Associate Professor of Biology, University of Massachusetts
Ph.D.: University of Wisconsin, Madison, 1992
Molecular and cellular mechanisms of vertebrate retinal development and retinal disease.
Our efforts at understanding retinal development address two fundamental questions: (1) How are different retinal cell types generated? (2) How are those cells organized into a functional tissue? Early in development, the retina consists of a seemingly homogenous population of multipotential progenitor cells. Later, this population generates many different cell types that are organized into specific cell layers and finally functional connections are made. We use zebrafish, which is a good model system for human retinal development; they have the same cell types and cells are organized in the same way. We are using genetics in zebrafish to identify genes that regulate the proliferation, differentiation, survival, and organization of retinal cells. The current focus of our lab is to understand the role of cell polarity in organization of the retina during development, and how loss of polarity can lead to degenerative retinal disease. We are examining the role of a novel gene we identified, called mosaic eyes (moe) , which plays a role in polarity. When this gene is mutated in zebrafish, the layers in the retina fail to form even though all the cell types that normally comprise the retina are present. We are using biochemistry and molecular and cell biological approaches to understand how moe and other molecules involved in establishing cell polarity regulate layer formation and cell polarity during development. We are also examining the role of moe in photoreceptor morphogenesis and photoreceptor degeneration.
Willoughby JJ, Jensen AM. (2011) Generation of a genetically encoded marker of rod photoreceptor outer segment growth and renewal. Biology Open. Nov 2.
Hsu YC, and Jensen AM. (2010) Multiple domains in the Crumbs Homologue 2a (Crb2a) protein are requiured for regulating rod photoreceptor size. BMC Cell Biology 11:60.
Christensen AK, Jensen AM. (2008) Tissue-specific requirements for specific domains in the FERM protein Moe/Epb4.115 during early zebrafish development. BMC Dev Biol. Jan 11;8:3.
Hsu YC, Willoughby JJ, Christensen AK, Jensen AM. (2006) Mosaic Eyes is a novel component of the Crumbs complex and negatively regulates photoreceptor apical size. Development. Dec;133(24):4849-59. Epub 2006 Nov 8.