The Role of KRAB-ZFPs in Transposable Element Repression and Mammalian Evolution

Overview

Journal Trends Genet

Specialty Genetics

Date 2017 Sep 23

PMID 28935117

Citations 107

Authors

Peng Yang

Yixuan Wang

Todd S Macfarlan

Affiliations

Soon will be listed here.

Abstract

Kruppel-associated box zinc-finger proteins (KRAB-ZFPs) make up the largest family of transcription factors in humans. These proteins emerged in the last common ancestor of coelacanth and tetrapods, and have expanded and diversified in the mammalian lineage. Although their mechanism of transcriptional repression has been well studied for over a decade, the DNA-binding activities and the biological functions of these proteins have been largely unexplored. Recent large-scale ChIP-seq studies and loss-of-function experiments have revealed that KRAB-ZFPs play a major role in the recognition and transcriptional silencing of transposable elements (TEs), consistent with an 'arms race model' of KRAB-ZFP evolution against invading TEs. However, this model is insufficient to explain the evolution of many KRAB-ZFPs that appear to domesticate TEs for novel host functions. We highlight some of the mammalian regulatory innovations driven by specific KRAB-ZFPs, including genomic imprinting, meiotic recombination hotspot choice, and placental growth.

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