GO:0005849 mRNA cleavage factor complex: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005849 (mRNA cleavage factor complex) describes any macromolecular complex that carries out cleavage or polyadenylation of mRNA molecules.
• The core cleavage and polyadenylation machinery in humans is an 8-subunit complex whose assembly is required to activate the endonuclease that defines mRNA 3' ends.
• Cleavage factor I (CF I) is essential for precise cleavage and polyadenylation site determination, as shown in plant systems.
• The Ysh1 endonuclease subunit is regulated by ubiquitin-mediated degradation, linking complex turnover to 3' end processing control.
• Pre-mRNA processing factors, including CF IB/Hrp1, coordinate co-transcriptional cleavage with transcription termination and surveillance of 3' mRNA cleavage [2,5].
• The cleavage and polyadenylation complex also participates in stress responses such as the hypertonic stress response and in telescripting through U1 snRNP interaction.
Description
The mRNA cleavage factor complex (GO:0005849) is defined as any macromolecular complex involved in cleavage or polyadenylation of mRNA molecules. This ontology term captures the multi-protein assemblies that recognize polyadenylation signals, cleave nascent transcripts, and add the poly(A) tail that confers stability and translational competence to eukaryotic mRNAs. Because nearly every protein-coding gene depends on precise 3' end formation, the composition and regulation of these complexes are central to gene expression research. The best-characterized example is the cleavage and polyadenylation factor (CPF) core, which in humans comprises eight subunits and becomes catalytically active only after correct assembly. Cleavage factor I (CF I) acts as an accessory factor that helps define exactly where cleavage occurs, a function demonstrated in plant systems where loss of CF I impairs precise cleavage and polyadenylation site determination. Beyond housekeeping 3' end processing, these complexes are integrated with transcription termination, RNA surveillance, and stress-responsive gene regulation [2,5,6]. This article summarizes the QuickGO definition, the subunit composition, the molecular mechanism, the key genes, disease links, and the experimental methods used to study GO:0005849.
mRNA cleavage factor complex At A Glance
| GO ID | GO:0005849 |
|---|---|
| GO term | mRNA cleavage factor complex |
| Ontology | cellular_component |
| Synonym | (none) |
| Major function | Cleavage and/or polyadenylation of mRNA molecules |
| Core example | 8-subunit cleavage and polyadenylation factor complex that activates the mRNA 3' end endonuclease |
| Accessory factor | Cleavage factor I (CF I), required for precise cleavage and polyadenylation site determination |
| Regulation | Ysh1 endonuclease subunit is controlled by ubiquitin-mediated degradation |
| Related processes | Transcription termination, 3' mRNA cleavage surveillance, telescripting, hypertonic stress response [2,5,6,7] |
What Is GO:0005849?
In plain terms, GO:0005849 describes the protein machines that cut an mRNA precursor and/or add its poly(A) tail. The QuickGO definition states that it is any macromolecular complex involved in cleavage or polyadenylation of mRNA molecules. This includes the core cleavage and polyadenylation factor (CPF) complex, cleavage factor I (CF I), cleavage factor II (CF II), and related assemblies that together recognize signals in the pre-mRNA, position the cleavage site, and catalyze endonucleolytic cleavage followed by poly(A) addition [1,4]. The term is a cellular_component term, so it is used to annotate where these reactions occur rather than a single enzymatic activity.
Why Is mRNA cleavage factor complex Important in Cell Biology?
GO:0005849 matters because 3' end formation is a required step in the biogenesis of almost every eukaryotic mRNA, and the complexes annotated to this term determine where an mRNA ends, how stable it is, and how efficiently it is translated. Disrupting the assembly or activity of these complexes changes polyadenylation site choice, which can alter transcript coding potential and gene expression programs [1,2]. Because the same factors also couple cleavage to transcription termination and to RNA surveillance, they sit at the intersection of transcription, RNA processing, and RNA quality control [2,5]. Their roles in stress responses and in cell-cycle control further broaden their physiological relevance [3,6].
• Defines the 3' ends of most protein-coding mRNAs, a prerequisite for stable, translatable transcripts.
• Controls alternative polyadenylation site choice, which can change mRNA coding capacity and regulation.
• Couples pre-mRNA cleavage to transcription termination, helping to prevent read-through transcription.
• Participates in surveillance of 3' mRNA cleavage through factors such as CF IB/Hrp1.
• Contributes to the hypertonic stress response by regulating 3' end processing.
• Interacts with U1 snRNP to control telescripting and protect nascent transcripts from premature cleavage.
• Is regulated by ubiquitin-mediated degradation of the Ysh1 endonuclease, linking complex stability to processing activity.
• Impacts cell-cycle progression, as 3' end processing factors influence cyclin B1 translation control in oocytes.
• Provides a mechanistic explanation for how mutations in processing factors can rewire gene expression in disease.
• Offers tractable targets for CRISPR knockout and point-mutation studies of RNA processing [4,8].
What Happens During mRNA cleavage factor complex?
Recognition of polyadenylation signals
In simple terms: The complex first reads short sequence signals in the mRNA to know where to cut.
Cleavage and polyadenylation factors assemble on pre-mRNA in a signal-dependent manner, recognizing sequence elements that define the future 3' end. In plants, the Cleavage Factor I complex is essential for precise cleavage and polyadenylation site determination, indicating that accessory factors contribute to signal recognition and site selection. In human cells, pre-mRNA processing factors differentially impact the coordination between co-transcriptional cleavage and transcription termination, showing that signal recognition is coupled to ongoing transcription.
Assembly of the core cleavage and polyadenylation factor
In simple terms: Multiple proteins must come together in the right order to build an active cutting machine.
Activation of the endonuclease that defines mRNA 3' ends requires incorporation into an 8-subunit core cleavage and polyadenylation factor complex, meaning that catalysis is strictly dependent on correct assembly rather than on the isolated enzyme. This assembly step is a checkpoint: incomplete or misassembled complexes fail to cleave efficiently.
Endonucleolytic cleavage of the pre-mRNA
In simple terms: Once assembled, the complex cuts the RNA at the chosen site.
The catalytic step is performed by an endonuclease subunit within the complex, and its activity is licensed by incorporation into the 8-subunit core. Surveillance of 3' mRNA cleavage during transcription termination requires CF IB/Hrp1, indicating that cleavage is monitored and coordinated with termination. Regulation of the Ysh1 endonuclease by ubiquitin-mediated degradation provides an additional layer of control over when cleavage occurs.
Poly(A) addition and coupling to termination
In simple terms: After cutting, a poly(A) tail is added and the transcription machinery is told to stop.
Following cleavage, polyadenylation completes 3' end formation, and this step is functionally coupled to transcription termination. Pre-mRNA processing factors differentially impact coordination between co-transcriptional cleavage and transcription termination, demonstrating that the complex communicates with the elongating RNA polymerase. The interaction of U1 snRNP with cleavage and polyadenylation factors controls telescripting, further linking 3' end processing to transcription regulation in human cells.
Stress-responsive and cell-cycle-linked regulation
In simple terms: The same machinery is reused to respond to stress and to control cell division.
The 3' mRNA cleavage and polyadenylation complex regulates the hypertonic stress response, showing that its activity is modulated by environmental conditions. In mouse oocytes, two mechanisms repress cyclin B1 translation to maintain prophase arrest, implicating 3' end processing factors in cell-cycle control. Together these findings indicate that GO:0005849 complexes are not static housekeeping machines but dynamic regulators of gene expression [3,6].
Key Genes Involved in GO:0005849 mRNA cleavage factor complex
The genes below encode subunits and accessory factors of the mRNA cleavage factor complex (GO:0005849) and its associated cleavage and polyadenylation machinery.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CPSF1 | Core subunit of the cleavage and polyadenylation factor complex | Required for assembly of the active 8-subunit complex |
| CPSF2 | Core subunit of the cleavage and polyadenylation factor complex | Contributes to endonuclease activation and 3' end formation |
| CPSF3 | Endonuclease subunit that cleaves mRNA 3' ends | Catalytic center activated only upon complex assembly |
| CPSF4 | Core subunit of the cleavage and polyadenylation factor complex | Supports complex integrity and cleavage activity |
| FIP1L1 | Core subunit linking poly(A) polymerase to the complex | Important for polyadenylation and complex assembly |
| WDR33 | Core subunit involved in polyadenylation signal recognition | Required for assembly of the active complex |
| CSTF1 | Cleavage stimulation factor subunit | Functions in cleavage and polyadenylation site selection |
| CSTF2 | Cleavage stimulation factor subunit | Impacts coordination of cleavage with transcription termination |
| CFI subunits (e.g., CPSF6/CF I components) | Accessory cleavage factor I complex | Essential for precise cleavage and polyadenylation site determination |
| CF IB/Hrp1 | Surveillance factor for 3' mRNA cleavage | Required for surveillance of 3' mRNA cleavage during termination |
| Ysh1 | Endonuclease subunit of the cleavage/polyadenylation complex | Regulated by ubiquitin-mediated degradation |
| U1 snRNP components | Interact with cleavage and polyadenylation factors | Control telescripting and transcription regulation |
| Cyclin B1 (CCNB1) | Cell-cycle regulator whose translation is controlled by 3' end processing | Links cleavage factor function to oocyte prophase arrest |
| Hypertonic stress response genes | Targets of 3' end processing regulation | Used to study stress-dependent polyadenylation |
| Pre-mRNA processing factors (general) | Couple co-transcriptional cleavage to termination | Differentially impact transcription termination coordination |
How Is mRNA cleavage factor complex Regulated?
The activity of the mRNA cleavage factor complex is regulated at multiple levels. Assembly of the 8-subunit core is itself a regulatory checkpoint, because the endonuclease that defines mRNA 3' ends is active only after incorporation into the complex. The Ysh1 endonuclease subunit is controlled by ubiquitin-mediated degradation, providing a turnover mechanism that can rapidly modulate cleavage activity. Surveillance factors such as CF IB/Hrp1 monitor 3' mRNA cleavage during transcription termination, ensuring that processing is coordinated with transcription. Environmental conditions also regulate the complex, as shown by its role in the hypertonic stress response. In addition, interaction with U1 snRNP controls telescripting, linking 3' end processing to transcription elongation and transcript protection.
mRNA cleavage factor complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CPSF3 | Dysregulated mRNA 3' end formation | Knockout and point-mutation cell lines to test endonuclease activation |
| Ysh1 | Altered cleavage activity via protein turnover | Tagged knock-in for degradation studies |
| CF I subunits | Imprecise polyadenylation site choice | Knockout plant or human cell models |
| CF IB/Hrp1 | Defective 3' cleavage surveillance | Knockout followed by RNA-seq and termination assays |
| CCNB1 (via 3' processing) | Oocyte prophase arrest and cell-cycle control | Oocyte-specific knockout or overexpression models |
Cancer and dysregulated gene expression
Because cleavage and polyadenylation factors determine mRNA 3' ends and alternative polyadenylation site choice, their dysregulation can reshape transcriptomes in ways that affect cell proliferation and survival [1,2]. Pre-mRNA processing factors differentially impact coordination between co-transcriptional cleavage and transcription termination, and disruption of this coordination can alter gene expression programs relevant to cancer biology. The 8-subunit core complex is required for endonuclease activation, so mutations that impair assembly could broadly affect oncogene and tumor suppressor transcripts.
Cell-cycle and oocyte maturation disorders
Two mechanisms repress cyclin B1 translation to maintain prophase arrest in mouse oocytes, and 3' end processing factors participate in this translational control. This links the mRNA cleavage factor complex to meiotic regulation and, by extension, to fertility-related biology.
Stress-response and metabolic stress conditions
The 3' mRNA cleavage and polyadenylation complex regulates the hypertonic stress response, indicating that its dysfunction could impair cellular adaptation to osmotic stress. Surveillance of 3' mRNA cleavage by CF IB/Hrp1 further suggests that defects in quality control may contribute to stress sensitivity.
Neurological and developmental implications
Telescripting, controlled by a complex of U1 snRNP with cleavage and polyadenylation factors, regulates mRNA transcription in human cells and helps prevent premature cleavage of nascent transcripts. Perturbation of this mechanism has been proposed to affect neuronal gene expression, although direct disease causation requires further experimental validation.
From mRNA cleavage factor complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is the endonuclease subunit essential for mRNA 3' end formation? | CRISPR knockout of CPSF3 or Ysh1 in human cell lines [4,8] |
| Does a point mutation in a core subunit impair complex assembly? | Point-mutation knock-in of CPSF1/CPSF2 residues |
| Where does a subunit localize within the complex? | Tagged knock-in with fluorescent or affinity tags |
| Does overexpression of CF I change polyadenylation site choice? | Overexpression cell models with RNA-seq readout |
| How does loss of CF IB/Hrp1 affect transcription termination? | Knockout followed by termination and surveillance assays |
| Does 3' end processing regulate stress-responsive transcripts? | Knockout or knockdown under hypertonic stress |
How to Study the mRNA cleavage factor complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcript abundance and polyadenylation site usage | Assessing effects of cleavage factor perturbation [1,2] |
| 3' end sequencing | Precise cleavage and polyadenylation sites | Testing CF I-dependent site determination |
| Affinity purification-mass spectrometry | Subunit composition and assembly | Defining the 8-subunit core complex |
| Ubiquitin turnover assays | Degradation of complex subunits | Studying Ysh1 regulation |
| Transcription termination assays | Co-transcriptional cleavage and termination | Testing pre-mRNA processing factor function |
| Surveillance reporter assays | Monitoring of 3' mRNA cleavage | Evaluating CF IB/Hrp1 activity |
| Fluorescent tagging and imaging | Subunit localization and dynamics | Live-cell studies of complex assembly |
| Translational reporters | Translation of specific mRNAs | Analyzing cyclin B1 repression in oocytes |
RNA-seq and 3' end sequencing
RNA-seq and specialized 3' end sequencing methods measure polyadenylation site usage and transcript abundance, allowing researchers to determine whether perturbation of GO:0005849 components changes cleavage site choice [1,2]. These approaches are typically applied after knockout or knockdown of core subunits such as CPSF3 or accessory factors such as CF I [1,4].
Proteomics and complex purification
Affinity purification coupled to mass spectrometry identifies subunit composition and assembly intermediates of the cleavage and polyadenylation factor complex, which is necessary because endonuclease activation requires incorporation into an 8-subunit core. Proteomic turnover studies can also reveal ubiquitin-mediated degradation of subunits such as Ysh1.
Transcription termination and surveillance assays
Termination assays and surveillance readouts detect defects in co-transcriptional cleavage and in the monitoring of 3' mRNA cleavage, which are functions linked to pre-mRNA processing factors and CF IB/Hrp1 [2,5]. These methods are used to test whether a candidate factor couples cleavage to transcription termination [2,5].
Imaging and translational reporters
Fluorescent reporters and imaging can monitor the localization of tagged subunits and the translation of specific mRNAs, such as cyclin B1, whose translation is repressed to maintain prophase arrest in oocytes. Tagged knock-in models enable live-cell tracking of complex assembly and dynamics.
How CRISPR Can Be Used to Study GO:0005849 mRNA cleavage factor complex
Knockout
CRISPR knockout of core subunits such as CPSF3 or accessory factors such as CF I components can test whether they are essential for mRNA 3' end formation and for precise cleavage site determination [1,4]. Knockout of CF IB/Hrp1 is used to probe surveillance of 3' mRNA cleavage during transcription termination. Knockout of Ysh1-related factors can reveal how loss of the endonuclease affects transcript stability.
Point Mutation
Point-mutation knock-in can be used to dissect catalytic residues of the endonuclease or interfaces required for assembly of the 8-subunit core complex. Such models help distinguish between loss of catalytic activity and loss of complex integrity, which is important because activation of the endonuclease requires incorporation into the complex.
Knock-in
Tagged knock-in of subunits enables affinity purification and imaging of the mRNA cleavage factor complex in its native context. Knock-in of degradation tags can be used to study regulated turnover of subunits such as Ysh1. These models are valuable for defining assembly intermediates and dynamic interactions.
Overexpression
Overexpression of cleavage factor subunits or accessory factors such as CF I can be used to test whether increased dosage alters polyadenylation site choice and transcript output. Overexpression models are also useful for studying stress-responsive regulation of the complex and for testing dominant effects of mutant subunits.
How EDITGENE Supports mRNA cleavage factor complex Research
Researchers studying mRNA cleavage factor complex-related genes often need to determine whether a candidate gene is causally involved in 3' end processing, transcription termination, or stress-responsive gene regulation. Establishing causality requires precise genetic models that can separate catalytic activity from complex assembly and from downstream transcriptional effects [4,5]. EDITGENE provides CRISPR-based cell models and screening services designed to support this kind of mechanistic work on GO:0005849.
Contact EDITGENE today to design your custom CRISPR model for mRNA cleavage factor complex research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| CSTF2 Knockout HEK293 Cell Line | EDJ-KQ4377 | Human | 1478 | Details Get a Quote |
| SCAF8 Knockout HEK293 Cell Line | EDJ-KQ7690 | Human | 22828 | Details Get a Quote |
| CPSF7 Knockout HEK293 Cell Line | EDJ-KQ12220 | Human | 79869 | Details Get a Quote |
| SCAF8 Knockout A-549 Cell Line | EDJ-KQ33060 | Human | 22828 | Details Get a Quote |
| SCAF8 Knockout HCT 116 Cell Line | EDJ-KQ33061 | Human | 22828 | Details Get a Quote |
| SCAF8 Knockout HeLa Cell Line | EDJ-KQ33062 | Human | 22828 | Details Get a Quote |
| CPSF7 Knockout A-549 Cell Line | EDJ-KQ40969 | Human | 79869 | Details Get a Quote |
| CPSF7 Knockout HCT 116 Cell Line | EDJ-KQ40970 | Human | 79869 | Details Get a Quote |
| CPSF7 Knockout HeLa Cell Line | EDJ-KQ40971 | Human | 79869 | Details Get a Quote |
| CSTF2 Knockout HeLa Cell Line | EDJ-KQ25618 | Human | 1478 | Details Get a Quote |
| CSTF2 Knockout A-549 Cell Line | EDJ-KQ26894 | Human | 1478 | Details Get a Quote |
| CSTF2 Knockout HCT 116 Cell Line | EDJ-KQ26895 | Human | 1478 | Details Get a Quote |
| Cstf2 Knockout B16-F10 Cell Line | EDJ-KZ170 | Mouse | 1478 | Details Get a Quote |
Frequently Asked Questions About mRNA cleavage factor complex
What is the mRNA cleavage factor complex (GO:0005849)?
It is any macromolecular complex involved in cleavage or polyadenylation of mRNA molecules, as defined by GO:0005849.
What genes are involved in the mRNA cleavage factor complex?
Key genes include CPSF1, CPSF2, CPSF3, CPSF4, FIP1L1, WDR33, CSTF1, CSTF2, CF I subunits, CF IB/Hrp1, and Ysh1 [1,4,5,8].
Why is the mRNA cleavage factor complex important?
It defines mRNA 3' ends, controls polyadenylation site choice, and couples cleavage to transcription termination, making it essential for gene expression [1,2,4].
How is the cleavage and polyadenylation complex activated?
The endonuclease that defines mRNA 3' ends requires incorporation into an 8-subunit core cleavage and polyadenylation factor complex for activation.
What is the role of CF I in mRNA cleavage?
The plant Cleavage Factor I complex is essential for precise cleavage and polyadenylation site determination.
How is the Ysh1 endonuclease regulated?
Ysh1 is regulated by ubiquitin-mediated degradation, which controls its availability within the complex.
Does the mRNA cleavage factor complex affect transcription termination?
Yes, pre-mRNA processing factors differentially impact coordination between co-transcriptional cleavage and transcription termination.
What is telescripting and how does it relate to GO:0005849?
Telescripting is controlled by a complex of U1 snRNP with cleavage and polyadenylation factors and regulates mRNA transcription in human cells.
Is the mRNA cleavage factor complex involved in stress responses?
Yes, the 3' mRNA cleavage and polyadenylation complex regulates the hypertonic stress response.
How can CRISPR be used to study the mRNA cleavage factor complex?
CRISPR knockout, point mutation, knock-in, and overexpression models can test subunit function, assembly, and effects on polyadenylation site choice [1,4,8].
Conclusion
GO:0005849, the mRNA cleavage factor complex, represents the multi-protein machines that cleave and polyadenylate mRNA, thereby defining 3' ends and shaping transcript stability and translation. Core assembly is required for endonuclease activation, accessory factors such as CF I ensure precise site determination, and surveillance factors such as CF IB/Hrp1 couple cleavage to transcription termination. The complex is further regulated by ubiquitin-mediated degradation of Ysh1 and participates in stress responses and telescripting. CRISPR-based knockout, point-mutation, knock-in, and overexpression models provide the experimental toolkit needed to dissect these functions and their links to disease.
References
- 1. Szewc L et al.. 2025. The plant Cleavage Factor I complex is essential for precise cleavage and polyadenylation site determination.. Plant Physiol 199(3) PMID: 41066534
- 2. Jin X et al.. 2025. Pre-mRNA processing factors differentially impact coordination between co-transcriptional cleavage and transcription termination.. Nat Commun 16(1):7086 PMID: 40750766
- 3. Cheng S et al.. 2024. Two mechanisms repress cyclin B1 translation to maintain prophase arrest in mouse oocytes.. Nat Commun 15(1):10044 PMID: 39567493
- 4. Hill CH et al.. 2019. Activation of the Endonuclease that Defines mRNA 3' Ends Requires Incorporation into an 8-Subunit Core Cleavage and Polyadenylation Factor Complex.. Mol Cell 73(6):1217-1231.e11 PMID: 30737185
- 5. Li J et al.. 2023. Surveillance of 3' mRNA cleavage during transcription termination requires CF IB/Hrp1.. Nucleic Acids Res 51(16):8758-8773 PMID: 37351636
- 6. Urso SJ et al.. 2023. Regulation of the hypertonic stress response by the 3' mRNA cleavage and polyadenylation complex.. Genetics 224(1) PMID: 36972377
- 7. So BR et al.. 2019. A Complex of U1 snRNP with Cleavage and Polyadenylation Factors Controls Telescripting, Regulating mRNA Transcription in Human Cells.. Mol Cell 76(4):590-599.e4 PMID: 31522989
- 8. Lee SD et al.. 2020. Regulation of the Ysh1 endonuclease of the mRNA cleavage/polyadenylation complex by ubiquitin-mediated degradation.. RNA Biol 17(5):689-702 PMID: 32009536
