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Eye disease patients to benefit from chicken study

Childhood eye disease patients could benefit from insights revealed in new chicken study.

Coloboma of the iris in a 16 year old woman
Coloboma of the iris in a 16 year old woman. © Jmarchn, Wikimedia Commons

Ocular coloboma is a disease that causes part of the eye to be missing at birth. It cannot be treated and can severely affect the patient’s vision.

A new study revealed new genes that may be responsible for the developmental errors that cause coloboma. The findings may help identify genetic defects in patients with coloboma and other birth defects.

Childhood blindness

Ocular coloboma accounts for up to 10 per cent of all childhood blindness. It can cause a distinctive keyhole-shaped pupil as it commonly results in a missing segment in the iris, the coloured part of the eye, which may extend through to the optic nerve.

Genetic causes of embryonic errors

Coloboma is the result of errors in tissue fusion – an essential process during development needed for the formation of the eye and many other organs of the developing embryo. Tissue fusion errors are a relatively common form of birth defects, however the genetic causes remain unknown for the majority of patients.

The scientists, led by Dr Joe Rainger of the Roslin Institute, used chicken embryos to study how fusion occurs and identified genes that are switched on or off during fusion – they found many of these, which also included genes already known to be essential for fusion in humans.

One of the newly identified fusion genes  Netrin-1  is likely to be critical in humans and other species as well as in organs other than the eye, which also require fusion such as the palate, the scientists found.

Identifying new genes and processes involved in tissue fusion will improve our understanding of how fusion defects occur, and whether these may be preventable. The fusion-genes we have revealed are also an excellent resource to support the identification of genetic defects in patient sequencing programmes.

Dr Joe RaingerStudy leader, Roslin Institute

The study was funded by the UK Government’s Biotechnology and Biological Sciences Research Council, Fight for Sight UK and Wellcome Trust.

** The Roslin Institute receives strategic investment funding from the Biotechnology and Biological Sciences Research Council and it is part of the University of Edinburgh’s Royal (Dick) School of Veterinary Studies. **

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