Links to PubMed are also available for Selected References. Get a printable copy PDF file of the complete article K , or click on a page image below to browse page by page. Hydroxyurea treatment was used for isolation in both cases. This article has been cited by other articles in PMC. Full text Full text is available as a scanned copy of the original print version.
Foot tissue was cut out from normal nem-1polyps male , and allowed to regenerate. Sex reversal from egg-restricted to sperm-restricted stem cells occurred 3 times during this period. These observations suggest that strain nem-1 male contains 3 types of interstitial stem cell subpopulations: Hydroxyurea treatment was used for isolation in both cases. To test the sexual stability of these clones, stem cells were recloned. As a result, female polyps contain only female stem cells; male polyps contain a mixture of male and female stem cells. Evidence is presented which suggests that similar "phenotypic males", which normally only produce sperm but contain the stem cell types capable of differentiating into eggs, occur widely in Hydra magnipapillata. Another subpopulation restricted to the egg differentiation pathway was also isolated from the same strain. The results indicate that stem cells from female clones are stable in their sexual differentiation capacity; male stem cells, by comparison, switch sexual phenotype at the rate of per cell per generation. This article has been cited by other articles in PMC. A subpopulation of interstitial stem cells restricted to the sperm differentiation pathway was isolated previously from strain nem-1 male. These and other results suggest that the foot tissue contains multi-potent stem cells capable of differentiating into eggs during sexual differentiation. Links to PubMed are also available for Selected References. Get a printable copy PDF file of the complete article K , or click on a page image below to browse page by page. A model is presented in which the sexual phenotype of Hydra polyps is controlled by i the switching rate of male and female stem cells and ii the repression of female differentiation by male stem cells. Abstract Single interstitial stem cells of male polyps of Hydra magnipapillata give rise to clones that differentiate either male or female gametes. Full text Full text is available as a scanned copy of the original print version. The regenerates produced eggs but no sperm upon sex induction. Both of these two stem cell types are numerous in the central gastric region of the pseudo-epithelial hydra, but absent in the foot region below the budding zone. A possible relationship between phenotypic male hydra and hermaphroditic hydra is discussed. Upon sex induction, however, differentiation of eggs by the latter two types is suppressed, and only sperm are produced by the sperm-restricted stem cells.
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