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Adenosine Deaminase-Like Gene-Carried Lentivirus Toolkit for Identification of DNA N6-Methyladenine Origins
Ziyu Liang1,2, Shaokun Chen1, Yao Li1,2
1The State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 10085, P. R. China.
Abstract:
Post-replicative DNA N6-methyladenine (pr6mdA) can form via bona fide methylase-catalyzed adenine methylation, playing a pivotal role in embryonic development and other biological processes. Surprisingly, pre-methylated adenine can be erroneously incorporated into DNA as misincorporated N6-methyladenine (i6mdA) via DNA polymerase-mediated replication. Despite pr6mdA and i6mdA sharing identical chemical structures, their biological functions diverge significantly, presenting a substantial challenge in distinguishing between the two. Here, for the first-time, it is exploited that the adenosine deaminase-like (Adal) protein and a corresponding activity-null mutant to construct an Adal lentivirus toolkit. With this newly designed toolkit, both pr6mdA and i6mdA can be identified and quantified simultaneously. The presence of 6mdA in the bone marrow cells of mice is shown, with its levels serving as indicators for growth with age, probably reflecting the cellular stress-caused changes in RNA decay, nucleotide pool sanitation, and transcription. Collectively, a powerful toolkit to advance understanding of both pr6mdA and i6mdA is demonstrated.
Insights
Researchers developed a new toolkit to distinguish between two forms of DNA methylation: post-replicative N6-methyladenine (pr6mdA) and misincorporated N6-methyladenine (i6mdA). This tool aids in understanding their distinct biological roles and levels in aging mouse bone marrow.
Area of Science:
- Molecular Biology
- Epigenetics
- Biochemistry
Background:
- Post-replicative N6-methyladenine (pr6mdA) is crucial for development, formed by methylase activity.
- Misincorporated N6-methyladenine (i6mdA) can arise from erroneous adenine incorporation during replication.
- Distinguishing between pr6mdA and i6mdA is challenging due to their identical chemical structures but divergent functions.
Purpose of the Study:
- To develop a novel method for simultaneously identifying and quantifying both pr6mdA and i6mdA.
- To investigate the presence and levels of 6-methyladenine in mouse bone marrow cells.
- To explore the potential correlation between 6-methyladenine levels and aging.
Main Methods:
- Construction of an adenosine deaminase-like (Adal) protein lentivirus toolkit, including an activity-null mutant.
- Utilizing the Adal toolkit for simultaneous detection and quantification of pr6mdA and i6mdA.
- Analysis of 6-methyladenine levels in bone marrow cells from mice of varying ages.
Main Results:
- A functional Adal lentivirus toolkit was successfully created for distinguishing pr6mdA and i6mdA.
- The toolkit enabled simultaneous identification and quantification of both DNA methylation forms.
- 6-methyladenine was detected in mouse bone marrow, with levels correlating to animal age.
Conclusions:
- The developed Adal lentivirus toolkit provides a powerful means to differentiate and measure pr6mdA and i6mdA.
- Age-related changes in 6-methyladenine levels in bone marrow may reflect cellular stress, impacting RNA decay, nucleotide pools, and transcription.
- This research advances the understanding of the distinct biological roles and implications of pr6mdA and i6mdA.
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