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Promoter for the human ferritin heavy chain-encoding gene (FERH): structural and functional characterization
M A Bevilacqua1, M Giordano, P D'Agostino
1Dipartimento di Biochimica e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Italy.
Gene
|February 15, 1992
Summary
This study analyzed the human ferritin heavy chain gene promoter (pFERH) in liver and cervical cancer cells. Key transcription factor Sp1 and another low-affinity factor drive pFERH activity, crucial for ferritin gene regulation.
Area of Science:
- Molecular Biology
- Gene Regulation
- Cell Biology
Background:
- Ferritin is essential for iron storage and homeostasis.
- The human ferritin heavy chain gene (FERH) promoter (pFERH) regulates ferritin expression.
- Understanding pFERH function is key to cellular iron metabolism.
Purpose of the Study:
- To functionally analyze the promoter of the human ferritin heavy chain-encoding gene (pFERH).
- To identify key regulatory elements within pFERH responsible for its transcriptional activity.
- To compare pFERH activity in different cell types.
Main Methods:
- Functional analysis of pFERH using 5'-deletion mutants.
- Gene transfection in HepG2 and HeLa cells.
- Identification of transcription factor binding motifs.
Main Results:
- pFERH exhibits equivalent activity in HepG2 and HeLa cells, despite differing ferritin isotypes.
- pFERH activity is dependent on two distinct regulatory motifs.
- One motif, recognized by Sp1, accounts for approximately 50% of transcriptional activity.
- A second, low-affinity factor also contributes to pFERH regulation.
Conclusions:
- The human ferritin heavy chain gene promoter (pFERH) is regulated by at least two distinct DNA-binding factors.
- The transcription factor Sp1 plays a significant role in driving pFERH activity.
- These findings provide insights into the molecular mechanisms controlling ferritin gene expression.