Identification of potential target genes of USP22 via ChIP-seq and RNA-seq analysis in HeLa cells

Area of Science:

• Molecular Biology
• Genetics
• Cancer Research

Background:

• Ubiquitin-specific protease 22 (USP22) is an oncogene with upregulated expression in various cancers.
• USP22 functions in the nucleus as part of the SAGA complex, regulating gene transcription.
• Genome-wide binding sites and direct target genes of USP22 remain unclear.

Purpose of the Study:

• To characterize the genomic binding sites of USP22 and GCN5.
• To identify direct target genes regulated by USP22.
• To elucidate USP22's role in gene expression, particularly in cervical cancer development.

Main Methods:

• Chromatin immunoprecipitation sequencing (ChIP-seq) was performed using specific antibodies for USP22 and GCN5 in HeLa cells.
• Motif analysis was conducted on sequences bound by USP22 and GCN5.
• Gene ontology (GO) and pathway analyses were applied to identify biological processes and pathways.
• RNA sequencing (RNA-seq) was used to analyze gene expression changes upon USP22 knockdown.
• Integration of ChIP-seq and RNA-seq data identified USP22 promoter-bound genes.

Main Results:

• 408 overlapping putative target genes were identified for both USP22 and GCN5.
• Two common motifs were found in sequences bound by USP22 and GCN5.
• Knockdown of USP22 led to differential expression of genes involved in various physiological processes, including metabolic processes.
• USP22 was found to bind to the promoters of 56 genes.

Conclusions:

• This study provides a comprehensive characterization of USP22 genomic binding sites and direct target genes.
• The findings offer new insights into USP22's regulatory role in gene expression.
• These results contribute to understanding USP22's involvement in cervical cancer development.