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Related Experiment Videos

TEL is a sequence-specific transcriptional repressor.

R G Lopez1, C Carron, C Oury

  • 1CNRS UMR146, Institut Curie, Centre Universitaire, 91405 Orsay, France.

The Journal of Biological Chemistry
|October 9, 1999
PubMed
Summary
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The TEL gene, implicated in leukemia, acts as a transcriptional repressor. Its ability to self-associate via its oligomerization domain is crucial for this repressive function and its role in oncogenesis.

Area of Science:

  • Molecular Biology
  • Cancer Genetics
  • Transcriptional Regulation

Background:

  • The TEL gene, encoding an ETS family transcriptional regulator, is frequently involved in chromosomal translocations in human leukemia and sarcoma.
  • TEL possesses an unusual ability among ETS proteins to self-associate in vivo, a property critical for the oncogenic activation of TEL-derived fusion proteins.

Purpose of the Study:

  • To investigate the functional role of TEL's self-association in transcriptional regulation.
  • To identify the domains within TEL responsible for its repressor activity.

Main Methods:

  • Assessed TEL's transcriptional repressor activity on ETS-binding site-driven promoters.
  • Utilized deletion and substitution mutagenesis of TEL's oligomerization domain.
  • Employed fusions of TEL to the heterologous DNA-binding domain of Gal4 to map repression domains.

Related Experiment Videos

Main Results:

  • TEL functions as a sequence-specific transcriptional repressor.
  • The oligomerization domain of TEL is essential for its repressor activity, as demonstrated by impaired repression upon deletion or substitution.
  • Substitution of TEL's oligomerization domain with unrelated domains retained repressor activity, confirming self-association as key.
  • Two autonomous repression domains, separate from the oligomerization domain, were identified in TEL.

Conclusions:

  • TEL's ability to repress ETS-binding site transcription is dependent on its capacity for self-association.
  • The identified repression domains are critical for TEL's function.
  • These findings provide insights into TEL's normal biological function, its relationship with other ETS proteins, and its contribution to leukemogenesis.