marfan syndrome is a genetic disorder that affects connective tissue, leading to abnormal skeletal development, lens deformities in the eyes, and heart complications. the disorder is caused by a mutation in the fbn1 gene. the following dna sequences show a section of the fbn1 gene in an unaffected individual and an individual with marfan syndrome.unaffected individual: ccg-ccg-cttindividual with marfan syndrome: cgg-ccg-ctt marfan syndrome is an autosomal dominant disorder, so the mutation that causes it is a somatican inherited mutation. according to the dna sequences shown, marfan syndrome can be caused by a mutation in the fbn1 gene. this mutation is likely a beneficialneutralharmful mutation.