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Long telomere inheritance through budding yeast sexual cycles.

Vasilisa Sidarava1, Sarah Mearns1, David Lydall1

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Yeast telomere length inheritance shows short telomeres normalize quickly after mating, but long telomeres can persist for many cell divisions. This complex inheritance pattern may inform human telomere syndrome research.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Eukaryotic chromosome ends are protected by telomeres, which consist of repetitive DNA sequences bound by specific proteins.
  • Mutations in telomere regulatory genes in humans cause short or long telomere syndromes, often exhibiting genetic anticipation.
  • Telomere length homeostasis mechanisms are conserved between mammals and yeast.

Purpose of the Study:

  • To investigate telomere length inheritance patterns during the sexual cycle in yeast.
  • To analyze how short and long telomeres are transmitted through mating and meiosis.
  • To understand the complex relationship between telomere length, inheritance, and mutations.

Main Methods:

  • Analysis of single telomeres in yeast, distinguishing from bulk telomere analysis.
  • Mating experiments between haploid yeast with short telomeres and wild-type yeast.
  • Tracking telomere length over multiple cell divisions (mitosis) and meiotic cycles.

Main Results:

  • Short telomere lengths rapidly normalized within 30 cell divisions after mating.
  • Long telomeres inherited from one parent persisted for over 200 mitotic cell divisions.
  • Long telomeres were transmitted through multiple meiotic rounds, independent of specific mutations.

Conclusions:

  • Telomere length inheritance in yeast is complex, with differential transmission of short and long telomeres.
  • Long telomere persistence suggests mechanisms beyond simple mutation-based length determination.
  • Findings offer insights into telomere biology relevant to human telomere syndromes.