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Related Concept Videos

Conserved Binding Sites01:49

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
General Transcription Factors01:30

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
Gene Duplication and Divergence02:37

Gene Duplication and Divergence

The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Gene Families01:57

Gene Families

Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Diversity of Archaea IV01:29

Diversity of Archaea IV

Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist thermal...

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Related Experiment Video

Updated: Jun 2, 2026

Expression Analysis of Mammalian Linker-histone Subtypes
14:40

Expression Analysis of Mammalian Linker-histone Subtypes

Published on: March 19, 2012

Homeodomain subtypes and functional diversity.

Thomas R Bürglin1

  • 1Department of Biosciences and Nutrition, and Center for Biosciences, Karolinska Institutet, Hälsovägen 7, Novum, SE 141 83, Huddinge, Sweden, Thomas.burglin@ki.se.

Sub-Cellular Biochemistry
|May 11, 2011
PubMed
Summary
This summary is machine-generated.

Homeodomain proteins, encoded by homeobox genes, are crucial transcription factors regulating gene expression in development. They play vital roles in pattern formation and cell differentiation across diverse organisms.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Homeodomains are conserved protein domains (~60 amino acids) encoded by homeobox genes.
  • Homeodomain proteins function as DNA-binding transcription factors (TFs).
  • These TFs are essential for developmental processes in animals, fungi, and plants.

Purpose of the Study:

  • To summarize the critical roles of homeodomain proteins in organismal development.
  • To highlight the classification and organization of homeobox genes, including chromosomal clusters.
  • To emphasize their function in gene regulation, pattern formation, and cell fate determination.

Main Methods:

  • Review of existing literature on homeobox genes and homeodomain proteins.
  • Analysis of conserved protein domains and gene clustering.
  • Examination of functional studies related to development and differentiation.

Main Results:

  • Homeodomain proteins are key regulators of gene expression during development and differentiation.
  • Thousands of homeobox genes exist, categorized into various classes, often with linked domains.
  • The HOX cluster, particularly important for anterior-posterior axis patterning, is conserved across bilaterian animals.

Conclusions:

  • Homeobox genes and their encoded homeodomain proteins are fundamental to virtually all aspects of organismal development.
  • Understanding homeodomain protein function is crucial for deciphering developmental mechanisms.
  • The conserved nature of homeobox genes, like the HOX cluster, underscores their evolutionary importance.