Epigenetic reactivation in Friedreich’s ataxia from Benzamides to gene‑Targeted chimeras

INTRODUCTION: Friedreich's ataxia (FRDA) is a prototypical repeat expansion disorder in which large intronic GAA tracts at the FXN gene locus induce heterochromatin formation, impaired transcriptional elongation, and reduced frataxin expression, driving progressive neurodegeneration and cardiomyopathy. Epigenetic therapies that restore endogenous FXN transcription have therefore emerged as a coherent disease‑modifying strategy focused on reversing repeat‑associated gene silencing at its root. AREAS COVERED: This review summarizes the evolution of frataxin (FXN) protein‑reactivating approaches from first‑generation systemic epigenetic therapies, including class I‑selective benzamide histone deacetylase inhibitors and high‑dose nicotinamide, to emerging locus‑targeted platforms such as anti‑gene oligonucleotides and Gene‑Targeted Chimera small molecules. The authors also examine splice‑modulating strategies aimed at increasing the extra‑mitochondrial FXN‑E isoform, discuss delivery and safety challenges across modalities, and highlight biomarker frameworks integrating isoform‑resolved FXN protein measurements and chromatin readouts. PubMed/MEDLINE, Embase, Web of Science, Google Scholar, plus Cochrane Library for trial reports were searched from January 1996 to June 2026. EXPERT OPINION: Early clinical programs established that FXN protein expression and chromatin marks can be pharmacologically modulated in humans but also exposed the limitations of non‑selective chromatin modulation for chronic pediatric‑onset neurodegeneration. In our view, the most promising path forward lies in repeat‑ and locus‑directed FXN reactivation, complemented by splicing‑directed modulation of FXN‑E, with rigorous attention to CNS and cardiac exposure, off‑target risk, and mechanistically anchored biomarkers.