Transdifferentiation occurs without resetting development- specific DNA methylation, a key determinant of full- function cell identity

• 成果类型: Article
• 署名作者: Radwan, Ahmed; Eccleston, Jason; Sabag, Ofra; Marcus, Howard; Sussman, Jonathan; Ouro, Alberto; Rahamim, Moran; Azagury, Meir; Azria, Batia; Stanger, Ben Z.; Cedar, Howard; Buganim, Yosef
• 署名单位: Hebrew University of Jerusalem; University of Pennsylvania; University of Pennsylvania
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-14878
• DOI: 10.1073/pnas.2411352121
• 发表日期: 2024-09-24
• 关键词: mouse embryo; fibroblasts; conversion; pattern

摘要

A number of studies have demonstrated that it is possible to directly convert one cell type to another by factor- mediated transdifferentiation, but in the vast majority of cases, the resulting reprogrammed cells are unable to maintain their new cell identity for prolonged culture times and have a phenotype only partially similar to their endogenous counterparts. To better understand this phenomenon, we developed an analytical approach for better characterizing trans- differentiation- associated changes in DNA methylation, a major determinant of long- term cell identity. By examining various models of transdifferentiation both in vitro and in vivo, our studies indicate that despite convincing expression changes, transdifferentiated cells seem unable to alter their original developmentally mandated methylation patterns. We propose that this blockage is due to basic developmental limitations built into the regulatory sequences that govern epigenetic programming of cell identity. These results shed light on the molecular rules necessary to achieve complete somatic cell reprogramming.