TrxG Complex Catalytic and Non-catalytic Activity Play Distinct Roles in Pancreas Progenitor Specification and Differentiation.
Cell Rep
; 28(7): 1830-1844.e6, 2019 08 13.
Article
em En
| MEDLINE
| ID: mdl-31412250
ABSTRACT
Appropriate regulation of genes that coordinate pancreas progenitor proliferation and differentiation is required for pancreas development. Here, we explore the role of H3K4 methylation and the Trithorax group (TrxG) complexes in mediating gene expression during pancreas development. Disruption of TrxG complex assembly, but not catalytic activity, prevented endocrine cell differentiation in pancreas progenitor spheroids. In vivo loss of TrxG catalytic activity in PDX1+ cells increased apoptosis and the fraction of progenitors in the G1 phase of the cell cycle. Pancreas progenitors were reallocated to the acinar lineage, primarily at the expense of NEUROG3+ endocrine progenitors. Later in development, acinar and endocrine cell numbers were decreased, and increased gene expression variance and reduced terminal marker activation in acinar cells led to their incomplete differentiation. These findings demonstrate that TrxG co-activator activity is required for gene induction, whereas TrxG catalytic activity and H3K4 methylation help maintain transcriptional stability.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Pâncreas
/
Células-Tronco
/
Tiorredoxinas
/
Diferenciação Celular
/
Regulação da Expressão Gênica no Desenvolvimento
/
Linhagem da Célula
/
Organogênese
Limite:
Animals
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article