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Biochemical Approaches to Study LINE-1 Reverse Transcriptase Activity In Vitro.

Sébastien Viollet1,2,3, Aurélien J Doucet1,2,3, Gaël Cristofari4,5,6

  • 1INSERM, U1081, Institute for Research on Cancer and Aging of Nice (IRCAN), Nice, 06100, France.

Methods in Molecular Biology (Clifton, N.J.)
|February 20, 2016
PubMed
Summary

New in vitro assays detect LINE-1 ORF2p reverse transcriptase activity in cellular fractions. These methods, LEAP and DLEA, aid in studying retrotransposon function and presence.

Keywords:
In vitro assayL1LINE-1Non-LTR retrotransposonORF2pRNA-dependent DNA-polymeraseRetroelementReverse transcriptaseRibonucleoprotein particle

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • LINE-1 (L1) retrotransposons are mobile genetic elements crucial for genome evolution.
  • ORF2p is the essential protein product of L1, possessing reverse transcriptase activity.
  • Monitoring ORF2p activity in cellular fractions is vital for understanding L1 retrotransposition.

Purpose of the Study:

  • To develop and describe in vitro assays for detecting LINE-1 ORF2p reverse transcriptase activity.
  • To provide methods for isolating L1 ribonucleoprotein particles and identifying ORF2p activity.
  • To compare two distinct assay methodologies for their utility and benefits.

Main Methods:

  • Expression and isolation of L1 ribonucleoprotein particles.
  • L1 element amplification protocol (LEAP): primer extension with dNTPs followed by PCR.
  • Direct L1 extension assay (DLEA): primer extension with radiolabeled dTMPs and detection via dot-blot or gel electrophoresis.

Main Results:

  • Successful development of two independent in vitro assays (LEAP and DLEA) to measure ORF2p reverse transcriptase activity.
  • Demonstration of methods for isolating L1 ribonucleoprotein particles.
  • Identification of ORF2p activity within cellular fractions using the developed assays.

Conclusions:

  • LEAP and DLEA provide robust methods for studying LINE-1 ORF2p activity.
  • These assays facilitate research into the role of L1 retrotransposons in cellular processes.
  • The described methods offer valuable tools for analyzing retrotransposon presence and function.