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The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
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Related Experiment Video

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Reverse Genetic Approach to Identify Regulators of Pigmentation using Zebrafish
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Repressor elements provide insights into tissue development and phenotypes in pigs.

Yue-Dong Zhang1,2,3,4, Chao Guo1,5, Hang Liu1,2

  • 1Key Laboratory of Genetic Evolution & Animal Models and Yunnan Key Laboratory of Molecular Biology of Domestic Animals, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650223, China.

Zoological Research
|October 31, 2024
PubMed
Summary
This summary is machine-generated.

This study maps pig repressor elements, revealing super repressor elements (SREs) and typical repressor elements (TREs) that regulate gene expression. These findings offer insights into economically relevant traits and provide a foundational resource for future pig genomics research.

Keywords:
KLF4PigRegulatory modelRepressor elementsSilencerSuper repressor elementsTissue development

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Area of Science:

  • Genomics
  • Epigenetics
  • Developmental Biology

Background:

  • Repressor elements critically impact pig phenotypes, but their functions are poorly understood.
  • Identifying and characterizing these elements is crucial for agricultural applications and genetic research.

Purpose of the Study:

  • To comprehensively map and characterize repressor elements in the pig genome.
  • To differentiate the regulatory roles of super repressor elements (SREs) and typical repressor elements (TREs).

Main Methods:

  • Utilized H3K27me3 profiling, ATAC-seq, and RNA-seq across six tissues from three embryonic layers.
  • Identified 2,034 SREs and 22,223 TREs in the pig genome.
  • Analyzed conservation, regulatory scope, and developmental timing of repressor element activity.

Main Results:

  • Discovered a significant number of conserved repressor elements across mesodermal and ectodermal tissues.
  • Characterized SREs as having tight, localized gene regulation, while TREs exhibit broader, weaker control.
  • Observed repression initiation during stem cell to progenitor cell differentiation in neuronal tissues.
  • Identified cooperative and additive effects of repressor elements on KLF4 expression.

Conclusions:

  • This study presents the first comprehensive map of pig repressor elements.
  • The findings provide a vital reference for understanding gene regulation, developmental processes, and economically relevant traits in pigs.
  • Elucidates distinct regulatory mechanisms of SREs and TREs, advancing pig genomics and breeding strategies.