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Transcriptomic Analysis of Plac1 Ablation Reveals Broad Alterations in Signaling Pathways Essential for Prenatal
Suzanne Jackman1, Xiaoyuan Kong1, Yulan Piao2
1Department of Pediatrics, University of South Florida, Morsani College of Medicine, Tampa, FL.
Insights
Placental gene Plac1 is crucial for embryonic development. Its absence disrupts placental signaling, leading to cellular stress, immune activation, and increased risks for preeclampsia and fetal growth restriction.
Area of Science:
- Developmental biology
- Genetics
- Reproductive medicine
Background:
- The X-linked gene Plac1 is vital for placental and embryonic development.
- Understanding Plac1's regulatory role is key to deciphering placental dysfunction.
Purpose of the Study:
- To investigate Plac1-regulated gene expression in a mouse model.
- To identify molecular pathways affected by Plac1 deficiency.
Main Methods:
- Utilized a Plac1 knockout (KO) mouse model.
- Performed gene expression microarray analysis at embryonic day (E) 16.5 and E18.5.
- Applied Gene Ontology (GO), KEGG, and Ingenuity Pathway Analysis (IPA) for data interpretation.
Main Results:
- Plac1 deficiency significantly altered gene expression, with thousands of genes downregulated and upregulated at E16.5 and E18.5.
- Downregulated genes were enriched in Rho GTPase and actin cytoskeleton signaling pathways crucial for trophoblast development and vasculogenesis.
- Upregulated genes indicated immune activation and oxidative stress responses, alongside a developing preeclampsia signature.
Conclusions:
- Plac1 is essential for maintaining placental structure and function through critical signaling pathways.
- Plac1 absence disrupts these pathways, causing cellular stress, immune responses, and contributing to adverse pregnancy outcomes like preeclampsia and fetal growth restriction.
- Findings align with the Developmental Origins of Health and Disease (DOHaD) framework, highlighting Plac1's impact on long-term health.
Abstract:
Plac1 is an X-linked gene essential for placental and embryonic development. A knockout (KO) mouse model was used to define placental gene expression changes associated with Plac1 loss at E16.5 and E18.5 using gene expression microarray. Genes exhibiting at least a 1.5-fold change and FDR < 0.05 were considered significant. At E16.5, 717 genes were downregulated and 796 upregulated in KO placentas relative to wild type (WT), whereas at E18.5, 1121 genes were downregulated and 1151 upregulated. Subsets of highly and uniquely dysregulated genes were examined by gene-level curation alongside systems-level analyses, Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG), and Ingenuity Pathway Analysis (IPA), applied to the full differentially expressed gene (DEG) datasets. Downregulated genes were enriched for Rho GTPase-mediated and actin cytoskeleton-based processes, as well as membrane-associated signaling pathways with established roles in placental and embryonic development, vascular function, and branching morphogenesis. Overlap with pathways and molecular features associated with preeclampsia was also observed. In contrast, upregulated genes reflected, in part, immune activation and oxidative stress responses. These findings represent an important exploratory, hypothesis-generating analysis and provide a biologically coherent framework for understanding how Plac1 loss may be associated with placental dysfunction and pregnancy-related disease.
