We have updated our privacy policy. If you have any question, contact us at privacy@scicrunch.org. Dismiss and don't show again

Searching across hundreds of databases

Our searching services are busy right now. Your search will reload in five seconds.

Forgot Password

If you have forgotten your password you can enter your email here and get a temporary password sent to your email.

Analysis of congenital hypomyelinating Egr2Lo/Lo nerves identifies Sox2 as an inhibitor of Schwann cell differentiation and myelination.

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.

Pubmed ID: 15695336 RIS Download

Mesh terms: Animals | Cell Differentiation | DNA-Binding Proteins | Demyelinating Diseases | ERG1 Potassium Channel | Ether-A-Go-Go Potassium Channels | Gene Expression Profiling | HMGB Proteins | Mice | Mice, Neurologic Mutants | Myelin Sheath | Nuclear Proteins | Peripheral Nerves | Pluripotent Stem Cells | Potassium Channels, Voltage-Gated | SOXB1 Transcription Factors | Schwann Cells | Transcription Factors

Research resources used in this publication

None found

Research tools detected in this publication

None found

Data used in this publication

None found

Associated grants

  • Agency: NIA NIH HHS, Id: R01 AG10299
  • Agency: NINDS NIH HHS, Id: NS4074
  • Agency: NIDDK NIH HHS, Id: R37 DK19645
  • Agency: NIDDK NIH HHS, Id: R37 DK019645
  • Agency: NIA NIH HHS, Id: R01 AG010299

Mouse Genome Informatics (Data, Gene Annotation)

Publication data is provided by the National Library of Medicine ® and PubMed ®. Data is retrieved from PubMed ® on a weekly schedule. For terms and conditions see the National Library of Medicine Terms and Conditions.

We have not found any resources mentioned in this publication.