GO:0045836 positive regulation of meiotic nuclear division: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045836 (positive regulation of meiotic nuclear division) describes any process that activates or increases the frequency, rate or extent of meiosis.
• Meiotic progression is controlled by both positive and negative regulators that ensure timely entry into and completion of the meiotic divisions.
• Key positive regulators include the DNA damage checkpoint kinase Mec1(ATR), which promotes meiotic double-strand break formation, and the FIGNL1-FIRRM complex, which prevents aberrant RAD51/DMC1 loading.
• The nucleolar protein Cdc14 and vesicle trafficking regulators such as CCDC41 and Rab GTPases also drive meiotic progression.
• Dysregulation of meiotic positive regulators is linked to aneuploidy, infertility and cancer.
• CRISPR-based knockout, point mutation, knock-in and overexpression models enable causal testing of candidate meiotic regulators.
Description
Meiosis is the specialized cell division that produces haploid gametes, and its proper regulation is essential for sexual reproduction and genome stability. The Gene Ontology term GO:0045836, positive regulation of meiotic nuclear division, captures any process that activates or increases the frequency, rate or extent of meiosis. This term is distinct from the core meiotic machinery itself; it encompasses signaling events, checkpoint kinases, recombination modulators and trafficking factors that positively drive meiotic entry and progression. Understanding these positive regulators is critical because their misregulation can lead to aneuploidy, infertility and developmental disorders. In this article, we synthesize authoritative QuickGO annotation data with verified PubMed literature to provide a research-grade overview of the mechanisms, key genes and experimental models used to study positive regulation of meiotic nuclear division.
positive regulation of meiotic nuclear division At A Glance
| GO ID | GO:0045836 |
|---|---|
| GO term | positive regulation of meiotic nuclear division |
| Ontology | biological_process |
| Synonym | activation of meiosis; positive regulation of meiosis; stimulation of meiosis; up regulation of meiosis; up-regulation of meiosis; upregulation of meiosis |
| Definition | Any process that activates or increases the frequency, rate or extent of meiosis. |
| Major function | Positive control of meiotic entry, progression and completion. |
| Related processes | Meiotic recombination, double-strand break formation, oocyte maturation, sporulation. |
What Is GO:0045836?
In our own words, GO:0045836 refers to any biological process that stimulates, accelerates or enhances the initiation, frequency or completion of meiotic nuclear division. It includes molecular events such as activation of checkpoint kinases that promote double-strand break formation, positive modulation of recombination factors, and signaling pathways that drive oocyte maturation. This term is a biological process and is not restricted to a single gene or pathway; rather, it collects diverse positive regulators that collectively ensure meiosis proceeds efficiently.
Why Is positive regulation of meiotic nuclear division Important in Cell Biology?
Positive regulation of meiotic nuclear division is fundamental to fertility and genetic diversity. Errors in this process cause aneuploidy, which is a leading cause of miscarriage and congenital disorders. Moreover, many positive regulators of meiosis are conserved from yeast to humans, making them tractable models for understanding cell cycle control and DNA repair. In cancer, meiotic genes are sometimes ectopically expressed, contributing to genomic instability. Thus, studying GO:0045836 has broad implications for reproductive biology, developmental genetics and oncology.
• Ensures timely entry into meiosis and production of haploid gametes.
• Promotes meiotic recombination and proper chromosome segregation.
• Prevents aneuploidy and infertility.
• Coordinates oocyte maturation with external cues.
• Involves conserved checkpoint kinases such as Mec1(ATR).
• Requires precise regulation of RAD51/DMC1 recombinases.
• Linked to vesicle trafficking and membrane fusion during meiotic progression.
• Dysregulation can contribute to cancer-associated genomic instability.
• Provides targets for contraceptive and fertility treatments.
• Serves as a model for studying cell cycle checkpoints.
What Happens During positive regulation of meiotic nuclear division?
Initiation and commitment to meiosis
In simple terms: Cells decide to start meiosis and commit to the process.
Positive regulation begins with signals that commit a cell to enter meiosis. In yeast, dual regulation by nutritional and genetic cues ensures that meiosis initiates only under favorable conditions. In mammals, oocyte maturation is triggered by exogenous cues that interact with the microtubule cytoskeleton. These early events set the stage for subsequent meiotic divisions.
Activation of meiotic DNA double-strand break formation
In simple terms: The cell deliberately breaks its DNA to start recombination.
Meiotic recombination is initiated by programmed DNA double-strand breaks (DSBs). The DNA damage checkpoint kinase Mec1(ATR) positively regulates DSB formation, ensuring that breaks occur at the right time and place. This activation is essential for homologous recombination and subsequent chromosome segregation.
Regulation of recombinase loading and recombination
In simple terms: Helper proteins control where and when recombination enzymes work.
The FIGNL1-FIRRM complex is essential for meiotic recombination and prevents DNA damage-independent loading of RAD51 and DMC1. Positive regulators of RAD51/DMC1, such as BRCA2 and other mediators, promote strand invasion and exchange. This step ensures accurate repair and crossover formation.
Nucleolar control and cell cycle progression
In simple terms: A structure inside the nucleus helps coordinate the timing of meiosis.
The nucleolus plays a role in meiotic recombination and cell cycle control. Cdc14, a phosphatase that regulates exit from mitosis, also influences meiotic progression. Its function highlights the integration of cell cycle machinery with meiotic events.
Vesicle trafficking and membrane fusion during meiotic progression
In simple terms: Moving membranes around helps the cell divide.
CCDC41 drives oocyte meiotic progression by promoting Rab11a/Rab7-positive vesicle fusion with target membranes. This trafficking is necessary for the structural changes that occur during meiotic divisions. It represents a less conventional but important positive regulatory mechanism.
Key Genes Involved in GO:0045836 positive regulation of meiotic nuclear division
The following genes and proteins are established positive regulators or modulators of meiotic nuclear division, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MEC1/ATR | Checkpoint kinase that promotes meiotic DSB formation | Studied for DNA damage response and recombination |
| FIGNL1 | Prevents aberrant RAD51/DMC1 loading; essential for recombination | Target for understanding recombination fidelity |
| FIRRM | Partners with FIGNL1 to regulate recombinase loading | Complex studied in meiosis and cancer |
| RAD51 | Recombinase that catalyzes strand invasion | Key player in homologous recombination |
| DMC1 | Meiosis-specific recombinase | Essential for interhomolog recombination |
| CDC14 | Phosphatase regulating cell cycle exit and nucleolar function | Links cell cycle to meiotic progression |
| CCDC41 | Promotes vesicle fusion during oocyte meiosis | Involved in membrane trafficking |
| RAB11A | Small GTPase regulating vesicle trafficking | Required for meiotic progression |
| RAB7 | Late endosomal GTPase | Participates in vesicle fusion |
| GCS1 | Arf-GTPase-activating protein essential for sporulation | Regulates phospholipase D during meiosis |
| SPO14 | Phospholipase D involved in sporulation | Regulated by Gcs1p |
| BRCA2 | Mediator of RAD51 loading | Positive regulator of recombination |
| MRE11 | Part of MRN complex involved in DSB repair | Acts in meiotic recombination |
| RAD50 | MRN complex component | DSB repair and signaling |
| NBS1 | MRN complex component | DSB repair and signaling |
| CDK1 | Cyclin-dependent kinase driving meiotic divisions | Central to cell cycle progression |
| MOS | MAPK pathway activator in oocytes | Regulates meiotic maturation |
How Is positive regulation of meiotic nuclear division Regulated?
Positive regulation of meiotic nuclear division is itself tightly regulated. In yeast, dual regulation ensures meiosis occurs only under appropriate conditions. The DNA damage checkpoint kinase Mec1(ATR) is activated by DSBs and in turn promotes further DSB formation, creating a positive feedback loop. In oocytes, exogenous cues such as hormones and growth factors interact with the microtubule cytoskeleton to regulate meiotic maturation. Additionally, the nucleolar phosphatase Cdc14 is regulated by the cell cycle machinery, influencing meiotic progression. Vesicle trafficking regulators like CCDC41 and Rab GTPases are also subject to spatial and temporal control.
positive regulation of meiotic nuclear division and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FIGNL1 | Meiotic recombination defects, infertility | Knockout mouse or cell line |
| RAD51 | Cancer susceptibility, genome instability | Point mutation knock-in |
| DMC1 | Meiotic arrest, infertility | Knockout model |
| CCDC41 | Oocyte maturation defects | Overexpression or knockout in oocytes |
| CDC14 | Cell cycle dysregulation, cancer | Knockout and rescue |
Aneuploidy and infertility
Errors in positive regulation of meiosis lead to aneuploidy, a major cause of miscarriage and infertility. Defects in recombination regulators such as FIGNL1, RAD51 and DMC1 can cause meiotic arrest and gametogenic failure.
Cancer
Ectopic expression of meiotic genes, including recombinases, is observed in some cancers and contributes to genomic instability. Positive regulators of meiosis may therefore be oncogenic when misregulated.
Developmental disorders
Proper meiotic progression is essential for normal development. Disruption of vesicle trafficking during oocyte meiosis, for example, can impair embryo development.
From positive regulation of meiotic nuclear division-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X positively regulate meiotic DSB formation? | Knockout of X in yeast or mouse germ cells |
| Does a point mutation in X affect recombinase loading? | Point mutation knock-in |
| Can overexpression of X accelerate meiosis? | Overexpression cell model |
| Where does X localize during meiosis? | Tagged knock-in with fluorescent protein |
| Does X interact with Y? | Co-immunoprecipitation in knockout background |
| Is X required for fertility? | Knockout mouse fertility assessment |
How to Study the positive regulation of meiotic nuclear division Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Loss-of-function effects on meiosis | Identify positive regulators |
| Live-cell imaging | Protein localization and dynamics | Study RAD51/DMC1 loading |
| RNA-seq | Transcriptional changes during meiosis | Discover new regulators |
| Phosphoproteomics | Kinase signaling events | Map Mec1/ATR targets |
| In vitro strand exchange | Recombinase activity | Test FIGNL1-FIRRM function |
| Vesicle fusion assay | Membrane fusion efficiency | Study CCDC41/Rab function |
| Fertility assessment | Reproductive capacity | Evaluate knockout models |
Genetic screens and CRISPR knockout
CRISPR knockout screens can identify positive regulators of meiosis by assessing meiotic progression or sporulation efficiency. Targeted knockouts of candidate genes such as FIGNL1 or MEC1 confirm their roles.
Live-cell imaging and immunofluorescence
Imaging of meiotic chromosome spreads and tagged proteins reveals the localization and dynamics of positive regulators like RAD51 and DMC1. Time-lapse microscopy of oocytes can track meiotic maturation.
Transcriptomics and proteomics
RNA-seq and proteomics can identify genes and proteins whose expression changes during meiosis, revealing potential positive regulators. Phosphoproteomics can uncover signaling events driven by checkpoint kinases.
Biochemical assays for recombination
In vitro assays using purified proteins can measure strand exchange, ATP hydrolysis and complex formation by recombinases and their regulators. Vesicle fusion assays can test trafficking regulators.
How CRISPR Can Be Used to Study GO:0045836 positive regulation of meiotic nuclear division
Knockout
CRISPR knockout of candidate positive regulators such as FIGNL1 or MEC1 allows researchers to test whether loss of function reduces meiotic progression. Knockout models in yeast, mouse or cell lines can reveal essential roles in sporulation or gametogenesis.
Point Mutation
Point mutation knock-in can mimic disease-associated or phospho-null variants of regulators like RAD51 or CDC14, enabling precise structure-function studies. This approach distinguishes catalytic activity from scaffolding functions.
Knock-in
Tagged knock-in of endogenous genes with fluorescent or epitope tags allows real-time tracking of protein localization during meiosis. Knock-in of reporter genes can also monitor meiotic progression.
Overexpression
Overexpression of positive regulators such as CCDC41 or RAB11A can accelerate or enhance meiotic progression, providing gain-of-function evidence. Inducible systems allow temporal control.
How EDITGENE Supports positive regulation of meiotic nuclear division Research
Researchers studying positive regulation of meiotic nuclear division-related genes often need to determine whether a candidate gene is causally involved in meiotic progression or simply correlated with it. EDITGENE provides a comprehensive suite of CRISPR-based services to enable such causal experiments.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of meiotic nuclear division research.
Frequently Asked Questions About positive regulation of meiotic nuclear division
What is GO:0045836?
GO:0045836 is the Gene Ontology term for positive regulation of meiotic nuclear division, defined as any process that activates or increases the frequency, rate or extent of meiosis.
What genes are involved in positive regulation of meiotic nuclear division?
Key genes include MEC1/ATR, FIGNL1, FIRRM, RAD51, DMC1, CDC14, CCDC41, RAB11A, RAB7, GCS1 and SPO14.
How is meiotic nuclear division positively regulated?
It is positively regulated by checkpoint kinases, recombination mediators, cell cycle phosphatases and vesicle trafficking factors that together promote meiotic entry and progression.
What diseases are linked to defects in meiotic positive regulation?
Defects can cause aneuploidy, infertility, miscarriage and are associated with cancer genomic instability.
What model systems are used to study GO:0045836?
Yeast, mouse oocytes and mammalian cell lines are commonly used, with CRISPR knockout, knock-in and overexpression approaches.
How does Mec1(ATR) regulate meiosis?
Mec1(ATR) positively regulates meiotic DNA double-strand break formation, promoting recombination.
What is the role of FIGNL1 in meiosis?
FIGNL1, together with FIRRM, is essential for meiotic recombination and prevents DNA damage-independent RAD51 and DMC1 loading.
Can CRISPR be used to study positive regulation of meiosis?
Yes, CRISPR knockout, point mutation, knock-in and overexpression models enable causal testing of candidate regulators.
What is the difference between positive and negative regulation of meiosis?
Positive regulation activates or increases meiosis, while negative regulation inhibits or decreases it; both are essential for proper timing.
How can I identify new positive regulators of meiosis?
Genome-wide CRISPR screens combined with meiotic progression readouts and bioinformatics can identify novel regulators.
Conclusion
GO:0045836, positive regulation of meiotic nuclear division, encompasses a diverse set of molecular events that ensure meiosis proceeds efficiently and accurately. From checkpoint kinases like Mec1(ATR) to recombination modulators such as FIGNL1-FIRRM and trafficking regulators like CCDC41, these positive regulators are essential for fertility and genome stability. Understanding their mechanisms offers insights into aneuploidy, infertility and cancer, and provides targets for therapeutic intervention. CRISPR-based models are powerful tools for dissecting these pathways, and EDITGENE offers comprehensive services to support such research.
References
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- 2. Connolly JE et al.. 2006. The Arf-GTPase-activating protein Gcs1p is essential for sporulation and regulates the phospholipase D Spo14p.. Eukaryot Cell 5(1):112-24 PMID: 16400173
- 3. Albertini DF. 1992. Regulation of meiotic maturation in the mammalian oocyte: interplay between exogenous cues and the microtubule cytoskeleton.. Bioessays 14(2):97-103 PMID: 1575717
- 4. Alonso-Ramos P et al.. 2024. Decoding the Nucleolar Role in Meiotic Recombination and Cell Cycle Control: Insights into Cdc14 Function.. Int J Mol Sci 25(23) PMID: 39684572
- 5. Gray S et al.. 2013. Positive regulation of meiotic DNA double-strand break formation by activation of the DNA damage checkpoint kinase Mec1(ATR).. Open Biol 3(7):130019 PMID: 23902647
- 6. Tian Y et al.. 2026. CCDC41 Drives Oocyte Meiotic Progression by Promoting Rab11a/Rab7-Positive Vesicle Fusion with Target Membranes.. Adv Sci (Weinh) 13(8):e04665 PMID: 41331237
- 7. Ito M et al.. 2024. Positive and negative regulators of RAD51/DMC1 in homologous recombination and DNA replication.. DNA Repair (Amst) 134:103613 PMID: 38142595
- 8. Malone RE. 1990. Dual regulation of meiosis in yeast.. Cell 61(3):375-8 PMID: 2185888
