Frataxin deficiency and the pathology of Friedreich's Ataxia across tissues

Ercanbrack WS, Ramirez M, Dungan A, Gaul E, Ercanbrack SJ, Wingert RA. Frataxin deficiency and the pathology of Friedreich's Ataxia across tissues. Tissue Barriers. 2025 Feb 21:2462357. doi: 10.1080/21688370.2025.2462357. Epub ahead of print. PMID: 39981684. 

Most FRDA patients suffer from loss of motor control, cardiomyopathy, scoliosis, foot deformities, and diabetes. In this review, we discuss the known features of FRDA pathology and the current understanding about the basis of these alterations.

FDA Accepts New Drug Application for Vatiquinone to Treat Friedreich Ataxia

February 19, 2025​. The FDA accepted a new drug application (NDA) for vatiquinone for the treatment of children and adults with Friedreich ataxia (FA) and granted it priority review. The drug has a Prescription Drug User Fee Act target action date of August 19, 2025. 

"The results of the extension studies provide further evidence of the potential benefit of vatiquinone in slowing disease progression," Klein said in a news release.4 "In addition, the strong safety profile of vatiquinone positions it to be a potentially meaningful therapy for all Friedreich ataxia patients, particularly children and adolescents for whom there are no approved therapies.”

Frataxin Traps Low Abundance Quaternary Structure to Stimulate Human Fe-S Cluster Biosynthesis

Cory SA, Lin CW, Patra S, Havens SM, Putnam CD, Shirzadeh M, Russell DH, Barondeau DP. Frataxin Traps Low Abundance Quaternary Structure to Stimulate Human Fe-S Cluster Biosynthesis. Biochemistry. 2025 Feb 5. doi: 10.1021/acs.biochem.4c00733. Epub ahead of print. PMID: 39909887.

We propose that eukaryotic cysteine desulfurases are unusual members of the morpheein class of enzymes that control their activity through their oligomeric state. Overall, the findings support architectural switching as a regulatory mechanism linked to FXN activation of the human Fe-S cluster biosynthetic complex and provide new opportunities for therapeutic interventions of the fatal neurodegenerative disease FRDA.

Clinical Assessment of the Drug-Drug Interaction Potential of Omaveloxolone in Healthy Adult Participants

Zahir H, Murai M, Wu L, Valentine M, Hynes S. Clinical Assessment of the Drug-Drug Interaction Potential of Omaveloxolone in Healthy Adult Participants. J Clin Pharmacol. 2025 Feb 7. doi: 10.1002/jcph.6189. Epub ahead of print. PMID: 39920097. 

 It is mainly metabolized by cytochrome P450 (CYP) 3A4 in vitro. Two drug-drug interaction studies (NCT04008186 and NCT05909644) were performed to evaluate (1) the effect of drug-metabolizing enzymes (DMEs) and drug transporter (DT) modulators on the pharmacokinetics of omaveloxolone and (2) the effect of omaveloxolone on the pharmacokinetics of DME and DT substrates. Additionally, the safety of coadministering these drugs with omaveloxolone was assessed.

Neurocrine Biosciences and Voyager Therapeutics to expect IND filings in 2025

February 13, 2025. 

“We are encouraged that our novel TRACER capsids continue to perform consistently across multiple programs, and we believe they have the potential to transform gene therapy for CNS diseases. We continue to expect IND filings in 2025 for our gene therapy candidates for GBA1 and FA, and in 2026 for VY1706,” said Sandrock, Jr., in the press release

Patient involvement in clinical trials: a paradigm shift in research

Pijuan, J., Palau, F. Patient involvement in clinical trials: a paradigm shift in research. Orphanet J Rare Dis 20, 63 (2025). doi:10.1186/s13023-025-03573-y 

 Establishing universal guidelines will help ensure that all stakeholders (patients, caregivers and health professionals) can engage meaningfully in the developmental processes of healthcare initiatives. Given that health and disease affect us all, fostering collective involvement is essential for driving progress in this field.

Living with Friedreich Ataxia: Carla, Maria and Nuria

Biogen. February 11, 2025

Watch below to hear Carla, Maria and Nuria share their stories of living with FA.

 

Editorial: The mechanistic investigation and emerging therapies for Friedreich’s ataxia

Dong Y, Chandran V, Soragni E and Lynch DR (2025) Editorial: The mechanistic investigation and emerging therapies for Friedreich’s ataxia. Front. Pharmacol. 16:1560808. doi: 10.3389/fphar.2025.1560808

KosBio is a pioneering biotechnology startup: to develop an innovative treatment for Friedreich’s Ataxia (FRDA)

KosBio is a pioneering biotechnology startup, born out of a deeply personal and transformative mission: to develop an innovative treatment for Friedreich’s Ataxia (FRDA), a rare and incurable neurodegenerative disease. Our founders, intimately connected to FRDA through their own family experiences, bring a unique level of commitment and dedication to this mission, distinguishing KosBio in the competitive biotech landscape. 

 Leading our therapeutic pipeline is KB-001(TM), a therapy based on repurposing an FDA-approved drug to activate a developmental signaling pathway relevant to FRDA. This strategic approach not only expedites the path to treatment but also reduces potential risks by leveraging existing approved drugs. 

In addition, KosBio is advancing the development of a series of novel, patented drugs (KB002-KB021). These drugs are projected to have significantly greater potency than KB-001(TM), marking a substantial advancement in our therapeutic arsenal.

Functional Characterization of Parallel Fiber-Purkinje Cell Synapses in Two Friedreich's Ataxia Mouse Models

Joseph DJ, Mercado-Ayon E, Flatley L, Viaene AN, Hordeaux J, Marsh ED, Lynch DR. Functional Characterization of Parallel Fiber-Purkinje Cell Synapses in Two Friedreich's Ataxia Mouse Models. Cerebellum. 2025 Feb 5;24(2):42. doi: 10.1007/s12311-025-01796-0. PMID: 39907933; PMCID: PMC11799031.

To investigate the neural circuit basis of this dysfunction, we employed field recordings to measure Purkinje cell (PC) function and synaptic properties along with western blotting and immunohistochemistry to determine their density and structure in two established FRDA mouse models, the shRNA-frataxin (FRDAkd) and the frataxin knock in-knockout (KIKO) mice. Western blotting demonstrated subtle changes in mitochondrial proteins and only a modest reduction in the density of calbindin positive cells PCs in the cerebellar cortex of the FRDAkd mice, with no change in the density of PCs in the KIKO mice. Though PC density differed slightly in the two models, field recordings of parallel fiber-PC synapses in the molecular layer demonstrated concordant hypo-excitability of basal synaptic transmission and impairments of long-term plasticity using induction protocols associated with both potentiation and depression of synaptic strength. These results indicate that synaptic instability might be a common feature in FRDA mouse models.