Sgn1, a basic helix-loop-helix transcription factor delineates the salivary gland duct cell lineage in mice.

The salivary system in mammals is comprised of three independently developed pairs of organs, the parotid, submaxillar, and sublingual glands. Each gland is composed of various ductal and acinar cell types that fulfill multiple roles. However, the molecular mechanisms regulating their biogenesis and functions are still largely unknown. In this ...
paper, we report that two class B basic helix-loop-helix (bHLH) transcriptional regulators delineate the ductal and the acinar cells in salivary glands. Sgn1, a novel class B bHLH factor, is specifically expressed in the salivary duct cells, while the acinar cells are characterized by the expression of another class B bHLH factor, Mist1. The molecular nature of Sgn1 was also investigated: it binds to specific sequences of DNA as a dimer with a class A bHLH factor and acts as a negative transcriptional regulator against other bHLH factors. This study provides an important cue towards better understanding of the generation and function of multiple cell types in salivary glands. In addition, Sgn1 expression exhibits a reverse relationship with the development of male phenotypes, suggesting its role in gender dimorphism in the salivary glands.
Mesh Terms:
Amino Acid Sequence, Animals, Base Sequence, Basic Helix-Loop-Helix Transcription Factors, Chromosome Mapping, DNA, Complementary, Female, Gene Expression Regulation, Developmental, Helix-Loop-Helix Motifs, Humans, In Situ Hybridization, Male, Mice, Mice, Transgenic, Molecular Sequence Data, Salivary Glands, Sequence Homology, Amino Acid, Sex Characteristics, Transcription Factors
Dev. Biol.
Date: Dec. 15, 2001
Download Curated Data For This Publication
120298
Switch View:
  • Interactions 10