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Isolation and characterization of the human Cdc2L1 gene promoter
Amber Kahle1, Yongmei Feng, Mark A Nelson
1Department of Pathology, Room 5208, Arizona Cancer Center, University of Arizona, 1501 N. Campbell Avenue, Tucson, AZ 85724, United States.
Abstract:
CDK11 (cyclin-dependent kinase 11, formerly known as PITSLRE) is a member of the p34cdc2-related kinases. It has been previously shown to be involved in a variety of different cellular processes including RNA processing, apoptosis, and cell cycle progression. It is encoded by two different but highly similar genes, Cdc2L1 (cell division control 2 like 1) and Cdc2L2 (cell division control 2 like 2). Previous studies from our group identified and characterized the transcriptional regulation of the human Cdc2L2 gene promoter. The current studies identify and characterize the Cdc2L1 gene promoter. We cloned the promoter and elucidated the different transcriptional regulatory elements that reside within the 5' region of the gene. Deletion analysis of the promoter showed a region of nucleotides -152 to +11 to be necessary for basal transcription of the Cdc2L1 gene. Sequencing analysis found this region of the promoter to be highly GC-rich but is lacking both TATA and CAAT boxes. There are several different transcription factor binding sites that are consensus or near consensus found within this region. The potential binding sites include two Ets-1 sites, one Skn-1 site, and one E2F-1 site. Transfection studies of various site-directed mutagenesis clones for these different sites revealed that both Ets-1 sites play critical roles in sustained transcriptional activity as well as Skn-1. Chromatin immunoprecipitation of the endogenous promoter with Ets-1 and Skn-1 verified an in vivo association of Ets-1 and Skn-1 transcription factors with the endogenous promoter. These results, in addition to our Cdc2L2 results, lead to the further comprehension of the fundamental mechanisms dictating CDK11 gene expression through the Cdc2L1 gene promoter.
Insights
This study characterizes the Cdc2L1 gene promoter, revealing key regulatory elements like Ets-1 and Skn-1 binding sites essential for cyclin-dependent kinase 11 (CDK11) gene expression.
Area of Science:
- Molecular Biology
- Gene Regulation
- Biochemistry
Background:
- Cyclin-dependent kinase 11 (CDK11), also known as PITSLRE, is involved in crucial cellular processes.
- CDK11 is encoded by two genes, Cdc2L1 and Cdc2L2, with prior research focusing on Cdc2L2 promoter regulation.
Purpose of the Study:
- To identify and characterize the transcriptional regulatory elements of the human Cdc2L1 gene promoter.
- To elucidate the specific transcription factors that bind to and regulate Cdc2L1 gene expression.
Main Methods:
- Cloning and deletion analysis of the Cdc2L1 promoter region.
- Sequencing to identify GC-rich regions and transcription factor binding sites.
- Site-directed mutagenesis, transfection studies, and chromatin immunoprecipitation (ChIP) assays.
Main Results:
- A core promoter region (-152 to +11) essential for basal Cdc2L1 transcription was identified.
- This region is GC-rich and lacks TATA/CAAT boxes but contains binding sites for Ets-1, Skn-1, and E2F-1.
- Ets-1 and Skn-1 binding sites were found to be critical for transcriptional activity, with in vivo association confirmed by ChIP.
Conclusions:
- The study elucidates the transcriptional regulation of the Cdc2L1 gene promoter.
- Identified Ets-1 and Skn-1 as key transcription factors driving CDK11 expression via the Cdc2L1 promoter.
- Provides a deeper understanding of the fundamental mechanisms governing CDK11 gene expression.
