Functional specialization of MITF, TFEB and TFE3 drives radically distinct adaptive gene expression programs in...

Area of Science:

• Cellular biology
• Molecular oncology
• Gene regulation

Background:

• Multiple transcription factors can target the same DNA sequences, leading to complex regulatory outcomes.
• The distinct biological functions of co-targeting transcription factors remain largely uncharacterized.
• In melanoma, MITF, TFEB, and TFE3 are co-expressed and regulate key cellular processes.

Purpose of the Study:

• To elucidate the functional specialization of MITF, TFEB, and TFE3 in melanoma.
• To understand the impact of these co-targeting transcription factors on cancer progression.
• To investigate how these factors coordinate gene expression programs under varying cellular conditions.

Main Methods:

• Analysis of gene expression programs regulated by MITF, TFEB, and TFE3.
• Investigation of transcription factor binding to shared DNA sequences.
• Assessment of the role of these factors in response to microenvironmental cues like glucose limitation.

Main Results:

• MITF, TFEB, and TFE3, despite binding similar sequences, regulate distinct and often opposing gene expression programs.
• These factors coordinate cellular differentiation, metabolic reprogramming, protein synthesis, and immune modulator expression.
• A hierarchical cascade is revealed where environmental stresses trigger these factors to drive specific transcriptional programs.

Conclusions:

• Functional specialization of MITF, TFEB, and TFE3 is critical for coordinating diverse cellular processes in melanoma.
• These transcription factors play key roles in mediating phenotypic transitions in cancer.
• Understanding these distinct roles provides insights into melanoma progression and potential therapeutic strategies.