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The dosage of Patz1 modulates reprogramming process.

Hui Ma¹, Jin Rong Ow¹, Bobby Cheng Peow Tan²

¹Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, MD6, Centre for Translational Medicine, Level 14, South Core, 14 Medical Drive Singapore 117597.

Scientific Reports

|December 18, 2014

Summary

The dosage of Patz1 influences induced pluripotent stem cell (iPSC) reprogramming. Heterozygous Patz1 knockout enhances reprogramming by opening chromatin and bypassing senescence, while complete knockout hinders it.

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Area of Science:

Cell Biology
Epigenetics
Stem Cell Research

Background:

Cellular reprogramming to induced pluripotent stem cells (iPSCs) involves Oct4, Klf4, Sox2, and c-Myc (OKSM) factors.
Patz1 is known to maintain embryonic stem cell (ESC) identity.
Genetic and epigenetic factors critically regulate reprogramming efficiency.

Purpose of the Study:

To investigate the role of Patz1 dosage in OKSM-induced reprogramming.
To determine how Patz1 affects cellular senescence and chromatin structure during reprogramming.

Main Methods:

Overexpression of OKSM transcription factors in mouse embryonic fibroblasts (MEFs).
Comparison of reprogramming efficiency in wild-type, Patz1(+/-), and Patz1(-/-) MEFs.
Analysis of senescence markers (Ink4a/Arf locus) and chromatin modifications (histone acetylation and methylation).

Main Results:

Patz1 heterozygous knockout (Patz1(+/-)) MEFs showed enhanced iPSC colony formation compared to wild-type.
Patz1(+/-) MEFs bypassed senescence and displayed an open chromatin structure with increased histone acetylation and H3K4 methylation.
Patz1 knockout (Patz1(-/-)) MEFs exhibited the lowest reprogramming efficiency, potentially due to senescence induction.

Conclusions:

Patz1 dosage critically modulates iPSC reprogramming efficiency.
Patz1 influences reprogramming by affecting cell senescence, proliferation, and chromatin accessibility.
Targeting Patz1 dosage may offer a strategy to optimize cellular reprogramming.