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Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...
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Tonicity describes the amount of solute in a solution. The measure of the tonicity of a solution, or the total amount of solutes dissolved in a specific amount of solution, is called its osmolarity. Three terms—hypotonic, isotonic, and hypertonic—are used to relate the osmolarity of a cell to the osmolarity of the extracellular fluid that contains the cells. In a hypotonic solution, such as tap water, the extracellular fluid has a lower concentration of solutes than the fluid inside...
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Whole Body Regeneration01:33

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Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential;...
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The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
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[Hox Genes and Animal Regeneration].

E L Novikova, N I Bakalenko, A Y Nesterenko

    Ontogenez
    |October 2, 2018
    PubMed
    Summary

    Hox genes establish positional information during embryonic development and regeneration. Their role in specifying body axes and guiding tissue repair highlights their conserved function across life stages.

    Area of Science:

    • Developmental Biology
    • Regenerative Medicine
    • Genetics

    Background:

    • Positional information guides cell location and fate during development.
    • Hox genes are crucial for establishing the anterior/posterior (A/P) axis and body regionalization.
    • Hox genes are also expressed in adult organisms and implicated in regeneration.

    Purpose of the Study:

    • To explore the role of Hox genes in providing positional information during regeneration.
    • To understand how Hox gene expression dynamics contribute to adult tissue repair.
    • To investigate the conserved function of Hox genes in both embryonic and regenerative processes.

    Main Methods:

    • Comparative analysis of Hox gene expression patterns in various animal models.
    • Investigating Hox gene involvement in regeneration across different evolutionary clades.

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  • Studying the dynamics of Hox gene transcription following tissue damage.

    • Main Results:

    • Hox genes are involved in regionalizing and specifying newly formed structures during regeneration.
    • Hox gene expression patterns in adults suggest a role in creating positional information.
    • Rapid reorganization of Hox gene expression may accelerate regenerative processes.

    Conclusions:

    • Hox genes play a conserved role in establishing positional information from embryonic development through adult regeneration.
    • Understanding Hox gene function in regeneration could offer insights into improving tissue repair mechanisms.
    • Hox genes are essential for consistent and efficient biological repair processes.