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Mapping of N6-methyladenosine residues in bovine prolactin mRNA
Abstract:
N6-Methyladenosine (m6A) residues, which are found internally in viral and cellular mRNA populations at the sequences Apm6ApC and Gpm6ApC, have been proposed to play a role in mRNA processing and transport. We have developed a sensitive approach to analyze the level and location of m6A in specific purified cellular mRNAs in an attempt to correlate m6A location with function. Polyadenylylated mRNA is hybridized to cDNA clones representing the full size mRNA under study or fragments of it, and the protected RNA is digested and labeled with polynucleotide kinase in vitro. After enrichment for m6A with anti-m6A antibody, the [32P]-pm6A is separated on TLC plates, and compared with the total amount of radiolabeled nucleotides. Using this combination of in vitro RNA labeling and antibody selection, we were able to detect m6A in purified stable mRNAs that cannot be readily labeled in cells with greater sensitivity than was possible by previous techniques. We applied this technique to bovine prolactin mRNA and showed that this mRNA contains m6A. Moreover, all of the m6A residues in this message are found within the 3' two-thirds of the molecule and are highly concentrated (61%) within a sequence of 108 nucleotides at the 3' noncoding region of the message. The nonrandom distribution of m6A in a specific cellular mRNA, as demonstrated for bovine prolactin, will have to be taken into account when designing a model for m6A function.
Insights
Researchers developed a sensitive method to detect N6-Methyladenosine (m6A) in mRNA. This technique revealed m6A is concentrated in the 3' noncoding region of bovine prolactin mRNA, suggesting a role in gene regulation.
Area of Science:
- Molecular Biology
- Epigenetics
- RNA Biology
Background:
- N6-Methyladenosine (m6A) is an internal modification in mRNA, implicated in RNA processing and transport.
- Previous techniques for m6A detection lacked sensitivity and specificity for cellular mRNA analysis.
Purpose of the Study:
- To develop a sensitive method for analyzing the level and location of m6A in specific purified cellular mRNAs.
- To correlate m6A location with its potential function in mRNA.
Main Methods:
- Hybridization of polyadenylylated mRNA to cDNA clones.
- Enzymatic digestion and in vitro labeling with polynucleotide kinase.
- Enrichment of m6A using anti-m6A antibody and separation via TLC.
Main Results:
- A sensitive method was established to detect m6A in purified stable mRNAs.
- Bovine prolactin mRNA was found to contain m6A residues.
- m6A residues were predominantly located in the 3' two-thirds of the mRNA, with 61% concentrated in a 108-nucleotide sequence of the 3' noncoding region.
Conclusions:
- The developed method offers enhanced sensitivity for m6A detection in specific mRNAs.
- The nonrandom distribution of m6A in bovine prolactin mRNA suggests a specific functional role.
- Future models of m6A function must consider its nonrandom localization within mRNA molecules.