Elucidating the Role of Menin During Islet Cell Development in the Human Fetal Pancreas
-Dubrick, Jessica L., (2013).
University of Western Ontario - Electronic Thesis and Dissertation Repository. Paper 1287.
Menin functions as a tumor suppressor in adult endocrine cells, but in the fetal pancreas promotes cell survival and proliferation. At first glance these roles seem very different, almost opposite. But are they really opposed?
If menin promotes the proliferation of healthy pancreas cells -in particular, cells with at least one functional MEN1 gene- then it would seem that these cells will proliferate faster than those unable to produce menin. So, cells that are unable to produce menin will represent a decreasing fraction of the cell population. Therefore, even during fetal development, menin's role as a growth promoter offers a tumor suppressive advantage to the developing pancreas, by reducing the percentage of cells that later may pose a tumorigenic risk due to their inability to express menin.
Unless I've got that wrong.