The mammalian germline as a pluripotency cycle

Area of Science:

• Developmental biology
• Stem cell biology
• Epigenetics

Background:

• Naive pluripotency enables early embryonic cells to form all cell types.
• Germ cells are conventionally considered unipotent but can regain pluripotency.
• Primordial germ cells express pluripotency-associated transcription factors.

Purpose of the Study:

• To investigate the hypothesis that germ cells require pluripotency factors for epigenetic control.
• To explore the latent pluripotency potential within germ cells.
• To propose a continuous cycle of pluripotency sustained by shared transcription factors.

Main Methods:

• Literature review and hypothesis formulation.
• Analysis of existing data on germ cell gene expression.
• Comparative analysis of transcription factor networks in pluripotent and germ cells.

Main Results:

• Germ cells express key pluripotency transcription factors.
• These factors appear crucial for maintaining a de-restricted epigenome in germ cells.
• Germ cells exhibit latent potential, as seen in teratocarcinogenesis and in vitro conversion.

Conclusions:

• A continuous cycle of pluripotency exists, encompassing naive epiblast and latent germline states.
• Shared transcription factor networks sustain this unbroken pluripotency cycle.
• Germ cells possess a latent pluripotency that is regulated by specific transcription factors.