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The MafA transcription factor appears to be responsible for tissue-specific expression of insulin.


ABSTRACT: Insulin gene expression is regulated by several islet-enriched transcription factors. However, MafA is the only beta cell-specific activator. Here, we show that MafA selectively induces endogenous insulin transcription in non-beta cells. MafA was also first detected in the insulin-producing cells formed during the second and predominant phase of beta cell differentiation, and absent in the few insulin-positive cells found in Nkx6.1(-/-) pancreata, which lack the majority of second-phase beta cells. These results demonstrate that MafA is a potent insulin activator that is likely to function downstream of Nkx6.1 during islet insulin-producing cell development.

SUBMITTER: Matsuoka TA 

PROVIDER: S-EPMC365722 | biostudies-literature | 2004 Mar

REPOSITORIES: biostudies-literature

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The MafA transcription factor appears to be responsible for tissue-specific expression of insulin.

Matsuoka Taka-aki TA   Artner Isabella I   Henderson Eva E   Means Anna A   Sander Maike M   Stein Roland R  

Proceedings of the National Academy of Sciences of the United States of America 20040218 9


Insulin gene expression is regulated by several islet-enriched transcription factors. However, MafA is the only beta cell-specific activator. Here, we show that MafA selectively induces endogenous insulin transcription in non-beta cells. MafA was also first detected in the insulin-producing cells formed during the second and predominant phase of beta cell differentiation, and absent in the few insulin-positive cells found in Nkx6.1(-/-) pancreata, which lack the majority of second-phase beta cel  ...[more]

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