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The identification of Hoxc8 target genes
Haiyan Lei1, Hailong Wang, Aster H Juan
1Department of Molecular, Cellular, and Developmental Biology, Yale University, 266 Whitney Avenue, New Haven, CT 06511, USA.
Summary
Researchers identified new target genes controlled by the Hoxc8 transcription factor using microarray analysis. Osteopontin (OPN) was found to be directly regulated by Hoxc8, impacting cell processes.
Area of Science:
- Developmental Biology
- Gene Regulation
- Molecular Biology
Background:
- Hox genes are crucial transcription factors for embryonic development.
- Identifying downstream targets of Hox genes is challenging.
- Understanding Hoxc8 regulation provides insight into embryogenesis.
Purpose of the Study:
- To identify target genes regulated by the murine transcription factor Hoxc8.
- To investigate the impact of Hoxc8 overexpression on gene expression.
- To validate direct transcriptional targets of Hoxc8.
Main Methods:
- Overexpression of Hoxc8 in mouse embryo fibroblasts (MEF) in cell culture.
- Utilized a 16,463-gene oligonucleotide microarray to analyze mRNA expression changes.
- Performed chromatin immunoprecipitation (ChIP) assays to confirm protein-DNA interactions.
Main Results:
- Identified 34 genes with expression changes (≥2-fold) upon Hoxc8 overexpression.
- 16 genes were upregulated, and 18 genes were downregulated.
- Secreted phosphoprotein 1 (Spp1/osteopontin) was downregulated 4.8-fold, and Frizzled homolog 2 (Fzd2) was upregulated 4.4-fold.
- ChIP analysis confirmed direct binding of Hoxc8 to the OPN promoter.
Conclusions:
- Hoxc8 influences the expression of numerous genes involved in cell adhesion, migration, metabolism, apoptosis, and tumorigenesis.
- Osteopontin (OPN) is a direct transcriptional target of Hoxc8.
- These findings contribute to understanding the regulatory network of Hox genes in development.