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Related Experiment Video

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Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
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Evolutionally dynamic L1 regulation in embryonic stem cells.

Nathaly Castro-Diaz1, Gabriela Ecco1, Andrea Coluccio1

  • 1School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

Genes & Development
|June 19, 2014
PubMed
Summary
This summary is machine-generated.

Host restriction factors, like KAP1 (KRAB-associated protein 1), repress ancient Long interspersed element-1 (L1) lineages in human embryonic stem cells. Newer L1 elements are regulated by DNA methylation and PIWI-piRNA pathways.

Keywords:
DNA methylationKAP1KRAB-ZFPsLINE1embryonic stem cellsevolution

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Mobile elements, particularly Long interspersed element-1 (L1), are significant evolutionary forces impacting genomic integrity.
  • L1 elements exhibit dynamic evolution, with active lineages being replaced over time, likely due to host restriction factors that silence their expression.
  • KRAB-associated protein 1 (KAP1) is a key cofactor for KRAB-containing zinc finger proteins (KRAB-ZFPs) involved in restricting endogenous retroviruses.

Purpose of the Study:

  • To investigate the role of KAP1 in repressing specific Long interspersed element-1 (L1) lineages in human embryonic stem cells (hES cells).
  • To identify the mechanisms controlling the expression of different L1 lineages during early embryogenesis.
  • To understand the evolutionary dynamics of L1 control in mammals.

Main Methods:

  • KAP1 knockdown experiments in hES cells.
  • Analysis of L1 element expression patterns.
  • Depletion of DNA methyltransferases in hES cells.
  • Identification of L1-binding KRAB-ZFPs.

Main Results:

  • KAP1 represses a distinct subset of ancient L1 lineages in hES cells, active between 26.8 and 7.6 million years ago.
  • KAP1 knockdown induced expression of KAP1-bound L1 elements, but not younger, human-specific L1 elements (L1Hs).
  • L1Hs expression was stimulated by DNA methyltransferase depletion, indicating regulation by PIWI-piRNA pathways in hES cells.
  • A specific L1-binding KRAB-ZFP was identified, suggesting broader L1 recognition by this protein family.

Conclusions:

  • Early embryonic control of L1 elements is an evolutionarily adaptable process.
  • Newly emerged L1 lineages are initially suppressed by DNA methylation and small RNA pathways before KAP1-mediated repression is established.
  • This study reveals distinct regulatory mechanisms for ancient versus recent L1 elements in human development.