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A persistent variant telomere sequence in a human pedigree.

Angela M Hinchie1,2, Samantha L Sanford3,4, Kelly E Loughridge1,2

  • 1Dorothy P. and Richard P. Simmons Center for Interstitial Lung Disease, University of Pittsburgh, Pittsburgh, PA, USA.

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Summary
This summary is machine-generated.

A rare variant in the telomere template sequence allows for a non-canonical telomere sequence in humans. This variant, despite disrupting protein binding, is incorporated into chromosomes and may alter telomere length dynamics.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Telomeres, composed of TTAGGG repeats, are crucial for chromosome stability and preventing DNA damage responses.
  • The shelterin protein complex binds telomeres, and alterations in telomere sequence can impair this binding, leading to cellular toxicity.
  • Telomerase is the enzyme responsible for telomere elongation using a template sequence.

Purpose of the Study:

  • To identify and characterize a family with a variant in the telomere template sequence of telomerase.
  • To investigate the functional consequences of a non-canonical telomere sequence on shelterin binding and telomere dynamics.
  • To understand how telomeres tolerate sequence variations while remaining functional.

Main Methods:

  • Genetic sequencing to identify the telomere template variant.
  • Analysis of telomere sequence composition in affected family members.
  • Assessment of telomerase repeat addition processivity.
  • Evaluation of POT1 binding to variant telomeres.
  • Cellular assays to determine the incorporation of the variant sequence into chromosomes.

Main Results:

  • A family was identified with an inherited variant in the telomere template sequence, resulting in a non-canonical telomere sequence.
  • Approximately 9% of telomeres converted to the novel sequence in one family member with no reported medical issues.
  • The variant template reduced telomerase processivity and decreased binding of the telomere-binding protein POT1.
  • Despite disruptions, the non-canonical sequence was readily incorporated into cellular chromosomes.
  • Incorporation of the variant sequence appeared to prevent POT1-mediated inhibition of telomerase.

Conclusions:

  • Telomeres can tolerate significant sequence variations (degeneracy) and remain functional.
  • The identified variant provides insights into how non-canonical telomere sequences can influence telomere length regulation.
  • This study highlights the adaptability of telomere maintenance mechanisms to sequence alterations.