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Xie, S.; , .; Zhou, T. m1A RNA Modification in Gene Expression Regulation. Encyclopedia. Available online: (accessed on 18 May 2024).
Xie S,  , Zhou T. m1A RNA Modification in Gene Expression Regulation. Encyclopedia. Available at: Accessed May 18, 2024.
Xie, Shanshan, , Tianhua Zhou. "m1A RNA Modification in Gene Expression Regulation" Encyclopedia, (accessed May 18, 2024).
Xie, S., , ., & Zhou, T. (2022, June 01). m1A RNA Modification in Gene Expression Regulation. In Encyclopedia.
Xie, Shanshan, et al. "m1A RNA Modification in Gene Expression Regulation." Encyclopedia. Web. 01 June, 2022.
m1A RNA Modification in Gene Expression Regulation

N1-methyladenosine (m1A) is a prevalent and reversible post-transcriptional RNA modification that decorates tRNA, rRNA and mRNA. Studies based on technical advances in analytical chemistry and high-throughput sequencing methods have revealed the crucial roles of m1A RNA modification in gene regulation and biological processes.

N1-methyladenosine(m1A) RNA modification gene expression

1. Introduction

Cellular RNAs contain more than 170 different types of chemical modifications across species [1]N1-methyladenosine(m1A) is a reversible methylation involving the addition of a methyl group at the N1 position of adenosine in cellular transcripts [2]. The methyl group can block the normal Watson–Crick base pairing of A:T or A:U, resulting in an unstable mismatch with other nucleosides by forming Hoogsteen base pairs [3]. The secondary structure and RNA–protein interaction of m1A-modified RNAs are also altered under physiological conditions [4]. As a dynamic and reversible post-transcriptional RNA modification, m1A can be installed by methyltransferases, removed by demethylases and recognized by m1A-dependent RNA-binding proteins [2][5]. m1A RNA modification affects RNA metabolism, including RNA structure, stability and mRNA translation, thereby regulating gene expression and several fundamental cellular processes [6].
m1A RNA modification has been found with high abundance in transfer RNAs (tRNAs) and ribosomal RNAs (rRNAs) but at low levels in messenger RNAs (mRNAs) [7][8][9][10][11][12]. It occurs in the tRNA of bacteria, archaea and eukaryotes at positions 9, 14, 16, 22, 57 and 58 (m1A9, m1A14, m1A16, m1A22, m1A57, and m1A58, respectively) [13]. In cytosolic (cyt) tRNAs, m1A RNA modification occurs at five different positions (9, 14, 22, 57, and 58) [14][15]. Among them, m1A14 has only been identified in cyt(tRNA)Phe from mammals, m1A22 has only been identified in bacteria tRNAs, and m1A57 has been identified in archaea existing only transiently as an intermediate of 1-methylinosine (m1I) [14][15]. In mitochondria, m1A9 is quite abundant and found in 14 species of mt-tRNA, while m1A58 is a minor modification with a 17% frequency found in four species of mt-tRNAs [16]. Additionally, m1A16 is unique to human mt-tRNAArg, and its frequency is approximately 20% [16]. For rRNAs, the nuclear-encoded large subunit rRNA m1A645 in 25S rRNA and m1A1322 in 28S rRNA located in the peptidyl transfer center of the ribosome are conserved in budding yeast and humans, respectively [17][18][19], and m1A is conserved at position 947 of 16S rRNA in the mitochondrial ribosome of vertebrates [20]. Regarding mRNAs, m1A in mRNA accounts for approximately 0.015–0.054% of all adenosines in mammalian cell lines and 0.05–0.16% in mammalian tissues [9][10][21]. m1A sites are usually located near the translation start site and the first splice site of mRNA, and they are associated with the translation of coding transcripts [9][10].

2. m1A RNA-Modifying Proteins

Reversible m1A methylomes in nuclear- and mitochondrial-encoded transcripts are achieved via the dynamic regulation of m1A RNA-modifying proteins (m1A methyltransferases, m1A demethylases and m1A-dependent RNA-binding proteins). The characterization of m1A-modifying proteins is crucial for understanding the mechanisms underlying m1A-mediated gene regulation and the biological roles of m1A RNA modification. To date, several m1A RNA-modifying proteins responsible for nuclear- and mitochondrial-encoded transcripts have been identified in humans (Figure 1).
Figure 1. m1A-modifying proteins for different types of RNAs. The nuclear-encoded (top panel) and mitochondrial (bottom panel) RNAs are reversibly methylated by m1A methyltransferases (blue; dark blue represents catalytic core of the methylase complex), demethylased by m1A demethylases (pink), and bound by m1A-dependent RNA-binding proteins (green). A, adenosine; m1A, N1-methyladenosine; TRMT, tRNA (adenine (58)-N (1))-methyltransferase subunit; ALKBH, α-ketoglutarate-dependent dioxygenase alkB homolog; FTO, α-ketoglutarate-dependent dioxygenase alkB homolog FTO; NML, nucleomethylin; YTHDF, YTH domain-containing family protein; YTHDC1, YTH domain-containing protein 1; SDR5C1, 3-hydroxyacyl-CoA dehydrogenase type-2.

3. Biological Functions of m1A RNA Modification

Since the discovery of m1A RNA modification as a chemical modification of RNAs, efforts have been taken to understand the functional characterization of this dynamic methylation in RNA metabolism and gene expression regulation.

3.1. m1A RNA Modification in RNA Metabolism

m1A RNA modification is a pivotal regulator of RNA metabolism, including RNA structure alteration, decay and translation (Figure 2).
Figure 2. Action mechanisms of m1A in RNA metabolism. m1A RNA modification regulates RNA metabolism in multiple layers (from top to bottom: (1) m1A RNA modification stabilizes tRNAs to promote translation initiation; (2) m1A-modified mRNAs interfere with Watson–Crick base-pairing with tRNA to suppress translation; (3) m1A-modified tRNAs are coupled with eEF1α to polysomes to promote translation elongation; (4) m1A-modified mRNAs are subjected to degradation by interacting with YTHDF2; (5) m1A-modified mRNAs become stable when they bind to YTHDF3). m1A, N1-methyladenosine; eEF1α, eukaryotic elongation factor 1-α; YTHDF, YTH domain-containing family protein.
The chemical properties of m1A RNA modification enable changes in RNA secondary structure. For instance, m1A9 and m1A58 in tRNAs are required for the conformational shift of mitochondrial tRNALys and tRNAiMet, respectively, which contribute to the stabilization of alternative native structures [22][23][24][25]. The loss of m1A645 has been shown to affect the topological structure of 28S rRNA and alter the RNA interactome [26]. m1A was also found to favor the hairpin structure of palindromic RNA sequences, wherein m1A can stably localize within apical loops [27]. A recent study revealed that m1A RNA modification controlled RNA conformational equilibrium by blocking base-pairing to modulate the RNA duplex [3].
The regulation of m1A-modified mRNA decay is mediated by m1A-dependent RNA-binding proteins. Limited evidence suggests that the knockdown of YTHDF2 increases the abundance of 7 out of 8 m1A-modified transcripts and 2 out of 3 transcripts that bear only the m1A but not m6A (N6-methyladenosine) modification [28]. In addition to YTHDF2, YTHDF3 overexpression has been reported to decrease the abundance and decay rate of insulin like growth factor 1 receptor (IGF1R) mRNA [29].
Translational regulation by m1A modification varies among different RNA types. The m1A demethylases ALKBH1 and FTO have been reported to control specific tRNA m1A demethylation and decrease translation initiation [30][31]. Eukaryotic elongation factor 1-α (eEF1α) immunoprecipitation was used to reveal that m1A-methylated tRNAs are enriched in polysomes, indicating the role of m1A RNA modification in translation activation [30]. During retroviral reverse transcription in early human immunodeficiency virus 1 (HIV-1) replication, TRMT6-mediated m1A58 of tRNA3Lys acted as a stop site that contributed to genome integration [32]. Further, mRNAs carrying m1A undergo translation repression because of interfered Watson–Crick base pairing [8][12][33].

3.2. m1A RNA Modification in Biological Processes

Post-transcriptional modifications are involved in various biological processes, and recent evidence showed the importance of m1A RNA modification in this field. In a high-temperature-sensitive Thermococcus kodakarensis strain, decreased m1A58 and melting temperature of tRNA were observed, suggesting the relevance of m1A58 and the growth ability of this strain at high temperatures [34]. m1A RNA modification was found to exhibit its protective ability of RNAs under stress conditions. During heat shock, m1A-harbouring transcripts were found to preferentially accumulate in stress granules, subsequently resulting in a shorter time to restore the translation state during recovery [35]. Alkylating agents induced m1A modification in RNAs and orchestrated translational suppression by recruiting the ASCC damage repair complex (activating signal cointegrator 1 complex) [36]. The tRNA modification profiles of the Aplysia central nervous system showed increased m1A RNA modification levels in animals after behavioral training [37]; this was the first study to characterize the variable pattern of m1A RNA modification during defensive reflex-associated behavioral sensitization. Petunia TRMT61A catalyzed m1A RNA modification in mRNAs, and the knockdown of TRMT61A decreased the chlorophyll content and changed chlorotic and wrinkled leaf phenotype [38]. A recent study showed that the m1A demethylase ALKBH3 functioned as a negative regulator of ciliogenesis by removing the m1A sites on Aurora A mRNA (a key regulator of cilia disassembly) in mammalian cells, which was further involved in cilia-associated developmental processes in zebrafish [39].

4. m1A RNA Modification in Diseases

The limited exploration of m1A RNA modification as a pathological feature has mainly focused on tumor progression (Table 1). It was reported that the knockdown of m1A demethylase ALKBH3 increased the abundance of m1A RNA modification in small RNAs (< 200 nucleotides) along with suppressed nascent protein in pancreatic cancer cells [40]. The ALKBH3-dependent m1A demethylation of macrophage colony-stimulating factor 1 (CSF1) mRNA enhanced its mRNA stability and thus promoted the invasion of breast and ovarian cancer cells [41]. In addition, ALKBH3 removed the m1A RNA modification of tRNAGlyGCC to promote tRNA cleavage by angiogenin. The generation of excessive tRNA-derived small RNAs may affect ribosome assembly and apoptosis in HeLa cells [42]. Furthermore, ALKBH3 promoter CpG island hypermethylation and transcriptional silencing were found in Hodgkin lymphoma cells, which were identified as a potential prognostic biomarker associated with poor clinical outcomes in patients with Hodgkin lymphoma [43]. A recent study found that levels of tRNA m1A modification were upregulated in hepatocellular carcinoma (HCC) tissues. The TRMT6/TRMT61A complex mediated increased m1A58 levels in tRNA, which then triggered peroxisome proliferator-activated receptor delta (PPARδ) mRNA translation in HCC stem cells. PPARδ promoted cholesterol biogenesis to activate the Hedgehog pathway, thereby initiating the self-renewal of HCC stem cells [44].
Table 1. Dysregulation of m1A RNA modification in human cancers.
Cancers m1A-Modifying Proteins Roles Targets Mechanisms Refs
Pancreatic cancer ALKBH3 Oncogene small RNAs Unknown [40]
Breast and ovarian cancer ALKBH3 Oncogene CSF1 mRNA decay [41]
Cervical cancer ALKBH3 Oncogene tRNAs tRNA cleavage [42]
Hodgkin lymphoma ALKBH3 Tumor
COL1A1, COL1A2 Unknown [43]
Hepatocellular carcinoma TRMT6/TRMT61A Oncogene tRNAs Unknown [44]
ALKBH, α-ketoglutarate-dependent dioxygenase alkB homolog; TRMT, tRNA (adenine(58)-N(1))-methyltransferase subunit; CSF-1, macrophage colony-stimulating factor 1; COL1A1, collagen α-1(I) chain; COL1A2, collagen α-2(I) chain.


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