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Related Concept Videos

Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Animal Mitochondrial Genetics02:59

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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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Meiosis I03:09

Meiosis I

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Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
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Replicative Cell Senescence02:15

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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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The Effect of Aging on Tissues01:19

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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The Nucleolus02:55

The Nucleolus

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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Updated: Dec 29, 2025

Combining Magnetic Sorting of Mother Cells and Fluctuation Tests to Analyze Genome Instability During Mitotic Cell Aging in Saccharomyces cerevisiae
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Mitonuclear genomics and aging.

Joseph C Reynolds1, Conscience P Bwiza1, Changhan Lee2,3,4

  • 1Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, 90089, USA.

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This summary is machine-generated.

Mitochondria and their DNA (mtDNA) are crucial for aging research, complementing nuclear genomes. Understanding their communication network offers new insights into aging and age-related diseases.

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Area of Science:

  • Cellular and Molecular Biology
  • Genetics
  • Aging Research

Background:

  • Human cells possess two genomes: nuclear and mitochondrial.
  • The mitochondrial genome (mtDNA) is a reduced 16.5 Kb circular DNA, originating from endosymbiotic bacteria.
  • Mitochondrial-derived peptides (MDPs) are expanding the known genetic repertoire of mtDNA.

Purpose of the Study:

  • To explore mitochondrial biology and communication in the context of aging.
  • To highlight the role of the mitochondrial genome alongside the nuclear genome in regulating lifespan and healthspan.
  • To integrate the study of both mitonuclear genomes for a comprehensive understanding of aging.

Main Methods:

  • Review of current literature on mitochondrial biology and aging.
  • Discussion of mitochondrial communication pathways.
  • Analysis of the interplay between nuclear and mitochondrial genomes in aging processes.

Main Results:

  • Mitochondria and mtDNA play a significant, yet previously underappreciated, role in aging.
  • Mitochondrial communication is a key factor in regulating aging and age-related diseases.
  • A co-evolved network of nuclear and mitochondrial genomes governs lifespan and healthspan.

Conclusions:

  • Accounting for both mitonuclear genomes is essential for advancing aging research.
  • Mitochondrial biology and communication offer novel therapeutic targets for age-related conditions.
  • A holistic approach mapping genetic and molecular networks is needed to understand aging comprehensively.