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Telomeres and Telomerase02:41

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In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Chemical Dimerization-Induced Protein Condensates on Telomeres
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Chemical Dimerization-Induced Protein Condensates on Telomeres

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Dysfunctional telomeres and hematological disorders.

Elena Fiorini1, Andrea Santoni1, Simona Colla1

  • 1Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.

Differentiation; Research in Biological Diversity
|January 15, 2018
PubMed
Summary
This summary is machine-generated.

Telomere biology disorders cause organ degeneration and bone marrow failure. Contrary to prior belief, telomere defects may promote, not protect against, hematological cancers.

Keywords:
DNA damage responseHematopoietic stem cellsMyelodysplastic syndromeTelomere biology disorders

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Area of Science:

  • Genetics and Molecular Biology
  • Hematology
  • Cell Biology

Background:

  • Telomere biology disorders (TBDs) stem from telomerase activity haploinsufficiency, leading to accelerated telomere shortening.
  • These disorders commonly manifest as degenerative diseases, particularly affecting tissues with high cell turnover, like the hematopoietic system.
  • Defects in telomere maintenance genes can lead to bone marrow (BM) failure syndromes, impairing blood cell production.

Purpose of the Study:

  • To review how telomere defects induce degenerative phenotypes across multiple organs.
  • To focus on the impact of telomere defects on the hematopoietic stem and progenitor cell compartment, including self-renewal and differentiation.
  • To discuss the association between TBDs and increased risk of myelodysplastic syndromes and other hematological malignancies.

Main Methods:

  • Literature review of studies on telomere biology disorders.
  • Analysis of the impact of telomere defects on hematopoietic stem cell (HSC) function.
  • Examination of the relationship between telomere defects and cancer development, including somatic mutations in shelterin components.

Main Results:

  • Telomere defects contribute to degenerative phenotypes in various organs.
  • Impacts on hematopoietic stem and progenitor cells include compromised self-renewal and differentiation.
  • Telomere disorders are linked to an increased risk of myelodysplastic syndromes and hematological malignancies.

Conclusions:

  • Telomere defects are implicated in a range of degenerative diseases and BM failure.
  • The role of telomere defects in cancer is complex, challenging the notion of them being solely cancer-protective.
  • Further research into shelterin components and somatic mutations is crucial for understanding the cancer-promoting role of telomere defects.