We are studying the molecular mechanisms by which a BMP (Bone Morphogenetic Protein) signal transduction pathway establishes different aspects of the vertebrate body plan. Various zebrafish mutants of BMP pathway components, as well as antisense knockdown approaches are used to dissect the molecular mechanisms by which this pathway establishes different cell types. We are studying the formation, function, and temporal regulation of a BMP activity gradient, which is implicated in specification of diverse cell types along the dorsal-ventral axis. We have shown that this gradient is essential in neural crest specification and is linked to dorsal-ventral patterning of neural tissue. Moreover, a subset of our defined components also function in post-embryonic heart development. Misregulation of BMP signaling leads to a debilitating disease in humans called FOP. We are currently trying to establish a model for FOP in the zebrafish.
Elaboration of the vertebrate body plan relies not only on zygotic processes, but also on maternally-controlled processes. That is, processes that depend on products derived from the mother that are deposited into the oocyte and are critical for proper development of the embryo. To this end we performed a large-scale maternal-effect mutant screen, not previously performed in a vertebrate, to identify mutants of key genes specifically required in the mother for oocyte development, egg activation, fertilization, the midblastula transition, and establishment of the axes of the vertebrate embryo. We identified numerous mutants in these processes and are studying the molecular and cellular basis for the defects, including positional cloning of the mutated genes.
- A New Paper from the Mullins Lab
Doctor Mullins contributes to the paper Evaluation of BMP-mediated patterning in a 3D mathematical model of the zebrafish blastula embryo. Li L, Wang X, Mullins MC, Umulis DM.
- Congratulations to Dr. Robyn Allen and Dr. Francesca Tuazon!
Congratulations to Mullins Lab Graduate students Robyn Allen and Francesca Tuazon who both defended on the same day!
- A Warm Welcome to Willius!
Graduate student William (a.k.a. Willius) Jones joins the lab, becoming our newest graduate student! He will be working on the zebrafish ints6 mutant and its effects on embryonic development.
- New Paper from the Mullins Lab!
Graduate student Allison Jamieson-Lucy and Mary Mullins publish a new review titled "The vertebrate Balbiani body, germ plasm, and oocyte polarity."
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