Th e mammalian intestine is responsible for the absorption of dietary nutrients and water, and
the excretion of waste materials. While selective exchange of compounds takes place between
the intestinal lumen and tissue, the intestine also has an important barrier function in denying
access to less desirable substances.1 To facilitate these specifi ed and diverse functions, the lumen
of the intestine is lined by a highly diff erentiated epithelium comprised of specialized absorptive
and secretory cells that display a wide-ranging, yet tightly regulated diversity in distribution and
gene expression along the cephalocaudal axis. Th is spatial diversity results in a well-organized
series of events taking place in diff erent regions of the intestine leading to an exquisite effi ciency
in the absorption of all necessary nutrients and water.2 Disease processes, congenital deviations
or inescapable resections, however, easily disrupt these events. Th us, to eventually develop strategies
to regenerate lost or defi cient intestinal function when gastrointestinal processes go awry, it
is essential to completely understand the molecular mechanisms underlying the development and
maintenance of the epithelium required for physiological functioning of the intestine.
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