ARG1 and bronchopulmonary dysplasia: We found that one SNP, a G to T substitution at position 4195 in the ARG1 gene (ARG1 rs2781666 SNP), was less frequent in patients with BPD and PH than in patients with BPD alone, and for each copy of the SNP minor allele (T), the odds of developing PH decreased by 43% (Trittmann et al.