Innovation Programs

About the Innovation Unit
We have identified five therapeutic areas that show high potential for RNA based therapies including lung diseases, eye diseases, skin diseases, central nervous system diseases and neuromuscular diseases. We are employing our toolbox of RNA technologies to target severe genetic diseases and grow the company’s pipeline beyond cystic fibrosis, Leber’s congenital amaurosis and epidermolysis bullosa. The efforts in the innovation unit have resulted in the current pipeline.

Lung diseases

Besides our QR-010 program for cystic fibrosis (CF) caused by the F508del mutation we are working on other CFTR mutations that can potentially be treated using our RNA technologies. We could potentially target an additional 5% of the CF population with these programs.

Eye diseases

Our ophthalmology group was founded on the basis that there are several severe genetic eye disorders that currently have very limited treatment options for which RNA based therapeutics have the potential to make a large impact. The eye is a well validated target for RNA based therapies given the approved RNA therapies for the eye, their long half-lives and potential for local delivery and therefore could be an important class of drugs for ophthalmic indications in the future. Besides the program in Leber’s congenital amaurosis, QR-110, that is currently being prepared for first clinical studies we are working on programs for other ophthalmic indications including QRX-411 for Usher syndrome and QRX-504 for Fuchs endothelial corneal dystrophy (FECD).

Usher syndrome & QRX-411 and QRX-421
What is Usher syndrome?
Usher syndrome is the leading cause of combined deafness and blindness. Patients with this syndrome generally progress to a stage in which they have very limited central vision and moderate to severe deafness.

What causes Usher syndrome?
Usher syndrome type II is most commonly caused by mutations (or defects) in a gene in the DNA called the USH2A gene. In the mutations we are targeting, the genetic defect results in the lack of a functional USH2A protein. Similar to CEP290 protein that we target in our QR-110 program for Leber’s congenital amaurosis, the USH2A protein that is defective in Usher syndrome type II is responsible for the proper functioning of the light perceiving cells (rods and cones) in the retina.

The moderate to severe deafness that patients experience with Usher syndrome type II is manageable with hearing aids or cochlear implants. However, there are currently no available treatment options for the vision loss associated with this disease. Our programs will target patients with mutations in USH2A with Usher syndrome and non-syndromic retinitis pigmentosa patients which experience visual loss but do not suffer from hearing loss.

About QRX-411
With our QRX-411 program, we aim to treat the c.7595-2144A>G mutation in the USH2A gene that leads to vision loss. Our single stranded RNA oligonucleotide aims to repair the genetic defect in the RNA in the eye, such that it leads to a normal “wild-type” mRNA, which then translates into normal protein, thereby modifying the underlying disease. QRX-411 has received orphan drug designation from the U.S. Food and Drug Administration and European Medicines Agency.

About QRX-421
Our QRX-421 program targets vision loss caused by defects in a specific part of the USH2A gene called exon 13. Our single stranded RNA oligonucleotide aims to repair the genetic defect in the RNA in the eye, such that it leads to the expression of a shortened but functional protein restoration, thereby modifying the underlying disease. QRX-421 has received orphan drug designation from the U.S. Food and Drug Administration and European Medicines Agency.

Fuchs endothelial corneal dystrophy & QRX-504
What is Fuchs endothelial corneal dystrophy (FECD)?
FECD is a common inherited condition characterized by the dysfunction and degeneration of the corneal endothelium, a single cell layer on the inside of the cornea in the eye. There are different types of this disease and we focus on age-related FECD (FECD3). Some patients with age-related FECD develop advanced disease with corneal edema and corneal clouding. These symptoms can lead to complete vision loss and the need for surgery and a corneal transplant.

What causes Fuchs endothelial corneal dystrophy?
Most of age-related FECD is caused by a mutation (or defect) in the TCF4 gene.

There are currently no other treatment options for any form of FECD patients with vision loss, apart from corneal transplantation or replacement of the corneal endothelial layer. This requires surgery where the damaged cornea is removed and replaced with a healthy donor cornea. However, transplantation has several limitations, including the availability of donors, risk of rejection, the inherent risk of an invasive procedure and is only available to patients with advanced FECD.

About QRX-504
Our program, QRX-504, aims to prevent corneal dystrophy in patients with a mutation in the TCF4 gene by using a single stranded RNA oligonucleotide.

Skin diseases

Besides our QR-313 program for dystrophic epidermolysis bullosa (DEB) caused by mutations in a specific part of the COL7A1 gene, called exon 73, we are working on other DEB causing mutations that can potentially be treated using our RNA technologies.

Central Nervous System diseases

In our CNS group we are working on product candidates for several disease targets, including QRX-704 for Huntington’s disease.

Neuromuscular diseases

Within our neuromuscular group we are working on a program called QRX-604 that aims to increase Frataxin protein levels in people with Friedreich’s ataxia.

You are now leaving ProQR Therapeutics

ProQR Therapeutics provides links to web sites of other organizations in order to provide visitors with certain information. A link does not constitute an endorsement of content, viewpoint, policies, products or services of that web site. Once you link to another web site not maintained by ProQR Therapeutics, you are subject to the terms and conditions of that web site, including but not limited to its privacy policy.

You will be redirected to

Click the link above to continue or CANCEL