hACE2 Knock-in Mouse Models for Reliable SARS-CoV-2 Research | Cyagen
Have you ever felt like you were fighting a battle with one hand tied behind your back? For researchers at the forefront of the COVID-19 pandemic, this was a daily reality. The world was desperate for answers—for effective antivirals, for life-saving vaccines—but a fundamental biological obstacle stood in the way: the very virus you were trying to defeat couldn’t reliably infect the standard animal models on your rack.
You knew the mechanism. SARS-CoV-2 uses the human Angiotensin-Converting Enzyme 2 (hACE2) as its primary gateway into our cells. Unfortunately, the mouse version of this receptor, mACE2, has a low binding affinity for the viral spike protein. This simple molecular incompatibility created a monumental research bottleneck. Early attempts to solve this, like using viral vectors to deliver hACE2 transiently, often felt like trading one problem for another. How could you be certain your results weren’t skewed by variable expression levels or an immune response to the delivery vector itself? How much time and funding was being lost to models that couldn't truly replicate the human disease? It was a constant struggle between the urgency of the crisis and the integrity of the science.
Beyond mACE2: Bridging the SARS-CoV-2 Translational Gap
Now, imagine a different research reality. What if that fundamental barrier was simply removed? Picture a preclinical model where the biological handshake between the virus and the host cell occurs just as it does in humans. A model that doesn’t just get “sick,” but recapitulates the specific, systemic, and often devastating pathology of COVID-19, from the lungs to the brain.
Envision starting your next vaccine efficacy or therapeutic study with an animal model that offers stable, predictable, and physiologically relevant hACE2 expression. You could move forward with confidence, knowing that your model provides a faithful translational platform. Instead of wrestling with model limitations, you could focus on answering the critical questions: How does the virus spread through different organ systems? What drives the severe immunopathology? And is your therapeutic candidate truly hitting its mark? This isn't about finding a workaround; it's about building a foundation for discovery.
hACE2 Knock-in Strategy: Precise Expression & Viral Tropism
This vision of a more certain, more rapid path to discovery is enabled by Cyagen’s hACE2 knock-in mice models. We didn’t just create a knockin mouse that expresses the human receptor; we engineered a superior research tool by precisely replacing the mouse Ace2 gene with its human counterpart. This ensures that hACE2 is expressed under the control of the natural mouse promoter, mirroring the physiological distribution and expression levels found in humans. This is the key to unlocking clinically relevant insights.
For researchers like you, this translates into tangible advantages:
- Achieve Efficient and Reliable Viral Entry: Our knock-in strategy ensures the hACE2 receptor is present in the right tissues at the right levels, providing a consistent and dependable platform for SARS-CoV-2 infection studies.
- Faithfully Recapitulate Human Disease: Move beyond simple infection. Our hACE2 mice exhibit hallmark clinical signs of COVID-19, including dose-dependent weight loss, mortality, and the characteristic interstitial pneumonia observed in human patients.
- Investigate Systemic Viral Tropism: With validated viral replication in the lungs, brain, trachea, and intestines, you can finally dissect the multi-organ dissemination that makes COVID-19 so complex and challenging.
- Accelerate Antiviral and Vaccine Development: Choose from models on robust C57BL/6J or BALB/c backgrounds to align with your specific immunological focus, whether you're studying T-cell responses or antibody production. These models are validated and ready to shorten your experimental timeline.
Validated Data: Weight Loss & Lung Pathology in hACE2 Models
For over 17 years, Cyagen has partnered with research labs to overcome complex modeling challenges. When the COVID-19 crisis emerged, we knew our expertise in gene editing could provide the community with the reliable tools it desperately needed. Our hACE2 models were not just developed; they were rigorously validated in collaboration with the scientific community to ensure they would empower, not complicate, your research.
Researchers leveraging our C57BL/6J-hACE2 mice have consistently replicated the severe disease phenotype essential for immunopathology studies. After intranasal infection with SARS-CoV-2, these models demonstrate:
- Significant Weight Loss: A clear and measurable indicator of disease progression, providing a reliable endpoint for therapeutic efficacy testing.
- Dose-Dependent Survival: Allows for fine-tuning infection models to study everything from mild to severe disease outcomes.
- Robust Viral Replication: High viral loads are detected not only in the lungs but systemically, with quantitative data confirming viral titers in the brain, trachea, eyes, and intestines.
- Classic COVID-19 Lung Pathology: Histopathology analyses reveal severe interstitial pneumonia, alveolar damage, and significant inflammatory cell infiltration—a true recapitulation of what clinicians see in human patients.
Recognizing that the immune response is central to COVID-19 outcomes, we also developed the BALB/c-hACE2 model. This gives you the critical ability to study the impact of different immune-response biases (Th1 vs. Th2) on viral clearance, vaccine efficacy, and immunopathology, adding another layer of depth to your investigations. This is the kind of strategic tool we believe researchers deserve.
Accelerate Breakthroughs: Consultation for hACE2 Model Research
The challenge of finding a faithful preclinical model for SARS-CoV-2 has been solved. Now you can move forward with greater speed, clarity, and confidence. The next step in your research journey is a simple one.
Take the next step toward accelerating your COVID-19 research.
Browse Our Validated hACE2 Mouse Models
Or, to discuss your specific project needs and how our models can be tailored to your experimental design, connect with one of our scientific strategists for a complimentary consultation.
