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Related Concept Videos

Cis-regulatory Sequences02:02

Cis-regulatory Sequences

Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...

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The zebrafish genes encoding the Polycomb repressive complex (PRC) 1.

Perrine Le Faou1, Pamela Völkel, Pierre-Olivier Angrand

  • 1Chromatinomics, Interdisciplinary Research Institute, University Lille Nord de France, Université de Lille 1 Sciences et Technologies, 50 Avenue Halley, Parc Scientifique de la Haute Borne, Villeneuve d'Ascq Cedex, France.

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|January 4, 2011
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Summary

Polycomb Repressive Complex 1 (PRC1) genes in zebrafish were identified, revealing conserved components and potential for diverse protein complexes early in vertebrate evolution. This suggests isoforms play a significant biological role.

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Area of Science:

  • Epigenetics and Gene Regulation
  • Developmental Biology
  • Comparative Genomics

Background:

  • Polycomb repression is crucial for gene regulation in development and disease, mediated by Polycomb Repressive Complexes 1 and 2 (PRC1 and PRC2).
  • PRC2 deposits the H3K27me3 mark, which recruits PRC1, a complex with diverse subunit compositions in different species.
  • Understanding PRC1 evolution and diversity is key to deciphering its regulatory roles.

Purpose of the Study:

  • To identify and classify zebrafish genes encoding the Polycomb Repressive Complex 1 (PRC1) subunits.
  • To investigate the evolutionary origins and combinatorial potential of PRC1 complexes in vertebrates.
  • To explore the conservation of gene organization, synteny, and transcriptional regulation of PRC1 components.

Main Methods:

  • Homology searches were performed to identify zebrafish PRC1 genes.
  • Phylogenetic, gene organization, and gene location analyses were used for gene classification.
  • Transcript analyses were conducted to study isoform synthesis.

Main Results:

  • Nineteen zebrafish genes encoding PRC1 subunits were identified, including 8 Pc, 6 Psc, 4 Ph, and 1 Sce orthologs.
  • These findings suggest that the combinatorial diversity of PRC1 complexes emerged early in vertebrate evolution.
  • Conserved gene organization, synteny, and transcriptional regulation of PRC1 components, including isoform synthesis, were observed.

Conclusions:

  • Zebrafish possess a comprehensive set of PRC1 components, reflecting early vertebrate evolution of complex combinatorial possibilities.
  • The conservation of gene organization and isoform production highlights the potential biological significance of PRC1 isoforms.
  • This study provides a foundation for further research into the functional roles of PRC1 complexes and their isoforms in zebrafish.