GO:1905198 manchette assembly: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1905198 manchette assembly describes the aggregation, arrangement and bonding together of components to form the manchette, a transient microtubule-based structure essential for spermatid head shaping and flagellum formation.
• The manchette is a skirt-like microtubule array that surrounds the spermatid nucleus and mediates intra-manchette transport (IMT) of cargo proteins required for acrosome biogenesis and tail assembly.
• Disruption of manchette assembly causes severe sperm morphological defects, including abnormal acrosome biogenesis, malformed heads, and defective flagella, leading to male infertility in humans and mice.
• Key genes implicated in manchette assembly include IQCN, MYCBPAP, DNALI1, CAMSAP1, and components of the MEIG1/PACRG complex, each contributing to microtubule dynamics or cargo transport.
• Experimental models for studying manchette assembly include knockout mice, point-mutation knock-in mice, and patient-derived variants, combined with imaging, proteomics, and CRISPR-based editing.
• Understanding manchette assembly provides insights into spermatogenesis, male fertility, and potential therapeutic targets for asthenoteratozoospermia and fertilization failure.
Description
GO:1905198 manchette assembly is a biological process defined as the aggregation, arrangement and bonding together of a set of components to form the manchette, a transient microtubule-based structure that surrounds the spermatid nucleus during spermiogenesis. The manchette is critical for shaping the sperm head, anchoring the acrosome, and facilitating intra-manchette transport (IMT) of proteins destined for the flagellum. This process is highly conserved among mammals and is essential for normal sperm development and male fertility. Research into manchette assembly has gained prominence because defects in this process are directly linked to severe male infertility phenotypes, including asthenoteratozoospermia, abnormal acrosome biogenesis, and fertilization failure. The manchette serves as a hub for protein trafficking, and its disruption impairs the delivery of cargo required for sperm tail assembly and head shaping. Consequently, understanding the molecular players and regulatory mechanisms of manchette assembly is of significant interest to reproductive biologists and clinicians. This article synthesizes authoritative QuickGO data and verified PubMed literature to provide a comprehensive overview of manchette assembly, covering its definition, key genes, molecular mechanisms, disease relevance, and research methodologies. It is designed to serve as a resource for researchers investigating spermatogenesis and male infertility.
manchette assembly At A Glance
| GO ID | GO:1905198 |
|---|---|
| GO term | manchette assembly |
| Ontology | biological_process |
| Synonym | manchette formation |
| Major function | Formation of a microtubule-based structure that mediates spermatid head shaping and intra-manchette transport |
| Related cellular component | Manchette (microtubule array) |
| Key cellular process | Spermiogenesis / spermatogenesis |
| Associated diseases | Male infertility, asthenoteratozoospermia, fertilization failure |
What Is GO:1905198?
Manchette assembly (GO:1905198) is the biological process in which a set of components aggregates, arranges, and bonds together to form the manchette. The manchette is a specialized, transient microtubule-based structure that forms around the spermatid nucleus during spermiogenesis. This process is synonymous with manchette formation and is essential for proper sperm head shaping, acrosome biogenesis, and flagellum assembly.
Why Is manchette assembly Important in Cell Biology?
Manchette assembly is fundamentally important because it governs a critical step in spermatogenesis that ensures the production of morphologically normal and functionally competent sperm. Defects in this process lead to abnormal sperm head shaping, impaired acrosome formation, and defective flagella, which are common causes of male infertility. Studying manchette assembly provides insights into the molecular basis of male fertility and offers potential targets for diagnostic and therapeutic interventions in reproductive medicine.
• Essential for spermatid head shaping and nuclear condensation during spermiogenesis.
• Required for acrosome biogenesis and anchoring to the nuclear envelope.
• Facilitates intra-manchette transport (IMT) of proteins destined for the sperm flagellum.
• Disruption causes asthenoteratozoospermia and severe sperm morphological defects.
• Mutations in manchette-related genes lead to fertilization failure and male infertility.
• Serves as a model for studying microtubule dynamics and cargo transport in polarized cells.
• Provides insights into evolutionarily conserved mechanisms of spermatogenesis across mammals.
• Offers potential biomarkers and therapeutic targets for male infertility diagnosis.
• Enables research on gene-environment interactions affecting reproductive health.
• Contributes to understanding of cytoskeletal organization and membrane trafficking.
What Happens During manchette assembly?
Initiation and Nucleation of Manchette Microtubules
In simple terms: The manchette starts to form when microtubules begin to assemble around the spermatid nucleus.
Manchette assembly begins with the nucleation of microtubules near the spermatid nucleus, a process that involves the aggregation of tubulin dimers and microtubule-associated proteins. The manchette is a transient structure that emerges during the elongation phase of spermiogenesis, and its formation is dependent on the coordinated action of microtubule nucleation factors and stabilizing proteins. CAMSAP1, a protein that regulates microtubule minus-end dynamics, has been shown to orchestrate the structure and dynamics of manchette microtubules, impacting male fertility.
Elongation and Organization of the Manchette
In simple terms: The microtubules grow and arrange into a skirt-like structure around the nucleus.
Following nucleation, manchette microtubules elongate and organize into a characteristic skirt-like array that surrounds the spermatid nucleus. This organization is critical for the manchette's function in head shaping and cargo transport. The MEIG1/PACRG complex interacts with DNALI1 within the manchette and is required for proper sperm flagellum assembly, indicating that specific protein complexes regulate manchette elongation and stability. The acrosome-acroplaxome-manchette complex further links the manchette to the developing acrosome, ensuring coordinated development.
Intra-Manchette Transport (IMT) of Cargo Proteins
In simple terms: The manchette acts like a conveyor belt, moving proteins to where they are needed for tail formation.
Once formed, the manchette serves as a track for intra-manchette transport (IMT), a process that delivers proteins and vesicles to the developing flagellum. IMT is essential for the assembly of the sperm tail and the transport of acrosomal components. Disruption of IMT leads to defective flagellum assembly and abnormal sperm morphology. MYCBPAP, a protein associated with the manchette, is involved in this transport process, and its deficiency results in abnormal acrosome biogenesis and sperm tail assembly defects.
Disassembly and Transition to Tail Formation
In simple terms: After the manchette has done its job, it disassembles to allow the tail to complete its formation.
The manchette is a transient structure that disassembles after spermatid elongation. This disassembly is tightly regulated and coincides with the completion of flagellum assembly. Defects in manchette disassembly or persistence can lead to sperm morphological abnormalities. IQCN disruption causes a manchette assembly defect that results in fertilization failure and male infertility, highlighting the importance of proper manchette dynamics. The precise timing of disassembly is crucial for normal sperm development.
Key Genes Involved in GO:1905198 manchette assembly
The following genes and proteins have been experimentally implicated in manchette assembly and related processes in humans and mice.
| Gene | Major Role | Research Relevance |
|---|---|---|
| IQCN | Manchette assembly and sperm head shaping | Disruption causes fertilization failure and male infertility due to manchette assembly defect |
| MYCBPAP | Acrosome biogenesis, manchette structure, and sperm tail assembly | Homozygous deleterious variants induce asthenoteratozoospermia in humans and mice |
| DNALI1 | Interacts with MEIG1/PACRG complex within the manchette | Required for proper sperm flagellum assembly in mice |
| CAMSAP1 | Regulates microtubule minus-end dynamics in the manchette | Impacts male fertility during spermiogenesis |
| MEIG1 | Component of MEIG1/PACRG complex in the manchette | Required for sperm flagellum assembly and manchette function |
| PACRG | Component of MEIG1/PACRG complex in the manchette | Required for sperm flagellum assembly and manchette function |
| SPAG16 | Manchette-associated protein involved in flagellar assembly | Implicated in sperm motility and male fertility |
| AKAP4 | Fibrous sheath protein, indirectly linked to manchette function | Marker of sperm tail assembly |
| ODF2 | Outer dense fiber protein, related to manchette cargo transport | Involved in sperm tail structure |
| IFT20 | Intraflagellar transport protein, may interact with manchette | Role in cargo delivery during spermiogenesis |
| KIF3A | Kinesin motor protein for intra-manchette transport | Required for protein trafficking in spermatids |
| KIF17 | Kinesin motor protein for intra-manchette transport | Required for protein trafficking in spermatids |
| TUBB | Tubulin beta, building block of manchette microtubules | Essential for microtubule formation |
| TUBA | Tubulin alpha, building block of manchette microtubules | Essential for microtubule formation |
| MAP1S | Microtubule-associated protein, stabilizes manchette | Involved in microtubule dynamics |
| MAPRE1 | Microtubule plus-end tracking protein | Potential regulator of manchette microtubules |
| HOOK1 | Microtubule-binding protein, links manchette to cargo | Implicated in spermatid transport |
How Is manchette assembly Regulated?
Manchette assembly is regulated by a combination of microtubule-associated proteins, motor proteins, and signaling pathways that control cytoskeletal dynamics. CAMSAP1 regulates the structure and dynamics of manchette microtubule minus-ends, and its disruption impacts male fertility. The MEIG1/PACRG complex interacts with DNALI1 to regulate manchette function and flagellum assembly. Additionally, intra-manchette transport is dependent on kinesin motor proteins, which are regulated by cargo adaptors and phosphorylation events. Hormonal regulation, particularly testosterone signaling, also influences manchette formation during spermiogenesis.
manchette assembly and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| IQCN | Fertilization failure and male infertility due to manchette assembly defect | Iqcn knockout mouse, patient-derived iPSCs |
| MYCBPAP | Asthenoteratozoospermia with abnormal acrosome biogenesis and sperm tail assembly | Mycbpap knockout mouse, knock-in of patient variants |
| DNALI1 | Defective sperm flagellum assembly and male infertility | Dnali1 knockout mouse, point-mutation knock-in |
| CAMSAP1 | Impaired male fertility due to manchette microtubule defects | Camsap1 knockout mouse, overexpression models |
| MEIG1/PACRG | Sperm flagellum assembly defects and male infertility | Meig1 or Pacrg knockout mice, rescue experiments |
Male Infertility and Asthenoteratozoospermia
Defects in manchette assembly are directly linked to male infertility. Homozygous deleterious variants in MYCBPAP cause asthenoteratozoospermia characterized by abnormal acrosome biogenesis, manchette structure, and sperm tail assembly in humans and mice. IQCN disruption leads to manchette assembly defects, resulting in fertilization failure and male infertility. These findings underscore the clinical importance of manchette assembly in reproductive medicine.
Fertilization Failure
Manchette assembly defects can cause fertilization failure due to sperm morphological abnormalities that impair the ability of sperm to penetrate the egg. IQCN disruption specifically results in fertilization failure and male infertility due to manchette assembly defect. This highlights the need for genetic screening of manchette-related genes in infertile men.
Sperm Flagellum Assembly Defects
Proper manchette function is required for sperm flagellum assembly. DNALI1 interacts with the MEIG1/PACRG complex within the manchette and is required for proper sperm flagellum assembly in mice. Disruption of this complex leads to defective flagella and impaired sperm motility, contributing to male infertility.
From manchette assembly-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of IQCN cause manchette assembly defects? | Iqcn knockout mouse and patient-derived cells |
| Do MYCBPAP variants lead to asthenoteratozoospermia? | Mycbpap knock-in mouse carrying patient variants |
| How does DNALI1 interact with MEIG1/PACRG? | Dnali1 knockout and tagged knock-in mouse |
| What is the role of CAMSAP1 in microtubule dynamics? | Camsap1 knockout and overexpression cell models |
| Can overexpression of manchette proteins rescue fertility? | Transgenic overexpression mouse models |
| What are the downstream targets of manchette assembly? | Proteomics and transcriptomics of knockout models |
How to Study the manchette assembly Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Immunofluorescence microscopy | Manchette morphology and protein localization | Assessing manchette assembly defects in spermatids |
| Transmission electron microscopy | Ultrastructure of manchette and acrosome | Detailed structural analysis |
| Co-immunoprecipitation | Protein-protein interactions | Mapping MEIG1/PACRG/DNALI1 complex |
| Mass spectrometry proteomics | Protein composition and modifications | Identifying manchette-associated proteins |
| Single-cell RNA-seq | Gene expression profiles | Discovering novel manchette genes |
| CRISPR/Cas9 knockout | Gene function loss | Creating manchette gene knockout models |
| CRISPR/Cas9 knock-in | Patient variant modeling | Recapitulating human mutations |
| Overexpression transgenics | Gain-of-function effects | Testing rescue or sufficiency |
Imaging of Manchette Structure
Fluorescence and electron microscopy are essential for visualizing manchette assembly and defects. Immunostaining for tubulin and manchette-associated proteins such as DNALI1 and CAMSAP1 allows researchers to assess microtubule organization and manchette morphology in spermatids. Transmission electron microscopy provides ultrastructural details of the manchette and acrosome-acroplaxome complex.
Proteomics and Interactomics
Mass spectrometry-based proteomics can identify proteins associated with the manchette and their post-translational modifications. Co-immunoprecipitation and yeast two-hybrid assays have been used to map interactions between MEIG1, PACRG, and DNALI1. These methods help elucidate the molecular composition and dynamics of the manchette.
Transcriptomics and Single-Cell RNA Sequencing
RNA sequencing of testicular cells at different stages of spermatogenesis can reveal gene expression changes associated with manchette assembly. Single-cell RNA-seq has been used to profile spermatogenic cells and identify novel manchette-related genes. This approach is valuable for discovering regulatory networks.
Genetic Models and CRISPR Editing
Knockout and knock-in mouse models generated by CRISPR/Cas9 are powerful tools for studying manchette assembly. For example, Iqcn knockout mice exhibit manchette defects and infertility, while Mycbpap knock-in mice recapitulate patient phenotypes. These models allow functional validation of candidate genes.
How CRISPR Can Be Used to Study GO:1905198 manchette assembly
Knockout
CRISPR/Cas9-mediated knockout is widely used to study manchette assembly by ablating candidate genes in mice or cell lines. For example, Iqcn knockout mice display manchette assembly defects and male infertility, confirming the gene's essential role. Knockout of Dnali1 in mice impairs sperm flagellum assembly, demonstrating its requirement in manchette function.
Point Mutation
Point mutations identified in patients can be introduced into model organisms using CRISPR/Cas9 to study their impact on manchette assembly. Homozygous deleterious variants in MYCBPAP have been modeled in mice, recapitulating asthenoteratozoospermia phenotypes. Such models help establish causality between specific mutations and manchette defects.
Knock-in
Knock-in of tagged versions of manchette proteins (e.g., GFP or HA tags) allows real-time visualization and biochemical isolation of manchette components. Tagged DNALI1 knock-in mice have been used to study its interaction with the MEIG1/PACRG complex within the manchette. This approach is valuable for tracking protein dynamics during assembly.
Overexpression
Overexpression of manchette-associated genes can reveal gain-of-function phenotypes or rescue defects. For instance, overexpression of CAMSAP1 in cell models has been used to study its role in microtubule minus-end dynamics. Overexpression models complement knockout studies by providing insights into dosage effects.
How EDITGENE Supports manchette assembly Research
Researchers studying manchette assembly-related genes often need to determine whether a candidate gene is causally involved in the process or merely correlated with it. This requires precise genetic manipulation, such as knockout, point mutation, knock-in, or overexpression, coupled with functional assays. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate such investigations.
Contact EDITGENE today to design your custom CRISPR model for manchette assembly research.
Frequently Asked Questions About manchette assembly
What is manchette assembly?
Manchette assembly (GO:1905198) is the biological process of forming the manchette, a transient microtubule-based structure that surrounds the spermatid nucleus and is essential for sperm head shaping and flagellum formation.
What genes are involved in manchette assembly?
Key genes include IQCN, MYCBPAP, DNALI1, CAMSAP1, MEIG1, and PACRG, all of which have been experimentally linked to manchette function and male fertility.
What is the function of the manchette?
The manchette mediates spermatid head shaping, acrosome biogenesis, and intra-manchette transport of proteins required for sperm tail assembly.
How does manchette assembly relate to male infertility?
Defects in manchette assembly cause abnormal sperm morphology, asthenoteratozoospermia, and fertilization failure, leading to male infertility.
What diseases are associated with manchette assembly defects?
Diseases include asthenoteratozoospermia, fertilization failure, and other forms of male infertility.
What model organisms are used to study manchette assembly?
Mice are the primary model, with knockout and knock-in models for genes like Iqcn, Mycbpap, and Dnali1.
How can CRISPR be used to study manchette assembly?
CRISPR/Cas9 enables knockout, point mutation, knock-in, and overexpression of manchette-related genes in cells and mice to dissect their functions.
What methods visualize the manchette?
Immunofluorescence and electron microscopy are commonly used to visualize manchette structure and defects.
Is manchette assembly conserved across species?
Yes, manchette assembly is conserved among mammals, including humans, mice, and bovines.
What is intra-manchette transport?
Intra-manchette transport (IMT) is the process by which the manchette facilitates the movement of proteins and vesicles to the developing sperm flagellum.
Conclusion
Manchette assembly (GO:1905198) is a critical biological process in spermatogenesis, responsible for forming a transient microtubule structure that shapes the sperm head and enables flagellum assembly. Defects in this process lead to severe male infertility, underscoring its clinical relevance. Continued research using CRISPR-based models and advanced imaging will further elucidate the molecular mechanisms and identify therapeutic targets. EDITGENE provides comprehensive CRISPR services to support manchette assembly research, from knockout and knock-in models to library screening and bioinformatics, empowering discoveries in reproductive biology.
References
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- 2. Zhou Y et al.. 2025. Homozygous deleterious variants in MYCBPAP induce asthenoteratozoospermia involving abnormal acrosome biogenesis, manchette structure and sperm tail assembly in humans and mice.. Sci China Life Sci 68(3):777-792 PMID: 39704931
- 3. Lehti MS et al.. 2016. Formation and function of the manchette and flagellum during spermatogenesis.. Reproduction 151(4):R43-54 PMID: 26792866
- 4. Yap YT et al.. 2023. DNALI1 interacts with the MEIG1/PACRG complex within the manchette and is required for proper sperm flagellum assembly in mice.. Elife 12 PMID: 37083624
- 5. Barth A et al.. 2025. Bovine Spermatogenesis.. Adv Anat Embryol Cell Biol 240:65-136 PMID: 40272587
- 6. Dai J et al.. 2022. IQCN disruption causes fertilization failure and male infertility due to manchette assembly defect.. EMBO Mol Med 14(12):e16501 PMID: 36321563
- 7. Kierszenbaum AL et al.. 2004. The acrosome-acroplaxome-manchette complex and the shaping of the spermatid head.. Arch Histol Cytol 67(4):271-84 PMID: 15700535
- 8. Hu W et al.. 2023. CAMSAP1 role in orchestrating structure and dynamics of manchette microtubule minus-ends impacts male fertility during spermiogenesis.. Proc Natl Acad Sci U S A 120(45):e2313787120 PMID: 37903275
