ABSTRACT
We characterized the total mitochondrial genome of Australian spiny lobster, Panulirus cygnus (George, 1962), which is found along the western coast of Australia. Total mitochondrial genome length of P. cygnus was 15 724 bp, in which 13 proteins, 2 ribosomal RNAs, 22 transfer RNAs, and a putative control region were encoded. Nine and four protein-coding genes are encoded on the H-strand and on the L-strand, respectively. According to the phylogenetic analysis, P. cygnus was most closely related to Panulirus japonicus among the compared six species belonging to Palinuridae. Although overall gene organization was the same, the putative control region (between SrRNA gene and tRNAIlel) is least similar to one another among mitochondrial genomes from the compared six species belonging to Palinuridae.
Subject(s)
Genome, Mitochondrial , Palinuridae/genetics , Animals , Australia , Codon, Initiator , Open Reading Frames/genetics , Palinuridae/classification , Phylogeny , RNA, Ribosomal/chemistry , RNA, Ribosomal/genetics , RNA, Transfer/chemistry , RNA, Transfer/geneticsABSTRACT
We characterized the complete mitochondrial genome of Squilloides leptosquilla (Brooks, 1886) collected from the southern waters of Korea, which is newly recorded into the Korean carcinological fauna. The total mitochondrial genome length of S. leptosquilla was 16,376 bp. This circular DNA encodes 13 proteins, two ribosomal RNAs, and 22 transfer RNAs, as well as a putative control region. Compared with other decapod crustacean mitochondrial genomes, the overall A + T content was relatively high (71.1%) as those among other stomatopod species. Nine and four protein-coding genes are encoded on the H-strand and on the L-strand, respectively. The short non-coding region (210 bp) between tRNA(Glu) and tRNA(Phe) may be the good candidate as the molecular marker to discriminate S. leptosequilla from other stomatopods.
Subject(s)
Crustacea/genetics , Genome, Mitochondrial/genetics , Animals , Crustacea/classification , DNA Barcoding, Taxonomic , DNA, Mitochondrial/genetics , Genes, Mitochondrial/genetics , Phylogeny , RNA, Ribosomal/genetics , RNA, Transfer/genetics , Sequence Analysis, DNAABSTRACT
We determined the complete mitochondrial genome of Metapenaeopsis dalei (Rathbun, 1902), which is collected from East China Sea (124°E and 33.5°N). Total mitochondrial genome length of M. dalei was 15 939 bp, in which 13 proteins, two ribosomal RNAs, 22 transfer RNAs and a putative control region were encoded. The gene arrangement of M. dalei was well conserved with nine known Penaeidae mitochondrial genomes from COX1 to tRNATyr . The protein-coding genes started with ATN except for COX1 in which ACG is used. Four genes (COX2, COX3, ND3 and ND5) exhibited an incomplete stop codon. Nucleotide sequence identity of M. dalei mitochondrial genome to those of nine Penaeidae species ranged from 78% to 80%. Based on the COI region, M. dalei is most closely related to Penaeus notialis.
ABSTRACT
As in all other oviparous animals, lipoprotein receptors play a critical role in lipid metabolism and reproduction in decapod crustaceans. Four full-length cDNAs encoding lipoprotein receptors (Paj-VgR, Paj-LpR1, Paj-LpR2A, and Paj-LpR2B) were identified from Pandalopsis japonica through a combination of EST screening and PCR-based cloning. Paj-LpR1 appears to be the first crustacean ortholog of insect lipophorin receptors, and its two paralogs, Paj-LpR2A and Paj-LpR2B, exhibited similar structural characteristics. Several transcriptional isoforms were also identified for all three Paj-LpRs. Each expression pattern was unique, suggesting different physiological roles for these proteins. Paj-VgR is an ortholog of vitellogenin (Vg) receptors from other decapod crustaceans. A phylogenetic analysis of lipoproteins and their receptors suggested that the nomenclature of Vgs from decapod crustaceans may need to be changed. A PCR-based transcriptional analysis showed that Paj-VgR and Paj-LpR2B are expressed almost exclusively in the ovary, whereas Paj-LpR1 and Paj-LpR2A are expressed in multiple tissues. The various transcriptional isoforms of the three Paj-LpRs exhibited unique tissue distribution profiles. A transcriptional analysis of each receptor using tissues with different GSI values showed that the change in transcription of Paj-VgRs, Paj-LpR2A and Paj-LpR1 was not as significant as that of Vgs during maturation. However, the transcriptional levels of Paj-LpR2B decreased in ovary at maturation, suggesting that their transcriptional regulation is involved in reproduction.
