Piwil1 which binds and suppresses TE-derived piwi interfering RNAs (piRNAs) to maintain germline integrity and is associated with infertility of certain crosses in canids (Stalker et al. 2016); it is thought to be a highly-conserved gene among amniotes (Lim et al. 2013). Here, PIWIL1 is linked to Infertility.