DOI: 10.1073/pnas.94.24.13209. The maturity-onset diabetes of the young (MODY1) transcription factor HNF4α regulates expression of genes required for glucose transport and metabolism

The maturity-onset diabetes of the young (MODY1) transcription factor HNF4α regulates expression of genes required for glucose transport and metabolism

10.1073/pnas.94.24.13209

Crossref journal-article

Proceedings of the National Academy of Sciences

Proceedings of the National Academy of Sciences (341)

Abstract

Hepatocyte nuclear factor 4α (HNF4α) plays a critical role in regulating the expression of many genes essential for normal functioning of liver, gut, kidney, and pancreatic islets. A nonsense mutation (Q268X) in exon 7 of the HNF4α gene is responsible for an autosomal dominant, early-onset form of non-insulin-dependent diabetes mellitus (maturity-onset diabetes of the young; gene named MODY1 ). Although this mutation is predicted to delete 187 C-terminal amino acids of the HNF4α protein the molecular mechanism by which it causes diabetes is unknown. To address this, we first studied the functional properties of the MODY1 mutant protein. We show that it has lost its transcriptional transactivation activity, fails to dimerize and bind DNA, implying that the MODY1 phenotype is because of a loss of HNF4α function. The effect of loss of function on HNF4α target gene expression was investigated further in embryonic stem cells, which are amenable to genetic manipulation and can be induced to form visceral endoderm. Because the visceral endoderm shares many properties with the liver and pancreatic β-cells, including expression of genes for glucose transport and metabolism, it offers an ideal system to investigate HNF4-dependent gene regulation in glucose homeostasis. By exploiting this system we have identified several genes encoding components of the glucose-dependent insulin secretion pathway whose expression is dependent upon HNF4α. These include glucose transporter 2, and the glycolytic enzymes aldolase B and glyceraldehyde-3-phosphate dehydrogenase, and liver pyruvate kinase. In addition we have found that expression of the fatty acid binding proteins and cellular retinol binding protein also are down-regulated in the absence of HNF4α. These data provide direct evidence that HNF4α is critical for regulating glucose transport and glycolysis and in doing so is crucial for maintaining glucose homeostasis.

Bibliography

Stoffel, M., & Duncan, S. A. (1997). The maturity-onset diabetes of the young (MODY1) transcription factor HNF4Î± regulates expression of genes required for glucose transport andâmetabolism. Proceedings of the National Academy of Sciences, 94(24), 13209â13214.

Authors 2

Markus Stoffel (first)
Stephen A. Duncan (additional)

References 32 Referenced 319

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 10:40 a.m.)
Deposited	3 years, 4 months ago (April 13, 2022, 2:40 p.m.)
Indexed	2 weeks, 1 day ago (Aug. 21, 2025, 1:14 p.m.)
Issued	27 years, 9 months ago (Nov. 25, 1997)
Published	27 years, 9 months ago (Nov. 25, 1997)
Published Online	27 years, 9 months ago (Nov. 25, 1997)
Published Print	27 years, 9 months ago (Nov. 25, 1997)

Funders 0

None

BibTeX

@article{Stoffel_1997, title={The maturity-onset diabetes of the young (MODY1) transcription factor HNF4α regulates expression of genes required for glucose transport and metabolism}, volume={94}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.94.24.13209}, DOI={10.1073/pnas.94.24.13209}, number={24}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Stoffel, Markus and Duncan, Stephen A.}, year={1997}, month=nov, pages={13209–13214} }

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