Bilateral congenital cataracts result from a gain-of-function mutation in the gene for aquaporin-0 in mice.

Abstract:

:Cataract Tohoku (Cat(Tohm)) is a dominant cataract mutation that leads to severe degeneration of lens fiber cells. Linkage analysis showed that the Cat(Tohm) mutation is located on mouse chromosome 10, close to the gene for aquaporin-0 (Aqp0), which encodes a membrane protein that is expressed specifically in lens fiber cells. Sequence analysis of Aqp0 revealed a 12-bp deletion without any change in the reading frame, which resulted in a deletion of four amino acids within the second transmembrane region of the AQP0 protein. Targeted expression of the mutated Aqp0 caused lens opacity in transgenic mice, the pathological severity of which depended on the expression level of the transgene. The mutated AQP0 protein was localized to the intracellular and perinuclear spaces rather than to the plasma membranes of the lens fiber cells. The cataract phenotype of Cat(Tohm) is caused by a gain-of-function mutation in the mutated AQP0 protein and not by a loss-of-function mutation.

journal_name

Genomics

journal_title

Genomics

authors

Okamura T,Miyoshi I,Takahashi K,Mototani Y,Ishigaki S,Kon Y,Kasai N

doi

10.1016/s0888-7543(03)00029-6

subject

Has Abstract

pub_date

2003-04-01 00:00:00

pages

361-8

issue

4

eissn

0888-7543

issn

1089-8646

pii

S0888754303000296

journal_volume

81

pub_type

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