Abstract
There are few systems which enable adult tissue stem cells to be studied. However, the gastrointestinal tract with its high degree of polarity, well-defined cell migratory pathways, and dynamic cell replacement is a model tissue providing unique opportunities for stem cell study. Lineage tracking indicates that all cell replacement originates at well-defined stem cell positions, with an associated slower cell cycle. Radiobiological studies suggest a hierarchical stem cell compartment (actual and potential stem cells). Actual stem cells have an intolerance of genotoxic damage and die via apoptosis. Stem cells also selectively sort the old and new DNA strands at division, retaining the replication error free strands in the stem cell daughter. High genotoxic sensitivity and selective sorting of old and new DNA strands, provides extremely effective protective mechanisms against both replication and random errors. This provides a new explanation for the low cancer risk in the small intestine.
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Potten, C.S., Ellis, J.R. (2006). Adult Small Intestinal Stem Cells: Identification, Location, Characteristics, and Clinical Applications. In: Morser, J., Nishikawa, S.I., Schöler, H.R. (eds) Stem Cells in Reproduction and in the Brain. Ernst Schering Research Foundation Workshop, vol 60. Springer, Berlin, Heidelberg . https://doi.org/10.1007/3-540-31437-7_7
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DOI: https://doi.org/10.1007/3-540-31437-7_7
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