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Technische Universität München

Chickens and pigs with integrated genetic scissors: Genome editing in farm animals

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Genome editing in farm animals

Chickens and pigs with integrated genetic scissors

Genetically engineered animals provide important insights into the molecular basis of health and disease. Research has focused mainly on genetically modified mice, although other species, such as pigs, are more similar to human physiology. Researchers at the Technical University of Munich (TUM) have now generated chickens and pigs in which target genes in desired organs can be efficiently altered.

Researchers at the TUM have demonstrated a way to efficiently study molecular mechanisms of disease resistance or biomedical issues in farm animals. Researchers are now able to introduce specific gene mutations into a desired organ or even correct existing genes without creating new animal models for each target gene. This reduces the number of animals required for research..

CRISPR/Cas9 enables desired gene manipulations

CRISPR/Cas9 is a tool to rewrite DNA information. Genes can be inactivated or specifically modified using this method. The CRISPR/Cas9 system consists of two components.

The gRNA (guide RNA) is a short sequence that binds specifically to the DNA segment of the gene that is to be modified. The Cas9 nuclease, the actual "gene scissors", binds to the gRNA and cuts the respective section of the target DNA. This cut activates repair mechanisms that can inactivate gene function or incorporate specific mutations.

Healthy chickens and pigs with integrated gene scissors

"The generated animals provide the gene scissors, the Cas9 protein, right along with them. So all we have to do is to introduce the guide RNAs to get animals which have specific genetic characteristics," explains Benjamin Schusser, Professor of Reproductive Biotechnology at the TUM. "The initial generation of these animals took about three years. Cas9 can now be used at all stages of animal development, since every cell in the body permanently possesses the Cas9 protein. We have been successfully able to utilize this technique in chicken embryos as well as in living pigs."

The healthy chickens and pigs produced by the researchers thus possess the Cas9 nuclease in all organs studied. This is particularly useful in biomedical and agricultural research.

Analytical tool to fight viral or cancer diseases

Pigs are used as disease models for humans because their anatomy and physiology are much more similar to humans in comparison to mice (currently a common disease model). Thus, a modified pig may help to better understand the mechanism of carcinogenesis in humans. Potential new treatments for humans can also be tested in animal models.

"Due to the presence of Cas9 in the cells the processes are significantly accelerated and simplified," says Angelika Schnieke, Professor of Livestock Biotechnology at the TUM. "Cas9-equipped animals make it possible, for example, to specifically inactivate tumor-relevant genes and to simulate cancer development."

Cas9 pigs and chickens enable researchers to test which genes might be involved in the formation of traits, such as disease resistance, directly in the animal. "The mechanism of the CRISPR/Cas9 system may also be useful for combating infections using DNA viruses. Initial cell culture experiments showed that this already works for the avian herpes virus," says Prof. Schusser.

Important resource for biomedical and agricultural research

Prof. Schnieke notes, "Our Cas9-expressing chickens and pigs represent an innovative resource for genome editing in the biomedical and agricultural sciences, but beyond that, these animals are also available to other research groups. Hence, efficient genome editing in living animals has the potential to significantly advance biomedical and agricultural research.”


Beate Rieblinger, Hicham Sid, Denise Duda, Tarik Bozoglu, Romina Klinger, Antonina Schlickenrieder, Kamila Lengyel, Krzysztof Flisikowski, Tatiana Flisikowska, Nina Simm, Alessandro Grodziecki, Carolin Perleberg, Andrea Bähr, Lucie Carrier, Mayuko Kurome, Valeri Zakhartchenko, Barbara Kessler, Eckhard Wolf, Lutz Kettler, Harald Luksch, Ibrahim T. Hagag, Daniel Wise, Jim Kaufman, Benedikt B. Kaufer, Christian Kupatt, Angelika Schnieke, and Benjamin Schusser (2021): Cas9-expressing chickens and pigs as resources for genome editing in livestock. PNAS March 9, 2021 118 (10) e2022562118

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The research was funded by the German Research Foundation (DFG) and the DZHK (German Center for Cardiovascular Research).

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Prof. Dr. Benjamin Schusser

Technical University of Munich

Chair of Reproductive Biotechnology

Phone: +49.8161.71.2027

Prof. Dr. Angelika E. Schnieke

Technical University of Munich

Chair of Livestock Biotechnology

Phone: +49 8161 71-2005

The Technical University of Munich (TUM) is one of Europe’s leading research universities, with more than 600 professors, 45,000 students, and 11,000 academic and non-academic staff. Its focus areas are the engineering sciences, natural sciences, life sciences and medicine, combined with economic and social sciences. TUM acts as an entrepreneurial university that promotes talents and creates value for society. In that it profits from having strong partners in science and industry. It is represented worldwide with the TUM Asia campus in Singapore as well as offices in Beijing, Brussels, Mumbai, San Francisco, and São Paulo. Nobel Prize winners and inventors such as Rudolf Diesel, Carl von Linde, and Rudolf Mößbauer have done research at TUM. In 2006, 2012, and 2019 it won recognition as a German "Excellence University." In international rankings, TUM regularly places among the best universities in Germany.

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