Professor G. Paolo Dotto (MD, PhD)

Professor G. Paolo Dotto received his MD from the University of Turin, Italy, in 1979, and his PhD in Genetics from the Rockefeller University, New York, in 1983, followed by postdoctoral training with Robert A. Weinberg at the Whitehead Institute/MIT in Cambridge, Massachusetts.

In 1987 Prof. Dotto joined Yale University, New Haven, Connecticut, as assistant professor of Pathology. In 1992 he was promoted to the rank of associate professor and soon after moved to Harvard Medical School, as associate professor of Dermatology in the newly established Cutaneous Biology Research Center. In 2000 he was promoted to the rank of Professor at Harvard Medical School and Biologist at Massachusetts General Hospital. In 2002 he accepted a position of Professor in the Department of Biochemistry at the University of Lausanne, while retaining his position of Biologist at Massachusetts General Hospital.

Prof. Dotto has been elected to the European Molecular Biology Organization (2011), the Academia Europaea (2012) and the Leopoldina German National Academy of Sciences (2014) and is the recipient of a number of awards, including the American Skin Association Achievement Award (2012) and an Advanced ERC investigator grant award (2013).

 

Research Interests

Cancers are ultimately formed as a result of uncontrolled cellular proliferation but they do not arise solely from a single deregulated group of cells but rather as a combined result of various alterations in organ and tissue homeostasis. In fact, for reasons that are not yet understood, only a minor fraction of pre-malignant lesions progress to malignancy and many genetic changes found in invasive and metastatic tumors are also found in apparently normal tissues.

Our main research focuses are on the biological determinants of pre-malignant to malignant tumor conversion and on field cancerization, a process of major clinical significance that consists of multifocal and recurrent tumors that are associated with widespread changes of surrounding normal tissues. We primarily work with skin cells as an experimental system and look at Notch signaling as an entry point for understating the complexity of cancer-determining signals. More recently, we have also started exploring genetic and epigenetic determinants of the cancer variability observed across gender and race. This is a topic of great interest as there are significant differences in cancer susceptibility found across gender and race that cannot solely be attributed to socioeconomic and behavioral factors and instead, are likely the result of interplay between environmental and biological factors.

On the basis of the bad seed / bad soil hypothesis illustrated below, two main topics are being addressed : (i) intrinsic control mechanisms underlying the opposing balance between epithelial cell differentiation and cancer; (ii) role of underlying mesenchymal cells in control of epithelial tumorigenesis.

Field Cancerization : bad seed / bad soil hypothesis. Environmental insults, like UV irradiation or smoke, can target both epithelial and stromal compartments of organs such as skin, head/neck, lung, bladder or breast, with ensuing genetic and/or epigenetic changes. Establishment and spreading of “cancer fields” is the likely result of an interplay between epithelial and stromal alterations, with the latter playing an equally important and possibly primary role. The situation leading to multifocal and recurrent neoplastic lesions may be analogous to that of a bad plant difficult to eradicate. This may be due to roots deeply embedded in the terrain or the spreading of bad multiple seeds, growing in the presence of a permissive or favorable soil. An alternative possibility with important conceptual implications is that the main problem is the soil itself. A bad soil could corrupt properties of otherwise perfectly good plants or seeds. According to this view, unless the soil is corrected, various forms of prevention and intervention would be of little or no use.

 


Relevant Publications

 

  1. Hu, B, Castillo, E., Harewood, L., Ostano, P., Reymond, A., Dummer, R., Raffoul, W., Hoetzenecker, W., Hofbauer, G.F.L. and Dotto, G.P. (2012) Loss of mesenchymal CSL signaling leads to field cancerization and multifocal epithelial tumor development. Cell, 149, 1207–1220
  2. Dotto, G.P. Multifocal epithelial tumors and field cancerization: stroma as a primary determinant. J Clin Invest. 2014, 124 :1 446-53
  3. Procopio et al. 2015 (Procopio, M.G., Laszlo, C., Al Labban, D., Eun Kim, D., Bordignon, P., Jo, S., Goruppi, S., Menietti, E., Ostano, P., Ala, U., Provero, P., Hoetzenecker, W., Neel, V., Kilarski, W., Swartz, M.A., Brisken, C., Lefort1, K. and Dotto, G.P. (2015) Combined CSL and p53 downregulation promotes cancer-associated fibroblast activation. Nature Cell Bio. 17, 1193–1204.
  4. Clocchiatti, A., Cora, E.,, Zhang, Y. and Dotto, G.P. Sexual dimorphism in cancer. Nature Reviews Cancer 2016  16: p. 330-9
  5. Dotto, G.P, and Rustgi, A., Squamous cell cancers: a unified perspective on biology and genetics. Cancer Cell 2016, in press.
  6. Ozdemir, B. and Dotto, G.P., Racial Differences in Cancer Susceptibility and Survival: More Than the Color of the Skin? Trends in Cancer, 2017, 3, 181-197
  7. Kim, D.E, Procopio,M.G., Ghosh, S., Jo, S.H, Goruppi, S., Magliozzi, F., Bordignon, P., Neel, V., Angelino,P.and Dotto G.P. (2017) Convergent roles of ATF3 and CSL in chromatin control of cancer-associated fibroblast activation. J. Exp. Med. 214, 1-20, doi: 10.1084/jem.20170724