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New cataract gene discovered
Date:2/14/2008

The international team of researchers was able to identify the location and defect in the coding region of the gene through analysis of genetic material (DNA) from members of a large Swiss family, the majority of whom suffered from autosomal dominant juvenile cataract. The corresponding protein belongs to a family of monocarboxylate transporters which move small molecules across cell mem-branes. Surprisingly, this genetic defect may also lead to the condition of renal glucosuria, a non-pathological kidney defect with elevated levels of glucose in the urine, but not in blood.

New research underway

The search for the molecule that is carried by this new transporter across the membrane has now begun. The researchers suspect that this genetic defect interferes with homeostasis in the lens as well as in the kidney. Since the known environmental risk factors for age-related cataract point to physiological and oxidative damages accumulating over time within the lens, the researchers assume that defects in this newly discovered transporter may also be a cause of age-related cataract. Age-related cataract patients are now being screened to find mutations in this gene. Understanding the exact function of this transporter may open new venues for non-surgical treatment of cataract.

Gradual blurred vision

Cataract, the condition of altered refractive index in the lens of the eye, is the clouding of the eyes normally clear lens and results in blurry vision that frequently includes disturbing glare in the visual field. Successful treatment today involves surgical removal of the affected lens and replacement with an artificial one.

Two conditions of cataract

Age onset of cataract is the distinguishing characteristic between affliction in childhood or in later years. Whereas about 14% of blind children are affected, half of the adult population worldwide aged 60 and ol
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Contact: Dr. Barbara Kloeckener-Gruissem
barbarkl@ethz.ch
44-079-828-1464
ETH Zurich/Swiss Federal Institute of Technology
Source:Eurekalert  

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