Supplementary Material for: Lecithin-Cholesterol Acyltransferase (LCAT) Deficiency as a Rare Cause of Bilateral Corneal Opacities: A Case Report of a Novel Frameshift Mutation

Introduction: Lecithin–cholesterol acyltransferase (LCAT) deficiency is a rare autosomal recessive disorder of lipid metabolism characterized by corneal opacification, hemolytic anemia, and chronic kidney disease. We describe the ophthalmic, systemic, and genetic findings of a patient with LCAT deficiency and report a novel frameshift mutation in the LCAT gene. Case presentation: Ophthalmic findings may represent the first clinical sign and guide the diagnosis. A 50-year-old White male with end-stage renal disease on hemodialysis and a history of recurrent hemolytic anemia was referred for bilateral corneal opacities. Despite diffuse opacification involving all corneal layers, his best-corrected visual acuity remained 20/20 in both eyes with normal color vision, although contrast sensitivity was reduced. Laboratory testing revealed normocytic, normochromic anemia, low HDL cholesterol, and reduced apolipoprotein A levels. Genetic analysis identified compound heterozygosity in the LCAT gene: a novel frameshift variant c.580_598del p.(Ala194Serfs*64), classified as likely pathogenic, and the previously described missense variant c.619G>A p.(Gly207Ser), also classified as likely pathogenic. Conclusion: This case highlights the importance of considering metabolic disorders in the differential diagnosis of bilateral corneal opacities and expands the genetic spectrum of LCAT deficiency by reporting a novel frameshift mutation.