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Take a walk on the KRAB side.

Olga Rosspopoff1, Didier Trono1

  • 1School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.

Trends in Genetics : TIG
|September 16, 2023
PubMed
Summary
This summary is machine-generated.

Krüppel-associated box (KRAB)-containing zinc finger proteins (KZFPs) repress transposable elements. Their evolution shows KRAB domain variations, enabling functions beyond simple repression.

Keywords:
DUF3669 domainKRAB zinc finger proteinsPRDM9SCAN domaintransposable elements

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Molecular biology

Background:

  • Canonical Krüppel-associated box (KRAB)-containing zinc finger proteins (KZFPs) are key repressors of transposable elements (TEs).
  • KZFPs utilize the KRAB domain to recruit KRAB-associated protein (KAP)1, forming heterochromatin to silence TEs.
  • KZFP gene families expanded significantly in vertebrates, correlating with TE activity.

Purpose of the Study:

  • To review the evolutionary history of KZFPs.
  • To explore the functional diversification of KRAB domains and other KZFP domains.
  • To discuss KAP1-independent functions of KZFPs.

Main Methods:

  • Comparative genomics analysis of KZFP evolution across species.
  • Bioinformatic analysis of KRAB, SCAN, and DUF3669 domain variations.
  • Literature review of functional studies on KZFPs.

Main Results:

  • KZFP genes originated in the common ancestor of lobe-finned fish and tetrapods ~420 million years ago.
  • Significant expansion and lineage-specific diversification of KZFP repertoires occurred.
  • Variations in KRAB, SCAN, and DUF3669 domains indicate functional divergence beyond TE repression.

Conclusions:

  • The evolution of KZFPs is characterized by diversification and adaptation.
  • Ancestral KZFPs with variant domains acquired novel, KAP1-independent functions.
  • Understanding KZFP evolution provides insights into genome defense mechanisms and gene regulation.