Language
English
Publication Date
9-1-2023
Journal
Development
DOI
10.1242/dev.201535
PMID
37676777
PMCID
PMC10499029
PubMedCentral® Posted Date
9-7-2023
PubMedCentral® Full Text Version
Post-print
Abstract
Meiotically competent oocytes in mammals undergo cyclic development during folliculogenesis. Oocytes within ovarian follicles are transcriptionally active, producing and storing transcripts required for oocyte growth, somatic cell communication and early embryogenesis. Transcription ceases as oocytes transition from growth to maturation and does not resume until zygotic genome activation. Although SUMOylation, a post-translational modification, plays multifaceted roles in transcriptional regulation, its involvement during oocyte development remains poorly understood. In this study, we generated an oocyte-specific knockout of Ube2i, encoding the SUMO E2 enzyme UBE2I, using Zp3-cre+ to determine how loss of oocyte SUMOylation during folliculogenesis affects oocyte development. Ube2i Zp3-cre+ female knockout mice were sterile, with oocyte defects in meiotic competence, spindle architecture and chromosome alignment, and a premature arrest in metaphase I. Additionally, fully grown Ube2i Zp3-cre+ oocytes exhibited sustained transcriptional activity but downregulated maternal effect genes and prematurely activated genes and retrotransposons typically associated with zygotic genome activation. These findings demonstrate that UBE2I is required for the acquisition of key hallmarks of oocyte development during folliculogenesis, and highlight UBE2I as a previously unreported orchestrator of transcriptional regulation in mouse oocytes.
Keywords
Female, Animals, Mice, Chromatin Assembly and Disassembly, Sumoylation, Oocytes, Ovarian Follicle, Zygote, Mammals, SUMOylation, UBC9, Fertility, Germ cell
Published Open-Access
yes
Recommended Citation
Briley, Shawn M; Ahmed, Avery A; Steenwinkel, Tessa E; et al., "Global SUMOylation in Mouse Oocytes Maintains Oocyte Identity and Regulates Chromatin Remodeling and Transcriptional Silencing at the End of Folliculogenesis" (2023). Faculty and Staff Publications. 4369.
https://digitalcommons.library.tmc.edu/baylor_docs/4369