Abstract
Apoptosis is a central regulatory feature of the immune system, and the most common form of death among immunological cells. However, the function of apoptosis, within the innate immune system of invertebrates, remains largely unknown. For this reason, we investigated the immune functionality of two apoptosis genes, caspase and nm23, in the Chinese mitten crab (Eriocheir sinensis), which is a commercially important and disease vulnerable aquaculture species. The entire length caspase and nm23 cDNA genes were cloned using PCR, based on an initial expressed sequence tag (EST) isolated from a hepatopancreatic cDNA library. The caspase cDNA contained an 1119 bp open reading frame that encoded a putative 372 amino acid protein, while nm23 cDNA contained a 456 bp open reading frame that encoded a putative 151 amino acid protein. Comparison, with other reported invertebrate and vertebrate sequences, revealed the presence of conserved enzyme active sites that were common among caspase and nm23 superfamilies. In brief, caspase and nm23 mRNA expression in E. sinensis were (a) both detected in all tissues, including the hemocytes, heart, hepatopancreas, gill, stomach, muscle, intestine, brain and eyestalk, and (b) responsive in hemocytes,...Continue Reading
Citations
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