Mfrp, a gene encoding a frizzled related protein, is mutated in the mouse retinal degeneration 6.

Abstract:

:The autosomal recessive mouse mutation retinal degeneration 6 (rd6) causes small, white retinal spots and progressive photoreceptor degeneration similar to that observed in human flecked retinal diseases. Using a positional cloning approach, we determined that rd6 mice carry a splice donor mutation in the mouse homolog of the human membrane-type frizzled-related protein (Mfrp) gene that results in the skipping of exon 4. We found that mRNA of Mfrp is predominantly expressed in the eye, and at a lower level in the brain. To determine where in the eye Mfrp is expressed, in situ hybridization was done and showed that Mfrp is expressed specifically in the retinal pigment epithelium (RPE) and ciliary epithelium of the eye. The deduced amino acid sequence of MFRP contains a region with similarities to the cysteine-rich domain (CRD) of frizzled, a gene originally found in Drosophila that controls tissue polarity. The CRD is essential for Wnt binding and signaling. Wnt signaling has been shown to be involved in the control of gene expression, cell adhesion, planar polarity, proliferation and apoptosis. We also observed the localization of Wnt family proteins in the apical membrane of the RPE. Our results provide genetic evidence for an involvement of the Mfrp gene expressed by RPE in the degeneration of photoreceptors.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Kameya S,Hawes NL,Chang B,Heckenlively JR,Naggert JK,Nishina PM

doi

10.1093/hmg/11.16.1879

subject

Has Abstract

pub_date

2002-08-01 00:00:00

pages

1879-86

issue

16

eissn

0964-6906

issn

1460-2083

journal_volume

11

pub_type

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