GO:0051321 meiotic cell cycle: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0051321 (meiotic cell cycle) describes the specialized cell cycle that produces four haploid gametes from one diploid progenitor through two successive nuclear divisions.
• Progression through meiosis is driven by conserved cell-cycle regulators, including cyclins and CDK1/MPF, which control meiotic resumption, spindle assembly, and polar body extrusion.
• Oocyte meiotic arrest and resumption are tightly regulated by calcium signaling, MPF activity, and maternal RNA/protein stores.
• Meiotic errors cause aneuploidy, a leading genetic cause of miscarriage, infertility, and developmental disorders such as Down syndrome.
• Key experimental models for meiotic cell cycle research include mouse oocytes, starfish oocytes, and Arabidopsis gametophytes.
• CRISPR-based knockout, point-mutation, and knock-in models enable causal testing of meiotic genes in oocytes and germline cells.
Description
The meiotic cell cycle (GO:0051321) is a specialized biological process in which a diploid cell undergoes one round of DNA replication followed by two successive nuclear divisions to produce four haploid offspring cells. This process is essential for sexual reproduction, generating gametes with half the chromosomal content of the progenitor cell. Unlike mitosis, meiosis includes a prolonged prophase I with homologous recombination and two distinct division phases, meiosis I and meiosis II, each regulated by conserved cell-cycle machinery. Researchers study meiotic cell cycle control to understand fertility, aneuploidy, and germline development across species, from mammals to plants. Defects in meiotic progression are associated with oocyte maturation arrest, chromosomal instability, and reproductive disorders.
meiotic cell cycle At A Glance
| GO ID | GO:0051321 |
|---|---|
| GO term | meiotic cell cycle |
| Ontology | biological_process |
| Synonym | meiosis |
| Major function | Production of four haploid cells from a diploid progenitor via two nuclear divisions |
| Key regulators | Cyclins, CDK1/MPF, calcium signaling, maternal factors |
| Associated diseases | Aneuploidy, infertility, miscarriage, developmental disorders |
| Model organisms | Mouse, starfish, Arabidopsis, mammalian oocytes |
What Is GO:0051321?
GO:0051321 (meiotic cell cycle) is defined by QuickGO as the progression through the phases of the meiotic cell cycle, in which canonically a cell replicates to produce four offspring with half the chromosomal content of the progenitor cell via two nuclear divisions. In simpler terms, it is the entire sequence of events by which a diploid cell divides twice to form haploid gametes, including DNA replication, homologous recombination, and two rounds of chromosome segregation.
Why Is meiotic cell cycle Important in Cell Biology?
Understanding the meiotic cell cycle is fundamental to reproductive biology and developmental genetics because errors in this process directly cause aneuploidy, which is the leading genetic cause of miscarriage and congenital disorders such as Down syndrome. Meiotic progression also serves as a paradigm for cell-cycle control, revealing conserved mechanisms of MPF regulation, calcium signaling, and cyclin-dependent kinase activity that are relevant across eukaryotes. Research on meiotic cell cycle genes informs fertility preservation, assisted reproduction, and germline gene editing.
• Meiotic cell cycle errors cause aneuploidy, a major cause of miscarriage and developmental disorders.
• Oocyte meiotic arrest and resumption are regulated by MPF and calcium signaling, key targets for fertility research.
• Cyclins control meiotic progression and are essential for oocyte maturation.
• Maternal factors such as NAT10 regulate meiotic cell-cycle progression and oocyte maturation.
• Meiotic cell cycle studies in Arabidopsis reveal conserved and plant-specific gametophyte development mechanisms.
• Comparative studies across mammals highlight species-specific aspects of meiotic control.
• Meiotic recombination and chromosome segregation are central to genetic diversity.
• Defects in meiotic progression are linked to premature ovarian insufficiency and infertility.
• Meiotic cell cycle research provides targets for contraceptives and reproductive medicine.
• CRISPR models enable functional dissection of meiotic genes in vivo.
What Happens During meiotic cell cycle?
Meiotic initiation and DNA replication
In simple terms: The cell prepares for meiosis by copying its DNA once.
The meiotic cell cycle begins with a single round of DNA replication during pre-meiotic S phase, producing sister chromatids that will be segregated in two subsequent divisions. This replication is followed by entry into prophase I, where homologous chromosomes pair and recombine. In mammals, oocytes enter meiosis during fetal development and arrest at prophase I until meiotic resumption.
Meiosis I: homologous chromosome segregation
In simple terms: The first division separates homologous chromosomes, reducing chromosome number by half.
During meiosis I, homologous chromosomes separate while sister chromatids remain together, resulting in two haploid cells. This division is driven by MPF (maturation promoting factor), a complex of CDK1 and cyclin B, whose activity oscillates to control spindle assembly and chromosome segregation. In oocytes, meiosis I completes with extrusion of the first polar body.
Meiosis II: sister chromatid segregation
In simple terms: The second division separates sister chromatids, producing four haploid cells.
Meiosis II resembles mitosis in that sister chromatids are separated, but it occurs without an intervening S phase, yielding four haploid offspring cells. This division is also regulated by MPF and cyclin-dependent kinases, with calcium signaling contributing to meiotic resumption and progression. In mammalian oocytes, meiosis II arrests at metaphase II until fertilization triggers completion.
Meiotic arrest and resumption
In simple terms: Oocytes pause at specific stages and restart meiosis in response to signals.
Mammalian oocytes arrest at prophase I and later at metaphase II, with resumption controlled by hormonal and calcium signals. MPF activation is central to meiotic resumption, and its regulation involves cyclin synthesis and degradation. Calcium signaling pathways modulate meiotic cell cycle progression and apoptosis in oocytes.
Cytokinesis and polar body formation
In simple terms: The cell divides unequally to produce a large egg and small polar bodies.
Meiotic divisions in oocytes are asymmetric, producing one large ovum and two small polar bodies to conserve cytoplasmic resources for the future embryo. This asymmetry depends on spindle positioning and actomyosin contractility, regulated by cell-cycle kinases. Cyclins play key roles in coordinating cytokinesis with meiotic progression.
Key Genes Involved in GO:0051321 meiotic cell cycle
The following genes and proteins are central to meiotic cell cycle regulation, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CDK1 | Catalytic subunit of MPF; drives meiotic resumption and progression | Target for oocyte maturation studies |
| CCNB1 | Cyclin B1; regulatory subunit of MPF | Essential for meiosis I and II transitions |
| NAT10 | Maternal factor; regulates oocyte meiotic cell-cycle progression | Knockout causes meiotic defects in mice |
| MOS | MAPK pathway activator; maintains metaphase II arrest | Studied in oocyte maturation |
| MAPK1 | Mitogen-activated protein kinase; regulates spindle assembly and arrest | Involved in meiotic arrest |
| CALM1 | Calmodulin; mediates calcium signaling | Regulates meiotic resumption and apoptosis |
| CAMKII | Calcium/calmodulin-dependent kinase II; controls meiotic progression | Target in oocyte activation |
| CDC25 | Phosphatase; activates CDK1 | Regulates MPF activity |
| WEE1 | Kinase; inhibits CDK1 | Controls timing of meiotic resumption |
| SEP1 | Separase; cleaves cohesin for chromosome segregation | Required for meiosis I and II |
| REC8 | Meiosis-specific cohesin subunit | Essential for sister chromatid cohesion |
| DMC1 | Meiosis-specific recombinase | Required for homologous recombination |
| SPO11 | Initiates meiotic double-strand breaks | Conserved in plants and mammals |
| BUB1 | Spindle assembly checkpoint kinase | Monitors chromosome segregation |
| MAD2 | Spindle checkpoint protein | Prevents aneuploidy |
| AURKA | Aurora kinase A; regulates spindle assembly | Target for meiotic spindle studies |
| PLK1 | Polo-like kinase 1; controls meiotic progression | Involved in polar body extrusion |
| PTTG1 | Securin; regulates separase activity | Controls sister chromatid separation |
How Is meiotic cell cycle Regulated?
The meiotic cell cycle is regulated by a conserved network of kinases and phosphatases, with MPF (CDK1-cyclin B) as the central driver. MPF activity oscillates due to synthesis and degradation of cyclin B, and is modulated by CDC25 phosphatase and WEE1 kinase. Calcium signaling pathways regulate meiotic resumption and progression in mammalian oocytes. Maternal factors such as NAT10 control meiotic cell-cycle progression and oocyte maturation. In plants, meiotic mutants reveal conserved and plant-specific regulators of gametophyte development.
meiotic cell cycle and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NAT10 | Oocyte maturation defects | Knockout mouse oocyte |
| CCNB1 | Infertility, meiotic arrest | Point mutation knock-in in oocytes |
| CDK1 | Meiotic progression failure | Conditional knockout in germ cells |
| CALM1 | Calcium signaling defects in oocytes | Overexpression in oocytes |
| REC8 | Aneuploidy, cohesion defects | Knockout mouse model |
Aneuploidy and reproductive disorders
Errors in meiotic chromosome segregation lead to aneuploidy, a leading cause of miscarriage, infertility, and developmental disorders such as Down syndrome. Defects in meiotic cell cycle progression, including premature or delayed resumption, contribute to oocyte maturation arrest and aneuploidy.
Oocyte maturation arrest and infertility
Disruption of MPF regulation, cyclin function, or calcium signaling causes oocyte meiotic arrest and failure to mature, resulting in infertility. Mutations in meiotic genes such as NAT10 impair oocyte maturation in mice.
Cancer and genomic instability
Meiotic genes are occasionally reactivated in cancer, contributing to genomic instability and aneuploidy. Aberrant expression of meiotic regulators like Aurora kinases is observed in various cancers.
From meiotic cell cycle-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate meiotic resumption? | Knockout oocyte model |
| Does a specific mutation in CDK1 affect MPF activity? | Point mutation knock-in |
| How does NAT10 acetylation affect meiotic progression? | Knock-in of acetylation-deficient mutant |
| Where is cyclin B1 localized during meiosis? | Tagged knock-in (GFP) |
| Does overexpression of CALM1 alter calcium signaling? | Overexpression in oocytes |
| What is the role of SPO11 in recombination? | Knockout in Arabidopsis |
How to Study the meiotic cell cycle Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Spindle dynamics, chromosome segregation | Oocyte maturation studies |
| RNA-seq | Transcript abundance changes | Stage-specific gene expression |
| Proteomics | Protein levels and modifications | MPF component analysis |
| Phosphoproteomics | Kinase substrate identification | CDK1 target discovery |
| CRISPR knockout screen | Gene essentiality for meiosis | Novel regulator discovery |
| Immunofluorescence | Protein localization | Spindle and chromosome studies |
| Calcium imaging | Intracellular calcium dynamics | Meiotic resumption signaling |
Live-cell imaging of meiotic progression
Time-lapse microscopy of oocytes expressing fluorescently tagged proteins (e.g., histone H2B-GFP, tubulin-GFP) allows real-time monitoring of spindle assembly, chromosome segregation, and polar body extrusion. This method is essential for studying meiotic cell cycle dynamics.
RNA-seq and transcriptomics
RNA sequencing of oocytes at different meiotic stages reveals dynamic changes in maternal transcripts and identifies genes regulating meiotic progression. Comparative transcriptomics across species highlights conserved and divergent meiotic pathways.
Proteomics and phosphoproteomics
Mass spectrometry-based proteomics quantifies MPF components and their phosphorylation states during meiotic progression. Phosphoproteomics identifies substrates of CDK1 and other meiotic kinases.
CRISPR-based functional screens
Pooled CRISPR knockout screens in oocyte-derived cell lines or germline stem cells can identify genes required for meiotic cell cycle progression. Candidate validation is performed by targeted knockout or knock-in in mouse models.
How CRISPR Can Be Used to Study GO:0051321 meiotic cell cycle
Knockout
CRISPR knockout of meiotic genes such as Nat10 in mouse oocytes demonstrates their essential roles in meiotic cell-cycle progression and maturation. Knockout models are used to assess loss-of-function phenotypes in germline development.
Point Mutation
Point mutations in CDK1 or cyclin B1 can be introduced to dissect phosphorylation sites required for MPF activity and meiotic progression. Such models help distinguish catalytic versus regulatory functions.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) into endogenous meiotic genes allows real-time visualization of protein localization during meiosis. Knock-in of disease-associated mutations models meiotic defects.
Overexpression
Overexpression of calcium signaling components such as CALM1 or CAMKII in oocytes alters meiotic resumption and progression, providing gain-of-function insights. Overexpression models complement knockout studies.
How EDITGENE Supports meiotic cell cycle Research
Researchers studying meiotic cell cycle-related genes often need to determine whether a candidate gene is causally involved in meiotic progression, and CRISPR-based models provide the most direct approach for functional validation.
Contact EDITGENE today to design your custom CRISPR model for meiotic cell cycle research.
Frequently Asked Questions About meiotic cell cycle
What is the meiotic cell cycle?
The meiotic cell cycle (GO:0051321) is the progression through phases in which a diploid cell replicates and undergoes two nuclear divisions to produce four haploid offspring cells.
What genes are involved in the meiotic cell cycle?
Key genes include CDK1, CCNB1, NAT10, MOS, MAPK1, CALM1, CAMKII, REC8, DMC1, and SPO11, among others.
How is the meiotic cell cycle regulated?
It is regulated by MPF (CDK1-cyclin B), calcium signaling, and maternal factors such as NAT10.
What happens during meiosis I?
During meiosis I, homologous chromosomes separate while sister chromatids remain together, reducing chromosome number by half.
What is the role of MPF in meiosis?
MPF (maturation promoting factor) drives meiotic resumption and progression by phosphorylating targets involved in spindle assembly and chromosome segregation.
How does calcium signaling affect meiosis?
Calcium signaling regulates meiotic resumption, progression, and apoptosis in mammalian oocytes.
What diseases are linked to meiotic cell cycle defects?
Defects cause aneuploidy, miscarriage, infertility, and developmental disorders such as Down syndrome.
Which model organisms are used to study meiosis?
Mouse oocytes, starfish oocytes, and Arabidopsis gametophytes are common models.
How can CRISPR be used to study meiotic genes?
CRISPR knockout, point mutation, knock-in, and overexpression models enable functional dissection of meiotic genes in oocytes and germline cells.
What methods are used to study the meiotic cell cycle?
Live-cell imaging, RNA-seq, proteomics, phosphoproteomics, and CRISPR screens are widely used.
Conclusion
The meiotic cell cycle (GO:0051321) is a highly regulated process essential for sexual reproduction, and its dysregulation leads to aneuploidy and infertility. Research using CRISPR models and advanced omics is uncovering conserved and species-specific mechanisms of meiotic control. Continued investigation of meiotic cell cycle genes will advance reproductive medicine and our understanding of genome stability.
References
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- 2. Li J et al.. 2019. Cyclins regulating oocyte meiotic cell cycle progression†.. Biol Reprod 101(5):878-881 PMID: 31347666
- 3. Tripathi A et al.. 2010. Meiotic cell cycle arrest in mammalian oocytes.. J Cell Physiol 223(3):592-600 PMID: 20232297
- 4. Kishimoto T. 2018. MPF-based meiotic cell cycle control: Half a century of lessons from starfish oocytes.. Proc Jpn Acad Ser B Phys Biol Sci 94(4):180-203 PMID: 29643273
- 5. Tiwari M et al.. 2017. Calcium Signaling During Meiotic Cell Cycle Regulation and Apoptosis in Mammalian Oocytes.. J Cell Physiol 232(5):976-981 PMID: 27791263
- 6. Kishimoto T. 2003. Cell-cycle control during meiotic maturation.. Curr Opin Cell Biol 15(6):654-63 PMID: 14644189
- 7. Liu J et al.. 2008. Meiotic and mitotic cell cycle mutants involved in gametophyte development in Arabidopsis.. Mol Plant 1(4):564-74 PMID: 19825562
- 8. Albertini DF et al.. 1998. Comparative aspects of meiotic cell cycle control in mammals.. J Mol Med (Berl) 76(12):795-9 PMID: 9846949
