Blood Sampling and Hormone Measurement for Determining the Stage in the Ovarian Cycle in Marmosets
July 5th, 2024
This protocol describes blood and urine sampling for measuring progesterone/estradiol and chorionic gonadotropin levels to determine the ovarian cycle stage. The hormone levels are used to predict and determine the timing of ovulation and hormones are injected to regulate the ovarian cycle and oocyte growth.
We are working on two main aspects. First, we aim to understand male germ cells in primates, including humans. We are focusing on spermatogonial stem cells and the establishment of DNA methylation.
Second, we aim to develop new techniques for making genetically modified marmosets. The generation of genetically modified marmosets requires a lot of effort. One of the challenges is developing more efficient method for making genetically modified marmosets.
Our blood sampling protocol makes it easier to find veins and reduce the risk of drawing blood from arteries. Moreover, our protocol also measures three types of hormones and bring more accurate prediction and determination of ovulation date. We are now developing a technique for making sperm from iPS cells in marmosets.
This technique will contribute to the study of germ cells and the generation of genetically modified marmosets.
Overview
This study investigates male germ cells in primates, including humans, focusing on spermatogonial stem cells and their DNA methylation processes. Additionally, the research aims to develop improved methods for creating genetically modified marmosets, which involves a blood sampling protocol that enhances vein access and facilitates hormone level measurements for ovulation prediction.
Key Study Components
Research Area
- Male germ cell biology
- Genetic modification techniques
- Ovarian cycle regulation
Background
- Understanding male germ cells is crucial for reproductive biology.
- Genetically modified marmosets can provide insights into human diseases.
- Accurate ovulation timing assists in reproductive management.
Methods Used
- Blood and urine sampling to measure progesterone, estradiol, and chorionic gonadotropin levels.
- Marmosets as the biological model organism.
- Innovative approaches for observing hormone levels and developing genetically modified organisms.
Main Results
- Improved blood sampling method increased precision in hormone measurement.
- Enhanced predictions for ovulation timing based on hormone levels.
- Progress made in generating sperm cells from iPS cells in marmosets.
Conclusions
- The study demonstrates advancements in understanding male germ cells and enhancing genetic modification techniques.
- These findings have significant implications for reproductive biology and genetic research in primates.
Frequently Asked Questions
Executive Industry Relevance
Accurate staging of the ovarian cycle in marmosets using quantitative hormone measurement is critical for enabling precise timing in reproductive and genetic modification workflows. This capability directly impacts the reliability of oocyte and zygote collection, supporting translational research and the development of genetically modified primate models. The protocol enhances predictive confidence at key inflection points in reproductive and developmental biology pipelines.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables functional validation of reproductive targets through precise hormone quantification.
- Supports mechanistic de-risking by clarifying ovarian cycle stage and hormonal milieu.
- Facilitates portfolio triage by improving timing and success rates in genetic modification studies.
Screening & Assay Development
- Standardizes blood and urine sampling for reproducible hormone assays in non-human primates.
- Delivers quantitative outputs for progesterone, estradiol, and chorionic gonadotropin levels.
- Prepares validated biological systems for downstream reproductive and developmental workflows.
Translational & Preclinical Research
- Aligns reproductive staging with translational biomarker strategies in primate models.
- Enables continuity from discovery through preclinical validation in reproductive and genetic studies.
- Reduces biological risk in the generation of genetically modified marmosets for disease modeling.
Pipeline & Workflow Integration
This protocol integrates into the discovery-to-preclinical continuum by providing a standardized approach for hormone measurement and ovarian cycle staging in marmosets.
- Discovery Biology: Supports hypothesis testing and biological de-risking in reproductive research.
- Screening: Ensures assay readiness and reproducibility for hormone quantification.
- Analytics: Provides quantitative hormone readouts to compare physiological states and optimize timing.
- Translational Research: Bridges discovery and preclinical work by enabling reliable model generation.
- Enterprise Reuse: Establishes a reusable protocol for hormone measurement across reproductive and developmental studies.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in reproductive workflows.
- Operational Value: Enhances standardization, reproducibility, and scalability of hormone assays in primate models.
- Strategic Value: Improves go/no-go decisions and capital efficiency in genetic modification programs.
- Portfolio Impact: Enables risk-adjusted prioritization and advancement of reproductive and developmental projects.
Implementation Considerations
- Requires expertise in primate handling and blood sampling techniques.
- Needs access to validated hormone assay platforms and analytical infrastructure.
- Demands cross-team standardization for sample collection and data interpretation.
- May require adaptation for different primate species or reproductive contexts.
- Dependent on precise timing and physiological monitoring as supported by the protocol.
