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Related Concept Videos

Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Pleiotropy01:33

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
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Related Experiment Video

Updated: May 26, 2026

HOX Loci Focused CRISPR/sgRNA Library Screening Identifying Critical CTCF Boundaries
10:10

HOX Loci Focused CRISPR/sgRNA Library Screening Identifying Critical CTCF Boundaries

Published on: March 31, 2019

A partner evokes latent differences between Hox proteins.

Aseem Z Ansari1, Kimberly J Peterson-Kaufman

  • 1Department of Biochemistry and The Genome Center, University of Wisconsin, Madison, Madison, WI 53706, USA. ansari@biochem.wisc.edu

Cell
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

Hox proteins control animal development but bind similar DNA. A shared cofactor, Exd, refines Hox binding specificities, ensuring they target the correct genes for precise body patterning.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Hox transcription factors are crucial for anterior-posterior patterning in animals.
  • Despite binding similar DNA sequences in vitro, Hox proteins regulate distinct downstream genes.

Discussion:

  • The study investigates how Hox proteins achieve target specificity despite binding related DNA motifs.
  • Slattery et al. identify Exd as a common cofactor that modulates Hox protein DNA-binding properties.

Key Insights:

  • Exd accentuates latent sequence specificities of eight different Hox proteins.
  • This cofactor directs Hox proteins to their relevant genomic binding sites, resolving functional ambiguity.
  • The findings reveal a mechanism for achieving precise gene regulation by transcription factors with degenerate DNA binding.

Outlook:

  • Further research could explore cofactor-mediated specificity for other transcription factor families.
  • Understanding these mechanisms is vital for deciphering complex gene regulatory networks in development and disease.
  • This work provides a foundation for investigating how cofactor interactions fine-tune developmental programs.