GO:0140095 cytoplasmic lattice: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140095 cytoplasmic lattice describes fibrous structures of the mammalian ooplasm that store ribosomes and maternal proteins in insoluble form to prevent their degradation, activation and nuclear transfer.
• The cytoplasmic lattice is a mammalian oocyte-specific organelle that safeguards maternal proteins and ribosomes for use during early embryogenesis.
• Key proteins associated with the cytoplasmic lattice include PADI6, NLRP5, TLE6, OOEP, and KHDC3L, which form the subcortical maternal complex (SCMC).
• Recent structural studies have revealed the molecular architecture and assembly principles of the mouse cytoplasmic lattice.
• Disruption of cytoplasmic lattice components is linked to female infertility, early embryonic arrest, and hydatidiform mole.
• CRISPR-based models (knockout, knock-in, overexpression) are essential for dissecting the function of cytoplasmic lattice-associated genes.
Description
The cytoplasmic lattice (GO:0140095) is a fibrous structure found in the ooplasm of mammalian oocytes that stores ribosomes and maternal proteins in an insoluble form, thereby preventing their degradation, premature activation, and nuclear transfer. This organelle is critical for maintaining the maternal reservoir of proteins and ribosomes required for early embryonic development before zygotic genome activation. Understanding the cytoplasmic lattice is essential for researchers studying oocyte maturation, fertilization, and early embryogenesis, as defects in its components are associated with female infertility and early pregnancy loss. Recent advances in structural biology and gene editing have begun to elucidate the molecular composition and assembly of this lattice, opening new avenues for reproductive biology and medicine.
cytoplasmic lattice At A Glance
| GO ID | GO:0140095 |
|---|---|
| GO term | cytoplasmic lattice |
| Ontology | cellular_component |
| Synonym | None |
| Major function | Storage of ribosomes and maternal proteins in insoluble form to prevent degradation, activation and nuclear transfer |
| Cellular location | Ooplasm of mammalian oocytes |
| Associated proteins | PADI6, NLRP5, TLE6, OOEP, KHDC3L (subcortical maternal complex) |
| Disease relevance | Female infertility, early embryonic arrest, hydatidiform mole |
What Is GO:0140095?
The cytoplasmic lattice is defined as fibrous structures of the mammalian ooplasm that store ribosomes and maternal proteins in insoluble form to prevent their degradation, activation and nuclear transfer. This definition highlights its dual role as a storage compartment and a protective mechanism for maternal factors during oocyte maturation and early embryogenesis.
Why Is cytoplasmic lattice Important in Cell Biology?
The cytoplasmic lattice is important because it ensures the preservation of maternal proteins and ribosomes that are essential for early embryonic development. Without this lattice, maternal factors could be prematurely degraded or activated, leading to developmental failure. Moreover, mutations in genes encoding cytoplasmic lattice components are associated with human reproductive disorders, making it a focal point for infertility research.
• Maintains maternal protein and ribosome stores for early embryogenesis.
• Prevents premature degradation and activation of maternal factors.
• Its components are linked to female infertility and recurrent pregnancy loss.
• Serves as a model for studying insoluble protein storage in cells.
• Structural insights may inform reproductive medicine and assisted reproduction.
• CRISPR editing of lattice genes helps model human reproductive diseases.
• Potential target for contraceptive development.
• Relevant to understanding hydatidiform mole and other gestational disorders.
Core Biology of the Cytoplasmic Lattice
What Happens During cytoplasmic lattice Assembly?
In simple terms: The cytoplasmic lattice forms as a fibrous network in the oocyte cytoplasm, capturing ribosomes and maternal proteins into an insoluble storage form.
During oocyte maturation, the cytoplasmic lattice assembles from component proteins, notably those of the subcortical maternal complex (SCMC), including PADI6, NLRP5, TLE6, OOEP, and KHDC3L. These proteins self-assemble into fibrous structures that sequester ribosomes and maternal proteins, preventing their degradation and premature activation. Recent structural studies have provided insights into the molecular basis of this assembly, revealing how these proteins interact to form the lattice.
Structure and Composition of cytoplasmic lattice
In simple terms: The lattice is made of a network of proteins that form fibers, with ribosomes and other maternal factors embedded within.
The cytoplasmic lattice is composed of a proteinaceous fibrous network primarily formed by SCMC components such as PADI6, NLRP5, TLE6, OOEP, and KHDC3L. These proteins assemble into a lattice-like structure that is insoluble and resistant to degradation. The lattice also contains ribosomes and maternal proteins, which are stored in an inactive state. Recent cryo-electron microscopy studies have revealed the high-resolution structure of the mouse cytoplasmic lattice, showing a repeating unit that accommodates ribosomes.
Molecular Mechanism of cytoplasmic lattice Function
In simple terms: The lattice works by physically trapping ribosomes and proteins, keeping them inactive until needed after fertilization.
The molecular mechanism of the cytoplasmic lattice involves the sequestration of ribosomes and maternal proteins into an insoluble matrix, which prevents their degradation and premature activation. This storage is reversible; upon fertilization, the lattice disassembles, releasing the stored components for translation and other processes required for early embryonic development. The assembly and disassembly are likely regulated by post-translational modifications and interactions with other cellular machinery, though the exact triggers remain under investigation.
Regulation of cytoplasmic lattice Dynamics
In simple terms: The lattice is dynamically regulated during oocyte maturation and after fertilization, ensuring proper timing of protein release.
The dynamics of the cytoplasmic lattice are regulated during oocyte maturation and early embryogenesis. Hormonal signals and cell cycle cues may influence its assembly, while fertilization triggers its disassembly. The SCMC proteins are subject to post-translational modifications that could modulate lattice stability. However, the precise regulatory pathways are still being elucidated, and further research is needed to understand how the lattice responds to developmental signals.
Key Genes Involved in GO:0140095 cytoplasmic lattice
The following genes encode proteins that are major components or regulators of the cytoplasmic lattice, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PADI6 | Core component of the subcortical maternal complex and cytoplasmic lattice; involved in lattice assembly and stability | Mutations linked to female infertility and early embryonic arrest |
| NLRP5 | Component of the SCMC; essential for lattice formation and maternal protein storage | Associated with reproductive failure and hydatidiform mole |
| TLE6 | SCMC component; contributes to lattice structure and function | Implicated in early embryonic lethality |
| OOEP | SCMC component; required for lattice assembly and maternal factor storage | Knockout leads to developmental defects |
| KHDC3L | SCMC component; involved in lattice integrity | Mutations associated with recurrent hydatidiform mole |
| NLRP2 | Related to NLRP5; may play a role in lattice-associated functions | Potential involvement in reproductive disorders |
| NLRP7 | SCMC-related; implicated in maternal storage and early development | Mutations cause familial hydatidiform mole |
| NLRP9 | Oocyte-specific NLRP; may associate with lattice | Under investigation for roles in fertility |
| NLRP14 | Oocyte-specific; potential lattice-associated protein | Candidate for fertility studies |
| ZAR1 | Oocyte-specific factor; may interact with lattice components | Knockout causes early embryonic arrest |
| NPM2 | Nucleolar protein; may be stored on lattice | Involved in maternal histone storage |
| HSF1 | Stress-responsive transcription factor; may regulate lattice genes | Potential link to stress and fertility |
| YBX1 | RNA-binding protein; may be stored on lattice | Implicated in maternal mRNA regulation |
| MSY2 | RNA-binding protein; stored in oocyte cytoplasm | Role in maternal mRNA stability |
| DDX3 | RNA helicase; may be associated with lattice | Potential function in translational control |
| EIF4E | Translation initiation factor; may be stored on lattice | Key for maternal translation control |
| PABPC1 | Poly(A)-binding protein; stored in oocytes | Involved in maternal mRNA translation |
| RPL10 | Ribosomal protein; stored on lattice | Component of stored ribosomes |
How Is cytoplasmic lattice Regulated?
The cytoplasmic lattice is regulated during oocyte maturation and after fertilization. Its assembly is promoted by the SCMC proteins, while disassembly is triggered by fertilization, likely through post-translational modifications and signaling pathways. Hormonal cues and cell cycle regulators may also influence lattice dynamics, but the precise mechanisms remain to be fully defined.
cytoplasmic lattice and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PADI6 | Female infertility, early embryonic arrest | Knockout mouse, point mutation knock-in |
| NLRP5 | Hydatidiform mole, infertility | Knockout mouse, overexpression |
| TLE6 | Early embryonic lethality | Conditional knockout, tagged knock-in |
| OOEP | Developmental defects | Knockout mouse, rescue experiments |
| KHDC3L | Recurrent hydatidiform mole | Knock-in of patient mutations |
Female Infertility and Early Embryonic Arrest
Mutations in genes encoding cytoplasmic lattice components, such as PADI6, NLRP5, TLE6, OOEP, and KHDC3L, have been associated with female infertility and early embryonic arrest. These mutations disrupt lattice assembly or function, leading to improper storage of maternal proteins and ribosomes, which impairs early embryonic development.
Hydatidiform Mole
Defects in cytoplasmic lattice-associated genes, particularly NLRP5 and KHDC3L, are linked to recurrent hydatidiform mole, a gestational trophoblastic disease characterized by abnormal placental development. The lattice's role in maternal factor storage is critical for normal fertilization and early development, and its disruption can lead to this condition.
Reproductive Disorders and Assisted Reproduction
Understanding the cytoplasmic lattice has implications for assisted reproductive technologies, as lattice abnormalities may contribute to implantation failure and pregnancy loss. Screening for mutations in lattice genes could improve diagnosis and counseling for affected families.
From cytoplasmic lattice-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of PADI6 in lattice assembly? | Padi6 knockout mouse oocytes |
| How do patient mutations in NLRP5 affect lattice function? | NLRP5 point mutation knock-in mouse |
| Can wild-type PADI6 rescue lattice defects? | Overexpression of PADI6 in knockout oocytes |
| Where is TLE6 localized within the lattice? | TLE6 tagged knock-in with fluorescent reporter |
| What proteins are stored on the lattice? | Proteomics of isolated lattices from wild-type and knockout oocytes |
| How does the lattice disassemble after fertilization? | Live imaging of tagged lattice components |
How to Study the cytoplasmic lattice Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Proteomics | Protein composition of isolated lattices | Identifying stored maternal proteins |
| Cryo-EM | High-resolution structure of the lattice | Understanding assembly and ribosome binding |
| Fluorescence microscopy | Localization and dynamics of lattice components | Live imaging of lattice disassembly |
| Ribo-seq | Translational efficiency of maternal mRNAs | Assessing impact of lattice on translation |
| RNA-seq | Transcript abundance and stability | Measuring maternal mRNA degradation |
| CRISPR knockout | Gene function in vivo | Modeling human mutations |
| CRISPR knock-in | Precise mutation introduction | Studying patient-specific variants |
| Overexpression | Gain-of-function effects | Rescue experiments |
Proteomics and Mass Spectrometry
Proteomic analysis of isolated cytoplasmic lattices can identify the full complement of stored proteins and ribosomes. Mass spectrometry-based approaches have revealed that the lattice stores a specific set of maternal proteins, including ribosome subunits and RNA-binding proteins.
Imaging and Structural Biology
Advanced imaging techniques, such as cryo-electron microscopy and fluorescence microscopy, have been used to visualize the cytoplasmic lattice and its components. These methods have provided insights into the lattice's fibrous architecture and its interaction with ribosomes.
Transcriptomics and Ribo-seq
RNA sequencing and ribosome profiling (Ribo-seq) can measure the impact of lattice disruption on maternal mRNA translation and stability. These techniques help determine how the lattice regulates the translational landscape during oocyte maturation and early embryogenesis.
CRISPR-Based Functional Genomics
CRISPR knockout and knock-in models are essential for testing the function of lattice-associated genes in vivo. These models allow researchers to dissect the roles of individual components in lattice assembly, stability, and function.
How CRISPR Can Be Used to Study GO:0140095 cytoplasmic lattice
Knockout
CRISPR knockout of cytoplasmic lattice genes, such as Padi6 or Nlrp5, in mouse models has demonstrated their essential roles in lattice assembly and female fertility. These models recapitulate human infertility phenotypes and provide a platform for mechanistic studies.
Point Mutation
Introducing patient-specific point mutations into lattice genes using CRISPR base editing or homology-directed repair allows researchers to study the functional consequences of these variants. Such models can reveal how single amino acid changes affect lattice stability and function.
Knock-in
Knock-in of tagged versions of lattice proteins, such as fluorescent reporters, enables live imaging and biochemical isolation of the lattice. This approach helps track lattice dynamics during oocyte maturation and fertilization.
Overexpression
Overexpression of wild-type or mutant lattice components can test sufficiency and dominance effects. For example, overexpressing PADI6 in knockout oocytes can rescue lattice defects, confirming its central role.
How EDITGENE Supports cytoplasmic lattice Research
Researchers studying cytoplasmic lattice-related genes often need to determine whether a candidate gene is causally involved in lattice assembly, stability, or function. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research, from gene knockout to precise point mutations and overexpression models.
Contact EDITGENE today to design your custom CRISPR model for cytoplasmic lattice research.
Frequently Asked Questions About cytoplasmic lattice
What is the cytoplasmic lattice?
The cytoplasmic lattice (GO:0140095) is a fibrous structure in the ooplasm of mammalian oocytes that stores ribosomes and maternal proteins in an insoluble form to prevent their degradation, activation and nuclear transfer.
What genes are involved in the cytoplasmic lattice?
Key genes include PADI6, NLRP5, TLE6, OOEP, and KHDC3L, which encode components of the subcortical maternal complex that forms the lattice.
What is the function of the cytoplasmic lattice?
It stores maternal proteins and ribosomes in an inactive, insoluble state, protecting them from degradation until they are needed after fertilization for early embryonic development.
How is the cytoplasmic lattice assembled?
The lattice assembles from SCMC proteins, which self-organize into a fibrous network that sequesters ribosomes and maternal proteins.
What diseases are associated with cytoplasmic lattice defects?
Mutations in lattice genes are linked to female infertility, early embryonic arrest, and hydatidiform mole.
How can CRISPR be used to study the cytoplasmic lattice?
CRISPR knockout, knock-in, and overexpression models allow researchers to dissect the function of lattice genes in oocyte maturation and fertility.
What is the structure of the cytoplasmic lattice?
Recent cryo-EM studies have revealed a repeating fibrous architecture that accommodates ribosomes and maternal proteins.
Is the cytoplasmic lattice present in all species?
It is specific to mammalian oocytes; its components and functions have been characterized primarily in mice and humans.
What proteins are stored on the cytoplasmic lattice?
Proteomic studies have identified ribosome subunits, RNA-binding proteins, and other maternal factors stored on the lattice.
How does the cytoplasmic lattice disassemble?
Upon fertilization, the lattice disassembles, releasing stored components for translation and early development, though the exact triggers are still under investigation.
Conclusion
The cytoplasmic lattice (GO:0140095) is a unique and essential organelle in mammalian oocytes that safeguards maternal proteins and ribosomes for early embryogenesis. Its discovery has reshaped our understanding of maternal storage and reproductive biology, with direct implications for infertility and gestational diseases. Continued research using CRISPR models and advanced imaging will further unravel its assembly, regulation, and roles in development.
References
- 1. Giaccari C et al.. 2024. New insights into oocyte cytoplasmic lattice-associated proteins.. Trends Genet 40(10):880-890 PMID: 38955588
- 2. Jentoft IMA et al.. 2023. Mammalian oocytes store proteins for the early embryo on cytoplasmic lattices.. Cell 186(24):5308-5327.e25 PMID: 37922900
- 3. Chi P et al.. 2026. Structure of the mouse cytoplasmic lattice.. Nature 654(8118):523-531 PMID: 41917274
- 4. Liu S et al.. 2026. Molecular basis of oocyte cytoplasmic lattice assembly.. Nature 654(8118):532-540 PMID: 41845018
