Arnatar Therapeutics Inc.’s ART-4, an upregulating antisense oligonucleotide (ASO) therapeutic candidate for the treatment of Alagille syndrome (ALGS), has been awarded U.S. orphan drug and rare pediatric disease designations by the FDA. Approximately 95% of ALGS cases are caused by haploinsufficient mutations in the Jagged-1 (JAG1) gene, leading to insufficient JAG1 protein levels and impaired liver bile duct development.