Leopard-like retinopathy and severe early-onset portal hypertension expand the phenotype of KARS1-related syndrome: a case report

• Main Authors: Francesca Peluso, Viviana Palazzo, Giuseppe Indolfi, Francesco Mari, Roberta Pasqualetti, Elena Procopio, Claudia Nesti, Renzo Guerrini, Filippo Santorelli, Sabrina Giglio
• Format: Article
• Language: English
• Published: BMC 2021-01-01
• Series: BMC Medical Genomics
• Subjects: KARS; Mitochondrial diseases; Encephalohepatopathy; Leopard-like retinopathy; ARSs; Case report
• Online Access: https://doi.org/10.1186/s12920-020-00863-1

Abstract Background Mutations in lysyl-tRNA synthetase (KARS1), an enzyme that charges tRNA with the amino acid lysine in both the cytoplasm and mitochondria, have been associated thus far with autosomal recessive Charcot–Marie–Tooth type CMTRIB, hearing loss type DFNB89, and mitochondrial encephalohepatopathy (MEH) featuring neurodevelopmental disorders with microcephaly, white matter changes, and cardiac and hepatic failure in less than 30 patients. Case presentation We report the clinical, biochemical and molecular findings of a 14-month-old girl with severe MEH compatible clinical features, profound sensorineural hearing loss, leopard spot retinopathy, pancytopenia, and advanced liver disease with portal hypertension leading to death at the age of 30 months. Conclusions Whole exome sequencing identified two rare variants in KARS1 gene. Our report expands the allelic and clinical features of tRNA synthase disorders. Moreover, with our report we confirm the usefulness of WES as first tier diagnostic method in infants with complex multisystem phenotypes.