HSF1 functions as a transcription regulator for Dp71 expression.

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Heat shock factor 1 (HSF1) is a key transcriptional regulator involved in cellular stress responses.
• Dystrophin Dp71 is a widely expressed isoform of the dystrophin gene family, crucial for muscle structure and function.

Purpose of the Study:

• To investigate the role of HSF1 as a transcriptional factor for endogenous Dystrophin Dp71 expression.
• To elucidate the mechanism by which HSF1 regulates Dp71.

Main Methods:

• Utilized HSF1-knockout mice and wild-type controls.
• Employed cell culture experiments with HSF1 overexpression and inhibition in HeLa cells.
• Applied electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation (ChIP), and luciferase reporter assays.

Main Results:

• HSF1 knockout mice exhibited significantly reduced Dp71 mRNA and protein levels in multiple organs (brain, lung, liver, spleen, kidney).
• HSF1 overexpression enhanced Dp71 expression in HeLa cells, while HSF1 inhibition decreased it.
• HSF1 was shown to directly bind to the Heat Shock Element (HSE) in the Dp71 promoter region.

Conclusions:

• HSF1 acts as a direct transcriptional regulator of Dystrophin Dp71 expression.
• This finding reveals a novel regulatory pathway for Dp71, linking heat shock response mechanisms to dystrophin gene regulation.