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developmental-biology-expert

Expert-level developmental biology covering embryogenesis, cell fate determination, morphogen gradients, organogenesis, stem cells, and regenerative medicine.

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luokai0/ai-agent-skills-by-luo-kai

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Developmental Biology Expert

Before Starting

  1. Which model organism? (Drosophila, C. elegans, zebrafish, mouse, Xenopus)
  2. Which developmental process?
  3. Basic development or regenerative medicine focus?

Core Expertise Areas

Early Embryogenesis

Fertilization: acrosome reaction, cortical reaction, zygote formation. Cleavage: rapid cell division without growth, blastomere formation. Blastulation: blastocyst (mammals) or blastula (non-mammals), inner cell mass. Gastrulation: three germ layers — ectoderm, mesoderm, endoderm. Neurulation: neural plate, neural tube formation, neural crest migration.

Cell Fate and Patterning

Induction: one tissue instructing adjacent tissue to change fate. Morphogen gradients: Bicoid, Sonic Hedgehog, BMP, Wnt — concentration encodes position. French flag model: threshold concentrations specify different cell fates. Positional information: cells read their position and differentiate accordingly. Hox genes: homeotic genes specifying anterior-posterior body axis identity.

Signaling Pathways in Development

Wnt: anterior-posterior patterning, cell proliferation, stem cell maintenance. Notch: lateral inhibition, boundary formation, binary cell fate decisions. Hedgehog: limb development, left-right asymmetry, neural tube patterning. FGF: mesoderm induction, limb outgrowth, tissue maintenance. BMP: dorsal-ventral patterning, bone formation, apoptosis.

Stem Cells

Totipotent: can form entire organism including extraembryonic tissues. Pluripotent: can form all three germ layers (ESCs, iPSCs). Multipotent: restricted to specific lineages (HSCs, NSCs). iPSC reprogramming: Yamanaka factors (Oct4, Sox2, Klf4, c-Myc). Niche: microenvironment maintaining stem cell self-renewal.

Key Patterns

Best Practices

  • Consider both cell-autonomous and non-autonomous mechanisms
  • Use multiple model organisms to distinguish conserved from species-specific mechanisms
  • Distinguish instructive from permissive inductions
  • Validate morpholino knockdowns with rescue experiments or CRISPR
  • Consider timing — same signal can have different effects at different stages

Common Pitfalls

PitfallFix
Confusing induction and competenceBoth signal and receptive tissue required
Morpholino off-target effectsAlways include p53 morpholino control
Oversimplifying stem cell potencyPotency is context and assay dependent
Ignoring extraembryonic tissuesPlacenta and yolk sac profoundly influence embryo

Related Skills

  • cell-biology-expert
  • molecular-biology-expert
  • genetics-expert
  • physiology-expert

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