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Analysis of pre-mRNA splicing using HeLa cell nuclear extracts
Cold Spring Harbor Protocols
|June 5, 2013
Summary
This protocol analyzes messenger RNA (mRNA) splicing in cell extracts. It uses radioactive labeling and gel electrophoresis to study how pre-mRNAs are processed.
Area of Science:
- Molecular Biology
- RNA Processing
- Biochemistry
Background:
- Pre-messenger RNA (pre-mRNA) undergoes splicing to form mature messenger RNA (mRNA).
- Splicing is a critical step in gene expression, occurring in the nucleus.
- Understanding splicing mechanisms requires robust experimental protocols.
Purpose of the Study:
- To describe a method for analyzing pre-mRNA splicing.
- To provide a protocol for investigating splicing dynamics in vitro.
- To enable the study of splicing intermediates and products.
Main Methods:
- Utilizing cell extracts (e.g., HeLa nuclear extracts) capable of splicing.
- Incubating 32P-labeled RNA under optimized splicing conditions.
- Analyzing splicing products via denaturing polyacrylamide gel electrophoresis.
Main Results:
- The protocol allows for the temporal analysis of splicing events.
- Radioactive labeling enables sensitive detection of RNA species.
- Gel electrophoresis separates and visualizes different splicing intermediates and products.
Conclusions:
- This protocol provides a reliable method for studying pre-mRNA splicing in vitro.
- It is applicable to various cell extracts and can reveal insights into splicing mechanisms.
- The technique facilitates the characterization of RNA splicing dynamics.
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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
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