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#lineage commitment

3 public questions tagged with this topic.

Stem Cell -l

What is the correct sequence of lineage commitment in hematopoietic differentiation?

Developmental potency narrows progressively as epigenetic restrictions and lineage-specific transcription factors accumulate. The zygote and early morula are totipotent, producing embryo plus placenta. With blastocyst formation, inner cell mass becomes pluripotent, forming all three germ layers ectoderm, mesoderm, endoderm but not trophectoderm. Subsequently, tissue-specific multipotent stem cells such as hematopoietic stem cells arise, limited to lineages within one germ layer. Finally, unipotent progenitors differentiate into single cell types like erythrocytes or spermatids. This totipotent to pluripotent to multipotent to unipotent hierarchy reflects irreversible chromatin condensation and loss of plasticity.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 6: Hierarchy of potency restriction.

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Stem Cell -ll

What is the correct order of lineage commitment in hematopoietic differentiation?

Early embryonic hierarchy commences from totipotent zygote capable of forming whole organism including extraembryonic placenta and yolk sac membranes required for implantation. First lineage decision segregates trophectoderm outer epithelium, leaving inner cell mass as pluripotent source of epiblast which later forms three germ layers ectoderm, mesoderm, endoderm through gastrulation. Progressively, definitive hematopoietic stem cells arising in aorta-gonad-mesonephros region become multipotent blood-restricted, while subsequent progenitors such as common myeloid progenitor and later megakaryocyte-erythroid progenitors become increasingly unipotent. This sequential restriction mirrors epigenetic silencing of potency genes.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 6: Totipotent to Unipotent lineage commitment stepwise restriction.

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Stem Cell -lll

What is the correct order of lineage commitment in hematopoietic differentiation?

Developmental potency narrows progressively through epigenetic restriction and lineage priming. Zygote and early blastomeres up to two to four cell stage are totipotent, able to produce embryonic plus extraembryonic placenta and yolk sac membranes. Inner cell mass subsequently restricts to pluripotent state, generating ectoderm, mesoderm, endoderm but not trophoblast under normal conditions. Subsequently hematopoietic stem cells become multipotent within blood lineages only, and committed progenitors become unipotent forming one mature type such as erythrocyte or spermatogonium. This hierarchy underlies stepwise differentiation trajectories and transplantation potential.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 2: Potency hierarchy Totipotent to Unipotent progressive restriction.

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