Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Maestro, M.A. et al.

Hnf6 and Tcf2 (MODY5) are linked in a gene network operating in a precursor cell domain of the embryonic pancreas.

During pancreatic organogenesis endocrine cells arise from non self-renewing progenitors that express Ngn3. The precursors that give rise to Ngn3+ cells are presumably located within duct-like structures. However, the nature of such precursors is poorly understood. We show that, at E13-E18, the embryonic stage during which the major burst of beta-cell neogenesis takes place, pancreatic duct cells express Hnf1beta, the product of the maturity-onset diabetes of the young type 5 (MODY5) gene. Ngn3+ cells at this stage invariably cluster with mitotically competent Hnf1beta+ cells, and are often intercalated with these cells in the epithelium that lines the lumen of primitive ducts. We present several observations that collectively indicate that Hnf1beta+ cells are the immediate precursors of Ngn3+ cells. We furthermore show that Hnf1beta expression is markedly reduced in early pancreatic epithelial cells of Hnf6-deficient mice, in which formation of Ngn3+ cells is defective. These findings define a precursor cellular stage of the embryonic pancreas and place Hnf1beta in a genetic hierarchy that regulates the generation of pancreatic endocrine cells.[1]

References

Hnf6 and Tcf2 (MODY5) are linked in a gene network operating in a precursor cell domain of the embryonic pancreas. Maestro, M.A., Boj, S.F., Luco, R.F., Pierreux, C.E., Cabedo, J., Servitja, J.M., German, M.S., Rousseau, G.G., Lemaigre, F.P., Ferrer, J. Hum. Mol. Genet. (2003) [Pubmed]

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