Abstract:
:Nanophthalmos is a rare disorder of eye development characterized by extreme hyperopia (farsightedness), with refractive error in the range of +8.00 to +25.00 diopters. Because the cornea and lens are normal in size and shape, hyperopia occurs because insufficient growth along the visual axis places these lensing components too close to the retina. Nanophthalmic eyes show considerable thickening of both the choroidal vascular bed and scleral coat, which provide nutritive and structural support for the retina. Thickening of these tissues is a general feature of axial hyperopia, whereas the opposite occurs in myopia. We have mapped recessive nanophthalmos to a unique locus at 11q23.3 and identified four independent mutations in MFRP, a gene that is selectively expressed in the eye and encodes a protein with homology to Tolloid proteases and the Wnt-binding domain of the Frizzled transmembrane receptors. This gene is not critical for retinal function, as patients entirely lacking MFRP can still have good refraction-corrected vision, produce clinically normal electro-retinograms, and show only modest anomalies in the dark adaptation of photoreceptors. MFRP appears primarily devoted to regulating axial length of the eye. It remains to be determined whether natural variation in its activity plays a role in common refractive errors.
journal_name
Proc Natl Acad Sci U S Aauthors
Sundin OH,Leppert GS,Silva ED,Yang JM,Dharmaraj S,Maumenee IH,Santos LC,Parsa CF,Traboulsi EI,Broman KW,Dibernardo C,Sunness JS,Toy J,Weinberg EMdoi
10.1073/pnas.0501451102keywords:
subject
Has Abstractpub_date
2005-07-05 00:00:00pages
9553-8issue
27eissn
0027-8424issn
1091-6490pii
0501451102journal_volume
102pub_type
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