Abstract
Transcription factors with a basic helix–loop–helix (HLH) motif have been shown to be crucial for various cell differentiation processes during development of multicellular organisms1. Id proteins inhibit the functions of these transcription factors in a dominant-negative manner by suppressing their heterodimerization partners through the HLH domains2,3,4. Members of the Id family also promote cell proliferation4,5, implying a role in the control of cell differentiation. Here we show that Id2 is indispensable for normal development of mice. Id2−/− mice lack lymph nodes and Peyer's patches. However, their splenic architecture is normal, exhibiting T-cell and B-cell compartments and distinct germinal centres. The cell population that produces lymphotoxins, essential factors for the development of secondary lymphoid organs6,7,8,9,10,11, is barely detectable in the Id2−/− intestine. Furthermore, the null mutants show a greatly reduced population of natural killer (NK) cells, which is due to an intrinsic defect in NK-cell precursors. Our results indicate that Id2 has an essential role in the generation of peripheral lymphoid organs and NK cells.
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Acknowledgements
We thank H. Yoshida, N. Mitato, M. Matsumoto, T. Yamada, S. Takeda, K.Ogasawara and R. Benezra for valuable discussions and suggestions; T. Yagi, T. Neuman, S. Itohara, H. Yoshida, T. Takemori, M. Miyasaka, T. Nishimura, E. Nakamura, N. Minato, H. Kawamoto and Y.Katsura for providing materials; R. Liebal for supporting the mouse work; J. Krull, Y. Tsuji, S.-H. Park, M. Tanji, T. Kikuchi and M. Hirashima for assistance; and R. Altschäffel for photographic work. This work was supported by the Max-Planck Soceity, the Ministry of Education, Science and Culture of Japan, and the Yamanouchi Foundation. Y.Y. was supported by the Alexander von Humboldt Foundation, the Jeantet-Foundation and the Human Frontier Science Program.
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Yokota, Y., Mansouri, A., Mori, S. et al. Development of peripheral lymphoid organs and natural killer cells depends on the helix–loop–helix inhibitor Id2. Nature 397, 702–706 (1999). https://doi.org/10.1038/17812
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DOI: https://doi.org/10.1038/17812