Standard name LE_EGR2_TARGETS_UP
Systematic name M12804
Brief description Genes up-regulated in P14 nerves of transgenic mice having hypomorhic (reduced function) allele of EGR2 [GeneID=1959].
Full description or abstract Egr2 is a transcription factor required for peripheral nerve myelination in rodents, and mutations in Egr2 are associated with congenital hypomyelinating neuropathy (CHN) in humans. To further study its role in myelination, we generated mice harboring a hypomorphic Egr2 allele (Egr2Lo) that survive for up to 3 weeks postnatally, a period of active myelination in rodents. These Egr2Lo/Lo mice provided the opportunity to study the molecular effects of Egr2 deficiency on Schwann cell biology, an analysis that was not possible previously, because of the perinatal lethality of Egr2-null mice. Egr2Lo/Lo mice phenocopy CHN, as evidenced by the severe hypomyelination and increased numbers of proliferating Schwann cells of the peripheral nerves. Comparison of sciatic nerve gene expression profiles during development and after crush injury with those of Egr2Lo/Lo Schwann cells revealed that they are developmentally arrested, with down-regulation of myelination-related genes and up-regulation of genes associated with immature and promyelinating Schwann cells. One of the abnormally elevated genes in Egr2Lo/Lo Schwann cells, Sox2, encodes a transcription factor that is crucial for maintenance of neural stem cell pluripotency. Wild-type Schwann cells infected with Sox2 adenovirus or lentivirus inhibited expression of myelination-associated genes (e.g., myelin protein zero; Mpz), and failed to myelinate axons in vitro, but had an enhanced proliferative response to beta-neuregulin. The characterization of a mouse model of CHN has provided insight into Schwann cell differentiation and allowed the identification of Sox2 as a negative regulator of myelination.
Collection C2: curated gene sets
      CGP: chemical and genetic perturbations
Source publication Pubmed 15695336   Authors: Le N,Nagarajan R,Wang JY,Araki T,Schmidt RE,Milbrandt J
Exact source Table 2S: INC ALL
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(show 24 gene sets from the same authors)
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Organism Mus musculus
Contributed by Kate Stafford (MSigDB Team)
Source platform AFFY_MG_U74
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Version history 3.0: Renamed from LE_MYELIN_UP

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