Reprogramming competence of OCT factors is determined by transactivation domains

Area of Science:

• Stem cell biology
• Molecular biology
• Epigenetics

Background:

• Octamer-binding transcription factor 4 (OCT4) is crucial for inducing pluripotency.
• Other OCT factors share structural similarities with OCT4 but lack reprogramming capabilities.

Purpose of the Study:

• To investigate the reprogramming potential of OCT6 in human cells.
• To delineate the structural components responsible for OCT factor reprogramming competence.

Main Methods:

• Creation of reciprocal domain-swapped chimeras and mutants of OCT factors.
• Comparative analysis of OCT4- and OCT6-based reprogramming.
• Assessment of mesenchymal-epithelial transition and pluripotency network activation.

Main Results:

• OCT6 elicits reprogramming specifically in human cells.
• OCT6-based reprogramming does not alter mesenchymal-epithelial transition but shows delayed pluripotency network activation compared to OCT4.
• Essential elements for OCT4/OCT6-dependent reprogramming were identified.
• Features preventing pluripotency induction by other OCT factors were elucidated.
• Chimeric proteins superior to OCT4 in reprogramming were discovered.

Conclusions:

• Structural components of OCT factors determine their reprogramming competence.
• OCT6 represents a novel factor for human cell reprogramming.
• This study provides a framework for understanding OCT factor-mediated pluripotency induction.