GO:0000802 transverse filament: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0000802 transverse filament is a structural unit of the synaptonemal complex that spans the region between the lateral elements and connects them.
• The transverse filament is essential for synapsis, recombination, and proper chromosome segregation during meiosis.
• Key proteins of the transverse filament include SYCP1, SYCE1, SYCE2, SYCE3, and TEX12, which assemble into a zipper-like structure.
• Defects in transverse filament components are linked to infertility, meiotic arrest, and aneuploidy.
• Research on the transverse filament uses knockout, knock-in, and overexpression models, combined with imaging and proteomics.
• EDITGENE provides CRISPR services to study transverse filament genes, including KO, point mutation, knock-in, and library screening.
Description
The transverse filament (GO:0000802) is a central structural component of the synaptonemal complex, a proteinaceous scaffold that forms between homologous chromosomes during meiosis. It spans the region between the lateral elements and connects them, effectively zippering the homologs together. This structure is critical for synapsis, crossing over, and the faithful segregation of chromosomes. Researchers study the transverse filament to understand the molecular basis of meiosis, recombination, and fertility. Defects in its components can lead to meiotic arrest, aneuploidy, and infertility. The transverse filament is composed of several proteins, including SYCP1, SYCE1, SYCE2, SYCE3, and TEX12, which assemble into a highly ordered structure. Understanding its assembly and function is essential for reproductive biology and for developing therapeutic strategies for infertility.
transverse filament At A Glance
| GO ID | GO:0000802 |
|---|---|
| GO term | transverse filament |
| Ontology | cellular_component |
| Synonym | none |
| Major function | Structural unit of the synaptonemal complex that connects lateral elements |
| Located in | Synaptonemal complex |
| Part of | Synaptonemal complex |
| Associated proteins | SYCP1, SYCE1, SYCE2, SYCE3, TEX12 |
What Is GO:0000802?
The transverse filament is a structural unit of the synaptonemal complex that spans the regions between the lateral elements and connects them, as defined by the Gene Ontology (GO:0000802). It is a key component of the synaptonemal complex, which forms during meiotic prophase I.
Why Is transverse filament Important in Cell Biology?
The transverse filament is essential for meiosis, as it mediates synapsis and recombination between homologous chromosomes. Without a functional transverse filament, chromosomes fail to pair and segregate properly, leading to aneuploidy and infertility. Studying its components provides insights into reproductive diseases and potential contraceptive targets.
• Essential for synapsis and recombination during meiosis.
• Defects cause meiotic arrest and infertility.
• Implicated in aneuploidy and miscarriage.
• Target for reproductive biology research.
• Model for studying protein-protein interactions in the synaptonemal complex.
• Relevant to cancer research due to genomic instability.
• Potential contraceptive target.
• Key to understanding evolution of meiosis.
What Happens During transverse filament?
Assembly of the transverse filament
In simple terms: The transverse filament is built like a zipper between chromosomes.
During meiotic prophase I, the transverse filament assembles between the lateral elements of homologous chromosomes. SYCP1 forms the core, while SYCE1, SYCE2, SYCE3, and TEX12 stabilize the structure.
Synapsis and recombination
In simple terms: The filament helps chromosomes pair and exchange DNA.
The transverse filament brings homologous chromosomes into close alignment, facilitating crossing over and genetic exchange.
Disassembly and segregation
In simple terms: After recombination, the filament comes apart so chromosomes can separate.
Following recombination, the transverse filament disassembles, allowing homologous chromosomes to segregate during meiosis I.
Key Genes Involved in GO:0000802 transverse filament
The following genes encode proteins that are major components or regulators of the transverse filament.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SYCP1 | Core component of the transverse filament | Essential for synapsis; knockout leads to meiotic arrest |
| SYCE1 | Stabilizes the transverse filament | Mutations linked to infertility |
| SYCE2 | Required for filament assembly | Knockout causes meiotic defects |
| SYCE3 | Structural component | Important for synaptonemal complex integrity |
| TEX12 | Central element protein | Mutations associated with meiotic arrest |
| SYCP2 | Lateral element component | Interacts with transverse filament |
| SYCP3 | Lateral element component | Required for filament attachment |
| HORMAD1 | Meiotic surveillance | Regulates synapsis |
| HORMAD2 | Meiotic surveillance | Regulates synapsis |
| MLH1 | Mismatch repair | Marks crossover sites |
| MLH3 | Mismatch repair | Marks crossover sites |
| RAD51 | Recombinase | Facilitates strand invasion |
| DMC1 | Meiotic recombinase | Essential for recombination |
| BRCA1 | DNA repair | Involved in meiotic recombination |
| BRCA2 | DNA repair | Involved in meiotic recombination |
| ATM | DNA damage response | Regulates meiotic checkpoints |
| SPO11 | Initiates double-strand breaks | Required for recombination |
| REC8 | Cohesin subunit | Maintains sister chromatid cohesion |
How Is transverse filament Regulated?
The transverse filament is regulated by phosphorylation and ubiquitination of its component proteins, as well as by meiotic checkpoints that ensure proper assembly and disassembly.
transverse filament and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SYCP1 | Meiotic arrest, infertility | Knockout mouse, patient-derived cells |
| SYCE1 | Premature ovarian failure | Knock-in mouse, iPSCs |
| TEX12 | Meiotic arrest | Knockout mouse, cell lines |
| SYCE2 | Infertility | Knockout mouse |
| SYCP3 | Azoospermia | Knockout mouse, patient cells |
Infertility and meiotic arrest
Mutations in transverse filament genes such as SYCP1, SYCE1, and TEX12 cause meiotic arrest and infertility in humans and mice.
Aneuploidy and miscarriage
Defective transverse filament assembly leads to chromosome mis-segregation, resulting in aneuploidy and recurrent miscarriage.
Cancer
Genomic instability caused by meiotic defects may contribute to cancer predisposition, although direct links are still under investigation.
From transverse filament-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate transverse filament assembly? | Knockout cell line |
| What is the effect of a patient mutation? | Point mutation knock-in |
| Where does the protein localize? | Tagged knock-in |
| Can overexpression rescue a defect? | Overexpression cell line |
| What are the interaction partners? | Affinity purification proteomics |
| How does the filament disassemble? | Live-cell imaging |
How to Study the transverse filament Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Immunofluorescence | Protein localization | Visualizing synaptonemal complex |
| Electron microscopy | Ultrastructure | Observing transverse filament |
| Co-immunoprecipitation | Protein interactions | Identifying complex components |
| Mass spectrometry | Protein composition | Proteomics of synaptonemal complex |
| CRISPR knockout | Gene function | Loss-of-function studies |
| RNA-seq | Gene expression | Transcriptional profiling |
| Live-cell imaging | Dynamic assembly | Real-time visualization |
Imaging of the synaptonemal complex
Immunofluorescence and electron microscopy visualize the transverse filament in meiotic cells.
Proteomics and interactomics
Mass spectrometry identifies proteins that co-purify with transverse filament components.
Genetic screens
CRISPR screens in cell lines and mice reveal genes required for transverse filament function.
Transcriptomics
RNA-seq of meiotic cells identifies expression changes in transverse filament genes.
How CRISPR Can Be Used to Study GO:0000802 transverse filament
Knockout
CRISPR knockout of transverse filament genes in cell lines and mice models meiotic defects and infertility.
Point Mutation
Introducing patient-specific point mutations into SYCP1 or SYCE1 recapitulates disease phenotypes.
Knock-in
Tagged knock-in of SYCP1 allows live-cell imaging of the transverse filament.
Overexpression
Overexpression of transverse filament components can disrupt meiotic progression and is used to study dominant effects.
How EDITGENE Supports transverse filament Research
Researchers studying transverse filament-related genes often need to determine whether a candidate gene is causally involved in meiotic assembly, recombination, or infertility. EDITGENE provides a comprehensive suite of CRISPR services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for transverse filament research.
Frequently Asked Questions About transverse filament
What is the transverse filament?
The transverse filament is a structural unit of the synaptonemal complex that spans the region between the lateral elements and connects them.
What genes are involved in the transverse filament?
Key genes include SYCP1, SYCE1, SYCE2, SYCE3, and TEX12.
What is the function of the transverse filament?
It mediates synapsis and recombination between homologous chromosomes during meiosis.
How is the transverse filament studied?
Using imaging, proteomics, and CRISPR-based genetic models.
What diseases are linked to transverse filament defects?
Infertility, meiotic arrest, and aneuploidy.
Can CRISPR be used to study the transverse filament?
Yes, knockout, knock-in, and point mutation models are widely used.
What is the GO ID for transverse filament?
GO:0000802.
What proteins make up the transverse filament?
SYCP1 forms the core, with SYCE1, SYCE2, SYCE3, and TEX12 as stabilizers.
Is the transverse filament conserved?
Yes, it is conserved from yeast to humans.
How does the transverse filament disassemble?
It disassembles after recombination to allow chromosome segregation.
Conclusion
The transverse filament (GO:0000802) is a critical component of the synaptonemal complex, essential for meiosis and fertility. Understanding its assembly and regulation provides insights into reproductive diseases and potential therapeutic targets. EDITGENE offers advanced CRISPR tools to study these processes efficiently.
References
- 1. Pepe FA et al.. 1986. The myosin filament. X. Observation of nine subfilaments in transverse sections.. Tissue Cell 18(4):499-508 PMID: 3755847
