Epigenetic reversal of hematopoietic stem cell aging in Phf6-knockout mice.
Agnieszka A WendorffS Aidan QuinnSilvia AlvarezJessie A BrownMayukh BiswasThomas S GunningTeresa PalomeroAdolfo A FerrandoPublished in: Nature aging (2022)
Aging is characterized by an accumulation of myeloid-biased hematopoietic stem cells (HSCs) with reduced developmental potential. Genotoxic stress and epigenetic alterations have been proposed to mediate age-related HSC loss of regenerative and self-renewal potential. However, the mechanisms underlying these changes remain largely unknown. Genetic inactivation of the plant homeodomain 6 (Phf6) gene, a nucleolar and chromatin-associated factor, antagonizes age-associated HSC decline. Immunophenotyping, single-cell transcriptomic analyses and transplantation assays demonstrated markedly decreased accumulation of immunophenotypically defined HSCs, reduced myeloid bias and increased hematopoietic reconstitution capacity with preservation of lymphoid differentiation potential in Phf6-knockout HSCs from old mice. Moreover, deletion of Phf6 in aged mice rejuvenated immunophenotypic, transcriptional and functional hallmarks of aged HSCs. Long-term HSCs from old Phf6-knockout mice showed epigenetic rewiring and transcriptional programs consistent with decreased genotoxic stress-induced HSC aging. These results identify Phf6 as an important epigenetic regulator of HSC aging.
Keyphrases
- gene expression
- stress induced
- stem cells
- dna methylation
- transcription factor
- bone marrow
- single cell
- genome wide
- hematopoietic stem cell
- high throughput
- acute myeloid leukemia
- dendritic cells
- cell therapy
- copy number
- dna damage
- mesenchymal stem cells
- public health
- metabolic syndrome
- high fat diet induced
- wild type
- immune response
- adipose tissue
- type diabetes
- risk assessment
- skeletal muscle
- cell wall