Posterior microphthalmos, retinitis pigmentosa, and foveoschisis caused by a mutation in the MFRP gene: a familial study.

Abstract:

:Background: To characterize the phenotype and genotype of a rare syndrome associating posterior microphthalmos (PM), retinitis pigmentosa (RP), and foveoschisis in a consanguineous Spanish family. Methods: The study involved five family members, consisting of three siblings and their parents. All members underwent comprehensive eye examinations for best corrected visual acuity, axial length and refractive error, electroretinography (ERG), fundus photography, retinal fluorescein angiography (FA), and optical coherence tomography (OCT). Clinical exome sequencing of more than 6,000 clinically relevant genes (SureSelect Focused Exome, Agilent) was performed using the Illumina HiSeq 3000 system. Candidate variants were validated and segregated by Sanger sequencing. Results: The affected siblings had bilateral shortening of the posterior ocular segment and normal anterior segment dimensions. The fundoscopy, ERG, and FA results were compatible with RP. Macular OCT analysis revealed schisis of the outer retinal layer. Our data analysis pipeline identified a homozygous frameshift mutation in exon 5 of the membrane frizzled-related protein (MFRP) gene (c.498delC; p.Asn167Thrfs*25). Conclusion: Our study confirmed the association of PM with RP as an autosomal recessive syndrome. Although this has previously been described, it seems that there are some constant (i.e., PM and RP) and some variable features (i.e., optic nerve drusen and foveoschisis). The MFRP mutation has also been detected in other studies associating PM with RP. Analysis of a larger series of cases at the clinical and genetic levels would certainly help us to better understand the phenotype-genotype correlations of this syndrome.

journal_name

Ophthalmic Genet

journal_title

Ophthalmic genetics

authors

Morillo Sánchez MJ,Llavero Valero P,González-Del Pozo M,Ponte Zuñiga B,Antiñolo G,Ramos Jiménez M,Rodríguez De La Rúa Franch E

doi

10.1080/13816810.2019.1633547

subject

Has Abstract

pub_date

2019-06-01 00:00:00

pages

288-292

issue

3

eissn

1381-6810

issn

1744-5094

journal_volume

40

pub_type

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