Evidence for preferential
transmission of the valine (G) allele of BDNF was found in a family-based sample of
341 white UK or Irish ADHD (Attention deficit hyperactivity disorder) probands and their parents
(odds ratio, OR=1.6, P1/40.02). A strong
paternal effect was detected (paternal transmissions: OR=3.2, P=0.0005; maternal transmissions:
OR=1.00; P=1.00) (Kent
L et al, 2005).