AI Article Synopsis

  • The sea cucumber Apostichopus japonicus is important as both a traditional food and a cultured aquatic species, known for its resilience to environmental stress and its ability to regenerate.
  • Research suggests that its responses to environmental changes may involve epigenetic modifications, specifically DNA methylation mediated by DNMT genes, with this study providing insights into the previously unidentified DNMT3 gene in A. japonicus.
  • The DNMT3 gene shows conservation in the Echinodermata phylum, displaying specific expression in the sea cucumber's testis, which differs from its expression pattern in the starfish, highlighting the variability in gene expression across species within the same group.

Article Abstract

The sea cucumber Apostichopus japonicus is well known as a traditional tonic food and as a commercially important cultured aquatic species. This species produces saponins, and has a high potential to cope with environmental stress, such as aestivation, organ regeneration, and wound healing. Recently, several studies have shown that cellular reprogramming and the physiological responses of the sea cucumber to environmental changes, including aestivation, are potentially mediated by epigenetic DNA methylation. The DNA methyltransferase (DNMT)1 and DNMT3 genes are independent participants in the maintenance and de novo methylation of specific sequences. Sea urchin (Strongylocentrotus purpuratus) and starfish (Asterina pectinifera), which belong to the same phylum as A. japonicus, have both DNMT1 and DNMT3 genes. However, it was previously reported that DNMT1 is present, but DNMT3 is absent, in A. japonicus. In the present study, we sequenced the full-length cDNA of the A. japonicus DNMT3 gene. The newly sequenced DNMT3 gene comprises three major conserved domains (Pro-Trp-Trp-Pro (PWWP), plant homeodomain (PHD), and S-adenosylmethionine-dependent methyltransferase (AdoMet-MTase)), indicating that the DNMT3 possibly has de novo DNA methylation catalytic activity. Gene structure and phylogenetic analysis showed that sea cucumber DNMT3 is evolutionarily conserved in the Echinodermata. Next, we demonstrated the conservation of DNMT3 gene expression in sea cucumber and starfish belong to same phylum, echinoderm. Using reverse transcription-polymerase chain reaction, sea cucumber DNMT3 mRNA was detected in testis tissue, but not in other tissues tested, including the respiratory tree, muscle, tentacle, intestine, and ovary. This is inconsistent with previous reports, which showed the expression of DNMT3 in ovary, but not in testis of the starfish A. pectinifera, indicating the tissue- and species-specific expression of DNMT3 gene. Although further studies are needed to clarify the epigenetic regulatory mechanisms of DNMT3 and its application to the aquaculture industry, our findings may provide insights into the sea cucumber biology.

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http://dx.doi.org/10.1007/s11033-019-04821-8DOI Listing

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