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Related Concept Videos

Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

Overview
Alternative RNA Splicing02:18

Alternative RNA Splicing

Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
Mutations01:39

Mutations

Overview
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

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Detection of Nuclear Blebbing and DNA Leakage in Mammalian Cells by Immunofluorescence
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Detection of Nuclear Blebbing and DNA Leakage in Mammalian Cells by Immunofluorescence

Published on: January 17, 2025

Genetic instability syndromes with progeroid features.

K Neveling1, A Bechtold, H Hoehn

  • 1University of Würzburg, School of Medicine, Department of Human and Medical Genetics, Biozentrum, am Hubland, 97074, Würzburg, Germany.

Zeitschrift Fur Gerontologie Und Geriatrie
|October 19, 2007
PubMed
Summary
This summary is machine-generated.

Rare genetic instability syndromes impact chromosomes, telomeres, and nuclear envelopes, causing premature aging. Fanconi anemia, uniquely sensitive to oxidative stress, serves as a model for aging theories.

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Genetic Studies of Human DNA Repair Proteins Using Yeast as a Model System
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Genetic Studies of Human DNA Repair Proteins Using Yeast as a Model System
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Published on: March 18, 2010

Area of Science:

  • Genetics
  • Molecular Biology
  • Gerontology

Background:

  • Rare human genetic instability syndromes manifest at chromosomal, telomeric, and nuclear envelope levels.
  • Mutations in Lamin A/C cause nuclear envelope destabilization, leading to chromatin defects and Hutchinson-Gilford progeria syndrome.
  • Defective telomerase function in Dyskeratosis congenita links short telomeres to premature aging.

Purpose of the Study:

  • To explore rare human genetic instability syndromes.
  • To highlight the connection between genetic defects, cellular damage, and premature aging phenotypes.
  • To present Fanconi anemia as a model for the free radical theory of aging.

Main Methods:

  • Review and discussion of genetic instability syndromes.
  • Analysis of molecular mechanisms including gene mutations, telomere function, and DNA repair.
  • Examination of cellular responses to oxidative stress.

Main Results:

  • Hutchinson-Gilford progeria syndrome results from Lamin A/C gene mutations affecting chromatin and gene expression.
  • Dyskeratosis congenita and Werner syndrome exemplify premature aging linked to telomere defects and DNA repair issues, respectively.
  • Fanconi anemia cells exhibit unique sensitivity to oxidative stress, leading to DNA damage accumulation and progeroid features.

Conclusions:

  • Genetic instability syndromes provide insights into aging processes.
  • Nuclear envelope integrity, telomere length, and DNA repair are crucial for preventing premature aging.
  • Fanconi anemia is a key model for understanding oxidative stress in aging and disease.