EZH2 Dynamically Associates With Non-coding RNAs in Mouse Hearts After Acute Angiotensin II Treatment

Area of Science:

• Epigenetics and Molecular Biology
• Cardiovascular Research
• Non-coding RNA Biology

Background:

• Enhancer of zeste 2 (EZH2) is key in epigenetic reprogramming during cardiac hypertrophy.
• Non-coding RNAs (ncRNAs) regulate EZH2, but their dynamic interplay during hypertrophic stimulation is unclear.

Purpose of the Study:

• To identify and characterize ncRNAs associated with EZH2 in response to hypertrophic stimuli.
• To understand the dynamic interactions between EZH2 and ncRNAs in the context of Angiotensin II-induced cardiac hypertrophy.

Main Methods:

• Unbiased profiling of EZH2-associated ncRNAs in mouse hearts treated with Angiotensin II (AngII) at various time points.
• Validation of specific long ncRNA (lncRNA) interactions using PCR and RNA pull-down assays.
• RIP-seq analysis to identify EZH2-bound ncRNAs and subsequent clustering based on expression patterns.

Main Results:

• 126 ncRNAs were identified as significantly associated with EZH2, encompassing diverse categories.
• ncRNAs clustered into four groups based on expression changes (enhanced, suppressed) after AngII treatment.
• Direct interaction between EZH2 and Snora33 was confirmed; specific antisense lncRNAs showed distinct binding patterns.

Conclusions:

• This study provides a comprehensive profile of EZH2-associated ncRNAs during cardiac hypertrophy.
• Findings suggest a dynamic regulatory role for ncRNAs in modulating EZH2 function in heart hypertrophy.
• The genomic locus of Malat1 plays a role in regulating EZH2 behavior during hypertrophic stimulation.