STAG3 and Azoospermia: Lately, several genes have been identified as monogenic causes for azoospermia due to meiotic arrest (e.g., TEX11 Yatsenko et al., 2015, STAG3 Van Der Bijl et al., 2019, M1AP Wyrwoll et al., 2020 and SHOC1 Krausz et al., 2020).