Abstract:
:Usher syndrome (USH) is a genetically heterogeneous group of autosomal recessive deaf-blinding disorders. Pathophysiology leading to the blinding retinal degeneration in USH is uncertain. There is evidence for involvement of the photoreceptor cilium, photoreceptor synapse, the adjacent retinal pigment epithelium (RPE) cells, and the Crumbs protein complex, the latter implying developmental abnormalities in the retina. Testing hypotheses has been difficult in murine USH models because most do not show a retinal degeneration phenotype. We defined the retinal disease expression in vivo in human USH using optical imaging of the retina and visual function. In MYO7A (USH1B), results from young individuals or those at early stages indicated the photoreceptor was the first detectable site of disease. Later stages showed photoreceptor and RPE cell pathology. Mosaic retinas in Myo7a-deficient shaker1 mice supported the notion that the mutant photoreceptor phenotype was cell autonomous and not secondary to mutant RPE. Humans with PCDH15 (USH1F), USH2A or GPR98 (USH2C) had a similar retinal phenotype to MYO7A (USH1B). There was no evidence of photoreceptor synaptic dysfunction and no dysplastic phenotype as in CRB1 (Crumbs homologue1) retinopathy. The results point to the photoreceptor cell as the therapeutic target for USH treatment trials, such as MYO7A somatic gene replacement therapy.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Jacobson SG,Cideciyan AV,Aleman TS,Sumaroka A,Roman AJ,Gardner LM,Prosser HM,Mishra M,Bech-Hansen NT,Herrera W,Schwartz SB,Liu XZ,Kimberling WJ,Steel KP,Williams DSdoi
10.1093/hmg/ddn140subject
Has Abstractpub_date
2008-08-01 00:00:00pages
2405-15issue
15eissn
0964-6906issn
1460-2083pii
ddn140journal_volume
17pub_type
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