz
	SRR33233404.fastq.gz	Fastqsanger.gz

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Identification and characterization of microRNAs (miRNAs) and their transposable element origins in the saltwater crocodile, Crocodylus porosus

Project description:MicroRNAs (miRNAs) are 18-24 nucleotide autonomous regulatory RNA molecules found in all eukaryotes. They are involved in the regulation of a multitude of genetic and biological pathways through post transcriptional gene silencing and/or translational repression. Previous data has suggested a slow evolutionary rate for the saltwater crocodile (Crocodylus porosus) over the past several million years when compared to its closest extant relatives, the birds. Understanding genome regulation, adaptive capabilities and physiological features in the saltwater crocodile in the context of relatively slow genomic change thus holds significant potential for the investigation of genomics, evolution and adaptive studies. Utilizing eleven different tissue types and sixteen small RNA libraries, we report a catalog of 644 miRNAs in the saltwater crocodile with > 78% of miRNAs being potentially novel to crocodilians. We also predicted and identified targets for the miRNAs as well as analyzed the relationship of the miRNA repertoire to transposable elements (TEs) in the saltwater crocodile that showed an increased association of DNA transposons with miRNA biogenesis when compared to retrotransposons. Phylogenetic analysis of C. porosus miRNA expectedly revealed highest number of miRNAs in sister crocodilian clades of the American Alligator and the Indian Gharial. This work reports the first comprehensive analysis of miRNAs in Crocodylus porosus for and addresses the potential impacts of miRNAs in regulating the genome in the saltwater crocodile as well as supporting the role of TEs as a source for miRNAs, adding to the increasing evidence that TEs play a significant role in the evolution of gene regulation.

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