RUNX1 and YY1 modulate neuronal fate and energy metabolism in Alzheimer's disease

Loss of neuronal identity and metabolic dysfunction are features of Alzheimers disease (AD), yet the upstream-acting molecular drivers remain incompletely understood. By integrating multi-omics data from patient-derived induced neurons (iNs) and AD post-mortem human brains, we discovered that AD neurons express two master transcription factors (TFs), RUNX1 and YY1. While these TFs are primarily expressed during development where they play fundamental roles in cell fate determination and cellular bioenergetics, respectively, they can be reactivated in adult neurons in response to stress. To understand their functional role in AD neurons, we overexpressed RUNX1 or YY1 in aged iNs and found that the expression of each TF was sufficient to recapitulate two AD-associated features. Specifically, RUNX1 overexpression caused loss of neuronal fate, whereas YY1 overexpression regulated gene regulatory programs associated with metabolic dysfunction. Conversely, downregulation of either TF, in AD iNs, reinstated gene regulatory programs associated with a healthy mature neuronal phenotype. Together, these findings identify two transcriptional master regulators of the AD neuronal phenotype and establish a mechanistic foundation for further studying their role in the pathogenesis of AD and as putative therapeutical targets for the treatment of AD and age-associated neurodegeneration.