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Related Experiment Videos

Tracking an embryonic L1 retrotransposition event.

Eline T Luning Prak1, Allen W Dodson, Evan A Farkash

  • 1Department of Pathology and Laboratory Medicine, University of Pennsylvania, 405B Stellar Chance Laboratories, 422 Curie Boulevard, Philadelphia, PA 19104, USA. luning@mail.med.upenn.edu

Proceedings of the National Academy of Sciences of the United States of America
|February 6, 2003
PubMed
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Active human Long interspersed nuclear elements 1 (L1) retrotransposons were tagged with EGFP and shown to retrotranspose in vivo. This study demonstrates early-stage L1 retrotransposition in a transgenic mouse model, producing fluorescence in the testis.

Area of Science:

  • Molecular Biology
  • Genetics
  • Genomics

Background:

  • Long interspersed nuclear elements 1 (L1) are active retrotransposons found in many species.
  • L1 elements replicate through an RNA intermediate, undergoing reverse transcription and insertion into new genomic locations.

Purpose of the Study:

  • To tag an active human L1 element (L1(RP)) with enhanced green fluorescent protein (EGFP).
  • To investigate the in vivo retrotransposition of L1-EGFP in a transgenic mouse model.
  • To characterize the timing of L1 retrotransposition during early embryonic development.

Main Methods:

  • An active human L1 element (L1(RP)) was engineered to express EGFP.
  • L1-EGFP was introduced into a mouse model to create transgenic founder mice.
  • Fluorescence (GFP expression) was used to track successful L1 retrotransposition events.

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Main Results:

  • L1-EGFP successfully underwent retrotransposition in vivo within the transgenic mouse.
  • Fluorescence was detected in the testis of the L1-EGFP transgenic founder mouse.
  • Retrotransposition occurred at a very early developmental stage in the founder mouse.

Conclusions:

  • The engineered L1-EGFP construct is capable of active retrotransposition in a mammalian system.
  • This study provides evidence of early-stage L1 retrotransposition during mouse development.
  • The L1-EGFP transgenic model offers a valuable tool for studying L1 retrotransposition dynamics.