Recent developments in the diagnosis of Marfan syndrome and related disorders

• Marfan syndrome is a multisystem disorder of connective tissue that is inherited in an autosomal dominant fashion, and results from mutation of the FBN1 gene on human chromosome 15. • There are a number of conditions of the connective tissue with a similar phenotype that can be confused with Marfan syndrome. Modifications of the diagnostic criteria have recently been published, facilitating the differentiation of Marfan syndrome from these conditions. • It is still difficult to use modern genetic testing for diagnosis because Marfan syndrome can be caused by many different mutations in FBN1, a large gene with 65 coding segments, while mutations in other genes can cause overlapping phenotypes. • Several clinical trials of drug therapy, including the antihypertensive drug losartan, are in progress