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M-Cdk Drives Transition Into Mitosis02:15

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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
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Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Updated: Oct 17, 2025

Structure-function Studies in Mouse Embryonic Stem Cells Using Recombinase-mediated Cassette Exchange
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A mouse-specific retrotransposon drives a conserved Cdk2ap1 isoform essential for development.

Andrew J Modzelewski1, Wanqing Shao2, Jingqi Chen1

  • 1Division of Cellular and Developmental Biology, MCB Department, University of California, Berkeley, Berkeley, CA 94720, USA.

Cell
|October 13, 2021
PubMed
Summary

Transposable elements, specifically long terminal repeat retrotransposon promoters, drive gene regulation during early mammalian development. Species-specific transposon promoters generate conserved protein isoforms with novel functions, impacting developmental divergence.

Keywords:
Cdk2Cdk2ap1cell proliferationimplantationmammalsmousepreimplantation embryospromotersretrotransposonstransposons

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Area of Science:

  • Genomics
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Retrotransposons are mobile genetic elements that play crucial roles in gene regulation during development and disease.
  • Their transient induction during early embryogenesis suggests significant functional importance across species.

Purpose of the Study:

  • To characterize the transient retrotransposon induction during preimplantation development in eight mammalian species.
  • To investigate the role of retrotransposon-driven gene regulation in mammalian evolutionary divergence.

Main Methods:

  • Comparative analysis of retrotransposon activity across eight mammalian species during preimplantation development.
  • Functional characterization of a mouse-specific MT2B2 retrotransposon promoter and its role in Cdk2ap1 regulation.
  • Investigation of evolutionary conservation and species-specific expression of Cdk2ap1 isoforms.

Main Results:

  • Induced retrotransposons show conserved preimplantation profiles and regulatory functions, particularly via long terminal repeat (LTR) promoters.
  • A mouse MT2B2 retrotransposon promoter generates a truncated Cdk2ap1 (Cdk2ap1ΔN) essential for preimplantation proliferation and embryo implantation.
  • Cdk2ap1ΔN is conserved in sequence and function but driven by different promoters across mammals, with expression correlating to preimplantation development duration.

Conclusions:

  • Species-specific transposon promoters can generate evolutionarily conserved protein isoforms with novel, species-specific functions.
  • This mechanism contributes to essential biological divergence and adaptation during mammalian evolution.
  • Retrotransposon-derived regulatory elements are critical for orchestrating species-specific developmental trajectories.