Novel p.G1344E mutation in FBN1 is associated with ectopia lentis

Area of Science:

• Genetics
• Ophthalmology
• Molecular Biology

Background:

• Ectopia lentis is lens dislocation, often linked to FBN1 gene mutations affecting microfibrils.
• FBN1 mutations cause diverse clinical phenotypes, impacting the suspensory ligament of the lens.
• This study investigates a Chinese family with late-onset isolated ectopia lentis due to a novel FBN1 mutation.

Purpose of the Study:

• To characterize a Chinese dominant family with late-onset isolated ectopia lentis.
• To identify the genetic cause of ectopia lentis in this family.
• To understand genotype-phenotype correlations associated with FBN1 mutations.

Main Methods:

• Recruited eight family members, including four patients with suspected isolated ectopia lentis.
• Collected clinical data, family history, and performed ophthalmic, systemic, and echocardiographic examinations.
• Utilized whole exome sequencing and Sanger sequencing to detect pathogenic variants.

Main Results:

• Identified a novel heterozygous missense mutation (c.4031G>A/p.Gly1344Glu) in FBN1 exon 33.
• The mutation was present in all affected family members.
• Observed ocular phenotypes (ectopia lentis, microspherophakia, secondary glaucoma) and minor skeletal involvement (hallux valgus).

Conclusions:

• The novel c.4031G>A FBN1 mutation is likely pathogenic for isolated ectopia lentis.
• This study broadens the spectrum of known FBN1 mutations.
• Contributes to a better understanding of genotype-phenotype correlations in ectopia lentis.