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Analysis of LINE-1 Retrotransposition at the Single Nucleus Level
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Long Interspersed Nuclear Elements 1 (LINE1): The chimeric transcript L1-MET and its involvement in cancer.

Andrea Cervantes-Ayalc1, Ruth Ruiz Esparza-Garrido2, Miguel Ángel Velázquez-Flores3

  • 1Laboratorio de RNAs no codificantes, Unidad de Investigación Médica en Genética Humana del Hospital de Pediatría "Silvestre Frenk Freund", Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social (IMSS), CDMX 06720, México.

Cancer Genetics
|January 10, 2020
PubMed
Summary

Long interspersed nuclear elements 1 (LINE1) retrotransposons can cause genomic instability. Altered LINE1 regulation, particularly antisense promoter hypomethylation in cancer, increases L1-MET expression, potentially forming chimeric proteins.

Keywords:
CancerChimeric genesGenomic instabilityLINE1Retrotransposition

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cancer Research

Background:

  • Long interspersed nuclear elements 1 (LINE1) are retrotransposons driving human genome evolution.
  • LINE1 mobility can lead to genomic instability and chimeric gene formation.
  • Cellular mechanisms regulate LINE1 retrotransposition, but dysregulation is linked to genomic alterations.

Purpose of the Study:

  • To investigate the biological impact of LINE1 insertions into human genes.
  • To explore the role of LINE1 antisense promoter (ASP) hypomethylation in cancer.
  • To understand the implications of increased L1-MET expression in cancer development.

Main Methods:

  • Analysis of LINE1 genomic insertions in human genes.
  • Investigation of ASP methylation status across various cancer types.
  • Assessment of L1-MET expression levels and correlation with MET protein in cancer.

Main Results:

  • LINE1 elements are inserted into 988 human genes, influencing their transcription via LINE1's antisense promoter (ASP).
  • ASP hypomethylation is observed in all cancer types studied, correlating with elevated L1-MET expression.
  • Increased L1-MET expression in certain cancers affects both low and high MET protein levels.

Conclusions:

  • LINE1 insertions and their regulatory elements, like the ASP, play a significant role in human gene regulation and genomic instability.
  • Dysregulation of LINE1, specifically ASP hypomethylation, is a common feature in cancer, leading to altered gene expression.
  • The precise nature of the L1-MET protein product and its oncogenic role requires further investigation.