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A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
Published on: June 25, 2014
Gene expression changes in pancreatic α-cell lines following knock-out Of either CK2α or CK2α'
Jens Mayer1, Mandy Pack2, Mathias Montenarh2
1Institute of Human Genetics, Saarland University, Bldg. 60, 66421, Homburg, Germany.
Background:
Protein kinase CK2 is known to exist as a tetramer of two catalytic α- or α'- subunits and two non-catalytic β-subunits, or as multimers of this tetramer. Moreover, CK2α (CSNK2A1) and CK2α' (CSNK2A2) are also active in the absence of CK2β (CSNK2B). Very little is known about specific functions of the individual subunits of protein kinase CK2.
Results:
In order to study the effects of CK2α and CK2α' on gene expression, we used the Mus musculus pancreatic α-cell line αTC1 and two derivatives with either CK2α (KO1 cells) or CK2α' (KO2 cells) expression knocked-out by CRISPR/Cas technology. We found numerous genes deregulated in both KO1 and KO2 cells compared to the parental cells. Applying stringent thresholds, 266 genes were found down-regulated and 153 genes up-regulated in KO1 cells, 233 genes were found down-regulated and 84 genes up-regulated in KO2 cells. Dozens of genes were found deregulated in a similar fashion in both KO1 and KO2 cells. We found altered expression of genes involved in the differentiation of pancreatic cells, including Hox genes, and in the regulation of glucagon synthesis or secretion. Moreover, many of the deregulated genes play an important role in developmental processes and in neuronal cell biology.
Conclusion:
Our findings reveal individual and shared functions of the CK2α and CK2α' catalytic subunits, in particular regarding their involvement in regulating gene expression.
Insights
Investigating protein kinase CK2 subunits revealed their distinct roles in gene regulation. Knocking out CK2α or CK2α
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Protein kinase CK2 (CK2) is a crucial enzyme involved in various cellular processes.
- CK2 is typically composed of two catalytic subunits (CK2α/CSNK2A1 and CK2α'/CSNK2A2) and two non-catalytic β-subunits (CK2β/CSNK2B).
- The specific functions of individual CK2 subunits, particularly the catalytic ones, remain largely uncharacterized.
Purpose of the Study:
- To elucidate the individual and shared roles of the CK2α and CK2α' catalytic subunits in regulating gene expression.
- To understand the impact of CK2α and CK2α' on the transcriptome of pancreatic α-cells.
Main Methods:
- Utilized CRISPR/Cas9 gene editing technology to generate knockout cell lines (KO1 for CK2α, KO2 for CK2α') from the mouse pancreatic α-cell line αTC1.
- Performed comprehensive gene expression profiling (RNA sequencing) to compare gene deregulation in KO1 and KO2 cells against parental αTC1 cells.
Main Results:
- Significant deregulation of numerous genes was observed in both CK2α and CK2α' knockout cells.
- In KO1 cells, 266 genes were downregulated and 153 genes were upregulated; in KO2 cells, 233 genes were downregulated and 84 genes were upregulated.
- Altered expression patterns affected genes involved in pancreatic cell differentiation (e.g., Hox genes), glucagon synthesis/secretion, developmental processes, and neuronal cell biology.
Conclusions:
- The study highlights distinct and overlapping functions of CK2α and CK2α' catalytic subunits in gene expression regulation.
- These findings provide novel insights into the specific roles of individual CK2 subunits in cellular processes and development.
