Learn More
Methyl farnesoate (MF) is the crustacean homolog of the insect juvenile hormone and is believed to regulate growth and reproduction in crustaceans. Farnesoic acid O-methyltransferase (FAMeT) catalyzes the conversion of farnesoic acid (FA) to MF. Here we report the cloning and characterization of two forms of FAMeTs (i.e. LvFAMeT-S and LvFAMeT-L) from the(More)
Whole-genome duplication (WGD) results in new genomic resources that can be exploited by evolution for rewiring genetic regulatory networks in organisms. In metazoans, WGD occurred before the last common ancestor of vertebrates, and has been postulated as a major evolutionary force that contributed to their speciation and diversification of morphological(More)
MicroRNAs (miRNA) are small non-coding RNAs that act post-transcriptionally to regulate gene expression levels. Some studies have indicated that microRNAs may have low homoplasy, and as a consequence the phylogenetic distribution of microRNA families has been used to study animal evolutionary relationships. Limited levels of lineage sampling, however, may(More)
Vitellogenins and other large lipid transfer proteins (LLTP) are well known to play significant roles in the development, metabolism and reproduction of animals. Comparative genomics and phylogenetic analyses of LLTPs using the most comprehensive dataset in metazoans to date are carried out. Our analyses demonstrate that LLTP genes arose significantly(More)
An additional vitellogenin gene (MeVg2) that is structurally different from MeVg1 was cloned and characterized from the shrimp Metapenaeus ensis. The MeVg2 gene consists of fewer exons-introns and is most likely evolved from the MeVg1 gene. The cDNA for MeVg2 is 8.0 kilobases (kb) in size, and the deduced MeVg2 precursor shared an overall 54% amino sequence(More)
During gonad maturation, female shrimp accumulate the major egg yolk protein vitellin (Vn) in premolt stage, and the process of molting and reproduction is synchronized. Using a polyclonal anti-Vn antibody, immunopositive signals could be detected in the ovary and among the proteins secreted by the hepatopancreas by Western blot. In the ovary, Vn(More)
The Hox gene cluster is renowned for its role in developmental patterning of embryogenesis along the anterior-posterior axis of bilaterians. Its supposed evolutionary sister or paralog, the ParaHox cluster, is composed of Gsx, Xlox, and Cdx, and also has important roles in anterior-posterior development. There is a debate as to whether the cnidarians, as an(More)
Genes with the homeobox motif are crucial in developmental biology and widely implicated in the evolution of development. The Antennapedia (ANTP)-class is one of the two major classes of animal homeobox genes, and includes the Hox genes, renowned for their role in patterning the anterior-posterior axis of animals. The origin and evolution of the ANTP-class(More)
During evolution of animals, their co-evolution with bacteria has generally been ignored. Recent studies have provided evidences that the symbiotic bacteria in the animal gut can either be essential or contributing to the plasticity of the host. The Crustacea includes crab, crayfish, lobster, and shrimp and represents the second largest subphylum on the(More)
Juvenile hormone (JH) and methyl farnesoate (MF) play well-known roles in the development and reproduction of insects and crustaceans. Juvenile hormone acid O-methyltransferase (JHAMT) and farnesoic acid O-methyltransferase (FAMeT) are the enzymes responsible for catalyzing the biosynthesis of JH and MF, respectively. It is not clear whether the genes that(More)