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LEAP: L1 Element Amplification Protocol.

Huira C Kopera1, Diane A Flasch2, Mitsuhiro Nakamura2

  • 1Department of Human Genetics, University of Michigan Medical School, 1241 E. Catherine Street, Ann Arbor, MI, 48109, USA. chongh@umich.edu.

Methods in Molecular Biology (Clifton, N.J.)
|February 20, 2016
PubMed
Summary
This summary is machine-generated.

The LEAP assay measures Long INterspersed Element-1 (LINE-1) retrotransposon activity by assessing L1 ORF2p

Keywords:
L1 element amplification protocol (LEAP)LINE-1Reverse transcriptase (RT)Ribonucleoprotein particle (RNP)

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Long INterspersed Element-1 (LINE-1 or L1) retrotransposons are mobile genetic elements in the human genome.
  • LINE-1 elements encode ORF1p and ORF2p proteins essential for their retrotransposition.
  • Understanding LINE-1's molecular mechanisms is crucial for studying its role in genome evolution and disease.

Purpose of the Study:

  • To describe and validate the L1 element amplification protocol (LEAP) assay.
  • To demonstrate the utility of LEAP in studying LINE-1 reverse transcriptase (RT) activity.
  • To investigate the impact of mutations on L1 ORF2p RT function.

Main Methods:

  • Isolation of LINE-1 ribonucleoprotein particle (RNP) complexes from transfected human cells.
  • In vitro assay of L1 ORF2p reverse transcription using an engineered oligonucleotide primer and L1 RNA template.
  • Amplification and sequencing of synthesized LINE-1 cDNA via PCR for product verification.

Main Results:

  • The LEAP assay successfully quantifies L1 ORF2p reverse transcriptase activity.
  • LEAP has been used to determine the effects of mutations in L1 ORF1p and ORF2p on RT activity.
  • The assay revealed that L1 ORF2p RT can extend primers with 3' terminal mismatches.

Conclusions:

  • The LEAP assay is a valuable biochemical tool for dissecting LINE-1 retrotransposition mechanisms.
  • LEAP, combined with other assays, is essential for understanding LINE-1 regulation by cellular proteins.
  • This method aids in characterizing the enzymatic properties of L1 ORF2p reverse transcriptase.