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#stem cell properties

3 public questions tagged with this topic.

Stem Cell -l

Which of the following is NOT an essential property of a stem cell?

Essential stem cell properties include prolonged self-renewal, maintenance of an undifferentiated state with open chromatin, and capacity to differentiate into specialized functional cells under niche cues. Self-renewal involves asymmetric or symmetric divisions preserving stem pool while generating progeny. Limited division potential characterizes transit-amplifying progenitors and differentiated somatic cells subject to Hayflick limit and telomere attrition. True stem cells divide extensively throughout life, expressing telomerase and checkpoint evasion mechanisms. Recognizing unlimited self-renewal versus limited progenitor amplification separates stemness from more restricted proliferative populations during tissue homeostasis.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 6: Properties of stem versus progenitors.

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Stem Cell -ll

Which of the following is NOT a property of stem cells?

Canonical stem cell properties include prolonged self-renewal through cell cycle regulators such as telomerase, Bmi1 Polycomb protein, and p27 control, capacity to differentiate into multiple mature types under niche instructions, and dependence on niche signals for maintenance of undifferentiated state. Transit-amplifying and terminal differentiation pathways ensure progeny exit cell cycle and perform specialized functions such as absorption or contraction. If a cell terminally differentiated upon each division, it would lose self-renewal and rapidly exhaust the pool, contradicting lifelong regeneration observed in intestine, skin, and blood where stem cells persist for decades continuously producing progeny.

Ref: Watt & Hogan, Science 2000; Gilbert, Chapter 6: Stem cell properties self-renewal versus terminal differentiation.

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Stem Cell -lll

A key characteristic distinguishing stem cells from progenitor cells is:

Stem cells exhibit long-term self-renewal enabling indefinite expansion while retaining potency to generate differentiated progeny through asymmetric or symmetric divisions throughout organismal lifespan. Progenitor or transit-amplifying cells show limited replicative lifespan, gradually exhaust after several divisions, and possess restricted lineage potential with lower telomerase activity. While both can proliferate and differentiate, only stem cells reconstitute entire tissue over organism lifetime and rescue ablated tissue upon transplantation assays. This distinction is demonstrated in hematopoietic reconstitution and epidermal lineage tracing, underpinning regenerative medicine strategies and therapeutic targeting.

Ref: Morrison et al., Annu Rev Cell Dev Biol 1997; Gilbert, Chapter 6: Self-renewal hallmark distinguishes stem from progenitor.

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