Marfan syndrome: ocular findings and novel mutations—in pursuit of genotype–phenotype associations

Abstract

ObjectiveTo analyze ocular involvement in patients diagnosed with Marfan syndrome (MFS), study their clinical findings and prognosis based on the type of FBN1 mutation, and evaluate possible genotype–phenotype correlations. DesignObservational single-centre case series. ParticipantsEleven patients diagnosed with MFS were included. All subjects met the Ghent criteria of MFS, the diagnosis was confirmed by genetic testing. MethodsAll subjects underwent a complete ophthalmologic examination. We evaluated clinical data, the incidence of ectopia lentis (EL), and other eye disorders. The association of ocular signs with the type of mutation was analyzed. ResultsFour of the 11 patients had EL, of which 3 developed secondary glaucoma, and 62.5% of the phakic patients had myopia. Other ocular abnormalities included strabismus, retinal tears, retinal detachment, and amblyopia. The encountered types of mutations were premature termination codon (PTC) in 7 patients, missense in 2 cases, 1 aberration of splicing, and 1 indel mutation. Two novel mutations were found. Of the patients with EL, 2 had a missense, 1 an indel, and 1 a nonsense mutation. ConclusionsMyopia was the most frequent ocular involvement. Patients with a PTC mutation revealed to have a smaller risk of EL; however, more studies are required to indicate the mechanism of the correlation.