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Gene Expr Patterns. 2010 Sep;10(6):306-13. doi: 10.1016/j.gep.2010.07.001. Epub 2010 Jul 4.

An oligochaete homologue of the Brachyury gene is expressed transiently in the third quartette of micromeres.

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  • 1Division of Biological Sciences, Graduate School of Science, Hokkaido University, Kita-10, Nishi-8, Kita-ku, Sapporo 060-0810, Japan.

Abstract

We have isolated a Brachyury homologue (Ttu-Bra) from the oligochaete annelid Tubifex tubifex which displays a direct mode of development. Developmental RT-PCR analysis showed that Ttu-Bra transcripts are present in embryos at stages 9-11, 16 and 17, but undetectable at the remaining embryonic stages. Whole-mount in situ hybridization demonstrated that Ttu-Bra is expressed transiently in the third quartette of micromeres, which are located at the prospective stomodaeum (at stages 9-11). The second burst of Ttu-Bra expression occurs at the posterior end of stage 16 embryo that undergoes body elongation. Ttu-Bra-expressing cells, which are organized in a circle at stage 16, become aggregated at the proctodaeum at stage 17. Consistent with the results of the RT-PCR analysis, there is no sign of Ttu-Bra-expressing cells in embryos that undergo gastrulation during stages 12-15.

Copyright 2010 Elsevier B.V. All rights reserved.

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