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Molecular and Cellular Biology, October 1999, p. 6815-6824, Vol. 19, No. 10
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Cooperation of Six and Eya in Activation of Their Target Genes through Nuclear Translocation of Eya

Hiromi Ohto,1 Sayaka Kamada,1 Kenji Tago,2 Shin-Ichi Tominaga,2 Hidenori Ozaki,1 Shigeru Sato,1 and Kiyoshi Kawakami1,*

Departments of Biology1 and Biochemistry,2 Jichi Medical School, Tochigi 329-0498, Japan

Received 3 May 1999/Returned for modification 7 June 1999/Accepted 6 July 1999

Drosophila sine oculis and eyes absent genes synergize in compound-eye formation. The murine homologues of these genes, Six and Eya, respectively, show overlapping expression patterns during development. We hypothesized that Six and Eya proteins cooperate to regulate their target genes. Cotransfection assays were performed with various combinations of Six and Eya to assess their effects on a potential natural target, myogenin promoter, and on a synthetic promoter, the thymidine kinase gene promoter fused to multimerized Six4 binding sites. A clear synergistic activation of these promoters was observed in certain combinations of Six and Eya. To investigate the molecular basis for the cooperation, we first examined the intracellular distribution of Six and Eya proteins in transfected COS7 cells. Coexpression of Six2, Six4, or Six5 induced nuclear translocation of Eya1, Eya2, and Eya3, which were otherwise distributed in the cytoplasm. In contrast, coexpression of Six3 did not result in nuclear localization of any Eya proteins. Six and Eya proteins were coimmunoprecipitated from nuclear extracts prepared from cotransfected COS7 cells and from rat liver. Six domain and homeodomain, two evolutionarily conserved domains among various Six proteins, were necessary and sufficient for the nuclear translocation of Eya. In contrast, the Eya domain, a conserved domain among Eya proteins, was not sufficient for the translocation. A specific interaction between the Six domain and homeodomain of Six4 and Eya2 was observed by yeast two-hybrid analysis. Our results suggest that transcription regulation of certain target genes by Six proteins requires cooperative interaction with Eya proteins: complex formation through direct interaction and nuclear translocation of Eya proteins. This implies that the synergistic action of Six and Eya is conserved in the mouse and is mediated through cooperative activation of their target genes.

* Corresponding author. Mailing address: Department of Biology, Jichi Medical School, 3311-1 Minamikawachi, Kawachi, Tochigi 329-0498, Japan. Phone: 81 (285) 58-7311. Fax: 81 (285) 44-5476. E-mail: kkawakam{at}jichi.ac.jp.

Molecular and Cellular Biology, October 1999, p. 6815-6824, Vol. 19, No. 10
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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