Transcriptional readthrough of Hox genes Ubx and Antp and their divergent post-transcriptional control during crustacean evolution
| Autor: | Shigeo Hayashi, Hideo Yamagata, Rieko Takai, Hiromi Sakaguchi, Yasuhiro Shiga, Kazunori Sagawa |
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| Rok vydání: | 2006 |
| Předmět: |
animal structures
Transcription Genetic Biology Evolution Molecular Fusion gene Transcription (biology) Crustacea Animals RNA Messenger Cloning Molecular Promoter Regions Genetic Hox gene Post-transcriptional regulation Ecology Evolution Behavior and Systematics Ultrabithorax Body Patterning Homeodomain Proteins Genetics Cloning Messenger RNA RNA Gene Expression Regulation embryonic structures Antennapedia Homeodomain Protein Gene Fusion Developmental Biology |
| Zdroj: | Evolution Development. 8:407-414 |
| ISSN: | 1525-142X 1520-541X |
| DOI: | 10.1111/j.1525-142x.2006.00114.x |
| Popis: | Hox genes are in principle tandemly arranged in an order colinear with their order of expression along the anterior-posterior axis. Combinations of Hox proteins encode information that specifies the unique characteristics of axial regions in the metazoan body plan. The independent regulation of Hox genes achieved by differential promoter activity is essential for the expression of Hox proteins in distinct territories and thereby creating a full repertoire of Hox codes. Here we report the abundant expression of transcriptional readthrough products of two adjacent Hox genes, Ubx, and Antp, in five crustacean species of Branchiopoda and Malacostraca. Bicistronic mRNA places Antp under the control of the Ubx promoter, which is active in the posterior segments of two branchiopodans Daphnia and Artemia, and would normally reduce the complexity of Hox codes if translated. This does not occur, however, as the translational capability of the bicistronic mRNA is limited. In Daphnia, bicistronic Ubx/Antp mRNA produced no significant level of either UBX or ANTP. In Artemia, on the other hand, the bicistronic mRNA produced only UBX, and replaced the role of monocistronic Ubx mRNA. In this way, multiple post-transcriptional control mechanisms in two extant branchiopodans can be seen as preventing the potentially deleterious consequences of Hox gene fusion. |
| Databáze: | OpenAIRE |
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