Genotype-phenotype analysis of five families with congenital ectopia lentis accompanied with cardiovascular abnormalities

Objective

To analyze the genotype-phenotype correlation in 5 families with congenital ectopia lentis (CEL) accompanied with cardiovascular abnormal manifestation.

Methods

Detailed clinical data of 15 family members in 5 families were collected from August 2017 to March 2018 in Zhongshan Ophthalmic Center, including examination of the condition of lens before and after mydriasis by slit-lamp, evaluation of the cardiovascular system using transthoracic echocardiography, and evaluation of the degree of involvement of the subjects’ skeletal system using X-ray images.Genomic DNAs were extracted from whole blood sample of the 5 probands and 10 relatives, and screened for FBN1 mutation by targeted exome sequencing.The possible genotype-phenotype correlation was analyzed by reviewing previous literatures into these mutation sites.The study followed the principles of the Helsinki Declaration and written informed consent was obtained from each subject prior to any examination.

Results

All of the five probands were diagnosed as CEL accompanied with cardiovascular abnormal manifestation.FBN1 gene mutations were identified in all of the five probands, including four missense mutations (c.2741G>T, c.2585G>T, c.1633C>T, c.4260C>G) and one splicing mutation (c.2114-1G>C). It was predicted that all of the 5 mutations would alter the protein structure.

Conclusions

FBN1 gene has a high degree of clinical heterogeneity, and the early detection of ocular phenotypes combined with genetic screening is of great significance in the diagnosis of cardiovascular abnormalities.