Genetic influences on susceptibility to oxygen-induced retinopathy.

PURPOSE To investigate the inheritance of susceptibility to oxygen-induced retinopathy in the rat with the use of formal backcross analysis. METHODS Neonatal offspring of inbred albino Fischer 344 (F344) and pigmented Dark Agouti (DA) crosses and F1xF344 and F1xDA backcrosses were exposed to alternating 24-hour cycles of hyperoxia (80% oxygen in air) and normoxia (21% oxygen in air) for 14 days. Retinal avascular area was analyzed by staining with Griffonia simplicifolia isolectin B4, a marker of vascular endothelial cells. Expression of erythropoietin (EPO) mRNA in retinas was quantified by real-time reverse-transcription polymerase chain reaction. RESULTS Oxygen-exposed offspring of two F344xDA F1 crosses showed retinal avascular areas and ocular and coat pigmentation that were similar to those of the DA strain. Mean retinal avascular area was 73%. Offspring of two DAxF1 backcrosses were similar to F344xDA F1 pups, with pigmented eyes and coats and a mean retinal avascular area of 76%. In contrast, offspring of two F344xF1 backcrosses exhibited a range of eye and coat pigmentation. Mean retinal avascular area of pigmented offspring of the F344xF1 backcrosses was 71% (P < 0.001 compared with F344 rats). Mean avascular area of albino offspring of the F344xF1 backcrosses was 27% (P > 0.05 compared with F344 rats). The normalized expression of EPO mRNA was 3.01 +/- 1.00 in retinas from pigmented F344xF1 backcross offspring compared with 1.31 +/- 0.69 for albino offspring (P < 0.001). CONCLUSIONS Segregation of the susceptibility trait to oxygen-induced retinopathy in the DA and F344 rat strains is associated with pigmentation and erythropoietin expression and can be modeled using an autosomal dominant pattern of inheritance.

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