Related Experiment Video
Updated: May 20, 2026
08:19
Quantitative Comparison of cis-Regulatory Element (CRE) Activities in Transgenic Drosophila melanogaster
Published on: December 19, 2011
The cis-regulatory code of Hox function in Drosophila.
Sebastian Sorge1, Nati Ha, Maria Polychronidou
1CellNetworks-Cluster of Excellence and Centre for Organismal Studies (COS) Heidelberg, Heidelberg University, Heidelberg, Germany.
The EMBO Journal
|July 12, 2012
Summary
Hox transcription factors (TFs) use specific DNA binding regions and enhancer structures to control gene expression. This study reveals how these regulatory codes ensure precise, cell-type-specific functions for TFs like Deformed (Dfd) and Ultrabithorax (Ubx).
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- Precise gene expression is crucial for organismal function, relying on transcription factors (TFs) and cis-regulatory DNA.
- Understanding cell type-specific TF activities remains a challenge.
Purpose of the Study:
- To investigate how widely expressed Hox TFs achieve cellular specificity.
- To identify Deformed (Dfd) TF binding regions in the Drosophila genome.
- To elucidate the mechanisms of TF functional specificity in vivo.
Main Methods:
- Genome-wide identification of Deformed (Dfd) TF binding regions in Drosophila.
- Analysis of architectural features within Hox cis-regulatory response elements (HREs).
- In vivo interaction studies of Dfd and Ultrabithorax (Ubx) with DNA.
Main Results:
- Hox cis-regulatory response element (HRE) structure is critical for cell type-specific gene expression.
- Dfd and Ultrabithorax (Ubx) interact with distinct, non-overlapping DNA regions in vivo.
- Distinct motif compositions and associations in Dfd and Ubx HREs explain their selective interactions.
Conclusions:
- Hox enhancers contain a regulatory code dictating TF specificity.
- The structural and compositional features of HREs are key to the functional specificity of Hox TFs.
- This work clarifies how Hox proteins achieve precise regulatory control in vivo.
Related Concept Videos
02:02Cis-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...
02:02Cis-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...
02:23Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
02:45The 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.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
02:33Hedgehog Signaling Pathway
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
02:32Position-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.