In modern breeding and production systems, knowing the sex of an organism as early as possible is not just useful — it’s transformative.
Across a wide range of agricultural species, from plants like hops and hemp to aquaculture staples such as Amazon tambaqui, sex is directly linked to productivity, quality, and economic return. Whether it’s female plants producing valuable biomass or faster-growing female fish driving yield, early sex identification allows breeders and producers to make smarter, faster decisions.
However, traditional approaches often fall short. Visual identification is slow and unreliable, while many molecular methods require expensive instrumentation, complex workflows, or high reagent costs.
This is where PACE genotyping from 3CR Bioscience provides a step change.
What is PACE — and why is it different?
PACE (PCR Allelic Competitive Extension) is a simple, powerful form of allele-specific PCR that delivers:
- High accuracy SNP genotyping
- Low cost per data point
- Minimal workflow complexity
- Exceptional scalability
Unlike probe-based systems, PACE uses unlabelled primers with a universal fluorescent detection chemistry built into the master mix, making it both cost-effective and easy to implement.
The workflow is straightforward:
- Diagnostic SNP identified
- Custom allele-specific primers designed
- Standard PCR amplification (~30 cycles)
- Fluorescent readout reveals genotype
Importantly, PACE runs on standard qPCR instruments, making it accessible to most molecular labs without the need for specialised platforms.
Built for real-world breeding workflows
PACE is uniquely suited to both early-stage R&D and full-scale production environments:
- Works with rapid DNA extraction methods
- Compatible with 96-, 384-, and 1536-well formats
- Easily integrated into automated, high-throughput pipelines
- Delivers fast turnaround times for large sample volumes
From small breeding programs to ultra-high-throughput screening facilities, PACE scales seamlessly.
Why early sex determination matters
In many species, sex is not phenotypically visible until late in development, creating inefficiencies:
- Wasted space and resources growing unwanted individuals
- Delayed breeding decisions
- Reduced selection intensity
- Increased labour and operational costs
By contrast, early genotypic sex determination enables:
- Targeted planting or stocking
- Optimised use of land, tanks, and facilities
- Faster breeding cycles
- Improved genetic gain
Proven success across key species
PACE genotyping from 3CR Bioscience has already been successfully applied to sex determination in multiple high-value species, supported by robust scientific studies.
Hops (Humulus lupulus)
Hops are dioecious, with only female plants used commercially for cone production. Traditionally, breeders must wait 1–2 years for flowering to determine sex.
Using a highly diagnostic SNP marker:
- ~96% accuracy across diverse germplasm
- Validated in USDA-ARS breeding populations
- Enables early seedling screening
- Supports high-throughput, low-cost workflows
The impact is significant. In applied breeding:
- 254% increase in female selection efficiency
- 97.4% female planting ratios achieved
This translates directly into time, cost, and space savings, while accelerating cultivar development.
Reference: Clare, S. J., King, R. M., Tawril, A. L., Havill, J. S., Muehlbauer, G. J., Carey, S. B., … & Altendorf, K. R. (2024). An affordable and convenient diagnostic marker to identify male and female hop plants. G3: Genes, Genomes, Genetics, 14(1), jkad216.
Cannabis & Hemp (Cannabis sativa)
In Cannabis sativa, early sex identification is essential for both breeding and production.
PACE assays allow:
- Reliable differentiation of XX (female) and XY (male) plants at early stages
- Improved management of crossing blocks and production systems
- Exploration of advanced genetics, such as assessing YY “supermale” viability
This enables breeders to optimise population structure early, rather than reacting later in the growth cycle.
Reference: Toth, J. A., Stack, G. M., Cala, A. R., Carlson, C. H., Wilk, R. L., Crawford, J. L., … & Smart, L. B. (2020). Development and validation of genetic markers for sex and cannabinoid chemotype in Cannabis sativa L. Gcb Bioenergy, 12(3), 213-222.
Amazon Tambaqui (Colossoma macropomum)
In aquaculture, sex-linked traits often drive productivity. In tambaqui:
- Females reach larger harvest sizes
- Sex differences are not visible during early growth stages
PACE-enabled marker panels:
- Achieve 90–96.7% accuracy
- Allow early-stage sex identification
- Improve selection accuracy and genetic gain
This provides a powerful tool for more efficient and profitable breeding programs.
Reference: Varela, E. S., Bekaert, M., Ganeco-Kirschnik, L. N., Torati, L. S., Shiotsuki, L., de Almeida, F. L., … & Migaud, H. (2021). A high-density linkage map and sex-linked markers for the Amazon Tambaqui Colossoma macropomum. BMC genomics, 22(1), 709.
Accessible science, real-world impact
A key advantage of PACE is that many validated SNP markers are already available in the scientific literature, making it easier than ever to implement marker-assisted selection.
Combined with:
- Simple workflows
- Low reagent costs
- Standard lab equipment compatibility
PACE makes advanced genotyping accessible to a much wider range of users. We provide a free assay design service to all our reagents customers and give you full access to your primer sequence designs as well.
Why partner with 3CR Bioscience?
3CR Bioscience is more than a reagent supplier — we are a complete genotyping partner.
We support customers at every stage:
- Assay design tailored to your species and targets
- Workflow optimisation for your throughput needs
- Technical support and troubleshooting
- Supply of reagents, consumables, and instrumentation
Whether you are running a small breeding programme or scaling to millions of data points, we provide the expertise and infrastructure to make it work.
The future of efficient breeding
As breeding programs face increasing pressure to deliver:
- Higher yields
- Greater resilience
- Faster turnaround
Technologies like PACE are becoming essential.
By combining accuracy, affordability, and scalability, PACE genotyping from 3CR Bioscience enables earlier decisions, better resource use, and faster genetic progress.
