Chelidonichthys spinosus, commonly known as the spiny red gurnard of the order Scorpaeniformes, is a typical migratory fish that makes the offshore overwintering migration in late autumn and early winter, and returns to nearshore areas for to breed in the spring.
It has a snow-white belly, reddish-brown body, and under its gills, it has a pair of colorful, glowing green fluorescent “butterfly wings.” Under these wings, there are three pairs of appendages that resemble the feet of ballet dancers. In fact, it is six separate pectoral fins that are very flexible and have taste buds that help in searching.
To investigate the evolutionary mechanisms behind the unique morphological features and ecological adaptations of C. spinosus, a research group led by Prof. Zhang Hui from the Institute of Oceanology of the Chinese Academy of Sciences (IOCAS) carried out deep sequencing of its genome. using Illumina short-read, PacBio long-read, and Hi-C techniques. They obtained a high-quality chromosome-level reference genome of C. spinosus in the Yangtze River Estuary. The results were published in Scientific Data on July 12.
The results show that the genome size of C. spinosus is approximately 624.7Mb, with a contig N50 length of about 13.77Mb and a scaffold N50 length of about 28.11Mb. A whopping 99.29% of the previously assembled sequences were successfully anchored to 24 chromosomes, and the genome contained 35.96% repeat sequences and 8,235 non-coding RNAs.
A total of 25,358 protein-coding genes were predicted, of which 24,072 genes (94.93%) were functionally annotated. Co-linearity analysis showed a significant co-linearity between C. spinosus and Cyclopterus lumpus, suggesting a possible close phylogenetic relationship between the two species.
“The assembled genome sequences will provide valuable information for elucidating the genetic adaptation and potential molecular basis of C. spinosus, which can be used to establish more effective management and conservation strategies for it that kind,” said Wang Yibang, first author of the study.
“This genomic data can also be used for future comparative genomics and phylogenetic studies, which may shed light on the genomic evolution and phylogeny of Scorpaeniformes and other teleost fish and vertebrates,” added Prof. Zhang.
Yibang Wang et al, Chromosome genome assembly and annotation of spiny red gurnard (Chelidonichthys spinosus), Scientific Data (2023). DOI: 10.1038/s41597-023-02357-y
Awarded by the Chinese Academy of Sciences
Citation: Scientists create high-quality chromosome-level reference genome of Chelidonichthys spinosus (2023, July 18) retrieved on July 18, 2023 from https://phys.org/news/2023-07-scientists-high -quality-chromosome-level-genome -chelidonichthys.html
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