High levels of Id1 expression define B1 type adult neural stem cells.
High levels of Id1 expression define B1 type adult neural stem cells.
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DOI:
10.1016/j.stem.2009.08.017
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发表时间:
2009-11-06
期刊:
影响因子:
23.9
通讯作者:
Benezra R
中科院分区:
文献类型:
--
作者:
Nam HS;Benezra R
Defining the molecular identity of stem cells may be critical for formulating a rational strategy for the therapeutic intervention of stem cell dysfunction. We find that high expression of Id1, a dominant-negative helix-loop-helix transcriptional regulator, identifies a rare population GFAP+ astrocytes with stem cell attributes among the subventricular astrocytes in the adult brain. The rare, long-lived, and relatively quiescent Id1high astrocytes with morphology characteristic of B1 type astrocytes self-renew and generate migratory neuroblasts that differentiate into olfactory bulb interneurons. Cultured Id1high neural stem cells can self-renew asymmetrically and generate a stem and a differentiated cell expressing progressively lower levels of Id1, revealing an Id1 gradient in unperturbed cells of subventricular neurogenic lineages. Moreover, Id genes are necessary to confer self-renewal capacity, a characteristic of stem cell identity. We suggest that high expression of a single transcriptional regulator, Id1, molecularly defines the long-sought-after B1 type adult neural stem cells.
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