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Examination of the Telomere G-overhang Structure in Trypanosoma brucei
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Telomeres Increasingly Develop Aberrant Structures in Aging Humans.

Virginia Boccardi1, Luigi Cari2, Giuseppe Nocentini2

  • 1Department of Medicine, Section of Gerontology and Geriatrics, Santa Maria della Misericordia Hospital.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|November 3, 2018
PubMed
Summary
This summary is machine-generated.

Telomere shortening accelerates aging. Beyond the end replication problem, other telomere replication defects, like sister chromatid fusions, increase with age, contributing to human aging.

Keywords:
HealthHuman agingTelomeres

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Area of Science:

  • Genetics
  • Cell Biology
  • Gerontology

Background:

  • Telomere shortening is linked to aging and age-related diseases.
  • The 'end replication problem' was the primary explanation for telomere erosion.
  • Emerging evidence suggests other replication defects also impact telomere length.

Purpose of the Study:

  • To investigate whether telomere replication defects, beyond the end replication problem, contribute to age-associated telomere erosion in human tissues.
  • To analyze the prevalence of aberrant telomeric structures in relation to chronological age.

Main Methods:

  • Analysis of peripheral blood mononuclear cells from 35 healthy individuals aged 23-101 years.
  • Microscopic examination of metaphase chromosomes to detect fragile telomeres, sister telomere loss, and sister telomere chromatid fusions.
  • Correlation of the frequency of these aberrant structures with donor age.

Main Results:

  • Telomeres showed increased aberrant structures with advancing age.
  • Fragile telomere percentages rose until adulthood but then plateaued.
  • Sister telomere loss and sister telomere chromatid fusions increased progressively throughout the entire lifespan.

Conclusions:

  • Replication defects in telomeric repeats, beyond the end replication problem, are implicated in age-associated telomere erosion.
  • These defects, particularly sister telomere loss and fusions, accumulate throughout human life.
  • Findings suggest a significant role for non-end-replication-problem telomere defects in the human aging process.