Related Experiment Video
Updated: May 17, 2026
10:10
HOX Loci Focused CRISPR/sgRNA Library Screening Identifying Critical CTCF Boundaries
Published on: March 31, 2019
Cdx1 interacts physically with a subset of Hox proteins
Christine A Lafontaine1, Stephanie Grainger, Bradley L Hess
1Department of Cellular and Molecular Medicine, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, Canada.
Biochemistry
|November 6, 2012
Summary
This study reveals the first physical interactions between Cdx and Hox proteins, crucial for vertebral development. These interactions, occurring within the homeodomain, may modulate gene regulation and protein function.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- Cdx and Hox gene families encode transcription factors essential for anterior-posterior vertebral patterning.
- Cdx proteins directly regulate Hox gene expression, and both interact with other homeodomain factors.
Purpose of the Study:
- To investigate potential physical interactions between Cdx and Hox proteins.
- To characterize the nature and functional implications of these interactions.
Main Methods:
- Co-immunoprecipitation assays to detect protein associations.
- Site-directed mutagenesis to identify key interaction domains and residues.
- Reporter gene assays to assess transcriptional modulation.
Main Results:
- Cdx1 physically associates with a subset of Hox proteins.
- The interaction is localized to the homeodomain and depends on specific Hox arginine residues and N-terminal sequences.
- In vivo interactions were more promiscuous, suggesting additional regulatory mechanisms.
- The Cdx-Hox interaction modulates transcriptional activity on a Hox-responsive element.
Conclusions:
- This study provides the first evidence of direct Cdx-Hox protein interactions.
- These interactions may play a significant role in modulating the functions of both Cdx and Hox proteins during development.
Related Concept Videos
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...
02:50Dosage Compensation
In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...
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...
03:17Inheritance of Chromatin Structures
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
01:33Pleiotropy
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,...
02:38Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...