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Cameron S McAlpine1,2,3, Máté G Kiss1,3, Faris M Zuraikat4,5

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Sleep disruption alters the epigenome of hematopoietic stem cells, increasing proliferation and reducing diversity. This study reveals sleep is crucial for maintaining hematopoietic health and limiting inflammation.

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Area of Science:

  • Hematology
  • Epigenetics
  • Sleep Science

Background:

  • Sleep's restorative functions are substantial, yet prolonged effects of sleep disruption remain unclear.
  • While catch-up sleep partially mitigates sleep debt, its long-term impact on cellular mechanisms is not fully understood.

Purpose of the Study:

  • To investigate the impact of sleep interruption on the epigenome of hematopoietic stem and progenitor cells (HSPCs).
  • To elucidate the mechanisms by which sleep influences hematopoietic clonal diversity and inflammatory responses.

Main Methods:

  • Analysis of HSPC epigenome changes following sleep interruption.
  • Hematopoietic clonal tracking and mathematical modeling to assess clonal diversity and genetic drift.
  • Investigation of HSPC proliferation and cell fate commitment (myeloid skewing).

Main Results:

  • Sleep interruption restructures the HSPC epigenome, increasing proliferation and accelerating genetic drift.
  • Sleep fragmentation leads to reduced hematopoietic clonal diversity and skews cell commitment toward a myeloid fate.
  • Sleep restriction in humans also alters the HSPC epigenome and activates hematopoiesis, priming for inflammation.

Conclusions:

  • Sleep is essential for maintaining hematopoietic system integrity by regulating the HSPC epigenome.
  • Sleep calibrates the hematopoietic epigenome, constrains inflammatory output, and preserves clonal diversity, slowing system decay.
  • Findings highlight the critical role of sleep in preventing accelerated aging and inflammatory diseases originating from hematopoietic stem cells.