Degree of ATN was significantly correlated with PARP-1 expression (r coefficient = 0.810, p = 0.0001, Pearson test), with a mean expression of 2.83±0.48 in severe ATN versus 1.53±0.96 in mild cases and 0.33±0.56 in absence of ATN (p = 0.0001, one-way ANOVA test). This evidence concerns the gene PARP1 and oculocutaneous albinism type 1.