TIP60 acts as a wound-induced factor essential for efficient regeneration in planaria

Area of Science:

• Molecular Biology
• Developmental Biology
• Regenerative Medicine

Background:

• Chromatin modifiers regulate essential cellular processes.
• TIP60 (KAT5) is a key regulator of chromatin dynamics with known roles in stem cells.
• The function of TIP60 in regeneration is largely unknown.

Purpose of the Study:

• To investigate the role of the TIP60 homolog (SMED-TIP60) in planarian regeneration.
• To elucidate the molecular mechanisms underlying TIP60's function in stem cell-driven regeneration.

Main Methods:

• Biochemical analyses of SMED-TIP60 activity.
• RNA interference (RNAi) for functional depletion of Smed-tip60.
• Regeneration assays in planarians (Schmidtea mediterranea).
• In situ hybridization and immunofluorescence for cell analysis.
• Transcriptomic analysis (RNA-seq) of gene expression.

Main Results:

• SMED-TIP60 exhibits histone acetyltransferase and autoacetylation activities.
• Depletion of Smed-tip60 impairs tissue homeostasis, survival, and blastema formation.
• Loss of TIP60 leads to reduced stem cell populations and proliferation.
• TIP60 depletion disrupts wound-response gene expression and positional information resetting.

Conclusions:

• TIP60 is essential for stem cell-mediated regeneration in planarians.
• TIP60 coordinates wound-response gene expression critical for tissue restoration.
• This study identifies TIP60 as a key regulator in the regenerative process.