Avian pluripotent stem cells

Area of Science:

• Stem cell biology
• Developmental biology
• Avian research

Background:

• Pluripotent stem cells are undifferentiated cells with self-renewal and differentiation capabilities.
• Embryonic stem cells (ESCs) and embryonic germ cells (EGCs) are key tools for studying early development and genetic manipulation.
• Avian pluripotent stem cells offer a model for understanding embryonic differentiation and germ line development.

Purpose of the Study:

• To review the derivation and potential applications of avian pluripotent stem cells.
• To highlight the capacity of chicken ESCs and EGCs for differentiation and chimera formation.
• To identify challenges and future directions for utilizing these cells in research, including transgenic chicken generation.

Main Methods:

• Derivation of pluripotent stem cells from stage X blastoderms and PGCs.
• In vitro differentiation assays (embryoid bodies).
• In vivo studies involving grafting and injection into early embryos to assess chimera formation.

Main Results:

• Blastoderm-derived ESCs differentiate into derivatives of all three germ layers in vitro and form various cell types in vivo.
• ESCs can contribute to somatic tissues and the germ line when injected into stage X blastoderms, forming chimeras.
• PGC-derived EGCs show differentiation potential and contribute to somatic lineages, with germ line chimeras reported under specific conditions.
• Transgenic chicken lines have not yet been generated using these stem cell types.

Conclusions:

• Significant progress has been made in culturing avian pluripotent stem cells.
• The potential for generating somatic and germ line chimeras depends on culture conditions and cell passage.
• Future research focusing on germ line segregation and pluripotency mechanisms will enable the full utilization of avian pluripotent stem cells.