* ARX regulates cortical intermediate progenitor cell expansion and upper layer neuron formation through repression of Cdkn1c.
- Mutations in the Aristaless-related homeobox (ARX) gene are found in a spectrum of epilepsy and X-linked intellectual disability disorders. During development Arx is expressed in pallial ventricular zone (VZ) progenitor cells where the excitatory projection neurons of the cortex are born. Arx(-/Y) mice were shown to have decreased proliferation in the cortical VZ resulting in smaller brains; however, the basis for this reduced proliferation was not established. To determine the role of ARX on cell cycle dynamics in cortical progenitor cells, we generated cerebral cortex-specific Arx mouse mutants (cKO). The loss of pallial Arx resulted in the reduction of cortical progenitor cells, particularly the proliferation of intermediate progenitor cells (IPCs) was affected. Later in development and postnatally cKO brains showed a reduction of upper layer but not deeper layer neurons consistent with the IPC defect. Transcriptional profile analysis of E14.5 Arx-ablated cortices compared with control revealed that CDKN1C, an inhibitor of cell cycle progression, is overexpressed in the cortical VZ and SVZ of Arx KOs throughout corticogenesis. We also identified ARX as a direct regulator of Cdkn1c transcription. Together these data support a model where ARX regulates the expansion of cortical progenitor cells through repression of Cdkn1c.
=>特有の, 特効薬, 明確な, 特定の, 種の, はっきりした
Overview of noun specific
The noun specific has 2 senses (no senses from tagged texts)
1. particular, specific -- (a fact about some part (as opposed to general); "he always reasons from
the particular to the general")
2. specific -- (a medicine that has a mitigating effect on a specific disease; "quinine is a
specific for malaria")
Overview of adj specific
The adj specific has 4 senses (first 2 from tagged texts)
1. (39) specific -- ((sometimes followed by `to') applying to or characterized by or distinguishing
something particular or special or unique; "rules with specific application"; "demands specific to
the job"; "a specific and detailed account of the accident")
2. (5) specific -- (stated explicitly or in detail; "needed a specific amount")
3. specific -- (relating to or distinguishing or constituting a taxonomic species; "specific
characters")
4. specific -- (being or affecting a disease produced by a particular microorganism or condition;
used also of stains or dyes used in making microscope slides; "quinine is highly specific for
malaria"; "a specific remedy"; "a specific stain is one having a specific affinity for particular
structural elements")
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