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Cloning and developmental expression of amphioxus Dachschund.
Simona Candiani1, Jana Kreslova, Vladimir Benes
1Dipartimento di Biologia Sperimentale, Ambientale e Applicata, Università di Genova, viale Benedetto XV 5, 16132 Genova, Italy.
Gene Expression Patterns : GEP
|March 1, 2003
Summary
Researchers identified the dachshund (dac) gene in amphioxus, revealing its conserved role in eye and nervous system development across species. This finding highlights evolutionary links in developmental biology.
Area of Science:
- Developmental Biology
- Evolutionary Biology
- Genetics
Background:
- The nuclear factor dachshund (dac) is crucial for eye and leg development in Drosophila.
- Understanding the evolutionary conservation of developmental genes is key to deciphering complex biological processes.
Purpose of the Study:
- To clone and characterize the Dachshund homologue in the invertebrate chordate amphioxus (Branchiostoma floridae).
- To investigate the expression patterns of amphioxus Dachshund (AmphiDach) during embryonic and larval development.
- To compare AmphiDach expression with known Dachshund patterns in vertebrates and Drosophila to infer evolutionary conservation.
Main Methods:
- Gene cloning and sequencing of the Dachshund homologue from amphioxus.
- Whole-mount in situ hybridization to determine AmphiDach expression patterns at different developmental stages (gastrula, neurula, larva).
- Comparative sequence analysis to assess similarity with known dachshund genes.
Main Results:
- Amphioxus Dachshund (AmphiDach) was successfully cloned, showing high sequence similarity to Drosophila and vertebrate dachshund genes.
- AmphiDach expression was observed in the paraxial mesoderm, somites, anterior endoderm, cerebral vesicle, pharynx endoderm, photoreceptive neurons, infundibular organ, endostyle, Hesse organs, and nerve cord.
- Expression patterns in somites, photoreceptor cells, and the central nervous system show conservation with vertebrates.
Conclusions:
- AmphiDach plays a conserved role in the development of sensory organs (eyes) and the central nervous system, similar to its counterparts in other species.
- While some expression patterns are conserved, AmphiDach's localization in the endostyle suggests potential novel functions or evolutionary divergence in chordates.