GO:0006396 RNA processing: Core Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006396 RNA processing describes any process that converts primary RNA transcripts into one or more mature RNA molecules.
• RNA processing includes capping, splicing, cleavage, polyadenylation, editing, and maturation of coding and non-coding RNAs.
• Deregulated RNA processing is increasingly recognized as a driver of leukemia and other cancers.
• Selective neuronal vulnerability to RNA processing deficits links this process to neurodegeneration.
• Mitochondrial RNA processing and tRNA processing are essential for organellar gene expression and cellular homeostasis.
• CRISPR knockout, point mutation, knock-in, and overexpression models enable causal dissection of RNA processing genes.
Description
RNA processing (GO:0006396) is the biological process that converts primary RNA transcripts into mature, functional RNA molecules. It encompasses a wide range of co- and post-transcriptional events, including 5-prime capping, splicing, 3-prime cleavage and polyadenylation, RNA editing, and the maturation of non-coding RNAs such as tRNA and ribosomal RNA. Because almost every eukaryotic gene depends on these steps, RNA processing sits at the center of gene expression and is essential for normal development and tissue homeostasis. Researchers study RNA processing to understand how transcriptomes are shaped, how mutations in processing factors cause disease, and how these pathways can be therapeutically targeted. The field has expanded from early biochemical descriptions of splicing and polyadenylation to genome-wide and structural analyses of processing machines. Recent work highlights RNA processing as a reprogrammable and druggable axis in cancer and other disorders. This article summarizes the definition, mechanism, key genes, disease links, and experimental methods for GO:0006396, with a focus on how CRISPR-based models can be used to interrogate this process.
RNA processing At A Glance
| GO ID | GO:0006396 |
|---|---|
| GO term | RNA processing |
| Ontology | biological_process |
| Synonym | None listed in QuickGO |
| Major function | Conversion of primary RNA transcripts into mature RNA molecules |
| Example RNA classes | mRNA, tRNA, rRNA, and other non-coding RNAs |
| Key molecular events | Capping, splicing, cleavage, polyadenylation, editing, and maturation |
| Disease relevance | Leukemia, neurodegeneration, mitochondrial disorders, and ribosomopathies |
| Research methods | RNA-seq, Ribo-seq, proteomics, imaging, and CRISPR screens |
What Is GO:0006396?
GO:0006396 RNA processing is defined as any process involved in the conversion of one or more primary RNA transcripts into one or more mature RNA molecules. In practice, this includes the enzymatic and structural steps that trim, modify, splice, cap, and polyadenylate precursor RNAs so they become functional. It applies to messenger RNAs as well as non-coding RNAs such as transfer RNAs and ribosomal RNAs. The term is a biological process and is distinct from transcription itself, although the two are tightly coupled in cells.
Why Is RNA processing Important in Cell Biology?
RNA processing is essential because it determines the sequence, stability, localization, and translational output of nearly every RNA in the cell. Defects in RNA processing factors cause or contribute to a broad spectrum of human diseases, including leukemias, neurodevelopmental and neurodegenerative disorders, and mitochondrial disease. Because processing steps are often rate-limiting and highly regulated, they provide attractive nodes for therapeutic intervention and for understanding how transcriptomes are reprogrammed in disease.
• RNA processing shapes the mature transcriptome by removing introns, adding caps and tails, and editing bases.
• Deregulated RNA processing is a recurrent theme in leukemia and other cancers.
• Selective neuronal vulnerability to RNA processing deficits connects this process to neurodegeneration.
• Mitochondrial RNA processing is required for oxidative phosphorylation and organellar gene expression.
• tRNA processing defects cause neurological and multi-system disease.
• RNA processing factors are emerging therapeutic targets in oncology and beyond.
• Retroviral RNA processing provides a model for understanding host and viral RNA maturation.
• RNA processing is coupled to transcription and chromatin state, influencing gene regulation.
• CRISPR screens can identify RNA processing dependencies in cancer and stem cells.
• Understanding RNA processing informs RNA therapeutics and biomarker development.
What Happens During RNA processing?
Transcription-coupled RNA processing
In simple terms: RNA processing starts while the RNA is still being made.
RNA processing is tightly coupled to transcription, with capping, splicing, and polyadenylation occurring co-transcriptionally on nascent transcripts. This coupling ensures that primary transcripts are converted into mature RNAs efficiently and in the correct order. Structural and mechanistic studies have revealed how transcription and RNA processing machineries communicate.
5-prime capping and 3-prime end formation
In simple terms: The ends of the RNA are modified to protect it and help it function.
The 5-prime end of nascent transcripts is modified by addition of a cap, while the 3-prime end is generated by cleavage and polyadenylation. These modifications are essential for RNA stability, nuclear export, and translation. Early biochemical work established the basic steps of capping and polyadenylation as core RNA processing events.
Splicing and intron removal
In simple terms: Non-coding pieces are cut out and the remaining pieces are joined.
Splicing removes introns and ligates exons to produce mature mRNA. This step is catalyzed by the spliceosome and is regulated by cis-elements and trans-acting factors. Alternative splicing expands proteome diversity and is a major source of transcriptome complexity.
RNA editing and modification
In simple terms: Some RNA letters are chemically changed after transcription.
RNA editing and chemical modifications alter the information content or stability of RNAs. Mitochondrial RNA processing includes modifications that are required for organellar translation and function. tRNA processing involves extensive trimming and modification to produce mature tRNAs.
Maturation of non-coding RNAs
In simple terms: Non-coding RNAs also need to be trimmed and folded into their working form.
Non-coding RNAs such as tRNA and rRNA undergo processing steps that remove leader and trailer sequences and add or modify nucleotides. Defects in these maturation pathways impair protein synthesis and cause disease. Retroviral RNA processing also depends on host and viral factors that generate mature viral RNAs.
Key Genes Involved in GO:0006396 RNA processing
The following genes and proteins represent major factors and regulators involved in RNA processing (GO:0006396) and are commonly studied in this pathway.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SF3B1 | Spliceosome component | Recurrently mutated in leukemia and other cancers |
| U2AF1 | Splicing factor | Mutated in myeloid malignancies |
| SRSF2 | Serine/arginine-rich splicing factor | Mutated in leukemia and linked to splicing deregulation |
| HNRNPA1 | RNA-binding protein | Implicated in RNA processing and neurodegeneration |
| FUS | RNA-binding protein | Linked to RNA processing defects in neurodegeneration |
| TARDBP | RNA-binding protein | Associated with RNA processing dysfunction in neurodegeneration |
| POLRMT | Mitochondrial RNA polymerase | Required for mitochondrial RNA processing |
| ELAC2 | Mitochondrial RNase | tRNA processing and mitochondrial disease |
| TRMT10C | tRNA methyltransferase | Mitochondrial RNA processing and modification |
| DICER1 | Ribonuclease | Non-coding RNA processing and disease |
| DROSHA | Ribonuclease | MicroRNA processing and cancer |
| CPSF | Cleavage and polyadenylation factor | 3-prime end formation |
| CSTF | Cleavage stimulation factor | 3-prime end processing |
| PRPF8 | Spliceosome component | Splicing and disease models |
| DDX3X | RNA helicase | RNA processing and cancer |
| NSUN2 | RNA methyltransferase | tRNA modification and processing |
| METTL3 | RNA methyltransferase | RNA modification and processing |
How Is RNA processing Regulated?
RNA processing is regulated at multiple levels, including transcription-coupled recruitment of processing factors, post-translational modification of splicing and polyadenylation machinery, and signaling pathways that respond to cellular stress. Cancer-associated mutations in splicing factors reprogram splicing patterns and create dependencies on specific processing steps. Neuronal RNA processing is regulated in a cell-type-specific manner, contributing to selective vulnerability in neurodegenerative disease. Mitochondrial RNA processing is controlled by nuclear-encoded factors that are imported into mitochondria.
RNA processing and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SF3B1 | Leukemia and splicing deregulation | Knockout and point-mutation cell models |
| U2AF1 | Myeloid malignancies | Knock-in of recurrent mutations |
| FUS | Neurodegeneration and RNA processing defects | Knockout and overexpression neuronal models |
| ELAC2 | Mitochondrial RNA processing disease | Knockout and rescue models |
| NSUN2 | tRNA modification and processing disease | Knockout and point-mutation models |
RNA processing in leukemia and cancer
Deregulated RNA processing is a hallmark of many leukemias, with recurrent mutations in splicing factors such as SF3B1, U2AF1, and SRSF2. These mutations alter splicing patterns and create therapeutic vulnerabilities that can be targeted with splicing modulators. RNA processing reprogramming is emerging as a broader theme in cancer biology.
RNA processing in neurodegeneration
Selective neuronal vulnerability to deficits in RNA processing is observed in neurodegenerative diseases, where RNA-binding proteins such as FUS, TARDBP, and HNRNPA1 are frequently involved. Disruption of RNA processing contributes to neuronal dysfunction and degeneration.
Mitochondrial RNA processing disorders
Human mitochondrial RNA processing and modifications are essential for organellar gene expression, and defects cause mitochondrial disease. Key factors include POLRMT, ELAC2, and TRMT10C.
tRNA processing and disease
Transfer RNA processing defects cause neurological and multi-system disorders, reflecting the essential role of tRNA maturation in translation. Structural and disease perspectives on tRNA processing have clarified how mutations impair this pathway.
From RNA processing-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a splicing factor essential for cell viability? | CRISPR knockout cell model |
| Does a recurrent mutation alter splicing patterns? | Point-mutation knock-in model |
| Can a wild-type processing factor rescue a defect? | Knock-in or overexpression model |
| Where does a processing factor localize? | Tagged knock-in model |
| Which RNA processing genes are dependencies in cancer? | CRISPR library screening |
| How does RNA processing change in neurons? | Neuronal differentiation models |
How to Study the RNA processing Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | RNA levels and splicing patterns | Transcriptome-wide processing analysis |
| Ribo-seq | Ribosome occupancy and translation | Linking processing to translation |
| Proteomics | Protein composition and interactions | Defining processing complexes |
| CRISPR screens | Gene dependencies | Identifying RNA processing vulnerabilities |
| Imaging | Localization and dynamics | Visualizing processing factors |
| Structural biology | Molecular architecture | Mechanistic studies of processing machines |
| Mitochondrial RNA analysis | Organellar RNA processing | Mitochondrial disease research |
| tRNA sequencing | tRNA maturation and modification | tRNA processing studies |
RNA-seq and transcriptome analysis
RNA-seq measures steady-state RNA levels and splicing patterns, enabling detection of RNA processing changes. It is widely used to profile splicing alterations in cancer and other diseases.
Ribo-seq and translation profiling
Ribo-seq measures ribosome occupancy and translation efficiency, linking RNA processing to protein output. It can reveal how processing defects affect translation.
Proteomics and interactomics
Proteomic approaches identify RNA processing complexes and their dynamic interactions. They help define the composition of splicing and polyadenylation machineries.
Imaging and structural biology
Imaging and structural studies visualize RNA processing factors and their assembly. They provide mechanistic insight into how processing machines recognize substrates.
How CRISPR Can Be Used to Study GO:0006396 RNA processing
Knockout
CRISPR knockout of RNA processing genes can reveal essential functions and identify dependencies in cancer and stem cells. Knockout models are used to study loss-of-function phenotypes and compensatory pathways.
Point Mutation
Point-mutation knock-in models recapitulate recurrent disease-associated mutations in splicing factors and other processing genes. These models help distinguish gain-of-function from loss-of-function effects.
Knock-in
Knock-in of tags or reporters enables visualization and biochemical purification of RNA processing factors. Knock-in can also be used to express wild-type or mutant alleles at endogenous loci.
Overexpression
Overexpression models are used to test whether increased levels of a processing factor are sufficient to drive phenotypes. They complement knockout and knock-in approaches.
How EDITGENE Supports RNA processing Research
Researchers studying RNA processing-related genes often need to determine whether a candidate gene is causally involved in a phenotype, how a specific mutation affects RNA maturation, and which processing pathways are dependencies in disease. EDITGENE provides CRISPR-based cell models and screening services to address these questions with rigor and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for RNA processing research.
Frequently Asked Questions About RNA processing
What is GO:0006396 RNA processing?
GO:0006396 RNA processing is the biological process that converts primary RNA transcripts into mature RNA molecules, including capping, splicing, cleavage, polyadenylation, and editing.
What genes are involved in RNA processing?
Key genes include SF3B1, U2AF1, SRSF2, HNRNPA1, FUS, TARDBP, POLRMT, ELAC2, TRMT10C, DICER1, DROSHA, CPSF, CSTF, PRPF8, DDX3X, NSUN2, and METTL3.
Why is RNA processing important?
RNA processing determines the sequence, stability, and translational output of RNAs and is essential for normal development and tissue homeostasis.
How is RNA processing linked to leukemia?
Recurrent mutations in splicing factors such as SF3B1, U2AF1, and SRSF2 deregulate RNA processing and contribute to leukemia.
Can RNA processing be targeted therapeutically?
Yes, RNA processing is emerging as a therapeutic landscape, with splicing modulators and other approaches under investigation.
What methods are used to study RNA processing?
Common methods include RNA-seq, Ribo-seq, proteomics, imaging, structural biology, and CRISPR screens.
What is the role of mitochondrial RNA processing?
Mitochondrial RNA processing and modifications are required for organellar gene expression and are linked to mitochondrial disease.
How does tRNA processing relate to disease?
Defects in tRNA processing cause neurological and multi-system disorders by impairing translation.
What CRISPR models are used for RNA processing research?
Knockout, point-mutation knock-in, tagged knock-in, overexpression, and CRISPR library screening models are widely used.
Is RNA processing involved in neurodegeneration?
Yes, selective neuronal vulnerability to RNA processing deficits is observed in neurodegenerative diseases.
Conclusion
GO:0006396 RNA processing is a central biological process that converts primary transcripts into mature RNAs through capping, splicing, cleavage, polyadenylation, editing, and non-coding RNA maturation. Its dysfunction is linked to leukemia, neurodegeneration, mitochondrial disease, and tRNA processing disorders. CRISPR-based models and screening approaches provide powerful tools to dissect the causal roles of RNA processing genes and to identify therapeutic opportunities.
References
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- 2. Passmore LA et al.. 2024. Mechanisms of transcription and RNA processing.. Nat Struct Mol Biol 31(5):730-731 PMID: 38744993
- 3. Neil CR et al.. 2022. Reprogramming RNA processing: an emerging therapeutic landscape.. Trends Pharmacol Sci 43(5):437-454 PMID: 35331569
- 4. Jedynak-Slyvka M et al.. 2021. Human Mitochondrial RNA Processing and Modifications: Overview.. Int J Mol Sci 22(15) PMID: 34360765
- 5. Azuma M et al.. 2025. [Deregulated RNA processing in leukemias].. Rinsho Ketsueki 66(9):897-905 PMID: 41034083
- 6. Zuniga G et al.. 2023. Selective neuronal vulnerability to deficits in RNA processing.. Prog Neurobiol 229:102500 PMID: 37454791
- 7. Sekulovski S et al.. 2022. Transfer RNA processing - from a structural and disease perspective.. Biol Chem 403(8-9):749-763 PMID: 35728022
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