John TowerProfessor of Biological Sciences
Phone: (213) 740-5384
Office: RRI 219C
John Tower received his PhD in 1988 from The Johns Hopkins University School of Medicine, Biochemistry, Cellular, and Molecular Biology Training Program, where he worked under the direction of Dr. Barbara Sollner-Webb on the topic of rDNA transcriptional regulation. He subsequently undertook postdoctoral training with Dr. Allan C. Spradling, at the Department of Embryology, Carnegie Institution of Washington, in Baltimore, where he began ongoing studies on Drosophila P element mutagenesis and chorion gene amplification. In 1991 he joined the faculty in the Department of Biological Sciences, University of Southern California, in what is now the Molecular and Computational Biology Program. Dr. Tower has been investigating the molecular genetics of aging in Drosophila since 1989, with a particular emphasis on transgenic technologies, hsps, superoxide dismutase and p53.
- Ph.D. Biochemistry, Cellular and Molecular Biology Training Program, The Johns Hopkins University School of Medicine, 1988
- Postdoctoral fellow, The Carnegie Institution of Washington, Dept of Embryology, Baltimore, 1988-1991
- Professor Biological Sciences, University of Southern California, 2010-
- Associate Professor Biological Sciences, University of Southern California, 1999-2010
- Assistant Professor Biological Sciences, University of Southern California, 1991-1999
- Helen Hay Whitney Memorial Foundation Fellow, Carnegie Institution of Washington, Baltimore, 1988-1991
- Shen, J., Tower, J. (2013). Aging, MnSOD, and hormesis mechanisms converge on liver mUPR. Cell Cycle. Vol. 12 (202013/09/17), pp. 3237-8.
- Tower, J., Landis, G., Gao, R., Luan, A., Lee, J., Sun, Y. (2013). Variegated Expression of Hsp22 Transgenic Reporters Indicates Cell-specific Patterns of Aging in Drosophila Oenocytes. J Gerontol A Biol Sci Med Sci. (2013/06/01)
- Tower, J. (2012). Stress and stem cells. Wiley Interdiscip Rev Dev Biol. Vol. 1 (62013/06/27), pp. 789-802.
- Landis, G., Shen, J., Tower, J. (2012). Gene expression changes in response to aging compared to heat stress, oxidative stress and ionizing radiation in Drosophila melanogaster. Aging (Albany NY). Vol. 4 (112012/12/06), pp. 768-89.
- Ardekani, R., Huang, Y. M., Sancheti, P., Stanciauskas, R., Tavare, S., Tower, J. (2012). Using GFP video to track 3D movement and conditional gene expression in free-moving flies. PLoS One. Vol. 7 (72012/07/26), pp. e40506.
Academic Appointment, Affiliation, and Employment History
Tenure Track Appointments
Description of Research
Summary Statement of Research Interests
Professor Tower's research primarily focuses on the following two areas: the molecular genetics of aging in Drosophila and Drosophila chorion gene amplification. He is taking two approaches to his research on aging, the first of which identifies genes that directly regulate life span. His current emphasis with these techniques is to test candidate genes involved in regulating oxidative stress responses and nuclear-mitochondrial signaling. He is particularly interested in how the post-mitotic muscle, nerve and liver cells of the adult maintain function during aging, and how stem cells populations are maintained in the ovary. These studies have identified p53 and sexual differentiation as key contributors to aging. The second general approach he uses is studying the regulation of heat shock gene expression as a function of age, in particular the hsp70 and hsp22 genes: increased expression of these genes has been found to be a biomarker of aging. In his investigation of chorion gene amplification, Professor Tower has cloned and characterized two amplification trans-regulators, k43 and chiffon, and found that they are related to origin regulatory proteins in yeasts, ORC2 and Dbf4 respectively. Prior analysis of cis-sequence elements and their relationship to origins was hampered by severe chromosomal position effects. He found that flanking the ends of transgenic constructs with transcriptional insulator elements, called "Suppressor of Hairy-wing protein binding sites" (SHWBSs) protected the constructs from position effects. The data implicated chromatin structure in origin regulation, and provided a powerfully improved assay. Using such buffered constructs he has been able to analyze cis-sequence requirements and functions in detail. Professor Tower found that functionally distinct, sequence-specific replicator and origin elements are required for amplification.
aging, hsp70, hsp22, oxidative damage, ROS, life span, stem cells, replicative senescence, DNA replication origins, drosophila chorion gene amplification, replicator, follicle cells, biological scienc
Aging and Development Biology, DNA replication, Signal Transduction and Gene Regulation
- Department of Biological Sciences
- University of Southern California
- Allan Hancock Foundation Building
- Los Angeles, CA 90089-0371
- Phone: (213) 740 - 1109
- Email: firstname.lastname@example.org