Volume 33 Issue 4
Jul.  2012
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LI Xin-Yi, LIN Yu-Shuang, ZHANG Hong-Wei. Phylogenetic analysis and expression patterns of tropomyosin in amphioxus. Zoological Research, 2012, 33(4): 389-394. doi: 10.3724/SP.J.1141.2012.04389
Citation: LI Xin-Yi, LIN Yu-Shuang, ZHANG Hong-Wei. Phylogenetic analysis and expression patterns of tropomyosin in amphioxus. Zoological Research, 2012, 33(4): 389-394. doi: 10.3724/SP.J.1141.2012.04389

Phylogenetic analysis and expression patterns of tropomyosin in amphioxus

doi: 10.3724/SP.J.1141.2012.04389
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  • Author Bio:

    LI Xin-Yi

  • Corresponding author: LI Xin-Yi
  • Received Date: 2012-01-06
  • Rev Recd Date: 2012-06-13
  • Publish Date: 2012-08-10
  • In amphioxus, we found a mesoderm related gene, tropomyosin,which encodes a protein comprising 284 amino acid residues, sharing high identities with other known Tropomyosin proteins both in vertebrates and invertebrates. Phylogenetically, amphioxus Tropomyosin fell outside the invertebrate clade and was at the base of the vertebrate protein family clade, indicating that it may represent an independent branch. From the early neurula to the larva stage, whole-mount in situ hybridization and histological sections found transcripts of amphioxus tropomyosin gene. Weak tropomyosin expression was first detected in the wall of the archenteron at about 10 hours-post-fertilization neurula stage, while intense expression was revealed in the differentiating presumptive notochord and the muscle. Transcripts of tropomyosin were then expressed in the formed notochord and somites. Gene expression seemed to continue in these developing organs throughout the neurular stages and remained till 72-hours, during the early larval stages. In situ study still showed tropomyosin was also expressed in the neural tube, hepatic diverticulum, notochord and the spaces between myotomes in adult amphioxus. Our results indicated that tropomyosin may play an important role in both embryonic development and adult life.
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