The Transcription Factor NF-κB in Stem Cells and Development

Area of Science:

• Evolutionary developmental biology (evo-devo)
• Molecular biology
• Stem cell biology

Background:

• Nuclear factor kappa B (NF-κB) is a transcription factor family regulating immunity, cancer, and memory.
• Emerging research highlights NF-κB's role in stem cell development and evolutionary biology.
• NF-κB family proteins, containing REL domains, are evolutionarily conserved.

Purpose of the Study:

• To review the role of NF-κB in development across species (Drosophila, Xenopus, mice, humans) through an evo-devo lens.
• To summarize cellular phenotypes associated with genetic NF-κB defects.
• To explore NF-κB's function in embryonic and adult stem cell differentiation.

Main Methods:

• Literature review focusing on NF-κB's role in development.
• Comparative analysis of NF-κB conservation and function across species.
• Summary of cellular phenotypes from genetic NF-κB defects.

Main Results:

• NF-κB proteins are evolutionarily conserved, with REL domain-containing proteins found across diverse species.
• Genetic NF-κB defects lead to cellular phenotypes like impaired B- and T-cell development.
• Embryonic stem cells lack NF-κB, potentially due to miRNA inhibition, but its repression hinders mesodermal and neuroectodermal differentiation.
• NF-κB regulates adult stem cell differentiation, with c-REL crucial for neuronal differentiation and RELA for osteogenic/mesodermal differentiation.

Conclusions:

• NF-κB is a critical regulator of developmental processes and stem cell differentiation, conserved across species.
• Specific NF-κB family members (c-REL, RELA) have distinct roles in neuronal and mesodermal differentiation.
• Understanding NF-κB's role in stem cells offers insights into developmental biology and potential therapeutic strategies.