Usher syndromes due to MYO7A, PCDH15, USH2A or GPR98 mutations share retinal disease mechanism.

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 Genet

journal_title

Human molecular genetics

authors

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 DS

doi

10.1093/hmg/ddn140

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

2405-15

issue

15

eissn

0964-6906

issn

1460-2083

pii

ddn140

journal_volume

17

pub_type

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