Zbtb7c is a critical gluconeogenic transcription factor that induces glucose-6-phosphatase and phosphoenylpyruvate carboxykinase 1 genes expression during mice fasting

Publication date: Available online 5 April 2019Source: Biochimica et Biophysica Acta (BBA) - Gene Regulatory MechanismsAuthor(s): Won-Il Choi, Jae-Hyeon Yoon, Ji-Yang Song, Bu-Nam Jeon, Joo-Man Park, Dong-In Koh, Yong-ho Ahn, Kyung-Sup Kim, In-Kyu Lee, Man-Wook HurAbstractGluconeogenesis is essential for blood glucose homeostasis during fasting and is regulated by various enzymes, which are encoded by gluconeogenic genes. Those genes are controlled by various transcription factors. Zinc finger and BTB domain–containing 7c (Zbtb7c, also called Kr-pok) is a BTB-POZ family transcription factor with proto-oncogenic activity. Previous findings have indicated that Zbtb7c is involved in the regulation of fatty acid biosynthesis, suggesting an involvement also in primary metabolism. We found here that fasting induced Zbtb7c expression in the mouse liver and in primary liver hepatocytes. We also observed that Zbtb7c-knockout mice have decreased blood glucose levels, so we investigated whether Zbtb7c plays a role in gluconeogenesis. Indeed, differential gene expression analysis of Zbtb7c-knockout versus wild type mouse livers showed downregulated transcription of gluconeogenic genes encoding the glucose 6-phosphatase catalytic subunit (G6pc) and phosphoenolpyruvate carboxykinase 1 (Pck1), while Zbtb7c expression upregulated these two genes, under fasting conditions. Mechanistically, we found that when complexed with histone deacetylase 3 (Hdac3), Zbtb7c binds insulin response element...
Source: Biochimica et Biophysica Acta (BBA) Gene Regulatory Mechanisms - Category: Genetics & Stem Cells Source Type: research