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  • Transcriptional regulation of Tal2 gene by all-trans retinoic acid (atRA) in P19 cells.

Transcriptional regulation of Tal2 gene by all-trans retinoic acid (atRA) in P19 cells.

Biological & pharmaceutical bulletin (2014-12-09)
Takanobu Kobayashi, Masayo Suzuki, Masayuki Morikawa, Katsuhito Kino, Sei-ichi Tanuma, Hiroshi Miyazawa
ABSTRACT

TAL2 is a transcription factor required in the normal development of mouse brain. In a previous study, we demonstrated that the expression of Tal2 gene is induced by the complex of all-trans retinoic acid (atRA) and retinoic acid receptor α (RARα) in mouse embryonal carcinoma P19 cells. atRA is also known to be important in inducing P19 cells to differentiate into the neural lineage. Therefore, we believe that the function of TAL2 in neural differentiation may be clarified by utilizing P19 cells. As the atRA-RARα complex induced the expression of Tal2, we focused on the regulatory region that is involved in its transcription. The atRA-RARα complex occupies a characteristic retinoic acid response element (RARE) located in the promoter of target genes. Therefore, we searched for RARE on the mouse Tal2 and found that a RARE-like element was located in the intron. We also found that a TATA-box-like element was located in the 5'-region of Tal2. Involvement between transcriptional activity and the TATA-box-like element was confirmed in the luciferase assay, and TATA-box binding protein was bound to this element upstream of Tal2 in P19 cells. atRA signaling activated the transcription through the RARE-like element, and RARα was bound to this element on Tal2 in P19 cells. In addition, the interaction between these elements on Tal2 was shown in the chromatin immunoprecipitation assay. These results suggest that the transcription of Tal2 is coordinately mediated by two distal regulatory elements.

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