TU Dresden announces collaboration with Janssen to advance next-generation nuclease-free gene editing platform

Technical University (TU) Dresden (Germany) announced today that they have entered a research collaboration and license agreement with Janssen Pharmaceuticals, Inc., one of the Janssen Pharmaceutical Companies of Johnson & Johnson, under which they will develop novel therapies by using TU Dresden’s next-generation gene editing technology platform based on site-specific DNA recombinases. The collaboration was facilitated by Johnson & Johnson Innovation.

Several gene editing tools have emerged recently, enabling researchers to modify mammalian genomes in a targeted manner. Scientists led by Professor Frank Buchholz at Technical University Dresden (TU Dresden) have developed a new, next-generation gene editing platform based on engineered, site-specific DNA recombinases that allow for nuclease-free editing of genomic regions with single-base precision. The technology is uniquely versatile as it can perform several genome modifications such as excision of both short and long DNA fragments, gene inversion, and efficient gene insertion. Notably, gene insertion can be performed with comparable efficiency in both dividing and non-dividing cells because recombinases, in contrast to nuclease-based gene editing technologies, edit genomes independent of the host cells’ DNA repair and recombination machinery.

“Collaborating with Janssen is an important step forward in driving the development of our technology and for advancing therapeutic programs for the treatment of a variety of currently incurable diseases towards clinical trials”, said Professor Frank Buchholz, Head of Medical Systems Biology at the Medical Faculty of TU Dresden. “Our gene editing platform offers multiple therapeutic opportunities and we are very happy that we have been able to collaborate with a global company such as Janssen.”

Link to TU Dresden


BMBF GO-Bio Award 2018

The start-up project “RecTech” of Prof. Dr. Frank Buchholz was nominated for the prestigious BMBF GO-Bio award in 2018 comprising a funding volume of over 3 million Euros within the first three years. The high competitive award was granted for an innovative genome-editing project developed in the Buchholz lab. In many years of research, site-specific recombinases (SSRs) have been developed as an efficient and safe genome-surgical tool. SSRs are enzymes that precisely cut and paste DNA at defined target sites. In particular, these designer recombinases can be applied to treat monogenic diseases. Currently more than 8,000 gene alterations are known that trigger monogenic diseases and thus, can be therapeutically addressed by genome editing. The here planned establishment of a SSR platform will foster the development of new gene therapies for many, so far incurable, diseases. With the support of the start-up service “dresden|exists” of the TU Dresden, the team of Prof. Buchholz was able to prepare a promising business concept that convince the reviewers and the expert jury of the anticipated high clinical as well as economic potential of the RechTech project.

Link TU Dresden



Dresden scientists develop a sensor for the most important human cancer gene

Molecular “detector” recognizes most frequent cancer-mutation in cells and initiates to kill them

If it burns in a house smoke detectors alert us hence protecting life. A molecular smoke alert has now been developed by Dresden researchers for the TP53 gene, the most important human cancer gene. The alert goes on if the TP53 gene is mutated in cells. The molecular smoke detector works like a TP53 sensor, which monitors the correct function of the gene. A non-functional TP53 gene is going to activate the sensor, which initiates cell death. Results from this study from the research team of Prof. Frank Buchholz are now published in the journal „Nature Communications“.

Cancer is caused by changes in the human genome. Mutations in oncogenes and in tumor suppressor genes accumulate unrecognized over time and lead to uncontrolled cell proliferation eventually. In 50% of all human tumors the tumor suppressor gene TP53 is no longer functional being the most frequently mutated cancer gene. Scientists from the Universitäts KebsCentrum UCC at the  Universitätsklinikum Carl Gustav Carus, the Nationalen Centrum für Tumorerkrankungen NCT Dresden and the Deutsches Konsortium für Translationale Krebsforschung DKTK Dresden concluded that the formation of a TP53 sensor could suppress tumor formation at a very early stage. 

To achieve this they designed a genetic element that makes cell function dependent on normal TP53. If the TP53 function is interrupted, the sensor gets activated and initiates cell death. ”We treat cancer cells long after they have gone through the transformation process,” says Prof. Dr. med. Frank Buchholz describing the current situation. As a result, therapy is often too late to be able to eliminate all cancer cells in the body. Furthermore, due to additional mutations, therapy-resistant clones quickly emerge from some cancer cells.

“The TP53 sensor enables an active precocious intervention for the first time. Our results show that cells with TP53 mutations can be selectively detected and eliminated at an early stage. Hence, the transformation process is prevented.” The researchers plan to use their initial findings to develop new cancer diagnostics and to establish a protection system against cancer mutations in the long-term.



Frank Buchholz, Professor for Medical Systems Biology at the TU Dresden Faculty of Medicine Carl Gustav Carus was awarded an ERC Advanced Grant worth EUR 2.4 million for his research in the field of targeted genome surgery based on evolved site-specific recombinases. The team headed by Prof. Buchholz already succeeded in developing a designer recombinase (Brec1) that is capable of specifically removing the provirus from infected cells of most primary HIV-1 isolates found in humans. Now Frank Buchholz’ research is also focusing on various other diseases. “The generation of molecular scalpels, such as the Brec1 recombinase, will change medical practice. Not only HIV patients will likely benefit from this development, but presumably also many other patients. We are about to witness the beginning of the genome surgery era”, predicts the head of the Dresden research group, Prof. Frank Buchholz. In the funded “GenSurge” project, a “genome-editing platform” will be developed which allows efficient and safe DNA modifications without triggering cell intrinsic DNA repair.



With 37 Million HIV-positive people and more than 2 Million new infections annually, HIV remains a major world health challenge. Even though enormous advances have been made in HIV treatment, a complete cure from the disease is still not possible. Indeed, the propagation of the virus in the body can nowadays be held in check through medication, but the provirus remains present in cells of the body.

A team of researchers from the Department of Medical Systems Biology at the TUD as well as the research unit Antiviral Strategies at the HPI in Hamburg employed directed molecular evolution to generate a designer recombinase (Brec1), which can precisely remove the provirus from the majority (>90%) of clinical HIV-1 isolates found in humans.

The team now demonstrated for the first time, that the approach works on cells directly isolated from HIV-1 patients. Importantly, the antiviral effects were accomplished without measurable cytotoxic or genotoxic side effects. Based on these findings, Brec1 represents a promising candidate for possible applications in improved HIV therapies.


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