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The intertidal harpacticoid copepod Tigriopus japonicus (Crustacea: Copepoda) beta-actin gene: cloning, sequence and
Il-Chan Kim1, Young Ja Kim, Sung Joon Song
1Department of Biochemistry, College of Medicine, Hanyang University, Seoul 133-791, South Korea.
Abstract:
The Tigriopus japonicus beta-actin genes were amplified from genomic DNA by polymerase chain reaction (PCR) and cloned into pCRII vector. Several clones of the T. japonicus beta-actin gene spanned 1662-1676 bp with gains or losses of some bases in intron 3 or 4 but they consisted generally of 5 exons and 4 introns with very high homology, implying polymorphism of this gene. The exon and intron boundaries were matched with the GT/AG rule. The T. japonicus beta-actin gene showed high homology to the fish (Rivulus marmoratus) and human genes, 99.2 and 98.4%, respectively at the amino acid sequence level. The phylogenetic implications inferred from the T. japoncius beta-actin gene are discussed.
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