- Loss of TSLC1 causes male infertility due to a defect at the spermatid stage of spermatogenesis. van der Weyden, L., Arends, M.J., Chausiaux, O.E., Ellis, P.J., Lange, U.C., Surani, M.A., Affara, N., Murakami, Y., Adams, D.J., Bradley, A. Mol. Cell. Biol. (2006)