Nervous System Regionalization Entails Axial Allocation before Neural Differentiation.

Nervous System Regionalization Entails Axial Allocation before Neural Differentiation.
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DOI:
10.1016/j.cell.2018.09.040
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发表时间:
2018-11-01
期刊:
影响因子:
64.5
通讯作者:
Briscoe J
Briscoe J
中科院分区:
生物学1区
文献类型:
--
作者:
Metzis V;Steinhauser S;Pakanavicius E;Gouti M;Stamataki D;Ivanovitch K;Watson T;Rayon T;Mousavy Gharavy SN;Lovell-Badge R;Luscombe NM;Briscoe J

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Neural induction in vertebrates generates a CNS that extends the rostral-caudal length of the body. The prevailing view is that neural cells are initially induced with anterior (forebrain) identity; caudalizing signals then convert a proportion to posterior fates (spinal cord). To test this model, we used chromatin accessibility to define how cells adopt region-specific neural fates. Together with genetic and biochemical perturbations, this identified a developmental time window in which genome-wide chromatin-remodeling events preconfigure epiblast cells for neural induction. Contrary to the established model, this revealed that cells commit to a regional identity before acquiring neural identity. This “primary regionalization” allocates cells to anterior or posterior regions of the nervous system, explaining how cranial and spinal neurons are generated at appropriate axial positions. These findings prompt a revision to models of neural induction and support the proposed dual evolutionary origin of the vertebrate CNS. Chromatin accessibility defines neural progenitor identity A limited developmental window exists to establish spinal cord competency Cells acquire axial identity prior to neural identity Regional identity precedes neural identity of the anterior and posterior nervous systems.
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