YTHDF2 upregulation and subcellular localization dictate CD8 T cell polyfunctionality in anti-tumor immunity

Area of Science:

• Immunology
• Epigenetics
• Molecular Biology

Background:

• RNA methylation, specifically N⁶-methyladenosine (m⁶A), is crucial for immune cell function.
• The role of m⁶A RNA readers in CD8 T cell anti-tumor activity remains largely unexplored.

Purpose of the Study:

• To investigate the function of the m⁶A reader YTHDF2 in CD8 T cell anti-tumor immunity.
• To elucidate the mechanisms by which YTHDF2 influences T cell activity and tumor progression.

Main Methods:

• Analysis of YTHDF2 expression in CD8 T cells.
• Studies on YTHDF2 knockout mouse models and human samples.
• Investigation of YTHDF2's interaction with transcription factors and its role in RNA synthesis and chromatin remodeling.

Main Results:

• YTHDF2 is highly expressed in effector CD8 T cells and facilitates nascent RNA synthesis via m⁶A recognition.
• Loss of YTHDF2 impairs anti-tumor immunity, leading to tumor progression and resistance to PD-1 blockade.
• YTHDF2 promotes T cell polyfunctionality by orchestrating chromatin changes and interacting with IKZF1/3.

Conclusions:

• YTHDF2 is a key regulator of CD8 T cell anti-tumor immunity, coordinating epigenetic and transcriptional programs.
• Targeting YTHDF2 or its interacting partners, like IKZF1/3 with lenalidomide, can restore anti-tumor efficacy in deficient T cells and inform therapeutic strategies.