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Molecular and Cellular Biology, May 2000, p. 3292-3307, Vol. 20, No. 9
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Regulation of the Pancreatic Islet-Specific Gene BETA2 (neuroD) by Neurogenin 3

Hsiang-Po Huang, Min Liu, Heithem M. El-Hodiri, Khoi Chu, Milan Jamrich, and Ming-Jer Tsai*

Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030

Received 26 October 1999/Returned for modification 13 December 1999/Accepted 10 January 2000

The BETA2 (neuroD) gene is expressed in endocrine cells during pancreas development and is essential for proper islet morphogenesis. The objective of this study is to identify potential upstream regulators of the BETA2 gene during pancreas development. We demonstrated that the expression of neurogenin 3 (ngn3), an islet- and neuron-specific basic-helix-loop-helix transcription factor, partially overlaps that of BETA2 during early mouse development. More importantly, overexpression of ngn3 can induce the ectopic expression of BETA2 in Xenopus embryos and stimulate the endogenous RNA of BETA2 in endocrine cell lines. Furthermore, overexpression of ngn3 could cause a dose-dependent activation on the 1.0-kb BETA2 promoter in islet-derived cell lines. Deletion and mutation analyses revealed that two proximal E box sequences, E1 and E3, could bind to ngn3-E47 heterodimer and mediate ngn3 activation. Based on these results, we hypothesize that ngn3 is involved in activating the expression of BETA2 at an early stage of islet cell differentiation through the E boxes in the BETA2 promoter.

* Corresponding author. Mailing address: Department of Molecular and Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030. Phone: (713) 798-6253. Fax: (713) 798-8227. E-mail: mtsai{at}bcm.tmc.edu.

Molecular and Cellular Biology, May 2000, p. 3292-3307, Vol. 20, No. 9
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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